Ensconsin (MAP7): Microtubule-Associated Protein 7 in Human OpenAI o3-deep-research-2025-06-26 148 citations 2025-12-27T20:29:50.792962

Ensconsin (MAP7): Microtubule-Associated Protein 7 in Human

Identification and Overview

MAP7 (Microtubule-Associated Protein 7), also known as Ensconsin or E-MAP-115 (epithelial MAP of 115 kDa), is a human microtubule-binding protein predominantly expressed in epithelial cells (pubmed.ncbi.nlm.nih.gov). It was first identified in the early 1990s by Masson and Kreis (1993) in HeLa cells as a novel protein tightly associated with microtubules (pmc.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). Unlike other MAPs of similar size, MAP7’s binding to microtubules is “nucleotide-insensitive,” meaning it remains attached regardless of the tubulin’s nucleotide state (pubmed.ncbi.nlm.nih.gov). The name Ensconsin (from “ensconce,” to secure firmly) reflects its tenacious microtubule association (pmc.ncbi.nlm.nih.gov). Human MAP7 is ~750 amino acids in length (~115 kDa) and is the founding member of the MAP7 family (with paralogs MAP7D1, MAP7D2, MAP7D3 in mammals). It plays a multifaceted role in organizing the microtubule cytoskeleton and linking it to intracellular transport processes (pmc.ncbi.nlm.nih.gov).

Basic Function: MAP7 is principally a microtubule-stabilizing protein that binds directly to microtubule filaments and modulates their dynamics (pubmed.ncbi.nlm.nih.gov). Early studies showed that overexpression of MAP7’s N-terminal domain in cells could render microtubules resistant to the depolymerizing drug nocodazole, demonstrating its potent stabilizing effect (pubmed.ncbi.nlm.nih.gov). In epithelial cells (such as Caco-2 and MDCK), MAP7 expression increases as cells polarize and differentiate, suggesting it is important for organizing stable microtubule arrays during the establishment of cell polarity (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). Consistently, MAP7 is abundant in highly differentiated, polarized epithelial cells (e.g. intestinal absorptive cells, kidney tubule cells), and its levels correlate with the degree of apicobasal polarity (pubmed.ncbi.nlm.nih.gov). In developing mouse tissues, Map7 (E-MAP-115) is expressed from mid-embryogenesis onward in many epithelia and some neurons, peaking as cells mature and polarize (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). These patterns suggest a fundamental role for MAP7 in organizing microtubules to support specialized cell architecture and intracellular organization. Indeed, the unique in vivo distribution of MAP7 led researchers to propose it is crucial for microtubule reorganization during epithelial differentiation and polarization (pubmed.ncbi.nlm.nih.gov).

Structural Features and Localization

Domain Architecture: MAP7 contains an N-terminal microtubule-binding domain (MTBD) and a C-terminal region implicated in binding motor proteins. The MT-binding domain is roughly 100–120 amino acids long (residues ~59–170) and is highly conserved (www.nature.com). Structural studies (NMR and cryo-EM in 2023-2024) reveal that this MTBD forms a long α-helix with a short hinge and binds along the microtubule lattice, engaging multiple tubulin subunits including tubulin C-terminal tails (www.nature.com) (www.nature.com). This extended binding interface underpins MAP7’s strong attachment and its ability to stabilize microtubules: the MTBD can “lock” onto protofilaments and even promote tubulin polymerization under conditions where microtubules would not normally form (www.nature.com) (www.nature.com). Notably, adding the purified MAP7 MTBD to tubulin in vitro induces microtubule assembly and bundling, indicating that this domain alone is sufficient to nucleate and stabilize microtubules (www.nature.com). Beyond the MTBD, MAP7’s C-terminal region is largely coiled-coil and contains a kinesin-1 interaction domain (as shown by co-immunoprecipitation and truncation analyses (pmc.ncbi.nlm.nih.gov)). This allows MAP7 to serve as a scaffold, binding microtubules via its N-terminus and motor proteins via its C-terminus, effectively linking microtubule tracks to motors.

Subcellular Localization: Under interphase conditions, MAP7 decorates the microtubule lattice, particularly on more stable microtubule subsets. In cultured cells like HeLa, E-MAP-115 was observed to associate preferentially with perinuclear microtubules (pubmed.ncbi.nlm.nih.gov) – the region around the centrosome/Golgi where microtubules are often long-lived and post-translationally modified. Recent imaging in human bronchial epithelial cells (BEAS-2B) similarly found MAP7 enriched on perinuclear microtubules, whereas another MAP (MAP4) uniformly coated all microtubules (pmc.ncbi.nlm.nih.gov). Intriguingly, MAP7 colocalizes strongly with acetylated tubulin – a hallmark of stable, long-lived microtubules (pmc.ncbi.nlm.nih.gov). This supports that MAP7 associates dynamically with the subset of microtubules that are stabilized and involved in maintaining cell structure. In polarized epithelial monolayers (e.g. Caco-2 forming domes/blisters), MAP7 levels and microtubule binding increase as the cells establish apical junctions (pubmed.ncbi.nlm.nih.gov), hinting that MAP7 may help anchor microtubules to these specialized structures (possibly facilitating intercellular contact formation (www.genecards.org)).

During cell division, MAP7’s localization is tightly regulated. It is largely absent from microtubules in early prophase, when many MAPs are released (pmc.ncbi.nlm.nih.gov). However, as cells progress to metaphase, MAP7 becomes concentrated at the spindle poles and then spreads to coat the mitotic spindle microtubules (pmc.ncbi.nlm.nih.gov). By telophase, it decorates the spindle midzone. This dynamic redistribution is controlled by phosphorylation: MAP7 is hyper-phosphorylated in mitotic cells, which transiently reduces its microtubule binding affinity (pmc.ncbi.nlm.nih.gov). Indeed, in mitotic extracts, hyper-phosphorylated MAP7 remains in the supernatant (unbound) unless dephosphorylated (pmc.ncbi.nlm.nih.gov). As specific cell-cycle kinases become active or inactive, MAP7 gets dephosphorylated at spindle poles and re-binds microtubules later in mitosis (pmc.ncbi.nlm.nih.gov). This regulated binding ensures that MAP7 engages the spindle at the correct time, potentially to assist in spindle stabilization and chromosome segregation. In support of that role, experiments in Drosophila neural stem cells showed that Ensconsin/MAP7 promotes robust spindle microtubule growth and proper centrosome separation during mitosis (pmc.ncbi.nlm.nih.gov). Thus, MAP7’s localization is dynamic – cytoskeletal association is controlled spatially and temporally by signaling events, allowing MAP7 to function where and when it’s needed.

