The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
The target is correctly identified as Caenorhabditis elegans sun-1, also called mtf-1/matefin and corresponding to ORF F57B1.2, not mammalian SUN1 or a similarly named gene in another organism. Its product is a conserved SUN-domain inner nuclear membrane protein and the nuclear-side component of a LINC (linker of nucleoskeleton and cytoskeleton) complex. Its primary molecular function is therefore structural and mechanotransductive, not enzymatic: SUN-1 binds the outer-nuclear-membrane KASH protein ZYG-12 across the perinuclear space and couples nuclear structures—including meiotic chromosome pairing centers—to cytoplasmic dynein and microtubules. This bridge transmits force required for meiotic chromosome movement, homolog recognition and pairing, prevention of inappropriate nonhomologous synapsis, and embryonic centrosome–nucleus attachment. SUN-1 also serves as a regulated nuclear-envelope scaffold whose phosphorylation and oligomerization control the timing, distribution, and mechanical stability of these connections. (daryabeigi2016nuclearenveloperetention pages 1-7, minn2009sun1andzyg12 pages 8-9, penkner2009meioticchromosomehomology pages 1-2)
| Aspect | Current annotation | Strongest evidence | Evidence type | Key source/date |
|---|---|---|---|---|
| Identity | C. elegans sun-1, also mtf-1/matefin, ORF F57B1.2, UniProt Q20924 | Worm studies consistently identify MTF-1/SUN-1 as the germline and embryonic nuclear-envelope SUN protein; the supplied F57B1.2/Q20924 identity is concordant and distinct from mammalian SUN1. | Gene/protein identity; organism-specific genetics | Penkner et al., June 2007 (penkner2007thenuclearenvelope pages 1-2); Penkner et al., Nov. 25, 2009 (penkner2009meioticchromosomehomology pages 1-2) |
| Topology and domain | Type-II inner nuclear membrane protein with nucleoplasmic N terminus, one functional transmembrane segment, and luminal C-terminal SUN domain | Topology mapping placed the N terminus in the nucleoplasm and C-terminal SUN region in the nuclear-envelope lumen; jf18/G311V lies in the conserved SUN domain. | Membrane-topology analysis; sequence conservation; mutant mapping | Minn et al., Nov. 1, 2009 (minn2009sun1andzyg12 pages 8-9); Penkner et al., June 2007 (penkner2007thenuclearenvelope pages 1-2) |
| ZYG-12 LINC partnership | Inner-membrane SUN component of a SUN-1–ZYG-12 LINC bridge | SUN-1 and outer-membrane KASH protein ZYG-12 colocalize, coprecipitate, and interact across the perinuclear lumen; SUN-1 is required for ZYG-12 nuclear-envelope recruitment. | CoIP/binding; deletion mapping; localization dependency | Minn et al., Nov. 1, 2009 (minn2009sun1andzyg12 pages 8-9); Penkner et al., Nov. 25, 2009 (penkner2009meioticchromosomehomology pages 1-2) |
| Lamin association | Connects the LINC bridge to the nuclear lamina/nucleoskeleton | SUN-1 binds lamin directly in vitro; lamin and SUN-1 phosphorylation influence one another’s mitotic localization, although interphase targeting can be independent. | In-vitro interaction; RNAi; phosphomutant imaging | Zuela & Gruenbaum, Feb. 2016 (zuela2016matefinsun1phosphorylationon pages 12-13) |
| MJL-1 and pairing centers | SUN-1 provides the inner-envelope receptor/stabilizing platform linking meiotic pairing centers to LINC complexes through MJL-1 | MJL-1 colocalizes and coimmunoprecipitates with SUN-1; SUN-1 loss removes MJL-1 from the envelope, and SUN-1 Y128F disrupts this linkage. CHK-2/PLK-2-dependent PC proteins connect to the MJL-1–SUN-1 module. | CRISPR genetics; CoIP; auxin degradation; immunofluorescence | Kim et al., Feb. 8, 2023 (kim2023mjl1isa pages 2-3, kim2023mjl1isa pages 3-6) |
