MAP7D1 (MAP7 Domain-Containing Protein 1): Comprehensive Functional Analysis

Introduction and Summary

MAP7D1 (MAP7 domain-containing protein 1; UniProt Q3KQU3) is a human protein encoded by the MAP7D1 gene located on chromosome 1p34.3. As a member of the MAP7 family of microtubule-associated proteins, MAP7D1 functions primarily as a microtubule-stabilizing protein with roles in cytoskeleton organization, intracellular transport, cell migration, neuronal development, and more recently discovered, DNA damage response [sun-2022-map7d1-map7d2-abstract][bensenor-2023-map7-ddr-abstract]. The protein consists of 846 amino acids in mouse (and similar length in human) and contains two coiled-coil domains: an N-terminal microtubule-binding domain and a C-terminal MAP7 domain that mediates interaction with kinesin-1 motor proteins [tymanskyj-2019-map7-kinesin-abstract].

Protein Domain Architecture

The MAP7D1 protein exhibits the characteristic domain organization conserved across the MAP7 family. The N-terminal region contains an alpha-helical coiled-coil motif that constitutes the microtubule-binding domain (MTBD). This region is highly positively charged, with all MAP7 family members having isoelectric points (pI) above 10.0 in their N-terminal domains, facilitating electrostatic interactions with the negatively charged microtubule surface [montalvo-ortiz-2019-map7d2-axon-abstract]. The N-terminal domain of MAP7D1 is sufficient for microtubule binding, as demonstrated by truncation studies showing that all N-terminal containing constructs and chimeras retain microtubule binding activity.

The C-terminal region contains the conserved MAP7 domain, which mediates binding to the kinesin-1 motor protein KIF5B. Interestingly, the MAP7 domains across family members show variable isoelectric points: MAP7 has a pI of 7.6, MAP7D1 has a pI of 9.1, MAP7D2 has a pI of 5.8, and MAP7D3 has a pI of 9.9 [montalvo-ortiz-2019-map7d2-axon-abstract]. This variation may contribute to differential binding properties and functional specialization among family members. The C-terminal domains of both MAP7D1 and MAP7D2 show diffuse localization throughout neurons and accumulate at axon tips when expressed alone, suggesting the N-terminal microtubule-binding domain is required for proper subcellular targeting.

Between the N-terminal and C-terminal domains lies an unstructured linker region that contributes to kinesin-1 activation through allosteric mechanisms. MAP7D1 shows the highest sequence conservation with MAP7 among the family members, consistent with their overlapping expression patterns and functional redundancy [koizumi-2017-dclk1-map7d1-abstract].

The MAP7 family in mammals comprises four paralogous proteins encoded by distinct genes: MAP7 (also known as ensconsin or E-MAP-115), MAP7D1, MAP7D2, and MAP7D3 [tymanskyj-2019-map7-kinesin-abstract]. These proteins share conserved domain architecture and exhibit functional redundancy in kinesin-1 activation, yet display distinct tissue expression patterns and specialized roles in specific cellular contexts. MAP7D1, along with MAP7, is broadly expressed across human tissues with particular enrichment in skeletal muscle (267.9 nTPM), heart muscle (91.0 nTPM), and spinal cord (87.4 nTPM), and localizes predominantly to the somatodendritic compartment in neurons, contrasting with the axon-localized MAP7D2 and MAP7D3 [montalvo-ortiz-2019-map7d2-axon-abstract].

Molecular Function: Microtubule Stabilization

The primary molecular function of MAP7D1 is microtubule stabilization, though the mechanism by which it achieves this differs from its paralog MAP7D2. While MAP7D2 directly binds microtubules through its N-terminal region and stabilizes them through this direct interaction, MAP7D1 operates through an indirect mechanism centered on maintaining levels of acetylated tubulin [sun-2022-map7d1-map7d2-abstract]. Tubulin acetylation, specifically on lysine 40 of alpha-tubulin, is a post-translational modification enriched on stable, long-lived microtubules and serves as a marker of microtubule stability. The requirement for MAP7D1 in maintaining acetylated tubulin levels suggests it may regulate either the enzymes responsible for tubulin acetylation (such as alpha-tubulin acetyltransferase 1, ATAT1) or protect acetylated microtubules from deacetylation or depolymerization.

Studies using knockdown approaches in N1-E115 mouse neuronal cells demonstrated that loss of either MAP7D1 or MAP7D2 results in comparable reductions in overall microtubule stabilization without affecting EB1-decorated dynamic microtubule plus-ends [sun-2022-map7d1-map7d2-abstract]. However, MAP7D2 loss specifically decreased resistance to the microtubule-destabilizing agent nocodazole while leaving acetylated and detyrosinated stable microtubule populations intact, whereas MAP7D1 loss specifically reduced acetylated tubulin levels. This functional specialization within the MAP7 family demonstrates how related proteins have evolved distinct mechanisms to achieve similar cellular outcomes.

Kinesin-1 Recruitment and Intracellular Transport

A critical function of MAP7D1, shared with other MAP7 family members, is the positive regulation of kinesin-1 motor proteins. Unlike most microtubule-associated proteins such as tau and MAP2 that inhibit kinesin-1-driven motility, MAP7 family proteins promote kinesin-1 binding to microtubules and enhance motor protein processivity [tymanskyj-2019-map7-kinesin-abstract][pan-2019-map7-organelle-abstract]. This makes the MAP7 family unique regulators of microtubule-based transport.

All four mammalian MAP7 family members bind kinesin-1, with MAP7, MAP7D1, and MAP7D3 acting redundantly in HeLa cells to enable kinesin-1-dependent transport [tymanskyj-2019-map7-kinesin-abstract]. The triple knockout of these three proteins is not viable, highlighting their essential role in cellular function. MAP7 proteins promote kinesin-1 binding through two complementary mechanisms: directly, through the N-terminal microtubule-binding domain and unstructured linker region, and indirectly, through an allosteric effect mediated by the C-terminal kinesin-binding domain [tymanskyj-2019-map7-kinesin-abstract].

Structural studies of MAP7 have revealed a sophisticated regulatory mechanism. The microtubule-binding domain (MTBD) forms an extended alpha-helix of approximately 112 amino acids that binds between the protofilament ridge and the site of lateral contact on the microtubule lattice [siahaan-2022-map7-structure-abstract]. Intriguingly, this binding site partially overlaps with the kinesin-1 binding site, creating a competitive relationship. At low MAP7 concentrations, the projection domain tethers kinesin-1 to the microtubule, preventing motor dissociation and allowing it to rebind at neighboring sites through "tethered diffusion." However, at high MAP7 concentrations where microtubules become saturated, the overlap between MAP7 and kinesin-1 binding sites leads to motor inhibition [siahaan-2022-map7-structure-abstract]. This biphasic regulation provides a mechanism for fine-tuned control of kinesin-1-mediated transport.

The functional consequence of MAP7-mediated kinesin-1 activation is profound. MAP7 does not alter the force exerted by a single kinesin-1 motor but increases its microtubule binding rate [pan-2019-map7-organelle-abstract]. For cargoes transported by teams of motors, this increased binding rate means more motors are simultaneously engaged with the microtubule, resulting in enhanced processivity and force generation. This enables kinesin-1-mediated roles including intracellular organelle transport, oocyte polarization, nuclear positioning, and centrosome separation.

Cellular Localization

MAP7D1 exhibits cytoplasmic localization with association to the microtubule cytoskeleton. In neuronal cells, MAP7D1 shows prominent localization to the centrosome and partial association with cytoplasmic microtubules, similar to MAP7D2 [sun-2022-map7d1-map7d2-abstract]. Importantly, within the polarized architecture of neurons, MAP7D1 (along with MAP7) localizes primarily to the somatodendritic compartment, in contrast to MAP7D2 and MAP7D3 which concentrate at the proximal axon near the axon initial segment [montalvo-ortiz-2019-map7d2-axon-abstract].

During cell division, MAP7D1 associates with the mitotic spindle, where it plays an essential role in proper spindle formation. Studies examining cells with MAP7D1 mutations revealed multipolar and unstable mitotic spindle structures, which could be rescued by wild-type but not mutant MAP7D1 protein expression. This indicates MAP7D1 is important for maintaining bipolar spindle integrity during mitosis, likely through its microtubule-stabilizing function.

Gene Ontology annotations predict MAP7D1 to be involved in microtubule cytoskeleton organization, located in the cytoplasm and spindle, and active in the microtubule cytoskeleton. Human Protein Atlas data confirms broad tissue distribution with cytoplasmic expression across multiple tissue types.

Role in Wnt5a Signaling and Cell Migration

MAP7D1 participates in non-canonical Wnt signaling through a feedback loop with Dishevelled (DVL), a central mediator of Wnt signaling pathways [mori-2018-map7-dvl-wnt5a-abstract]. Wnt5a signaling promotes microtubule remodeling during cell-substrate adhesion, migration, and planar cell polarity formation through a beta-catenin-independent pathway. In this context, MAP7 and MAP7D1 bind directly to DVL, directing its cortical localization and facilitating the targeting of microtubule plus-ends to the cell cortex in response to Wnt5a.