Regulation: Multiple kinases regulate MAP7. For example, the MARK/Par-1 kinase phosphorylates MAP7 at several serine sites (including Ser168 and Ser198, conserved in mammals) (pmc.ncbi.nlm.nih.gov). In Drosophila oocytes, Par-1-dependent phosphorylation restricts MAP7’s localization to the anterior of the oocyte, helping establish cell polarity (pmc.ncbi.nlm.nih.gov). Mutating those phosphorylation sites causes MAP7 to mis-localize (no longer anteriorly confined), although its basic microtubule-binding ability remains intact (pmc.ncbi.nlm.nih.gov). This indicates phosphorylation primarily modulates MAP7’s distribution rather than turning binding on/off. In summary, MAP7 is a cytosolic protein associating with microtubule networks (and in rare contexts it can appear in the nucleus – see below), with its localization fine-tuned by post-translational modifications and possibly protein partners.

Role in Microtubule Stabilization and Dynamics

MAP7’s foremost function is to stabilize and organize microtubules. As a lattice-binding protein, it can suppress microtubule dynamic instability and promote polymerization. The original characterization concluded MAP7 “is a microtubule-stabilizing protein” (pubmed.ncbi.nlm.nih.gov): cells engineered to overexpress MAP7’s MT-binding fragment maintained microtubules even after nocodazole exposure, a clear sign that MAP7 can protect microtubules from disassembly (pubmed.ncbi.nlm.nih.gov). Mechanistically, MAP7 binds along the tubulin protofilaments and can “bridge” adjacent tubulin dimers, which likely reinforces lateral and longitudinal tubulin contacts (www.nature.com) (www.nature.com). Cryo-EM studies (Nature Communications, 2024) have visualized how the MAP7 MTBD lies in the microtubule inner groove and interacts with tubulin tails, effectively locking the lattice in a polymerized state (www.nature.com) (www.nature.com). This structural stabilization is so robust that adding the MAP7 MTBD can induce microtubule assembly at tubulin concentrations normally too low for polymerization (www.nature.com). Furthermore, at high MAP7:tubulin ratios, it causes formation of unusually thick polymers (possibly multiple microtubule protofilament sheets) (www.nature.com), underscoring its potent polymerization effect.

Consistent with these biochemical effects, MAP7 is associated with stable microtubule populations in cells. Many of these microtubules carry specific tubulin post-translational modifications (PTMs) linked to stability, notably acetylation and detyrosination. A recent Developmental Cell study (Shen & Ori-McKenney, 2024) revealed that MAP7 actively promotes tubulin acetylation and concurrently prevents tubulin detyrosination, thereby sculpting the “tubulin code” on microtubules (pmc.ncbi.nlm.nih.gov). MAP7 binding allosterically makes the microtubule lattice a better substrate for αTAT1 (α-tubulin acetyltransferase), increasing α-tubulin Lys40 acetylation, and sterically hinders the enzyme vasohibin/SVBP that would normally remove the C-terminal tyrosine from tubulin (pmc.ncbi.nlm.nih.gov). Through these actions, MAP7 ensures microtubules bear modifications that correlate with stability and longevity. Under hyperosmotic stress (which causes cytoplasm to become crowded), cells sharply increase MAP7 association on microtubules and raise acetylation levels ~3-4 fold, presumably to stabilize the network in the face of stress (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). If MAP7 is depleted, acetylation levels drop and microtubules instead become more detyrosinated (a state that can indicate older microtubules but in this context was linked to instability) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These findings identify MAP7 as a key factor that remodels the microtubule cytoskeleton in response to cellular conditions, enhancing stability when needed for adaptation (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Biologically, stabilizing select microtubule subsets is crucial in processes like cell polarization, differentiation, and migration. MAP7 appears to fulfill this role in epithelial tissues: as noted, its expression and localization correlate with cells transitioning to a polarized, differentiated state (pubmed.ncbi.nlm.nih.gov). For example, in developing kidney and intestinal epithelia, cells start expressing high MAP7 only when they mature and form organized structures, and cells that lose polarity (like maturing podocytes) no longer express MAP7 (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This suggests MAP7 helps build the stable microtubule tracks required for transporting proteins and organelles to specific domains (apical vs basolateral) during differentiation. It may also participate in strengthening cell–cell junctions: one report indicates MAP7 co-localizes with the TRPV4 channel at the cell cortex and may help recruit TRPV4 to the membrane (www.genecards.org), hinting at a role in linking microtubules to membrane complexes. Additionally, during neuronal development, MAP7’s stabilizing influence is linked to axon outgrowth. Neurons often extend long, stable microtubule bundles in axons, and MAP7 is upregulated during the formation of axonal branches. In dorsal root ganglion neurons, increased MAP7 expression precedes collateral branch formation, and experimentally overexpressing MAP7 leads to a significant increase in the number of axon branches formed (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This indicates MAP7-mediated microtubule stabilization can drive the structural changes needed for new neurite outgrowth. Conversely, loss of MAP7 (or its close homologs) in neurons results in fewer branches or stunted axons (pmc.ncbi.nlm.nih.gov). Overall, by stabilizing microtubule arrays, MAP7 provides a structural scaffold essential for cell polarity, differentiation, and morphological plasticity.

Interactions with Motor Proteins and Transport

One of MAP7’s most unique functions is serving as an adapter between microtubules and motor proteins, particularly kinesin motors. MAP7 has been shown to bind the kinesin-1 family (KIF5) via its C-terminal domain, and in doing so, it can recruit and activate kinesin on microtubule tracks (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In Drosophila, Ensconsin (MAP7) is an essential co-factor for kinesin-1: it was discovered that certain cargos in oocytes and muscle cells only moved properly when Ensconsin was present to link kinesin to microtubules (pmc.ncbi.nlm.nih.gov). Sung et al. (2008) demonstrated that in fly oocytes, MAP7 is required for proper localization of determinants, acting via kinesin-1; and Metzger et al. (2012) found that in muscle cells, loss of Ensconsin or Kif5 disrupts nuclear positioning, leading to mispositioned myonuclei (pmc.ncbi.nlm.nih.gov) (www.nature.com). Similarly, a study in mammalian muscle cell cultures showed that MAP7 and KIF5B together are needed for moving nuclei to the correct positions during myotube formation (www.nature.com). Mutations in either MAP7 or kinesin heavy chain can lead to nuclei clustering abnormally, causing muscle fiber defects (www.nature.com). These findings highlight that MAP7 is a critical scaffolding factor for kinesin-1-driven transport in vivo.