| Meiotic movement, pairing, and synapsis | Mechanical adaptor that couples chromosome pairing centers to dynein/microtubules, promoting homolog search and restricting synapsis to homologs | sun-1(jf18) abolishes active SUN-1 aggregate motion, disrupts presynaptic alignment, and permits precocious nonhomologous synapsis. X-pairing-center motion averaged 59.8 nm/s in wild type versus 18.7 nm/s in sun-1(jf18). | Live imaging; mutant cytology; chromosome-pairing assays | Penkner et al., June 2007 (penkner2007thenuclearenvelope pages 1-2); Baudrimont et al., Nov. 24, 2010 (baudrimont2010leptotenezygotenechromosomemovement pages 1-2); Kim et al., Feb. 8, 2023 (kim2023mjl1isa pages 2-3) |
| Phosphorylation and surveillance | Regulatory scaffold whose N-terminal phosphorylation coordinates movement with synapsis, recombination, and meiotic progression | CHK-2-dependent phosphorylation appears during leptotene/zygotene and declines in pachytene; phosphomimetic mutations extend the transition zone and produce univalents. S12 and other mapped sites participate in an early-prophase checkpoint response to incomplete synapsis/recombination. | Mass spectrometry; phosphosite mutants; stage-specific imaging | Penkner et al., Nov. 25, 2009 (penkner2009meioticchromosomehomology pages 1-2); Woglar et al., March 2013 (woglar2013matefinsun1phosphorylationis pages 13-14) |
| Coiled-coil oligomerization and retention | Coiled-coil-mediated oligomerization stabilizes SUN-1 at the nuclear envelope under mechanical load | Deleting residues 158–235 impaired oligomerization/retention and increased force sensitivity, especially in late oogenesis; LINC assembly and meiotic synapsis remained possible, showing that oligomerization chiefly supports retention rather than basic complex formation. | Structure–function deletion; photoconversion; force-sensitive genetics | Daryabeigi et al., June 2016 (daryabeigi2016nuclearenveloperetention pages 1-7, daryabeigi2016nuclearenveloperetention pages 26-32, daryabeigi2016nuclearenveloperetention pages 41-52) |
| Embryonic centrosome–nucleus attachment | Maternally supplied LINC component needed to anchor centrosomes to the pronuclear/nuclear envelope and support early embryogenesis | Coiled-coil-defective SUN-1 is depleted from embryos and causes centrosome detachment; photoconversion showed that early embryos use maternally supplied SUN-1. S43 phosphorylation also regulates centrosomal localization and ZYG-12/lamin organization. | Maternal-pool photoconversion; embryo imaging; phosphomutants | Daryabeigi et al., June 2016 (daryabeigi2016nuclearenveloperetention pages 41-52); Zuela & Gruenbaum, Feb. 2016 (zuela2016matefinsun1phosphorylationon pages 8-12) |
| Oocyte mechanotransduction | Force-bearing LINC element that can destabilize mechanically unprotected oocyte nuclei | After LMN-1 depletion, SUN-1/ZYG-12 patches remain mobile and polarize into asymmetric caps before nuclear collapse; removing SUN-1, ZYG-12, dynein, or dynactin rescues collapse, demonstrating dynein-force transmission through SUN-1/ZYG-12. | In-vivo live imaging; auxin degradation; RNAi epistasis | Liu et al., July 12, 2023 (liu2023acooperativenetwork pages 2-3, liu2023acooperativenetwork pages 3-6) |
Table: Compact evidence map for the identity, architecture, molecular partners, regulation, and force-transmission functions of C. elegans SUN-1/Q20924. It separates the current functional annotation from the strongest supporting experiments.