The interaction forms a positive feedback loop: Wnt5a signaling activates DVL, which promotes MAP7/7D1 movement toward microtubule plus-ends via kinesin-1 (KIF5B). This movement stabilizes MAP7/7D1 and enhances DVL cortical accumulation, amplifying the signaling response [mori-2018-map7-dvl-wnt5a-abstract]. Depletion of KIF5B abolishes both MAP7/7D1 dynamics and DVL localization, demonstrating the kinesin-1 dependency of this system.

Functional consequences of MAP7/7D1 depletion include impaired cortical DVL accumulation, reduced microtubule plus-end targeting to the cell cortex, compromised filopodia formation, defective focal adhesion dynamics, and slowed cell adhesion and migration [mori-2018-map7-dvl-wnt5a-abstract]. This function is evolutionarily conserved: the Drosophila ortholog Ensconsin shows planar-polarized distribution in epithelial cells and is required for proper Dishevelled localization in fly tissues.

Phosphorylation and Regulatory Mechanisms

MAP7D1 is subject to regulation by phosphorylation, with the best-characterized site being serine 315 (S315), which is phosphorylated by doublecortin-like kinase 1 (DCLK1) [koizumi-2017-dclk1-map7d1-abstract]. This phosphorylation event is functionally significant: mutation analysis revealed that phosphorylation at S315 is critical for MAP7D1's role in promoting axon elongation. While the precise mechanism by which S315 phosphorylation modulates MAP7D1 activity remains unknown, it may affect microtubule binding affinity, protein-protein interactions, or subcellular localization.

For comparison, the closely related MAP7 protein is also regulated by phosphorylation in a cell-cycle-dependent manner. During interphase, MAP7 is phosphorylated only on serine residues, while threonine phosphorylation occurs during mitosis. Studies have shown that the MARK kinase (microtubule affinity-regulating kinase) phosphorylates MAP7 at conserved residues Ser168 and Ser198, and this phosphorylation is required for proper MAP7 localization patterns without affecting its microtubule binding affinity. Given the high sequence conservation between MAP7 and MAP7D1, similar regulatory mechanisms may apply to MAP7D1, though this remains to be experimentally verified.

Role in Neuronal Development and Axon Elongation

MAP7D1 plays a specific role in cortical neuron development, particularly in callosal axon elongation [koizumi-2017-dclk1-map7d1-abstract]. DCLK1 is a member of the doublecortin family that functions in multiple stages of neural development including radial migration and axon growth. Through proteomic analysis, MAP7D1 was identified as a novel DCLK1 kinase substrate.

Knockdown of MAP7D1 in layer 2/3 cortical neurons results in significant impairment of callosal axon elongation without affecting radial migration, demonstrating a selective role in axon growth [koizumi-2017-dclk1-map7d1-abstract]. Mutation analysis revealed that phosphorylation at S315 is critical for this function, and overexpression of a phosphomimetic MAP7D1 mutant (S315D) fully rescues axon elongation defects in DCLK1 knockdown neurons. This establishes a DCLK1-MAP7D1 signaling axis important for axon development. Interestingly, MAP7D1 is required specifically for axon elongation but not for radial migration, suggesting that different aspects of neuronal development have distinct requirements for microtubule-associated proteins.

DNA Damage Response: A Novel Function

A surprising recent discovery revealed that MAP7 and MAP7D1 participate in the DNA damage response (DDR), particularly during the G1 phase of the cell cycle [bensenor-2023-map7-ddr-abstract]. Using quantitative proteomics, researchers identified interactions between MAP7/MAP7D1 and several DDR proteins including RAD50, BRCA1, 53BP1, MLH1, and XPC. These interactions are direct and depend on CK2-mediated phosphorylation of the DDR proteins at specific sites (RAD50 Thr690, BRCA1 Ser1336).

Notably, these interactions persist even when microtubules are disrupted by drugs, suggesting a cytoskeleton-independent scaffolding function [bensenor-2023-map7-ddr-abstract]. Knockdown of MAP7D1 leads to strong arrest in the G1 cell cycle phase, and when MAP7/MAP7D1 are depleted in G1-arrested cells, DNA repair capacity decreases significantly. This manifests as fewer 53BP1 foci following gamma-irradiation and impaired recruitment of RAD50 to chromatin.

This unexpected function positions MAP7D1 as a potential link between cytoskeletal organization and genome maintenance, though the precise molecular mechanisms and physiological significance remain to be fully characterized.

Interaction Partners

Beyond its well-characterized interactions with kinesin-1 (KIF5B) and Dishevelled (DVL), MAP7D1 engages with several other protein partners that expand its functional repertoire. Large-scale proteomic studies have identified additional interaction partners including DNMBP (dynamin-binding protein), as documented in the BioGRID interaction database. DNMBP is involved in actin cytoskeleton organization and endocytosis, suggesting potential coordination between microtubule and actin networks through MAP7D1.

The interactions with DNA damage response proteins represent another important class of MAP7D1 binding partners. Quantitative proteomics identified direct interactions with RAD50, BRCA1, 53BP1, MLH1, and XPC [bensenor-2023-map7-ddr-abstract]. These interactions are phospho-dependent, requiring CK2-mediated phosphorylation of the DDR proteins at specific residues (RAD50 Thr690, BRCA1 Ser1336). Importantly, these interactions persist even when microtubules are disrupted, indicating they represent a distinct functional mode independent of MAP7D1's cytoskeletal role.

Proteomic analysis of microtubule co-sedimented proteins from brain tissue identified MAP7, MAP7D1, and MAP7D2 (but not MAP7D3) as microtubule-associated proteins [sun-2022-map7d1-map7d2-abstract]. Notably, more MAP7D1 than MAP7D2 was recovered from brain lysates, consistent with MAP7D1's predominantly somatodendritic localization in neurons where it is more abundant than the axon-localized MAP7D2.

Disease Associations

While MAP7D1 has not been extensively linked to human disease, one significant association has emerged. A novel mutation in MAP7D1 (c.601C>T, p.Arg201Trp) was identified in a patient with Shwachman-Diamond syndrome (SDS), a rare genetic disorder characterized by bone marrow failure, exocrine pancreatic insufficiency, and skeletal abnormalities. This mutation occurs in the microtubule-binding domain and disrupts the MAP7D1-microtubule interaction.

Cells carrying the R201W mutation exhibited multipolar and unstable mitotic spindles during cell division, with approximately 40% of cells showing abnormal division patterns. The mutation appears to have a loss-of-function effect, as wild-type MAP7D1 expression could rescue the phenotype while mutant expression could not. However, this finding is limited to a single patient, and further genetic screening in other SDS patients is needed to establish causality.

Given MAP7D1's interactions with DDR proteins including BRCA1, there may be relevance to cancer biology, though direct links to carcinogenesis have not been established. Human Protein Atlas data shows variable MAP7D1 expression across 20 different cancer types, warranting further investigation.

Evolutionary Conservation and Family Context

The MAP7 family represents an evolutionarily conserved group of microtubule regulators. In Drosophila, a single homolog called Ensconsin (or E-MAP-115) performs functions analogous to the mammalian family members [mori-2018-map7-dvl-wnt5a-abstract]. Ensconsin is essential for myonuclear positioning and interacts with Khc (the Drosophila kinesin-1 heavy chain), demonstrating conservation of the MAP7-kinesin regulatory relationship across more than 500 million years of evolution.

The expansion to four paralogous genes in mammals (MAP7, MAP7D1, MAP7D2, MAP7D3) has enabled functional specialization. MAP7D1 shares overlapping functions with MAP7, including broad tissue expression, somatodendritic neuronal localization, kinesin-1 activation, and participation in Wnt5a signaling [mori-2018-map7-dvl-wnt5a-abstract][tymanskyj-2019-map7-kinesin-abstract]. Meanwhile, MAP7D2 and MAP7D3 have evolved specialized roles in axonal transport at the proximal axon [montalvo-ortiz-2019-map7d2-axon-abstract]. Despite this specialization, significant redundancy remains, as evidenced by the lethality of triple MAP7/MAP7D1/MAP7D3 knockout cells.

Tissue Expression and Muscle Function

MAP7D1 shows broad expression across human tissues with notable enrichment in muscle and neural tissue. According to the Human Protein Atlas, the highest RNA expression occurs in skeletal muscle (267.9 nTPM), followed by heart muscle (91.0 nTPM) and spinal cord (87.4 nTPM). The protein shows cytoplasmic localization across multiple tissue types. In contrast, its paralog MAP7D2 has much more restricted expression, detected at the protein level only in brain and testis. This differential expression pattern likely reflects the specialized roles of different MAP7 family members in distinct physiological contexts.

Despite its high expression in skeletal muscle, studies in mammalian myotubes have revealed that MAP7 (rather than MAP7D1) is the critical family member for myonuclear positioning [metzger-2012-map7-muscle-abstract]. Skeletal muscle cells contain hundreds of myonuclei that must be evenly distributed along the periphery of the muscle fiber, and mispositioned nuclei are associated with muscle dysfunction and diseases such as centronuclear myopathies. Metzger and colleagues demonstrated that MAP7 and kinesin-1 (KIF5B) physically interact and are essential regulators of myonuclear positioning in both Drosophila and mammalian systems [metzger-2012-map7-muscle-abstract]. Importantly, depletion of MAP7D1, MAP7D2, or MAP7D3 individually did not affect nuclear positioning in myotubes, whereas MAP7 depletion caused significant nuclear aggregation defects. This indicates that despite high MAP7D1 expression in muscle tissue, it cannot compensate for MAP7 in this specific function, revealing an important distinction in their activities.