At the cellular level, MAP7’s presence on microtubules biases organelle traffic toward the microtubule plus-ends (the typical direction of kinesin-1). A 2019 biochemical study (J. Biol. Chem.) reconstituted organelle transport with and without MAP7. In the absence of MAP7, isolated endosomal vesicles (phagosomes) exhibited roughly equal movement toward microtubule plus-ends and minus-ends (i.e., balanced activity of kinesin vs dynein motors). Strikingly, when MAP7 was present on microtubules, ~80% of vesicle movements became plus-end directed, compared to ~50% in controls (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This indicates that MAP7 can switch transport to a kinesin-dominant mode, favoring outgoing (anterograde) traffic (pubmed.ncbi.nlm.nih.gov). MAP7 achieves this not by increasing the power of individual kinesin motors, but by increasing their attachment frequency to microtubules (pubmed.ncbi.nlm.nih.gov). Single-molecule assays showed MAP7 does not change a single kinesin-1’s speed or force output, but it increases the likelihood that a kinesin will bind and stay bound to the microtubule track (pubmed.ncbi.nlm.nih.gov). In practice, this means more kinesin motors can engage simultaneously on a cargo. For cargos with multiple motors, MAP7 led to a greater number of kinesins teaming up, which in turn generated higher collective forces and more persistent plus-end movement (pubmed.ncbi.nlm.nih.gov). Thus, MAP7 acts as a molecular tether or loading factor that improves kinesin-1 access to microtubules, biasing transport toward the cell periphery (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov).

Conversely, MAP7 can exclude or compete with other microtubule-associated proteins, thereby modulating which motors can operate. Notably, MAP7 competes with Tau, the neuronal MAP, for binding sites on the microtubule lattice (pmc.ncbi.nlm.nih.gov). Tau is known to impede kinesin binding when abundant, so MAP7’s ability to displace Tau may relieve this inhibition and favor kinesin-1 attachment (pmc.ncbi.nlm.nih.gov). Additionally, MAP7 blocks kinesin-3 (KIF1 family) motility on microtubules (pmc.ncbi.nlm.nih.gov). Kinesin-3 motors typically carry different cargo (synaptic vesicles, etc.), so MAP7’s presence might prioritize kinesin-1 driven transport (e.g., of organelles) at the expense of kinesin-3 cargo if both compete for the same microtubule track (pmc.ncbi.nlm.nih.gov). This selective promotion of kinesin-1 is significant in contexts like axon development: kinesin-1 transports mitochondria and bulk cargo into axons, whereas kinesin-3 moves synaptic components. A 2018 study (Monroy et al., Nat. Commun.) showed that MAP7 and Tau have antagonistic effects on motor traffic – and indeed they found that MAP7 binding enhances kinesin-1 run length while preventing kinesin-3 from even accessing the microtubule (pmc.ncbi.nlm.nih.gov). Such competitive interactions suggest that cell types or regions with high MAP7 (e.g., proximal axon or soma) will favor large-scale organelle transport by kinesin-1, whereas distal regions with Tau might favor other dynamics. In summary, MAP7 orchestrates motor transport by acting as a platform that recruits kinesin-1 and by organizing the microtubule surface to exclude competing MAPs/motors. Through this, it profoundly influences intracellular trafficking and organelle distribution.

Physiological impacts: The MAP7–kinesin interaction underlies several key processes. In neurons, Chen et al. (eLife 2018) demonstrated that MAP7 is required for axon morphogenesis: by recruiting kinesin-1 to microtubules, MAP7 ensures proper distribution of organelles into growing axons and facilitates axon branch formation (pmc.ncbi.nlm.nih.gov) (www.nature.com). Without MAP7, developing neurons have transport defects that lead to shorter axons and fewer branches, linking the molecular interaction to neurodevelopment. In muscle cells, as mentioned, MAP7-mediated recruitment of kinesin is required to move nuclei along microtubules to evenly space them in muscle fibers (pmc.ncbi.nlm.nih.gov). Furthermore, in Drosophila S2 cells (a model for non-polarized cells), MAP7 was shown to help distribute organelles properly, again via kinesin-1 (pmc.ncbi.nlm.nih.gov). These diverse examples (neurons, muscle, oocytes, epithelial cells) led experts to conclude that “MAP7 is involved both in kinesin-1-based transport and microtubule organization in a variety of cell types.” (pmc.ncbi.nlm.nih.gov). It serves as a bridge between the structural microtubule network and the motile machinery of the cell.

Roles in Cell Cycle and DNA Damage Response

Beyond its known functions in interphase cells, emerging research has uncovered roles for MAP7 in the cell cycle and genome maintenance. As discussed, MAP7 associates with spindle microtubules during mitosis, and studies in 2014 (J. Cell Biol.) showed Ensconsin is needed for proper spindle assembly in fly neural stem cells (pmc.ncbi.nlm.nih.gov). It promotes the growth of spindle microtubules and the separation of centrosomes, ensuring a functional bipolar spindle (pmc.ncbi.nlm.nih.gov). In human cells, MAP7’s loading onto the spindle at metaphase suggests it could help stabilize the spindle or assist in chromosome alignment, although the exact molecular role in mitosis in mammals is still being investigated. Intriguingly, a recent study revealed a novel role for MAP7 in DNA double-strand break (DSB) repair during the G1 phase of the cell cycle. In iScience (2023), Dullovi et al. used quantitative proteomics to find proteins that interact with DNA repair factors. They discovered that MAP7 and its paralog MAP7D1 bind to several key DSB repair proteins – including RAD50, BRCA1, and 53BP1 (pubmed.ncbi.nlm.nih.gov). This was unexpected, as these repair factors operate in the nucleus at DNA damage foci, whereas MAP7 is primarily cytoplasmic. The study found that depleting MAP7 or MAP7D1 exacerbated the DNA damage response: cells with reduced MAP7/MAP7D1 had increased p53 phosphorylation after ionizing radiation (indicating more DNA damage stress) and showed a pronounced G1 cell cycle arrest phenotype (pubmed.ncbi.nlm.nih.gov). Moreover, knockdown of MAP7 (especially together with MAP7D1) impaired the repair of DSBs – specifically, RAD50 could not be efficiently recruited to chromatin, and 53BP1 foci at damage sites were diminished in G1-arrested cells lacking MAP7 (pubmed.ncbi.nlm.nih.gov). These results suggest that MAP7 family proteins somehow facilitate proper DNA repair, perhaps by organizing the microtubule network in response to damage or by positioning the nucleus/chromatin for efficient repair complex assembly.

