SYCP3-Related Spermatogenic Failure (SPGF4) Deep Research Fallback

Provider Attempts

No Falcon or OpenScientist deep research artifact was generated for this entry. Curation was conducted directly from primary literature using fetched PubMed caches, without hand-editing any references_cache/*.md files.

Evidence Scope Used For Curation

• PMID:14643120 (Miyamoto et al., Lancet 2003): human clinical series reporting heterozygous SYCP3 C-terminal truncating variants (643delA) in two azoospermic men; functional data showing dominant-negative interference with SYCP3 fibre formation in cultured cells; anchors the causal variant and dominant mechanism.
• PMID:10678170 (Yuan et al., Mol Cell 2000): Sycp3-null male mouse model demonstrating that SYCP3/SCP3 is required for axial/lateral element assembly, homologous chromosome synapsis, and male fertility; complete azoospermia with pachytene-stage apoptotic germ-cell death in homozygous null males.
• PMID:12004129 (Yuan et al., Science 2002): Sycp3-null female mouse model demonstrating oocyte aneuploidy and early embryo death via defective meiotic chromosome segregation; supports the mechanistic basis for the contested female oocyte-aneuploidy / recurrent pregnancy loss branch.
• PMID:19110213 (Bolor et al., AJHG 2009): human female cohort reporting SYCP3 variants associated with recurrent pregnancy loss; provides SUPPORT evidence for the contested female branch.
• PMID:21357605 (Mizutani et al., Hum Reprod 2011): follow-up human study failing to confirm the SYCP3 657T>C variant association with aneuploidy-related recurrent miscarriage; provides REFUTE evidence for the contested female branch.

NEC Preflight Summary

MONDO:0010052 (spermatogenic failure 4) was verified via OAK as the correct gene-anchored entity for SYCP3 (HGNC:18130, OMIM:270960). The disease is defined as azoospermia caused by mutation in SYCP3. No "SYCP3-related gametogenic failure" dyadic MONDO term exists; this entry is therefore anchored on the male azoospermia entity and models the contested female branch in the pathophysiology rather than as an asserted phenotype.

Curation Conclusions

SYCP3 encodes the axial/lateral element of the synaptonemal complex. Dominant- negative heterozygous C-terminal truncating variants prevent SYCP3 fibre assembly, causing synaptonemal complex assembly failure and homologous chromosome asynapsis during meiotic prophase I. Asynapsis triggers the pachytene checkpoint (meiotic recombination checkpoint signaling) and germ-cell apoptosis, producing spermatogenic maturation arrest and non-obstructive azoospermia. The male phenotype is well established. A female recurrent-pregnancy-loss phenotype linked to oocyte aneuploidy has been proposed but is contested: one small cohort study (Bolor 2009) reports the association; a subsequent study (Mizutani 2011) does not replicate it. The female branch is therefore modeled with both supporting and refuting evidence.

The entry conforms to the meiotic_prophase_failure module at: - #Synaptonemal Complex Assembly - #Pachytene Checkpoint Arrest and Germ Cell Apoptosis - #Spermatogenic Arrest and Non-Obstructive Azoospermia