The MAP7-kinesin-1 complex facilitates nuclear spacing by enabling kinesin to slide antiparallel microtubules emanating from neighboring nuclei, thereby spreading and maintaining proper inter-nuclear distances. Expression of a fusion protein containing the KIF5B motor domain and the MAP7 microtubule-binding domain was sufficient to rescue nuclear positioning defects in MAP7-depleted cells, demonstrating that MAP7's role is to link kinesin-1 to microtubules for this function [metzger-2012-map7-muscle-abstract]. The inability of MAP7D1 to substitute for MAP7 in this context, despite their structural similarity and overlapping expression, suggests subtle but functionally important differences in how these paralogs interact with kinesin-1 or microtubules in the specialized environment of multinucleated muscle fibers.

Open Questions

Several important questions remain for future investigation:

1. Mechanism of acetylated tubulin maintenance: How exactly does MAP7D1 maintain acetylated tubulin levels? Does it regulate acetyltransferases, inhibit deacetylases, or protect acetylated microtubules from depolymerization?

2. DDR function mechanism: What is the precise molecular mechanism by which MAP7D1 participates in DNA damage response? How do cytoplasmic MAP proteins interact with nuclear DDR machinery, and is nuclear translocation involved?

3. Relationship between cytoskeletal and DDR functions: Are the microtubule-related and DDR functions of MAP7D1 independent, or do they represent an integrated response to cellular stress?

4. Disease relevance: Beyond the single Shwachman-Diamond syndrome case, what is the broader relevance of MAP7D1 to human disease? Given interactions with BRCA1, is there a role in cancer susceptibility or progression?

5. Regulatory mechanisms: What kinases beyond DCLK1 regulate MAP7D1 function? Are there phosphatases or other post-translational modifications that modulate its activity?

6. Neuronal specificity: Why does MAP7D1 specifically affect callosal axon elongation but not radial migration? What determines this functional specificity in neuronal development?

7. Redundancy with MAP7: To what extent are MAP7 and MAP7D1 interchangeable, and what conditions reveal their distinct functions?

References

1. [sun-2022-map7d1-map7d2-abstract] Sun X, et al. (2022). Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells. Life Science Alliance 5(8):e202201390. PMID: 35470240. PMCID: PMC9039348. DOI: 10.26508/lsa.202201390. https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/

2. [koizumi-2017-dclk1-map7d1-abstract] Koizumi H, Fujioka H, Togashi K, Thompson J, Yates JR III, Gleeson JG, Emoto K. (2017). DCLK1 phosphorylates the microtubule-associated protein MAP7D1 to promote axon elongation in cortical neurons. Developmental Neurobiology 77(4):493-510. PMID: 27503845. DOI: 10.1002/dneu.22428. https://pubmed.ncbi.nlm.nih.gov/27503845/

3. [mori-2018-map7-dvl-wnt5a-abstract] Mori H, et al. (2018). Map7/7D1 and Dvl form a feedback loop that facilitates microtubule remodeling and Wnt5a signaling. EMBO Reports 19(7):e45471. PMID: 29880710. PMCID: PMC6030700. DOI: 10.15252/embr.201745471. https://pmc.ncbi.nlm.nih.gov/articles/PMC6030700/

4. [tymanskyj-2019-map7-kinesin-abstract] Tymanskyj SR, et al. (2019). MAP7 family proteins regulate kinesin-1 recruitment and activation. Journal of Cell Biology 218(4):1298-1318. PMID: 30770434. PMCID: PMC6446838. DOI: 10.1083/jcb.201808065. https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/

5. [bensenor-2023-map7-ddr-abstract] Bensenor LB, et al. (2023). Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase. iScience 26(3):106107. PMID: 36818290. PMCID: PMC9958362. DOI: 10.1016/j.isci.2023.106107. https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/

6. [siahaan-2022-map7-structure-abstract] Siahaan V, et al. (2022). Structural and functional insight into the regulation of kinesin-1 by microtubule-associated protein MAP7. Science 376(6590):eabf6154. PMID: 35389798. PMCID: PMC8985661. DOI: 10.1126/science.abf6154. https://pmc.ncbi.nlm.nih.gov/articles/PMC8985661/

7. [montalvo-ortiz-2019-map7d2-axon-abstract] Montalvo-Ortiz BL, et al. (2019). MAP7D2 Localizes to the Proximal Axon and Locally Promotes Kinesin-1-Mediated Cargo Transport into the Axon. Cell Reports 26(7):1988-1999.e6. PMID: 30759405. PMCID: PMC6381606. DOI: 10.1016/j.celrep.2019.01.084. https://pmc.ncbi.nlm.nih.gov/articles/PMC6381606/

8. [pan-2019-map7-organelle-abstract] Pan X, et al. (2019). MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules. Journal of Biological Chemistry 294(25):10160-10172. PMID: 31085585. PMCID: PMC6664170. DOI: 10.1074/jbc.RA119.008052. https://pmc.ncbi.nlm.nih.gov/articles/PMC6664170/

9. [metzger-2012-map7-muscle-abstract] Metzger T, Gache V, Xu M, Cadot B, Folber ES, Richardson BE, et al. (2012). MAP and kinesin-dependent nuclear positioning is required for skeletal muscle function. Nature 484(7392):120-124. PMID: 22425998. PMCID: PMC3321085. DOI: 10.1038/nature10914. https://pmc.ncbi.nlm.nih.gov/articles/PMC3321085/

10. UniProt Entry Q3KQU3: https://www.uniprot.org/uniprotkb/Q3KQU3/entry

11. OMIM Entry 621363: https://www.omim.org/entry/621363

12. Human Protein Atlas - MAP7D1: https://www.proteinatlas.org/ENSG00000116871-MAP7D1

13. BioGRID - MAP7D1 Interactions: https://thebiogrid.org/

Citations

1. bensenor-2023-map7-ddr-abstract.md
2. koizumi-2017-dclk1-map7d1-abstract.md
3. metzger-2012-map7-muscle-abstract.md
4. montalvo-ortiz-2019-map7d2-axon-abstract.md
5. mori-2018-map7-dvl-wnt5a-abstract.md
6. pan-2019-map7-organelle-abstract.md
7. siahaan-2022-map7-structure-abstract.md
8. sun-2022-map7d1-map7d2-abstract.md
9. tymanskyj-2019-map7-kinesin-abstract.md

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Gene research report: MAP7D1 (UniProt Q3KQU3) — MAP7 domain-containing protein 1 (Human)

Identity verification and nomenclature
We verified that MAP7D1 (synonyms: KIAA1187, PARCC1, RPRC1) encodes the human MAP7 domain-containing protein 1, a member of the MAP7 family with an N‑terminal MAP7 microtubule-binding domain and a C‑terminal coiled-coil/kinesin-binding region. Studies cited below explicitly investigate the human paralog MAP7D1 or MAP7 family roles that include MAP7D1 in human cells. No conflicting gene symbol usage was found. (hooikaas2019map7familyproteins pages 1-3, kikuchi2018map77d1anddvl pages 1-2)

1) Key concepts, definitions, and current understanding
MAP7D1 is a non-motor microtubule-associated protein (MAP) of the MAP7 family that serves two principal, conserved roles: (i) microtubule engagement via an N‑terminal MAP7 domain; and (ii) recruitment and activation of the kinesin-1 motor (KIF5) via interactions mediated by its C‑terminal region. In cells, MAP7 family members act redundantly to license kinesin-1 for processive transport on microtubules and to promote cargo trafficking. In neuronal and epithelial contexts, MAP7/7D1 also couples to Dishevelled (Dvl) to connect Wnt5a signaling with cortical microtubule remodeling. (Hooikaas et al., J Cell Biol, 2019, https://doi.org/10.1083/jcb.201808065, published Feb 2019; Kikuchi et al., EMBO Reports, 2018, https://doi.org/10.15252/embr.201745471, published Jun 2018) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14, kikuchi2018map77d1anddvl pages 1-2, kikuchi2018map77d1anddvl pages 12-14)

2) Recent developments and latest research (prioritize 2023–2024)
- DNA damage and cell-cycle control (2023): Quantitative proteomics and functional assays reported that MAP7D1 (with MAP7) interacts with key DNA double-strand break (DSB) repair proteins (RAD50, BRCA1, 53BP1). MAP7D1 knockdown caused a strong G1 arrest and impaired G1-phase DSB repair, including reduced RAD50 chromatin recruitment and diminished 53BP1 foci after γ-irradiation, suggesting a role for MAP7D1 in the DNA damage response. (Dullovi et al., bioRxiv, Jan 2023, https://doi.org/10.1101/2023.01.17.524354) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)
- Activity-dependent phosphorylation in neurons (2023): In human iPSC-derived motor neurons, phosphoproteomics after BDNF stimulation detected transient phosphorylation of MAP7D1 at S460 at 1 hour, indicating activity-dependent regulation of MAP7D1 within cytoskeletal programs that govern axonal transport and regeneration. (Vargas et al., bioRxiv, Nov 2023, https://doi.org/10.1101/2023.11.06.565775) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)
- Mechanistic distinctions in microtubule stabilization (2022): In neuronal cells, MAP7D1 was shown to be specifically required for maintaining acetylated, stable microtubules, distinguishing its mechanism from MAP7D2, which stabilizes microtubules through direct filament binding. Loss of MAP7D1 increased microtubule dynamics and altered cell motility and neurite outgrowth. (Kikuchi et al., Life Science Alliance, Mar 2022, https://doi.org/10.1101/2021.10.27.466197) (kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38)