One hypothesis is that microtubule reorganization after DNA damage (a known phenomenon) might involve MAP7 to recruit or modulate repair complexes. Microtubules can influence nuclear processes by transporting signaling proteins or altering nuclear mechanics. The finding that MAP7 physically interacts with BRCA1 and 53BP1, two crucial but antagonistic DNA repair mediators, raises the possibility that MAP7 might coordinate the choice or efficiency of repair pathways (pubmed.ncbi.nlm.nih.gov). It could, for instance, help bring certain repair factors to the vicinity of damaged DNA or anchor the nucleus via cytoskeletal connections during repair. While the precise mechanism remains to be elucidated, this 2023 evidence firmly establishes MAP7 as a player in the DNA damage response – a completely new facet of its function. It underscores the integration between the cytoskeletal system and genome stability mechanisms. Notably, this is the first report linking MAP7 to DNA repair and cell cycle checkpoints (pubmed.ncbi.nlm.nih.gov). It opens interesting questions about whether MAP7’s microtubule stabilization ability is needed to create a scaffold for repair complexes, or whether its motor recruitment function might help ferry repair proteins. In any case, the involvement of MAP7 in guarding genomic integrity further increases the significance of this protein in cell biology.

Regulation by Cellular Stress and Signaling

MAP7’s activity is modulated by various cellular signals and stresses, allowing it to adapt microtubule functions to changing conditions. We have already mentioned phosphorylation control during mitosis and Par-1/MARK kinase regulation during cell polarity establishment. Another layer of regulation comes from osmotic stress and cytoplasmic crowding. The 2024 Dev Cell study by Shen & Ori-McKenney revealed that altering cytoplasmic density (through osmotic shocks) causes rapid changes in MAP7 behavior (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Under hyperosmotic conditions (high external salt/sugar, cell shrinks), the cytoplasm becomes crowded and macromolecular diffusion slows – a situation that cells counter by strengthening their cytoskeleton. In this scenario, MAP7 was found to increase its binding to microtubules and promote tubulin acetylation, helping to stabilize microtubules and maintain intracellular transport when diffusion is limited (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This leads to a bias in cargo trafficking: cells with more MAP7 association continue moving organelles along microtubules despite the crowded cytosol, thus adapting to osmotic stress (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Conversely, under hypoosmotic or dilute conditions, MAP7 disengages from microtubules and detyrosination of tubulin increases (pmc.ncbi.nlm.nih.gov). These coordinated changes show that MAP7 is part of a broader cellular stress-response mechanism, tuning the microtubule network’s stability and the “tubulin code” (PTMs) to ensure vital processes like vesicle transport remain operational in suboptimal conditions (pmc.ncbi.nlm.nih.gov). By promoting acetylation, MAP7 effectively makes microtubules more resilient (acetylated microtubules resist mechanical stress and support continuous organelle movement (pmc.ncbi.nlm.nih.gov)). This insight extends MAP7’s importance to contexts such as osmotic shock, potentially cell migration in varying extracellular matrices (which impose mechanical stress), or volume changes.

Additionally, MAP7 might be regulated by other signaling pathways. Though not extensively detailed in literature, its ability to bind motors suggests it could be a target for signaling cascades that need to rapidly redirect intracellular traffic. For example, growth factor signaling or cell polarity pathways might modulate MAP7 (via phosphorylation or localization changes) to send more motors (and thus cargo) to a particular region of the cell. The MARK kinase example in oocytes demonstrates how spatial cues can confine MAP7 activity, thereby polarizing the flow of cargo (like determinants to the anterior of oocyte) (pmc.ncbi.nlm.nih.gov). Another example is during neuronal branching: local translation or activation of MAP7 in nascent branches could promote microtubule stabilization and organelle delivery to that branch, reinforcing its growth. Indeed, Tymanskyj et al. (2017) found that loss of MAP7 in neurons led to reduced microtubule acetylation specifically in new branches, which corresponded with stunted branch development (pmc.ncbi.nlm.nih.gov). This suggests a feedback where MAP7 is upregulated or activated in regions requiring new microtubule outgrowth.

In summary, MAP7 is not a static component; it is responsive to cell-intrinsic signals (kinase pathways, developmental cues) and extrinsic stress conditions (osmolarity), adjusting the cytoskeletal architecture accordingly. This flexibility is likely crucial for cells to maintain proper function in the face of environmental changes or during complex processes like differentiation and damage repair.

Clinical and Pathological Significance

Given its central roles in cell architecture and transport, it is perhaps not surprising that dysregulation of MAP7 has been implicated in disease, particularly cancer. Many cancers exhibit altered expression of cytoskeletal proteins, and recent studies have identified MAP7 as a factor in tumor cell migration, invasion, and chemotherapy resistance. Large-scale data analyses and patient studies show that MAP7 is frequently upregulated in aggressive cancers. For example, acute myeloid leukemia (AML) patients with high MAP7 expression have significantly worse outcomes. A 2016 clinical study (Fu et al., Sci. Rep. 6:34546) focused on younger AML patients with normal cytogenetics found that elevated MAP7 expression was associated with adverse overall survival and event-free survival (pmc.ncbi.nlm.nih.gov). In that cohort, those in the high-MAP7 group had poorer prognosis (p≈0.04 for OS) than those with low MAP7, and MAP7 remained an independent prognostic marker in multivariate analysis (pmc.ncbi.nlm.nih.gov). This suggests MAP7 contributes to leukemia progression or therapy resistance. Indeed, an earlier study in colon cancer also noted a prognostic link: the ratio of MAP7 to a housekeeping gene (B2M) in tumors could predict survival in stage II colon cancer (pmc.ncbi.nlm.nih.gov). Such correlations indicate that MAP7 might drive more malignant behavior.