SUN-1 is a type-II integral inner nuclear membrane protein. Its N-terminal region faces the nucleoplasm, a single functional transmembrane segment anchors it in the membrane, and the C-terminal region containing the SUN domain projects into the perinuclear lumen. This orientation allows the nucleoplasmic region to associate with lamin, chromatin-associated factors, and meiotic attachment machinery, while the luminal region contacts ZYG-12 in the outer nuclear membrane. (minn2009sun1andzyg12 pages 8-9)
SUN-1 is found at the nuclear envelope of germline nuclei and in early embryos. In mitotic or premeiotic germ cells it is comparatively rim-like; during the leptotene/zygotene “transition zone,” it concentrates into mobile patches at chromosome-attachment sites. SUN-1 and ZYG-12 colocalize and coprecipitate in vivo, and SUN-1 is required to recruit or retain ZYG-12 at the nuclear envelope. (minn2009sun1andzyg12 pages 8-9, penkner2009meioticchromosomehomology pages 1-2)
SUN-1 also interacts with the single worm lamin, LMN-1. Direct interaction has been detected in vitro, and lamin and SUN-1 show interdependent mitotic localization, although their interphase targeting is not absolutely codependent. This provides a nucleoskeletal anchor and helps distribute forces applied through the LINC bridge. (zuela2016matefinsun1phosphorylationon pages 12-13)
SUN-1 is neither an enzyme nor a transporter and has no substrate or catalyzed reaction. Its primary function is to build and regulate a trans-nuclear-envelope mechanical linkage:
Chromosome/pairing-center machinery → MJL-1 and SUN-1 in the inner membrane → ZYG-12 in the outer membrane → dynein/microtubules and centrosomes.
SUN-1 and ZYG-12 form the core SUN/KASH bridge. ZYG-12’s cytoplasmic region associates with dynein and centrosomal isoforms of ZYG-12, while SUN-1 anchors the assembly to nucleoplasmic structures. This architecture enables cytoskeletal forces to move objects inside the nucleus or to anchor centrosomes outside it. (minn2009sun1andzyg12 pages 8-9, stewart2014themissinglinc pages 3-4)
The precise SUN–KASH interface in C. elegans may differ from a simplified generic model. Deletion mapping indicated that a luminal internal region of SUN-1 can bind the ZYG-12 tail and that the conserved SUN domain alone is not sufficient for this interaction. Thus, annotation should emphasize the experimentally established SUN-1–ZYG-12 LINC partnership rather than assume that all binding is mediated solely by the canonical SUN domain. (minn2009sun1andzyg12 pages 8-9)
Unlike many organisms that tether meiotic telomeres, C. elegans uses specialized subtelomeric pairing centers. HIM-8 binds the X-chromosome pairing center, whereas ZIM-1, ZIM-2, and ZIM-3 recognize autosomal pairing centers. These chromosome-bound proteins recruit CHK-2/PLK-2-regulated attachment machinery to SUN-1/ZYG-12 patches. Cytoplasmic dynein then moves the patches—and attached chromosome ends—along the nuclear envelope. (stewart2014themissinglinc pages 3-4, kim2023mjl1isa pages 1-2, kim2023mjl1isa pages 3-6)
Live imaging showed that SUN-1 aggregates move erratically, merge, and separate during leptotene/zygotene. Movement correlates with polarized chromatin organization and depends on an intact SUN/KASH bridge. In sun-1(jf18), active aggregate movement is essentially absent; homolog alignment is lost, and synaptonemal complexes assemble prematurely between nonhomologous chromosomes. These findings establish force transmission, rather than simple static tethering, as a central SUN-1 function. (baudrimont2010leptotenezygotenechromosomemovement pages 1-2, penkner2007thenuclearenvelope pages 1-2)
A useful recent quantitative benchmark comes from 2023 measurements of GFP::HIM-8 pairing-center movement: average speed was 59.8 nm/s in wild type, 22.7 nm/s in mjl-1 mutants, and 18.7 nm/s in sun-1(jf18). The slow residual motion in the mutants was interpreted as diffusion rather than active motor-driven transport. (kim2023mjl1isa pages 2-3)
SUN-1-dependent movement promotes the homology search and presynaptic alignment. It also helps enforce the rule that the synaptonemal complex assembles between homologs rather than unrelated chromosomes. The jf18 separation-of-function mutant retains SUN-1 at the envelope but fails to form normal ZYG-12 patches, lacks presynaptic homolog alignment, and undergoes precocious nonhomologous synapsis. By contrast, null/deletion alleles cause broader germline disorganization, demonstrating that SUN-1 also has functions beyond its meiosis-specific movement module. (penkner2007thenuclearenvelope pages 1-2)