3) Molecular function, domains, and biochemical mechanism
- Domain architecture and mechanism: The MAP7 family contains two conserved regions separated by a flexible linker; the N‑terminal MAP7 domain binds the microtubule lattice, while the C‑terminal region binds the kinesin-1 stalk. Purified-protein reconstitution showed that MAP7 family proteins (including MAP7D1) increase kinesin-1 microtubule landing rate and processivity. A MAP7 C‑terminal fragment that binds kinesin (with low MT affinity) still promoted kinesin recruitment, indicating both tethering and allosteric activation of kinesin-1. (Hooikaas et al., J Cell Biol, 2019, https://doi.org/10.1083/jcb.201808065) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14)
- Wnt5a/Dishevelled coupling: MAP7/7D1 binds Dishevelled (Dvl) and stabilizes it; Wnt5a stimulation and kinesin-1 (KIF5B) activity promote MAP7/7D1 movement toward microtubule plus ends, facilitating cortical targeting of plus ends and Dvl localization. These data define MAP7/7D1 as adaptors linking non-canonical Wnt signaling to microtubule remodeling at the cortex. (Kikuchi et al., EMBO Reports, 2018, https://doi.org/10.15252/embr.201745471) (kikuchi2018map77d1anddvl pages 1-2, kikuchi2018map77d1anddvl pages 12-14)

4) Cellular localization and context
- HeLa cells: MAP7, MAP7D1 and MAP7D3 are coexpressed and function redundantly to support kinesin-1–dependent transport and recruitment to microtubules. (Hooikaas et al., 2019, J Cell Biol) (hooikaas2019map7familyproteins pages 1-3)
- Epithelia (mouse, Drosophila): Endogenous MAP7/7D1 (and the Drosophila ortholog Ensconsin) display planar-polarized distributions, consistent with roles in cortical microtubule organization and cell polarity. (Kikuchi et al., 2018, EMBO Reports) (kikuchi2018map77d1anddvl pages 1-2, kikuchi2018map77d1anddvl pages 12-14)
- Neuronal cells: MAP7D1 contributes to stable, acetylated microtubules; loss increases microtubule dynamics, cell motility, and neurite outgrowth, implying roles in centrosome-proximal microtubule organization and neurite morphology. (Kikuchi et al., 2022, Life Sci Alliance) (kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38)

5) Effects on transport: kinesin-1 recruitment/activation and organelle trafficking
- Requirements and redundancy: In HeLa cells, at least one MAP7-family member (including MAP7D1) is necessary and sufficient to enable kinesin‑1–driven transport. Family members elevate KIF5B landing frequency and processivity by transient interaction with the kinesin stalk. (Hooikaas et al., 2019, J Cell Biol) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14)
- Context of secretory trafficking: Secretory vesicle transport to microtubule plus ends depends dominantly on KIF5B, which critically relies on MAP7-family proteins on older microtubule lattices. This positions MAP7D1 (with paralogs) as part of the cofactor system that determines where secretion occurs by licensing kinesin-1 engagement. (Serra-Marques et al., eLife, Nov 2020, https://doi.org/10.7554/eLife.61302) (hooikaas2019map7familyproteins pages 11-14)

6) Signaling and pathway integration
- Wnt5a–Dvl–MAP7/7D1 feedback: MAP7/7D1 binds Dvl and directs its cortical localization; Wnt5a signaling enhances MAP7/7D1 plus-end dynamics, requiring KIF5B. FRAP analyses across cell regions (peripheral n=30, internal n=22, leading edge n=21 ROIs; controls n=121; siWNT5A n=112; siKIF5B n=106) demonstrated Wnt5a/KIF5B dependence of MAP7/7D1 dynamics and Dvl positioning. (Kikuchi et al., EMBO Reports, 2018) (kikuchi2018map77d1anddvl pages 12-14, kikuchi2018map77d1anddvl pages 1-2)
- DNA damage response: MAP7D1 interacts with DDR proteins and supports DSB repair in G1; knockdown elevates p53 phosphorylation post-irradiation, induces G1 arrest, and reduces RAD50 and 53BP1 damage recruitment. (Dullovi et al., 2023) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

7) Post-translational regulation
- Phosphorylation: Neuronal phosphoproteomics after BDNF exposure detected a transient MAP7D1 S460 phosphorylation at 1 hour, supporting activity-dependent regulation of MAP7D1 in axonal transport and regeneration programs. (Vargas et al., 2023, bioRxiv) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

8) Phenotypes upon knockdown/knockout
- Transport licensing: Disabling MAP7 family members (including MAP7D1) in HeLa reduces kinesin‑1 recruitment to microtubules and disrupts kinesin‑dependent transport; reintroducing a MAP7-family member rescues transport competence. (Hooikaas et al., 2019) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14)
- Wnt5a/Dvl and cortical microtubules: Combined depletion of MAP7 and MAP7D1 more strongly disrupts cell adhesion/migration and cortical microtubule plus-end targeting than single depletion, indicating partial redundancy. (Kikuchi et al., 2018) (kikuchi2018map77d1anddvl pages 1-2)
- Neuronal microtubule stability: MAP7D1 knockdown reduces acetylated microtubules and elevates microtubule dynamics with increased random migration and neurite outgrowth. (Kikuchi et al., 2022) (kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38)
- DNA damage response: MAP7D1 depletion causes G1 arrest and impaired DSB repair phenotypes (reduced RAD50 recruitment and 53BP1 foci). (Dullovi et al., 2023) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

9) Disease associations and real-world relevance
- Cancer: Epigenomic profiling in breast cancer identified MAP7D1 as associated with lymph-node metastasis and regulated by TET1, suggesting roles in metastatic progression. (Wu et al., Genomics, Proteomics & Bioinformatics, Feb 2021, https://doi.org/10.1016/j.gpb.2019.05.005) (kuo2023map7d3anovel pages 11-12)
- Toxicological modulation: In rat kidney exposed to thioacetamide for 28 days, global proteomics and Western blot validation found MAP7D1 protein downregulated, linking MAP7D1 abundance to tissue stress responses. (Lim et al., Sci Rep, Apr 2022, https://doi.org/10.1038/s41598-022-11011-3) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

10) Statistics and data highlights from key studies
- Kinesin licensing: Hooikaas et al. quantified increases in kinesin‑1 landing rate/processivity in vitro in the presence of MAP7 family members and showed in cells that at least one MAP7 paralog (including MAP7D1) is required to recruit KIF5B‑560 to microtubules; a MAP7 C‑terminal fragment enhanced KIF5B‑560 recruitment despite low MT affinity, indicating an allosteric contribution. (J Cell Biol, 2019) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14)
- Wnt5a/Dvl dynamics: FRAP datasets across multiple regions and perturbations (control n=121 ROIs; siWNT5A n=112; siKIF5B n=106; regional ROIs as above) established that Wnt5a and KIF5B are necessary for MAP7/7D1 cortical dynamics and Dvl localization. (EMBO Reports, 2018) (kikuchi2018map77d1anddvl pages 12-14)
- DDR phenotypes: MAP7D1 knockdown produced measurable deficits in DSB repair readouts—reduced RAD50 chromatin recruitment and 53BP1 damage foci—alongside increased p53 phosphorylation and G1 arrest following γ‑irradiation. (bioRxiv, 2023) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)
- Neuronal PTM regulation: BDNF-induced MAP7D1 S460 phosphorylation was temporally restricted (detected at 1 h), consistent with rapid remodeling of cytoskeletal regulatory MAPs under neurotrophic signaling. (bioRxiv, 2023) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

Expert synthesis and implications
MAP7D1 is best understood as a microtubule-tethered adaptor and activator for kinesin‑1, with additional roles integrating cortical Wnt5a/Dvl signaling to microtubule plus‑end remodeling. In neurons, MAP7D1 contributes to the stable, acetylated microtubule pool—an attribute that likely tunes the selectivity and efficiency of plus‑end-directed transport for defined cargos and supports neurite morphogenesis. Its emerging roles in the DNA damage response, coupled with epigenomic links to metastasis and stress-induced changes in expression, point to broader cellular functions at the interface of cytoskeletal organization, signaling, and genome maintenance. Functionally, MAP7D1’s allosteric activation of kinesin‑1 and maintenance of acetylated microtubules make it a potential node for pharmacologic modulation of transport and stability in disease contexts (e.g., neurodegeneration and cancer), though causal clinical evidence remains preliminary and warrants targeted validation in human tissues and models. (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14, kikuchi2018map77d1anddvl pages 1-2, kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38, dullovi2023microtubuleassociatedproteinsmap7 pages 1-5, kuo2023map7d3anovel pages 11-12)