Mechanistic studies in solid tumors strengthen the case that MAP7 promotes metastasis and therapy resistance. In cervical cancer (CC), MAP7 expression is significantly higher in tumors than in normal tissue, and high MAP7 levels correlate with poorer survival of patients (Kaplan–Meier analyses p≈0.001) (pmc.ncbi.nlm.nih.gov). Functional assays by Tang et al. (2020) showed that knocking down MAP7 in cervical cancer cell lines dramatically suppressed their migration and invasion capabilities, and increased apoptosis (pmc.ncbi.nlm.nih.gov). Conversely, MAP7 overexpression enhanced cell motility. At the molecular level, one way MAP7 appears to promote cervical cancer progression is by modulating autophagy pathways. Zhang et al. (2020) reported that MAP7 drives CC cell migration/invasion through altering autophagy – for instance, MAP7 knockdown led to accumulation of autophagy markers and more cell death, suggesting that when MAP7 is high, it may help cancer cells maintain pro-survival autophagy at a level that favors migration over cell death (cancerci.biomedcentral.com). Additionally, MAP7 can influence key signaling hubs in cancer cells. In breast cancer, studies found that high MAP7 activates the NF-κB pathway, thereby upregulating genes that promote metastasis and rendering cells less sensitive to chemotherapeutic drugs (like paclitaxel) (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). High MAP7 in breast tumors was associated with increased migration/invasion and with resistance to paclitaxel, a microtubule-targeting drug – possibly because MAP7’s stabilization of microtubules counteracts the drug’s effects (pubmed.ncbi.nlm.nih.gov). This has raised interest in MAP7 as a marker for drug resistance.

Most recently, ovarian cancer research has highlighted MAP7’s role in driving metastasis and chemotherapy (cisplatin) resistance. Chen et al. (Heliyon, 2024) showed that MAP7 overexpression in ovarian cancer cells induces an epithelial-to-mesenchymal transition (EMT) phenotype and activates the Wnt/β-catenin signaling pathway, both of which are strongly linked to metastasis and chemoresistance (pmc.ncbi.nlm.nih.gov). They found that silencing MAP7 in cisplatin-resistant ovarian cancer cells reversed EMT (cells became more epithelial-like) and restored sensitivity to cisplatin (pmc.ncbi.nlm.nih.gov). Notably, MAP7 was observed to mis-localize to the nucleus in these resistant cells (pmc.ncbi.nlm.nih.gov). Once in the nucleus, MAP7 can interact with components of the Wnt pathway – specifically, it was shown to bind the protein CBY1 (Chibby1) (pmc.ncbi.nlm.nih.gov). CBY1 normally sequesters β-catenin and prevents it from activating gene transcription. MAP7 interferes with the CBY1–β-catenin interaction, freeing β-catenin to accumulate in the nucleus and turn on EMT and survival genes (pmc.ncbi.nlm.nih.gov). In essence, cancer cells hijacking MAP7 not only benefit from its cytoskeletal effects (enhanced motility) but also from a gene regulatory effect that boosts a pro-metastatic, drug-resistant program. The study concluded that MAP7 is a “pivotal element” in ovarian cancer progression and cisplatin resistance, and that high MAP7 correlates with worse clinical outcomes, making it a promising prognostic marker and potential therapeutic target (pmc.ncbi.nlm.nih.gov). Importantly, experimental reduction of MAP7 resensitized tumors to cisplatin and reduced their invasive behavior (pmc.ncbi.nlm.nih.gov)，pointing to the feasibility of targeting MAP7 in treatment.

Across cancer types, a recurring theme is that overexpression of MAP7 skews cell behavior toward greater survival, mobility, and stress resistance, likely due to its dual ability to stabilize microtubules (aiding cell structural integrity) and reprogram intracellular trafficking and signaling. Cancer cells with high MAP7 can better withstand microtubule-targeting drugs (by stabilizing their microtubules) (pubmed.ncbi.nlm.nih.gov), avoid apoptosis (possibly via autophagy or NF-κB activation) (pubmed.ncbi.nlm.nih.gov), and migrate through tissues (by reorganizing their cytoskeleton and using motors efficiently). Clinically, assessing MAP7 levels might help stratify patients who are at risk of metastasis or drug resistance. For instance, in cervical cancer patients, MAP7 was found to be an independent predictor of overall survival in multivariate analysis (p=0.001) – second only to lymph node metastasis status (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This suggests testing for MAP7 could improve prognostic models. Some cancers (like certain leukemias) might even rely on MAP7 for cell division or survival, although more study is needed there.

Outside of cancer, there are fewer direct disease associations for MAP7. It is not (so far) a known locus for germline mutations causing developmental syndromes in humans. However, given its neuronal roles, researchers have considered it in the context of neurodevelopmental or neurodegenerative disorders. The MAP7 family is expressed in the brain, and perturbations in microtubule stability are a hallmark of neurodegeneration. While the tau protein (MAPT) is heavily studied in Alzheimer’s and related diseases, MAP7’s interplay with tau and kinesin raises the question of whether MAP7 levels or post-translational modifications might contribute to disorders of axonal transport (e.g. some motor neuron diseases or peripheral neuropathies) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). To date, no direct link to a human neurological disease gene has been confirmed for MAP7. There is one report connecting MAP7 to a rare bone development disorder (spondylometaphyseal dysplasia), but evidence is limited (www.genecards.org). It’s possible that as sequencing studies expand, subtle variants in MAP7 could be associated with certain conditions (for example, a 2008 study suggested a MAP7 expression ratio could be a prognostic biomarker in colon cancer (pmc.ncbi.nlm.nih.gov), reflecting a role in cell proliferation).

In summary, MAP7 has emerged as an important molecule in cancer biology, where its normal functions are co-opted to advantage tumor cells. Research in the last few years (2020–2024) has solidified MAP7’s involvement in promoting metastasis (through cytoskeletal reorganization and signaling crosstalk) and in enabling resistance to therapies. This makes it a candidate for drug development – for instance, inhibiting MAP7’s interaction with kinesin or with β-catenin might impair a cancer cell’s ability to spread or survive chemo (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Some authors have even suggested developing small-molecule MAP7 inhibitors as a novel approach to tackle chemoresistant cancers (pmc.ncbi.nlm.nih.gov). While no such inhibitors are available yet, ongoing research is likely to focus on this translational aspect.