Movement and recombination are reciprocally coordinated. Chromosome-axis integrity is needed to generate normal numbers of SUN-1 attachment plaques; abolishing synapsis slows SUN-1 aggregate motion; and double-strand-break or repair defects alter aggregate dynamics. SUN-1 should therefore be annotated as part of a regulatory-mechanical network coordinating pairing, synapsis, and interhomolog recombination—not as a recombination enzyme itself. (penkner2009meioticchromosomehomology pages 1-2, baudrimont2010leptotenezygotenechromosomemovement pages 1-2)
Multiple residues in the nucleoplasmic N terminus are phosphorylated during early meiotic prophase. CHK-2-dependent phosphorylation appears during leptotene/zygotene, declines during pachytene, and is associated with SUN-1 patch formation and the movement-competent state. Phosphomimetic SUN-1 extends the transition-zone program and produces univalent chromosomes at diakinesis, showing that the modification state regulates both meiotic timing and productive pairing. (penkner2009meioticchromosomehomology pages 1-2)
SUN-1 phosphorylation also participates in a meiotic surveillance system. Incomplete synapsis or recombination prolongs phosphorylated SUN-1, chromosome movement, and the early-prophase state. This response is temporally restricted: zygotene and early-pachytene nuclei respond, whereas later nuclei do not readily reestablish SUN-1 and CHK-1 phosphorylation. S12 is one characterized regulatory site, and broader phosphosite-mutant analyses included T36 and other mapped residues. Phosphorylation correlates with patches and movement but is not simply a consequence of movement or successful pairing. (woglar2013matefinsun1phosphorylationis pages 13-14)
Because its phosphorylation is spatially restricted, pSUN-1—especially pS8 or pS12—is widely used experimentally as a cytological marker of meiotic entry, transition-zone identity, and checkpoint extension. This is an important research application, but marker status should not be confused with the protein’s primary mechanical function.
A separate CDK-1-dependent event at Ser43 regulates SUN-1’s centrosomal localization and mitotic functions in embryos. Constitutive S43 phosphomimicry disrupts ZYG-12 and lamin organization, centrosome integrity, microtubule organization, and fertility. Reported quantitative phenotypes include 39.8% offspring viability for S43E in the presence of endogenous SUN-1 but only 0.6% without endogenous SUN-1, a 39% reduction in egg laying in the null background, and 11–12 univalents rather than six bivalents at diakinesis. Because these experiments used engineered phosphomutants, they strongly support regulatory importance but should not be interpreted as evidence that persistent physiological S43 phosphorylation normally occurs throughout these stages. (zuela2016matefinsun1phosphorylationon pages 8-12, zuela2016matefinsun1phosphorylationon pages 12-13)
SUN-1 forms dimers or higher-order assemblies in vivo. Its coiled-coil region promotes oligomerization and stable inner-membrane retention, particularly during late oogenesis when the bridge is exposed to asymmetric forces. Deletion of residues 158–235 makes SUN-1 force-sensitive and promotes premature loss from the nuclear envelope. Importantly, chromosome sorting and synapsis can still occur without this region, indicating that oligomerization is more important for long-term retention and mechanical resilience than for initial assembly of a functional meiotic LINC complex. (daryabeigi2016nuclearenveloperetention pages 1-7, daryabeigi2016nuclearenveloperetention pages 26-32)
Kim and colleagues identified MJL-1 (MAJIN-like-1), a small meiosis-specific inner-nuclear-membrane protein that bridges pairing centers to SUN-1. MJL-1 colocalizes with SUN-1 and pairing-center proteins, coimmunoprecipitates with SUN-1, and depends on SUN-1 for nuclear-envelope localization or stability. Loss of MJL-1 prevents SUN-1 from concentrating with pairing-center proteins, eliminates active chromosome motion, causes extensive nonhomologous synapsis, and severely impairs homolog pairing. (kim2023mjl1isa pages 2-3, kim2023mjl1isa pages 1-2, kim2023mjl1isa pages 3-6)
The study also identified sun-1(ie143), Y128F, a meiosis-selective allele that removes MJL-1 from the nuclear envelope while preserving essential mitotic SUN-1 functions. This places the SUN-1–MJL-1 interaction near their transmembrane or membrane-adjacent regions. CHK-2 and PLK-2 activity is required for pairing-center proteins to associate with the MJL-1/SUN-1 module, although MJL-1–SUN-1 association itself appears less dependent on PLK-2. (kim2023mjl1isa pages 2-3, kim2023mjl1isa pages 3-6)