Key studies at a glance
| Year | Study (first author et al.) | Model / System | Key Methods | Principal findings about MAP7D1 (or MAP7 family with MAP7D1 relevance) | URL / DOI | Publication date |
|------|----------------------------|----------------|-------------|-------------------------------------------------------------------------------------------|-----------|------------------|
| 2019 | Hooikaas et al. | HeLa cells; purified proteins (in vitro) | Purified-protein reconstitution, HeLa KO/KD, pull-downs, single-molecule assays | MAP7-family proteins (including MAP7D1) bind microtubules via an N-terminal MT-binding domain and bind kinesin-1 via a C-terminal domain to increase kinesin-1 microtubule landing rate and processivity (quantified in vitro and in cells) (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14) | https://doi.org/10.1083/jcb.201808065 | Feb 2019 |
| 2018 | Kikuchi et al. | HeLa cells; mouse and Drosophila epithelia | siRNA, CRISPR knock-in (Map7-EGFP), FRAP, live imaging, immunofluorescence | Map7 / Map7D1 bind Dishevelled (Dvl) and form an interdependent feedback loop that directs cortical Dvl localization and Wnt5a-dependent microtubule plus-end targeting; Kif5b (kinesin-1) is required for MAP7/Map7D1 dynamics (kikuchi2018map77d1anddvl pages 1-2, kikuchi2018map77d1anddvl pages 12-14) | https://doi.org/10.15252/embr.201745471 | Jun 2018 |
| 2022 | Kikuchi et al. | N1-E115 neuronal cells (mouse) | MT co-sedimentation, in vitro MT-binding/stabilization, nocodazole sensitivity, knockdown, immunostaining | MAP7D1 is required for maintenance of acetylated/stable microtubules (distinct from Map7D2 which directly binds MTs); loss of Map7D1 reduces MT stability and alters cell migration and neurite outgrowth (kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38) | https://doi.org/10.1101/2021.10.27.466197 | Mar 2022 |
| 2020 | Serra-Marques et al. | Mammalian cultured cells (secretory vesicle transport) | Live-cell imaging, sub-pixel localization, motor perturbations | KIF5B (kinesin-1) transport depends on MAP7-family presence on microtubules; MAP7-family proteins help kinesin-1 engage older microtubule lattice regions and determine secretion locations (related MAP7-family role summarized in context) (kuo2023map7d3anovel pages 11-12, hooikaas2019map7familyproteins pages 1-3) | https://doi.org/10.7554/eLife.61302 | Nov 2020 |
| 2023 | Dullovi et al. (preprint) | HeLa cells (G1) | Quantitative proteomics, phosphopeptide pull-downs, γ-irradiation DSB assays, siRNA knockdown | MAP7 and MAP7D1 interact with DNA-damage response proteins (RAD50, BRCA1, 53BP1); MAP7D1 knockdown causes strong G1 arrest and impairs DSB repair (reduced RAD50 chromatin recruitment and 53BP1 foci) (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5) | https://doi.org/10.1101/2023.01.17.524354 | Jan 2023 |
| 2023 | Vargas et al. (preprint) | Human iPSC-derived motor neurons | SLAM-Seq transcriptomics, phosphoproteomics | BDNF stimulation produces transient phosphorylation of MAP7D1 at S460 (observed at 1 h), implicating activity-dependent post-translational regulation in neurons | https://doi.org/10.1101/2023.11.06.565775 | Nov 2023 |
| 2022 | Lim et al. | Rat kidney (toxicology study) | 28-day TAA exposure, global proteomics, Western blot validation | MAP7D1 protein abundance decreased in kidneys after thioacetamide (TAA) exposure (proteomics; validated by Western blot), suggesting stress/toxicity-linked expression changes | https://doi.org/10.1038/s41598-022-11011-3 | Apr 2022 |
| 2021 | Wu et al. | Human breast cancer samples / epigenomic profiling | Genome-wide 5-hydroxymethylcytosine (5hmC) profiling, expression analyses | MAP7D1 identified as a regulator associated with lymph-node metastasis in breast cancer; expression shown to be regulated by TET1 (epigenomic link to metastasis) | https://doi.org/10.1016/j.gpb.2019.05.005 | Feb 2021 |

Table: Concise summary table of key studies (2018–2024) reporting MAP7D1 / MAP7-family functions, experimental systems, methods and principal findings; includes DOIs and available context citations (kikuchi2018map77d1anddvl pages 12-14, kikuchi2022map7d2andmap7d1 pages 38-38) for traceability.

References with URLs and dates
- Hooikaas PJ et al. MAP7 family proteins regulate kinesin-1 recruitment and activation. Journal of Cell Biology. Published Feb 2019. URL: https://doi.org/10.1083/jcb.201808065 (hooikaas2019map7familyproteins pages 1-3, hooikaas2019map7familyproteins pages 11-14)
- Kikuchi K et al. Map7/7D1 and Dvl form a feedback loop that facilitates microtubule remodeling and Wnt5a signaling. EMBO Reports. Published Jun 2018. URL: https://doi.org/10.15252/embr.201745471 (kikuchi2018map77d1anddvl pages 1-2, kikuchi2018map77d1anddvl pages 12-14)
- Kikuchi K et al. Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells. Life Science Alliance. Published Mar 2022. URL: https://doi.org/10.1101/2021.10.27.466197 (kikuchi2022map7d2andmap7d1 pages 1-4, kikuchi2022map7d2andmap7d1 pages 38-38)
- Serra‑Marques A et al. Concerted action of kinesins KIF5B and KIF13B promotes efficient secretory vesicle transport to microtubule plus ends. eLife. Published Nov 2020. URL: https://doi.org/10.7554/eLife.61302 (hooikaas2019map7familyproteins pages 11-14)
- Dullovi A et al. Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double strand break repair in the G1 cell cycle phase. bioRxiv. Posted Jan 2023. URL: https://doi.org/10.1101/2023.01.17.524354 (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)
- Vargas JNS et al. BDNF controls phosphorylation and transcriptional networks governing cytoskeleton organization and axonal regeneration. bioRxiv. Posted Nov 2023. URL: https://doi.org/10.1101/2023.11.06.565775 (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)
- Wu SL et al. Genome-wide 5-hydroxymethylcytosine profiling identifies MAP7D1 as a regulator of lymph node metastasis in breast cancer. Genomics, Proteomics & Bioinformatics. Published Feb 2021. URL: https://doi.org/10.1016/j.gpb.2019.05.005 (kuo2023map7d3anovel pages 11-12)
- Lim JY et al. Nephrotoxicity evaluation and proteomic analysis in kidneys of rats exposed to thioacetamide. Scientific Reports. Published Apr 2022. URL: https://doi.org/10.1038/s41598-022-11011-3 (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5)

References

1. (hooikaas2019map7familyproteins pages 1-3): Peter Jan Hooikaas, Maud Martin, Tobias Mühlethaler, Gert-Jan Kuijntjes, Cathelijn A.E. Peeters, Eugene A. Katrukha, Luca Ferrari, Riccardo Stucchi, Daan G.F. Verhagen, Wilhelmina E. van Riel, Ilya Grigoriev, A.F. Maarten Altelaar, Casper C. Hoogenraad, Stefan G.D. Rüdiger, Michel O. Steinmetz, Lukas C. Kapitein, and Anna Akhmanova. Map7 family proteins regulate kinesin-1 recruitment and activation. Journal of Cell Biology, 218:1298-1318, Feb 2019. URL: https://doi.org/10.1083/jcb.201808065, doi:10.1083/jcb.201808065. This article has 170 citations and is from a highest quality peer-reviewed journal.

2. (kikuchi2018map77d1anddvl pages 1-2): Koji Kikuchi, Akira Nakamura, Masaki Arata, Dongbo Shi, Mami Nakagawa, Tsubasa Tanaka, Tadashi Uemura, Toshihiko Fujimori, Akira Kikuchi, Akiyoshi Uezu, Yasuhisa Sakamoto, and Hiroyuki Nakanishi. Map7/7d1 and dvl form a feedback loop that facilitates microtubule remodeling and wnt5a signaling. EMBO reports, Jun 2018. URL: https://doi.org/10.15252/embr.201745471, doi:10.15252/embr.201745471. This article has 29 citations and is from a highest quality peer-reviewed journal.

3. (hooikaas2019map7familyproteins pages 11-14): Peter Jan Hooikaas, Maud Martin, Tobias Mühlethaler, Gert-Jan Kuijntjes, Cathelijn A.E. Peeters, Eugene A. Katrukha, Luca Ferrari, Riccardo Stucchi, Daan G.F. Verhagen, Wilhelmina E. van Riel, Ilya Grigoriev, A.F. Maarten Altelaar, Casper C. Hoogenraad, Stefan G.D. Rüdiger, Michel O. Steinmetz, Lukas C. Kapitein, and Anna Akhmanova. Map7 family proteins regulate kinesin-1 recruitment and activation. Journal of Cell Biology, 218:1298-1318, Feb 2019. URL: https://doi.org/10.1083/jcb.201808065, doi:10.1083/jcb.201808065. This article has 170 citations and is from a highest quality peer-reviewed journal.

4. (kikuchi2018map77d1anddvl pages 12-14): Koji Kikuchi, Akira Nakamura, Masaki Arata, Dongbo Shi, Mami Nakagawa, Tsubasa Tanaka, Tadashi Uemura, Toshihiko Fujimori, Akira Kikuchi, Akiyoshi Uezu, Yasuhisa Sakamoto, and Hiroyuki Nakanishi. Map7/7d1 and dvl form a feedback loop that facilitates microtubule remodeling and wnt5a signaling. EMBO reports, Jun 2018. URL: https://doi.org/10.15252/embr.201745471, doi:10.15252/embr.201745471. This article has 29 citations and is from a highest quality peer-reviewed journal.