Expert Perspectives and Latest Research

Experts view MAP7 as a bridge between stable microtubule networks and active transport, crucial for specialized cell functions. A 2018 review on microtubule-associated proteins summarized that MAP7/Ensconsin has a dual role: it “is involved both in kinesin-1-based transport and microtubule organization in a variety of cell types.” (pmc.ncbi.nlm.nih.gov) This duality – structural support and motor regulation – sets MAP7 apart from many other MAPs that do primarily one or the other. The same review discussed how MAP7’s regulation by phosphorylation is less about binding affinity and more about spatial targeting, underlining that MAP7 is constitutively a strong binder (it doesn’t fall off microtubules unless specifically instructed by signals) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This property likely explains why it so effectively “ensconces” on microtubules and stays attached even under various conditions. Researchers Keating and Borisy, who first noted a stubborn microtubule-bound factor in 1980, laid the groundwork that later led to MAP7’s discovery (pmc.ncbi.nlm.nih.gov). Decades later, modern techniques like cryo-EM and live-cell imaging have provided atomic detail and real-time insight into MAP7’s function – for example, in 2023, Tan et al. (Nature Commun.) showed exactly how the MAP7 MTBD binds in the microtubule groove and stabilizes protofilaments, explaining earlier observations of its stabilization effect (www.nature.com) (www.nature.com). And Shen et al. (Dev Cell 2024) demonstrated how MAP7 modulates the tubulin code, an emerging concept in cell biology that specific tubulin modifications direct motor traffic and cell signaling (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These cutting-edge studies highlight that MAP7 is not a redundant or static MAP, but rather a dynamic regulator with importance in cell stress responses and intracellular communication.

Another key perspective comes from cancer research. A 2022 review in Frontiers in Pharmacology on MAPs in metastasis noted that many MAPs are altered in cancer and can drive invasion and EMT (pmc.ncbi.nlm.nih.gov). While that review focused on several MAP families, it cited evidence that MAP7 upregulation is frequently observed in metastatic cancers and linked to worse outcomes (pmc.ncbi.nlm.nih.gov). For instance, high MAP7 was correlated with advanced disease and poor prognosis in cervical and ovarian cancers, consistent with the primary studies we discussed. This aligns with the idea that microtubule dynamics are key to cancer cell motility, and MAP7, by altering those dynamics (and enhancing plus-end directed transport), pushes cells toward a motile, mesenchymal state. The authors emphasized that targeting MAPs like MAP7 could be a way to interfere with metastasis at the cytoskeletal level (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). However, they also caution that further in vivo validation is needed (for example, using animal models to see if MAP7 depletion curtails metastasis) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Latest developments (2023–2024) have expanded MAP7’s known roles: the discovery of its involvement in DNA repair (Dullovi et al. 2023, iScience) adds a novel dimension in cell cycle biology (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov), and the detailed dissection of how MAP7 influences microtubule PTMs and cargo transport under stress (Shen & Ori-McKenney 2024) provides mechanistic insight into how cells adapt their interiors to environmental changes (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These findings collectively paint MAP7 as a sensor and effector within the cell’s structural network – it senses signals (e.g. stress, developmental cues, DNA damage) and responds by reconfiguring the microtubule scaffold and transport machinery. Such a role is critical for cell survival and function, which is why MAP7 is conserved across species (human MAP7 shares ~81% identity with mouse Map7/Ensconsin (pubmed.ncbi.nlm.nih.gov) and Drosophila Ensconsin can function in mammalian cells, indicating functional conservation).

In conclusion, MAP7 (Ensconsin) is a versatile microtubule-associated protein that stabilizes microtubules and orchestrates motor-based transport. It is vital for maintaining cell polarity in epithelial cells, for proper neuronal axon growth, and for the intracellular positioning of organelles and even nuclei. Its activity is finely regulated by phosphorylation and cellular context, ensuring it engages microtubules at the right place and time (such as on the mitotic spindle or in response to stress). The importance of MAP7 is further underscored by its emerging roles in critical pathways like DNA damage repair and its clear involvement in cancer progression and drug resistance. Ongoing research is likely to delve deeper into MAP7’s interactions (what other proteins does it bind?), its regulation (e.g. are there phosphatases or kinases other than MARK that target it?), and its potential as a therapeutic target in diseases. Given the breadth of processes it influences, MAP7 stands out as a key integrator of the cellular infrastructure – linking the static support role of microtubules with the dynamic needs of intracellular transport and signaling. As one study succinctly stated, understanding MAP7 is essential to understanding “the microtubule landscape” of the cell and how its modulation affects physiology and pathology (pmc.ncbi.nlm.nih.gov). The current understanding, enriched by recent research, solidifies MAP7’s status as a crucial player in cell biology, with relevance from basic science to potential medical applications.

References: (Publication dates and sources for cited works are provided in the citation brackets)