MJL-1-null animals produced <1% viable self-progeny, with 29–33% males among survivors, and typically showed 10–12 DAPI bodies at diakinesis rather than six crossover-linked bivalents. These findings reinforce the biological consequence of disrupting the SUN-1-centered attachment module: nondisjunction, failed crossover formation, and embryonic inviability. (kim2023mjl1isa pages 2-3)
Maternally supplied SUN-1 has an essential postmeiotic role in attaching centrosomes to the nuclear envelope in early embryos. SUN-1 recruits ZYG-12 outer-membrane isoforms, which interact with centrosomal ZYG-12 and dynein-associated machinery. Loss or inadequate retention of SUN-1 causes centrosome detachment, defective nuclear/centrosomal organization, and embryonic lethality. (minn2009sun1andzyg12 pages 8-9, daryabeigi2016nuclearenveloperetention pages 41-52)
Photoconversion experiments showed that SUN-1 detected in four-cell embryos derived from protein already present in the −1 oocyte, demonstrating a maternal supply during this developmental interval. This explains why defects in late-oocyte SUN-1 retention have immediate embryonic effects. (daryabeigi2016nuclearenveloperetention pages 41-52)
The broader LINC machinery contributes to pronuclear migration, but the most direct SUN-1 evidence supports ZYG-12 recruitment and centrosome–nucleus attachment. Pronuclear-migration defects should therefore be described as a downstream consequence of impaired LINC/centrosome coupling rather than a separate biochemical activity of SUN-1. (stewart2014themissinglinc pages 3-4)
A 2023 Science Advances study extended SUN-1’s annotation from chromosome movement to oocyte nuclear mechanoprotection and mechanical failure. When LMN-1 was depleted, SUN-1 and ZYG-12 patches remained abnormally mobile into late meiotic prophase and polarized into an asymmetric cap before nuclear collapse. Nuclear-envelope deformation and shrinkage preceded chromosome-volume reduction, arguing that collapse arose from force-induced envelope destabilization rather than apoptosis or chromosome compaction. (liu2023acooperativenetwork pages 2-3, liu2023acooperativenetwork pages 3-6)
Depleting SUN-1 or ZYG-12 rescued collapse, as did depletion of dynein/dynactin components DLC-1, DNC-1, LIS-1, DHC-1, or DLI-1. Thus, SUN-1 is not merely associated with collapsed nuclei; it is required to transmit the damaging asymmetric force when the lamin network is compromised. Pairing-center proteins and MJL-1 were dispensable for this late-prophase collapse, indicating that LINC forces can act independently of the canonical meiotic pairing-center attachment. (liu2023acooperativenetwork pages 2-3, liu2023acooperativenetwork pages 3-6)
This result refines rather than replaces the primary annotation: SUN-1 is a general force-bearing LINC element, with outputs determined by developmental stage and its nuclear partner. During early meiosis, it moves chromosome ends; later, it contributes to nuclear positioning and can stress an inadequately supported envelope.
SUN-1 is chiefly used in basic and translational model-system research rather than in a clinical or industrial implementation:
SUN-1 is a type-II inner nuclear membrane SUN-domain protein that forms a LINC complex with the KASH protein ZYG-12. It anchors nuclear and meiotic chromosome-attachment machinery to cytoplasmic dynein/microtubules, transmitting force required for pairing-center-led chromosome movement, homolog pairing and accurate synapsis, and for centrosome–nucleus attachment in embryos. Its activity and mechanical stability are regulated by stage-specific phosphorylation, interaction with MJL-1 and lamin, and coiled-coil-dependent oligomerization.
The most important recent advance is not a change in SUN-1’s core annotation but a sharper definition of its context-specific connections. The 2023 MJL-1 study supplied the missing inner-envelope adaptor between pairing-center proteins and SUN-1, while the 2023 nuclear-mechanics study showed that SUN-1/ZYG-12 continues to bear dynein-generated forces later in oogenesis and can damage lamin-deficient nuclei. The 2024 literature located in this search mainly used SUN-1 or phospho-SUN-1 as a meiotic-state readout or discussed it within conserved LINC mechanisms; it did not provide a comparably strong revision of Q20924’s direct molecular function. Consequently, the best current interpretation remains that SUN-1 is a regulated, force-transmitting nuclear-envelope scaffold whose principal precise roles are meiotic chromosome coupling and embryonic centrosome–nucleus attachment.
References
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