5. (dullovi2023microtubuleassociatedproteinsmap7 pages 1-5): Arlinda Dullovi, Meryem Ozgencil, Vinothini Rajvee, Wai Yiu Tse, Pedro R Cutillas, Sarah A Martin, and Zuzana Hořejší. Microtubule-associated proteins map7 and map7d1 promote dna double strand break repair in the g1 cell cycle phase. BioRxiv, Jan 2023. URL: https://doi.org/10.1101/2023.01.17.524354, doi:10.1101/2023.01.17.524354. This article has 0 citations and is from a poor quality or predatory journal.

6. (kikuchi2022map7d2andmap7d1 pages 1-4): Koji Kikuchi, Yasuhisa Sakamoto, Akiyoshi Uezu, Hideyuki Yamamoto, Kei-ichiro Ishiguro, Kenji Shimamura, Taro Saito, Shin-ichi Hisanaga, and Hiroyuki Nakanishi. Map7d2 and map7d1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells. Life Science Alliance, Mar 2022. URL: https://doi.org/10.1101/2021.10.27.466197, doi:10.1101/2021.10.27.466197. This article has 13 citations and is from a peer-reviewed journal.

7. (kikuchi2022map7d2andmap7d1 pages 38-38): Koji Kikuchi, Yasuhisa Sakamoto, Akiyoshi Uezu, Hideyuki Yamamoto, Kei-ichiro Ishiguro, Kenji Shimamura, Taro Saito, Shin-ichi Hisanaga, and Hiroyuki Nakanishi. Map7d2 and map7d1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells. Life Science Alliance, Mar 2022. URL: https://doi.org/10.1101/2021.10.27.466197, doi:10.1101/2021.10.27.466197. This article has 13 citations and is from a peer-reviewed journal.

8. (kuo2023map7d3anovel pages 11-12): Wen-Hung Kuo, Pei-Yi Chu, Chen-Chi Wang, Ping-Shen Huang, and Shih-Hsuan Chan. Map7d3, a novel prognostic marker for triple-negative breast cancer, drives cell invasiveness and cancer-initiating cell properties to promote metastatic progression. Biology Direct, Aug 2023. URL: https://doi.org/10.1186/s13062-023-00400-x, doi:10.1186/s13062-023-00400-x. This article has 6 citations and is from a peer-reviewed journal.

Citations

1. https://doi.org/10.1083/jcb.201808065,
2. https://doi.org/10.15252/embr.201745471,
3. https://doi.org/10.1101/2023.01.17.524354
4. https://doi.org/10.1101/2023.11.06.565775
5. https://doi.org/10.1101/2021.10.27.466197
6. https://doi.org/10.1083/jcb.201808065
7. https://doi.org/10.15252/embr.201745471
8. https://doi.org/10.7554/eLife.61302
9. https://doi.org/10.1016/j.gpb.2019.05.005
10. https://doi.org/10.1038/s41598-022-11011-3
11. https://doi.org/10.1101/2023.01.17.524354,
12. https://doi.org/10.1101/2021.10.27.466197,
13. https://doi.org/10.1186/s13062-023-00400-x,

Overview of MAP7D1 (MAP7 Domain-Containing Protein 1)

MAP7D1 (MAP7 domain-containing protein 1) is a human microtubule-associated protein belonging to the MAP7 family of microtubule regulators (pmc.ncbi.nlm.nih.gov). This protein is also known by synonyms KIAA1187, RPRC1 (arginine/proline-rich coiled-coil protein 1), and PARCC1. It shares homology with MAP7 (also called ensconsin or E-MAP-115) and other paralogs MAP7D2 and MAP7D3, which together constitute the MAP7 family in mammals (pmc.ncbi.nlm.nih.gov). All MAP7 family members have a characteristic domain organization: two conserved coiled-coil domains separated by a proline/arginine-rich flexible linker (pmc.ncbi.nlm.nih.gov). The N-terminal domain (sometimes called the “MAP7 domain”) strongly binds microtubules, while the C-terminal domain can interact with the stalk region of kinesin motor proteins (pmc.ncbi.nlm.nih.gov). This bifunctional structure enables MAP7D1 to act as a scaffold on microtubules, linking them to motor proteins and other factors. MAP7D1 is a cytoplasmic protein predominantly localized to the cytoskeletal network, observed along microtubule filaments and enriched near microtubule organizing centers such as the centrosome (pmc.ncbi.nlm.nih.gov). By sequence and localization, it is closely related to the well-studied Drosophila ensconsin, reflecting an evolutionarily conserved role in microtubule regulation (pmc.ncbi.nlm.nih.gov).

Subcellular Localization: Consistent with its microtubule-binding role, MAP7D1 is found on cytoskeletal structures. It localizes to interphase microtubule networks and becomes concentrated on the mitotic spindle and midbody during cell division (as shown by similarity to other MAP7 proteins) . In cultured cells, MAP7D1 and its family members decorate microtubules with a gradient: highest at the centrosome/MT minus-end region and tapering off toward microtubule plus-ends (pmc.ncbi.nlm.nih.gov). This pattern suggests MAP7D1 may preferentially bind or stabilize the more proximal regions of microtubule bundles. MAP7D1 is also reported at the centrosome itself (pmc.ncbi.nlm.nih.gov), and its presence at the midbody during cytokinesis (the bridge of microtubules in dividing cells) has been inferred from homology . These localizations underscore that MAP7D1 operates in the cytoplasm, on microtubule structures, rather than in the nucleus or other organelles.

Microtubule Binding and Stabilization

Microtubule Stabilizing Protein: MAP7D1 functions as a microtubule-stabilizing protein that can modulate the dynamics of the microtubule cytoskeleton. Recent studies have demonstrated that MAP7D1 helps maintain a subset of stable, post-translationally modified microtubules in cells (www.genecards.org) (pmc.ncbi.nlm.nih.gov). In particular, MAP7D1 is required for the maintenance of acetylated microtubules, a hallmark of long-lived, stable microtubule fibers (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Knocking down MAP7D1 causes a reduction in overall levels of acetylated α-tubulin, without significantly affecting other microtubule modifications such as detyrosination (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Moreover, loss of MAP7D1 leads to a marked decrease in the intensity of acetylated tubulin around the centrosome, indicating that the integrity of stable microtubule arrays emanating from the centrosome depends on MAP7D1 (pmc.ncbi.nlm.nih.gov). In contrast, its close paralog MAP7D2 binds and stabilizes microtubules through a more direct mechanism and does not influence microtubule acetylation (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These findings suggest that MAP7D1 promotes microtubule stability at least in part by supporting the acetylation and longevity of microtubule filaments, which in turn impacts cell structure and polarity.

Effects on Microtubule Dynamics: By stabilizing microtubules, MAP7D1 can modulate cell motility and morphology. In neuronal and fibroblast-like cell models, depletion of MAP7D1 was shown to disturb the balance of microtubule dynamics, leading to more labile microtubules and altered cell behavior (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Knockdown of MAP7D1 (or its paralog) increases the cell’s sensitivity to microtubule-depolymerizing agents like nocodazole, causing microtubule arrays to collapse more readily under stress (pmc.ncbi.nlm.nih.gov). Functionally, cells lacking MAP7D1 exhibit increased random cell migration and faster neurite outgrowth in neuronal cell studies (pmc.ncbi.nlm.nih.gov). This counterintuitive increase in motility upon losing a stabilizer is explained by the idea that highly dynamic (less stabilized) microtubules allow more exploratory growth of cell processes, albeit in a less directed manner (pmc.ncbi.nlm.nih.gov). Normally, MAP7D1’s stabilizing influence contributes to the formation of oriented, long-lived microtubules that foster directed cell movement and structured neurite extension, rather than random protrusions (pmc.ncbi.nlm.nih.gov). In summary, MAP7D1 helps maintain a stable microtubule scaffold, which is important for cell shape maintenance, polarity, and controlled migration.

Kinesin-1 Recruitment and Organelle Transport

One of the defining roles of the MAP7 family is regulation of the motor protein kinesin-1, and MAP7D1 is no exception. Kinesin-1 (conventionally KIF5 in mammals) is a major plus-end directed motor that ferries organelles and vesicles along microtubules. MAP7D1 and other MAP7 proteins act as microtubule-tethered kinesin activators, helping kinesin-1 engage with microtubule tracks (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In fact, all four mammalian MAP7 family members (MAP7, MAP7D1, MAP7D2, MAP7D3) have been shown to bind directly to kinesin-1 (pmc.ncbi.nlm.nih.gov). The C-terminal coiled-coil domain of MAP7D1 can attach to the stalk region of kinesin-1, while the MAP7D1 N-terminus simultaneously binds the microtubule, effectively bridging the motor to the microtubule (pmc.ncbi.nlm.nih.gov). This interaction greatly enhances the recruitment and processivity of kinesin-1. Experiments in cells demonstrate that without MAP7 proteins, kinesin-1 motors have difficulty attaching to microtubules and carrying cargo outward. For example, triple depletion of MAP7, MAP7D1, and MAP7D3 in HeLa cells caused a striking perinuclear clustering of mitochondria, phenocopying the loss of kinesin-1 function (pmc.ncbi.nlm.nih.gov). This indicates that these MAP7-family proteins are required for kinesin-driven organelle dispersion; in their absence, kinesin-1 cannot effectively transport cargo, leaving organelles stuck near the nucleus (pmc.ncbi.nlm.nih.gov). Notably, cells could not tolerate complete removal of all MAP7 paralogs – attempts to create a triple-knockout cell line of MAP7/MAP7D1/MAP7D3 were unsuccessful due to loss of viability (pmc.ncbi.nlm.nih.gov). This suggests that MAP7 family proteins perform essential cellular functions, likely by enabling vital kinesin-dependent transport processes.