Citations

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  60. AnnotationURLCitation(end_index=20220, start_index=20069, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=MAP7%20competes%20with%20another%20MAP%2C,DRG%29%20neurons%2C%20and')
  61. AnnotationURLCitation(end_index=20552, start_index=20442, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Faire%20et%20al,In%20vitro')
  62. AnnotationURLCitation(end_index=20946, start_index=20836, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Faire%20et%20al,In%20vitro')
  63. AnnotationURLCitation(end_index=21070, start_index=20947, title='A structural and dynamic visualization of the interaction between MAP7 and microtubules | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-46260-5#:~:text=match%20at%20L56%20Additionally%2C%20MAP7,16')
  64. AnnotationURLCitation(end_index=21363, start_index=21240, title='A structural and dynamic visualization of the interaction between MAP7 and microtubules | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-46260-5#:~:text=match%20at%20L56%20Additionally%2C%20MAP7,16')
  65. AnnotationURLCitation(end_index=21607, start_index=21484, title='A structural and dynamic visualization of the interaction between MAP7 and microtubules | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-46260-5#:~:text=match%20at%20L56%20Additionally%2C%20MAP7,16')
  66. AnnotationURLCitation(end_index=22458, start_index=22309, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=how%20the%20activation%20of%20kinesin,does%20not%20alter%20the%20force')
  67. AnnotationURLCitation(end_index=22610, start_index=22459, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=phagosomes%20move%20toward%20the%20plus,does%20not%20alter%20the%20force')
  68. AnnotationURLCitation(end_index=22895, start_index=22730, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=reconstituted%20their%20motility%20in%20vitro,greater%20number%20of%20kinesin%20motors')
  69. AnnotationURLCitation(end_index=23175, start_index=23037, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=of%20full,generating%20force%20to%20preferentially%20target')
  70. AnnotationURLCitation(end_index=23511, start_index=23373, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=of%20full,generating%20force%20to%20preferentially%20target')
  71. AnnotationURLCitation(end_index=23933, start_index=23768, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=reconstituted%20their%20motility%20in%20vitro,greater%20number%20of%20kinesin%20motors')
  72. AnnotationURLCitation(end_index=24230, start_index=24085, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=a%20ubiquitous%20MAP%20that%20organizes,driven%20transport%2C%20we')
  73. AnnotationURLCitation(end_index=24396, start_index=24231, title='MAP7 regulates organelle transport by recruiting kinesin-1 to microtubules - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/31085585/#:~:text=reconstituted%20their%20motility%20in%20vitro,greater%20number%20of%20kinesin%20motors')
  74. AnnotationURLCitation(end_index=24773, start_index=24628, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L584%20MAP7%20competes,DRG%29%20neurons%2C%20and')
  75. AnnotationURLCitation(end_index=25073, start_index=24922, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=MAP7%20competes%20with%20another%20MAP%2C,DRG%29%20neurons%2C%20and')
  76. AnnotationURLCitation(end_index=25299, start_index=25154, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L584%20MAP7%20competes,DRG%29%20neurons%2C%20and')
  77. AnnotationURLCitation(end_index=25688, start_index=25543, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L584%20MAP7%20competes,DRG%29%20neurons%2C%20and')
  78. AnnotationURLCitation(end_index=26283, start_index=26138, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L584%20MAP7%20competes,DRG%29%20neurons%2C%20and')
  79. AnnotationURLCitation(end_index=27254, start_index=27116, 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=mechanisms%20in%20neuronal%20cells%20,Google%20Scholar')
  80. AnnotationURLCitation(end_index=27374, start_index=27255, title='A structural and dynamic visualization of the interaction between MAP7 and microtubules | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-46260-5#:~:text=13,MAP7%20promotes%20proliferation%20and')
  81. AnnotationURLCitation(end_index=27796, start_index=27686, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Faire%20et%20al,In%20vitro')
  82. AnnotationURLCitation(end_index=28054, start_index=27944, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Faire%20et%20al,In%20vitro')
  83. AnnotationURLCitation(end_index=28420, start_index=28265, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L588%20overexpression%20of,a%20variety%20of%20cell%20types')
  84. AnnotationURLCitation(end_index=29030, start_index=28904, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Chretien%20D%2C%20Richard,Google%20Scholar')
  85. AnnotationURLCitation(end_index=29278, start_index=29152, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Chretien%20D%2C%20Richard,Google%20Scholar')
  86. AnnotationURLCitation(end_index=30033, start_index=29914, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36852271/#:~:text=integrity,a%20strong%20G1%20arrest%20and')
  87. AnnotationURLCitation(end_index=30587, start_index=30432, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36852271/#:~:text=several%20DNA%20repair%20proteins%20including,the%20first%20time%20a%20novel')
  88. AnnotationURLCitation(end_index=30973, start_index=30835, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36852271/#:~:text=to%20increased%20phosphorylation%20of%20p53,strand%20breaks')
  89. AnnotationURLCitation(end_index=31801, start_index=31682, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36852271/#:~:text=integrity,a%20strong%20G1%20arrest%20and')
  90. AnnotationURLCitation(end_index=32458, start_index=32324, title='Microtubule-associated proteins MAP7 and MAP7D1 promote DNA double-strand break repair in the G1 cell cycle phase - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36852271/#:~:text=that%20the%20downregulation%20of%20MAP7,strand%20breaks')
  91. AnnotationURLCitation(end_index=33505, start_index=33371, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=increasing%20cytoplasmic%20density%20caused%20a,6')
  92. AnnotationURLCitation(end_index=33649, start_index=33506, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=MAP7%20promotes%20and%20protects%20microtubule,acetylation')
  93. AnnotationURLCitation(end_index=34201, start_index=34067, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=increasing%20cytoplasmic%20density%20caused%20a,6')
  94. AnnotationURLCitation(end_index=34334, start_index=34202, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=In%20BEAS,microtubules%20are%20exposed%20to%20a')
  95. AnnotationURLCitation(end_index=34673, start_index=34519, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=density%20by%20modulating%20microtubule%20acetylation%2C,We%20further')
  96. AnnotationURLCitation(end_index=34846, start_index=34674, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=match%20at%20L105%20cellular%20contexts,sterically%20interfering%20with%20vasohibin%201')
  97. AnnotationURLCitation(end_index=35150, start_index=34976, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=association%20with%20microtubules%20and%20enhances,tightly%20linked%20in%20cells%2C%20but')
  98. AnnotationURLCitation(end_index=35592, start_index=35420, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=match%20at%20L105%20cellular%20contexts,sterically%20interfering%20with%20vasohibin%201')
  99. AnnotationURLCitation(end_index=35915, start_index=35763, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=cellular%20contexts,sterically%20interfering%20with%20vasohibin%201')
  100. AnnotationURLCitation(end_index=36876, start_index=36736, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L613%20Par,mutations%20of%20six%20predicted')
  101. AnnotationURLCitation(end_index=37450, start_index=37280, title='Microtubule-Associated Protein MAP7 Promotes Tubulin Posttranslational Modifications and Cargo Transport to Enable Osmotic Adaptation - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11187767/#:~:text=acetylation%20signal%20that%20expanded%20to,acetylation%2C%20but%20not%20vice%20versa')