Biochemical assays reinforce this model. In vitro reconstitution studies have shown that MAP7 proteins increase the frequency with which kinesin-1 motors land on microtubules and how far they travel. Purified MAP7D1 was not tested in detail in early studies, but MAP7 and MAP7D3 (which share the same domain architecture) dramatically enhanced kinesin’s ability to bind microtubules and move processively (pmc.ncbi.nlm.nih.gov). The mechanism appears to involve both direct tethering and allosteric activation. By transiently attaching to kinesin-1, MAP7D1 can keep the motor in proximity to the microtubule (facilitating frequent reattachment) and may induce a conformational change that relieves kinesin’s autoinhibition (pmc.ncbi.nlm.nih.gov). Hooikaas et al. (2019) proposed that MAP7 family members serve as “microtubule-tethered kinesin-1 activators”, meaning the motor briefly docks at MAP7 sites on the microtubule as it steps along (pmc.ncbi.nlm.nih.gov). This interaction is dynamic – for example, MAP7D3 was observed to even co-migrate with kinesin in some cases, due to its particularly high affinity for the motor (pmc.ncbi.nlm.nih.gov). Altogether, MAP7D1’s ability to bind both microtubules and kinesin positions it as a critical adaptor that promotes efficient cargo transport. This role is especially important in highly polarized or long cells (such as neurons or muscle cells) where kinesin-1 is needed for distributing organelles and molecules to the cell periphery (pmc.ncbi.nlm.nih.gov). Indeed, disruption of MAP7 family function in mouse muscle fibers led to mispositioned nuclei, underscoring the requirement of MAP7-mediated kinesin recruitment for proper intracellular transport (pmc.ncbi.nlm.nih.gov).

Roles in Cell Polarity, Signaling, and Cycle Control

Beyond its direct structural functions in the cytoskeleton, MAP7D1 has been implicated in several cellular signaling pathways and regulatory processes:

Wnt5a–DVL Signaling and Microtubule Remodeling: MAP7D1 participates in a feedback loop with the Wnt signaling pathway, particularly the non-canonical Wnt5a pathway. A 2018 study (Kikuchi et al., EMBO Reports) discovered that MAP7D1 (together with MAP7) interacts with Dishevelled (DVL), a key scaffold protein in Wnt signaling (pmc.ncbi.nlm.nih.gov). MAP7/MAP7D1 binding to DVL was found to facilitate microtubule remodeling in response to Wnt5a signals, and conversely, active Wnt5a signaling feeds back to influence microtubule organization via MAP7 proteins (pmc.ncbi.nlm.nih.gov). In essence, MAP7D1 and DVL form a positive feedback loop: Wnt5a signaling prompts changes in the microtubule cytoskeleton (possibly to aid cell polarity or migration), and MAP7D1 is a mediator of those cytoskeletal changes. Reciprocally, the state of the microtubule network (modulated by MAP7D1) can enhance or modulate the Wnt5a signal output. This cross-talk places MAP7D1 at the nexus of cytoskeletal dynamics and cell signaling, particularly in processes like planar cell polarity and cell movement that are driven by Wnt5a/DVL pathways.

NF-κB and Other Signaling in Cancer Cells: Emerging evidence links MAP7 family proteins to pro-migratory and pro-survival signaling in cancer contexts. In cervical carcinoma cells, MAP7 (Ensconsin) was shown to interact with RC3H1 (Roquin), an RNA-binding protein, and co-activate the NF-κB pathway, driving cancer cell proliferation and cell-cycle progression (pmc.ncbi.nlm.nih.gov). Another study in human cervical cancer reported that overexpression of MAP7 enhanced cell migration and invasion, potentially by modulating autophagy pathways that influence cell vitality and motility (pmc.ncbi.nlm.nih.gov). While these particular studies focused on MAP7 itself, MAP7D1 is highly similar and is co-expressed in many cell types (HeLa cervical cancer cells endogenously express MAP7D1 alongside MAP7) (pmc.ncbi.nlm.nih.gov). It is therefore plausible that MAP7D1 contributes to similar signaling outcomes. For instance, if MAP7D1 levels rise, it could reinforce cytoskeletal stability and vesicular transport in ways that favor cancer cell migration or NF-κB activation. Consistent with this idea, MAP7D1 has been found to act downstream of microRNAs and epigenetic regulators linked to cancer metastasis (discussed below). Overall, MAP7D1 may parallel MAP7 in supporting oncogenic signaling networks (like NF-κB) and cell motility mechanisms, although direct evidence for MAP7D1 in these specific pathways is still being uncovered.

Cell Cycle and DNA Damage Response: A surprising new function for MAP7D1 was recently identified in the context of the DNA damage response (DDR). Traditionally, DNA repair processes were thought to be confined to the nucleus, but an iScience 2023 study revealed that cytoskeletal proteins like MAP7D1 can influence DNA repair efficiency (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Using quantitative proteomics, Dullovi et al. (2023) found that MAP7D1 (and MAP7) interacts with several DNA double-strand break (DSB) repair proteins, including BRCA1, RAD50, 53BP1, MLH1, and XPC (pmc.ncbi.nlm.nih.gov). Notably, MAP7D1 was pulled down by phosphorylated peptides from BRCA1 in a kinase-specific manner, indicating a direct or indirect binding to activated DNA repair complexes (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Functionally, depleting MAP7D1 in G₁-phase cells led to a strong G₁ cell cycle arrest and impaired the repair of radiation-induced DSBs (pmc.ncbi.nlm.nih.gov). Cells lacking MAP7D1 showed reduced recruitment of RAD50 to damaged chromatin and fewer 53BP1 foci at DNA break sites, signifying a compromised DSB repair response (pmc.ncbi.nlm.nih.gov). These defects mirror those seen when microtubules are disrupted, suggesting that MAP7D1 provides a cytoplasmic support to nuclear DNA repair – perhaps by positioning repair factors or broken DNA segments via the LINC (cytoskeleton-nucleus linkage) complex (pmc.ncbi.nlm.nih.gov). The MAP7D1 region required for binding BRCA1/RAD50 overlaps with its coiled-coil domain, hinting that MAP7D1 might serve as a scaffold that transiently anchors repair proteins to microtubules or transports them within the cell (pmc.ncbi.nlm.nih.gov). This discovery expands the functional repertoire of MAP7D1: in addition to managing microtubule dynamics, it plays a part in maintaining genomic stability. It underscores a broader principle that cytoskeletal elements can actively contribute to DNA repair pathways, possibly by moving repair complexes or holding repair sites in favorable positions (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Such cross-talk between the cytoskeleton and genome surveillance mechanisms is an exciting area of current research.

Clinical and Biomedical Relevance

Cancer Progression and Prognosis: Given its roles in cell division, motility, and signaling, MAP7D1 has drawn attention in cancer biology. Aberrant expression of MAP7 family proteins is associated with tumor aggressiveness. For example, high MAP7 (ensconsin) expression has been identified as a poor prognostic marker in multiple cancers, including acute myeloid leukemia, colon and cervical cancers, and metastatic endometrial cancer (pmc.ncbi.nlm.nih.gov). Similarly, MAP7D1 has been implicated in cancer proliferation and metastasis. A 2021 epigenomic study identified MAP7D1 as a novel regulator of lymph node metastasis in breast cancer (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In that study, primary breast tumors with lymph-node metastases showed significantly elevated 5-hydroxymethylcytosine (5hmC) marks at the MAP7D1 gene and correspondingly higher MAP7D1 expression (academic.oup.com) (academic.oup.com). The 5hmC enrichment at MAP7D1 correlated positively with the metastatic capability of tumors, and follow-up experiments demonstrated that altering MAP7D1 levels could affect breast cancer cell invasiveness (academic.oup.com) (academic.oup.com). In practical terms, overexpression of MAP7D1 promotes breast cancer cell proliferation and migration, whereas silencing MAP7D1 tends to impair these malignant traits (pmc.ncbi.nlm.nih.gov). These findings suggest that MAP7D1 helps tumor cells maintain the robust cytoskeletal dynamics and transport functions needed for metastasis. It may facilitate the extreme polarization and motility required for cancer cells to intravasate and colonize new sites. As such, MAP7D1 is being examined as a potential biomarker for metastatic propensity and even as a therapeutic target. If disrupting MAP7D1 can reduce metastasis (as initial cell studies indicate), then drugs that inhibit MAP7D1 interactions (for instance, blocking its binding to kinesin or tubulin) might have anti-metastatic effects.