  102. AnnotationURLCitation(end_index=38962, start_index=38827, title='High expression of MAP7 predicts adverse prognosis in young patients with cytogenetically normal acute myeloid leukemia - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5043276/#:~:text=expression%20%28MAP7,I%20genetic%20categories%20and')
  103. AnnotationURLCitation(end_index=39283, start_index=39148, title='High expression of MAP7 predicts adverse prognosis in young patients with cytogenetically normal acute myeloid leukemia - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5043276/#:~:text=expression%20%28MAP7,I%20genetic%20categories%20and')
  104. AnnotationURLCitation(end_index=39642, start_index=39539, title='High expression of MAP7 predicts adverse prognosis in young patients with cytogenetically normal acute myeloid leukemia - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5043276/#:~:text=10,Google%20Scholar')
  105. AnnotationURLCitation(end_index=40209, start_index=40031, title='Enhanced expression of microtubule-associated protein 7 functioned as a contributor to cervical cancer cell migration and is predictive of adverse prognosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC7392727/#:~:text=The%20association%20between%20MAP7%20expression,analysis%20revealed%20that%20MAP7%20expression')
  106. AnnotationURLCitation(end_index=40571, start_index=40407, title='Enhanced expression of microtubule-associated protein 7 functioned as a contributor to cervical cancer cell migration and is predictive of adverse prognosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC7392727/#:~:text=MAP7%20expression%20can%20be%20served,HeLa%20cells%20elevated%20the%20expression')
  107. AnnotationURLCitation(end_index=41251, start_index=41092, title='MAP7 promotes migration and invasion and progression of human cervical cancer through modulating the autophagy | Cancer Cell International | Full Text', type='url_citation', url='https://cancerci.biomedcentral.com/articles/10.1186/s12935-020-1095-4#:~:text=MAP7%20promotes%20migration%20and%20invasion,2020')
  108. AnnotationURLCitation(end_index=41687, start_index=41532, title='MAP7 Promotes Breast Cancer Cell Migration and Invasion by Regulating the NF-B Pathway - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36261182#:~:text=MAP7%20Promotes%20Breast%20Cancer%20Cell,Methods%3A%20The%20MAP7%20transcript')
  109. AnnotationURLCitation(end_index=41861, start_index=41688, title='MAP7 promotes proliferation and migration of breast cancer cells and reduces the sensitivity of breast cancer cells to paclitaxel - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/35657774/#:~:text=MAP7%20promotes%20proliferation%20and%20migration,breast%20cancer%20cells%20were%20established')
  110. AnnotationURLCitation(end_index=42263, start_index=42090, title='MAP7 promotes proliferation and migration of breast cancer cells and reduces the sensitivity of breast cancer cells to paclitaxel - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/35657774/#:~:text=MAP7%20promotes%20proliferation%20and%20migration,breast%20cancer%20cells%20were%20established')
  111. AnnotationURLCitation(end_index=42872, start_index=42739, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=the%20silencing%20of%20MAP7%20attenuates,catenin')
  112. AnnotationURLCitation(end_index=43169, start_index=43036, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=the%20silencing%20of%20MAP7%20attenuates,catenin')
  113. AnnotationURLCitation(end_index=43403, start_index=43258, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=metastasis%20and%20chemoresistance.%20In%20cisplatin,catenin')
  114. AnnotationURLCitation(end_index=43718, start_index=43547, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=In%20summary%2C%20our%20research%20sheds,challenge%20in%20ovarian%20cancer%20treatment')
  115. AnnotationURLCitation(end_index=44113, start_index=43942, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=In%20summary%2C%20our%20research%20sheds,challenge%20in%20ovarian%20cancer%20treatment')
  116. AnnotationURLCitation(end_index=44660, start_index=44565, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=Conclusion')
  117. AnnotationURLCitation(end_index=44908, start_index=44775, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=the%20silencing%20of%20MAP7%20attenuates,catenin')
  118. AnnotationURLCitation(end_index=45556, start_index=45383, title='MAP7 promotes proliferation and migration of breast cancer cells and reduces the sensitivity of breast cancer cells to paclitaxel - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/35657774/#:~:text=MAP7%20promotes%20proliferation%20and%20migration,breast%20cancer%20cells%20were%20established')
  119. AnnotationURLCitation(end_index=45774, start_index=45619, title='MAP7 Promotes Breast Cancer Cell Migration and Invasion by Regulating the NF-B Pathway - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/36261182#:~:text=MAP7%20Promotes%20Breast%20Cancer%20Cell,Methods%3A%20The%20MAP7%20transcript')
  120. AnnotationURLCitation(end_index=46356, start_index=46178, title='Enhanced expression of microtubule-associated protein 7 functioned as a contributor to cervical cancer cell migration and is predictive of adverse prognosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC7392727/#:~:text=The%20association%20between%20MAP7%20expression,analysis%20revealed%20that%20MAP7%20expression')
  121. AnnotationURLCitation(end_index=46524, start_index=46357, title='Enhanced expression of microtubule-associated protein 7 functioned as a contributor to cervical cancer cell migration and is predictive of adverse prognosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC7392727/#:~:text=match%20at%20L327%20remarkably%20associated,002%29%20may%20serve%20as%20independent')
  122. AnnotationURLCitation(end_index=47613, start_index=47468, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=match%20at%20L584%20MAP7%20competes,DRG%29%20neurons%2C%20and')
  123. AnnotationURLCitation(end_index=47765, start_index=47614, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=MAP7%20competes%20with%20another%20MAP%2C,DRG%29%20neurons%2C%20and')
  124. AnnotationURLCitation(end_index=48111, start_index=47986, title='MAP7 Gene - GeneCards | MAP7 Protein | MAP7 Antibody', type='url_citation', url='https://www.genecards.org/cgi-bin/carddisp.pl?gene=MAP7#:~:text=MAP7%20,of%20this%20gene%20is%20MAP7D1')
  125. AnnotationURLCitation(end_index=48442, start_index=48339, title='High expression of MAP7 predicts adverse prognosis in young patients with cytogenetically normal acute myeloid leukemia - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5043276/#:~:text=10,Google%20Scholar')
  126. AnnotationURLCitation(end_index=49118, start_index=49023, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=Conclusion')
  127. AnnotationURLCitation(end_index=49290, start_index=49119, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=In%20summary%2C%20our%20research%20sheds,challenge%20in%20ovarian%20cancer%20treatment')
  128. AnnotationURLCitation(end_index=49592, start_index=49424, title='MAP7 drives EMT and cisplatin resistance in ovarian cancer via wnt/β-catenin signaling - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11078642/#:~:text=MAP7%2C%20as%20a%20biomarker%20linked,warrants%20further%20research%20and%20efforts')
  129. AnnotationURLCitation(end_index=50218, start_index=50089, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=%28Monroy%20et%20al,DRG%29%20neurons%2C%20and')
  130. AnnotationURLCitation(end_index=50780, start_index=50614, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=phosphorylation%20effects%20on%20MAP%20activity,rich%20regions%20with%20the%20cell')
  131. AnnotationURLCitation(end_index=50901, start_index=50781, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=Par,mutations%20of%20six%20predicted')
  132. AnnotationURLCitation(end_index=51338, start_index=51181, title='ReMAPping the Microtubule Landscape: How Phosphorylation Dictates the Activities of Microtubule-Associated Proteins - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5739964/#:~:text=MAP7%2C%20also%20known%20as%20Ensconsin,Bulinski%20and%20Borisy%2C%201980')
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