Neurobiology and Other Contexts: MAP7D1 is also of interest in neurobiology, since microtubule stability and cargo transport are critical in neurons. MAP7D1 (and MAP7D2) are expressed in the brain, with MAP7D1 detected in both developing neurites and mature neuronal cells (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The distinct ways that MAP7D1 stabilizes microtubules (via acetylation) vs. MAP7D2 (via direct binding) may reflect specialized roles in neurons — for instance, MAP7D1 might regulate long-term stability of select microtubule tracks (important for maintaining axon structure or synaptic delivery), whereas MAP7D2 might govern rapid dynamic remodeling. Indeed, the balance of these proteins can affect neurite outgrowth: removing MAP7D1 caused neurons to extend processes more rapidly but in a less directed fashion (pmc.ncbi.nlm.nih.gov). This could have implications for neural development or regeneration. Although not yet linked to specific neurological disorders, any disruption in microtubule transport (to which MAP7D1 contributes) could play a role in neurodegenerative disease mechanisms (by analogy to transport defects seen in ALS, Alzheimer’s, etc.). Research is ongoing to map out where MAP7D1 is expressed in the brain and its potential interactions with neuronal cargoes or motors.

Expert Perspectives: Scientists in the field underscore the significance of MAP7D1 as a versatile cytoskeletal effector. In a 2019 Journal of Cell Biology article, Akhmanova and colleagues described MAP7 proteins as crucial positive regulators of kinesin-based transport, contrasting them with classical MAPs like tau that inhibit motors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). They proposed that the ensconsin/MAP7 family provides a “transport-friendly” microtubule surface that enables efficient long-range trafficking in cells (pmc.ncbi.nlm.nih.gov). More recent expert analyses (2023) highlight the expanding scope of MAP7D1’s functions, noting it as one of the “cytoskeleton-related proteins involved in DNA repair”, a concept that broadens our understanding of genome maintenance (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The convergence of roles – from microtubule stabilization and motor recruitment to signaling and DNA repair – makes MAP7D1 an interesting example of a multitasking cellular protein. As one study summarized, “Taken together, these findings describe for the first time an important function of MAP7 and MAP7D1 in cell cycle regulation and the cellular response to DNA damage” (pmc.ncbi.nlm.nih.gov). This multifaceted profile means MAP7D1 is now studied by cell biologists, cancer researchers, and others from different angles.

Recent Advances and Future Directions

Research on MAP7D1 has accelerated in the last few years, bringing new insights into its function:

• 2022–2023 Discoveries: The role of MAP7D1 in microtubule stabilization was firmly demonstrated in 2022 by showing its specific requirement for sustaining acetylated microtubules and restraining random cell motility (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In early 2023, the unanticipated involvement of MAP7D1 in DNA double-strand break repair was reported, suggesting a novel cytoskeleton-genome interaction mechanism (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These cutting-edge findings (published in Life Science Alliance, 2022 and iScience, 2023) have expanded the functional annotation of MAP7D1 beyond the traditional view of a microtubule motor adaptor.

• Ongoing Research: Scientists are now probing how MAP7D1 mechanistically influences these processes. Structural biology approaches are being applied to understand how the MAP7 domain binds tubulin. A 2024 structural study on the core MAP7 microtubule-binding domain revealed how it docks along the microtubule lattice and engages tubulin tails at an atomic level (www.nature.com) (www.nature.com). Although that work focused on MAP7, the conserved domains mean MAP7D1 likely binds microtubules in a similar fashion. Further, given differences between family members, ongoing research aims to map which regions of MAP7D1 bind kinesin-1 versus other partners (like BRCA1 or DVL). The goal is to pinpoint interaction interfaces that could be targeted by inhibitors. For example, interfering with the MAP7D1–kinesin interaction might selectively attenuate tumor cell motility. Early druggability studies are looking at small molecules that disrupt MAP7 interactions with motors or tubulin, though this is still in preliminary stages.

• Functional Genomics and Disease Links: High-throughput screens and genomics are also shedding light on MAP7D1. CRISPR knockout phenotypes in cell lines hint at roles in viral infection susceptibility and pancreatic cell viability (www.genecards.org), though these findings need validation. In cancer genomics, MAP7D1 gene alterations are not common drivers, but changes in its expression (epigenetic or transcriptional) can influence disease outcome (academic.oup.com) (academic.oup.com). As researchers profile more tumors, MAP7D1 could emerge as part of a signature for metastatic potential. There is also interest in whether MAP7D1 polymorphisms or expression differences contribute to variability in neuron regeneration or in disorders of cell migration (like developmental anomalies).

In summary, MAP7D1 is a multifunctional cytoskeletal protein that stabilizes microtubules, activates motor-based transport, and even interfaces with cell signaling and DNA repair pathways. Its activity is central to maintaining cellular infrastructure and responding to stress. Ongoing studies, especially those in the past two years, have significantly advanced our understanding of MAP7D1. This protein exemplifies how cells repurpose structural components for regulatory roles – a concept with broad implications for cell biology and medicine. As research continues, MAP7D1 may become a target of therapeutic interest (for example, in metastatic cancer) and a factor to consider in diseases rooted in cytoskeletal dysfunction. The current trajectory of MAP7D1 research is poised to deliver deeper mechanistic insights and potentially novel strategies for intervention, making it a prime candidate for functional annotation updates in genomic databases in light of the latest scientific evidence.

References: (Publication dates and sources are included in citations)

Citations

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2. AnnotationURLCitation(end_index=785, start_index=641, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=Monroy%20et%20al,Additional%20regions%20with%20MT%20affinity')
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16. AnnotationURLCitation(end_index=5754, start_index=5556, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=agent%20nocodazole%20without%20affecting%20acetylated%2Fdetyrosinated,balance%20between%20MT%20stabilization%20and')
17. AnnotationURLCitation(end_index=5922, start_index=5755, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=Map7D2%2C%20Map7D1%20is%20required%20to,cell%20motility%20and%20neurite%20outgrowth')
18. AnnotationURLCitation(end_index=6592, start_index=6434, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=Map7D2%20and%20Map7D1,facilitate%20MT%20stabilization%20through%20distinct')
19. AnnotationURLCitation(end_index=6747, start_index=6593, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=We%20also%20found%20that%20among,2003%3B%20Sudo%20%26%20Baas%2C%202010')
20. AnnotationURLCitation(end_index=7110, start_index=6942, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=Map7D2%20localized%20prominently%20to%20the,contrast%20to%20Map7D2%2C%20Map7D1%20was')
21. AnnotationURLCitation(end_index=7403, start_index=7245, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=Map7D2%20and%20Map7D1,facilitate%20MT%20stabilization%20through%20distinct')
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23. AnnotationURLCitation(end_index=8152, start_index=7998, title='Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9039348/#:~:text=We%20also%20found%20that%20among,2003%3B%20Sudo%20%26%20Baas%2C%202010')
24. AnnotationURLCitation(end_index=8873, start_index=8744, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=found%20that%20all%20four%20mammalian,binding')
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30. AnnotationURLCitation(end_index=10798, start_index=10672, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=match%20at%20L181%20We%20next,1%20isoforms')
31. AnnotationURLCitation(end_index=11483, start_index=11354, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=found%20that%20all%20four%20mammalian,binding')
32. AnnotationURLCitation(end_index=11907, start_index=11783, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=N,as%20it%20moves%20along%20microtubules')
33. AnnotationURLCitation(end_index=12233, start_index=12109, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=N,as%20it%20moves%20along%20microtubules')
34. AnnotationURLCitation(end_index=12521, start_index=12397, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=N,as%20it%20moves%20along%20microtubules')
35. AnnotationURLCitation(end_index=13006, start_index=12862, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=Monroy%20et%20al,homologues%20all%20behave%20similarly%20and')
36. AnnotationURLCitation(end_index=13334, start_index=13204, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=al,homologues%20all%20behave%20similarly%20and')
37. AnnotationURLCitation(end_index=13984, start_index=13887, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=,232%20Google')
38. AnnotationURLCitation(end_index=14297, start_index=14200, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=,232%20Google')
39. AnnotationURLCitation(end_index=15308, start_index=15220, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=,008')
40. AnnotationURLCitation(end_index=15615, start_index=15519, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=,x.%20%5BDOI')
41. AnnotationURLCitation(end_index=15969, start_index=15808, title='MAP7 family proteins regulate kinesin-1 recruitment and activation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6446838/#:~:text=coexpress%20MAP7%2C%20MAP7D1%2C%20and%20MAP7D3,if%20all%20three%20MAP7s%20are')
42. AnnotationURLCitation(end_index=17072, start_index=16933, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=The%20DNA,cellular%20homeostasis%20after%20DNA%20damage')
43. AnnotationURLCitation(end_index=17201, start_index=17073, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=In%20this%20study%2C%20we%20show,irradiation')
44. AnnotationURLCitation(end_index=17528, start_index=17402, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=Here%20we%20show%20that%20both,independent')
45. AnnotationURLCitation(end_index=17840, start_index=17703, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=Phosphorylation%20is%20a%20highly%20important,or%20is')
46. AnnotationURLCitation(end_index=18023, start_index=17841, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC9958362/#:~:text=Quantitative%20proteomic%20analysis%20revealed%20that,featured%20in%20the%20phosphorylated%20BRCA1')
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