| Section | Provisional content |
|---|---|
| Note | No citable contexts were retrievable in this run, so all statements below are provisional and require manual review of the seed PMIDs before curation use. Seed PubMed URLs: PMID:25062452 — https://pubmed.ncbi.nlm.nih.gov/25062452/ ; PMID:32402064 — https://pubmed.ncbi.nlm.nih.gov/32402064/ ; PMID:34718620 — https://pubmed.ncbi.nlm.nih.gov/34718620/ ; PMID:35718780 — https://pubmed.ncbi.nlm.nih.gov/35718780/ |
| Executive judgment | **Partially supported (provisional).** The seed evidence is consistent with biallelic or otherwise damaging **SYCE1** variants causing meiotic failure via synaptonemal-complex dysfunction, but confidence is limited because none of the cited papers were retrievable here for direct verification. |
| Evidence matrix pointer | Use the seed evidence set to verify four main evidence classes: human familial genetics (PMID:25062452), mouse/model loss-of-function and synapsis evidence (PMID:32402064), in vitro interaction/SC assembly disruption (PMID:34718620), and human male NOA histology/CNV evidence (PMID:35718780). |
| Clinical spectrum | **46,XX:** primary ovarian insufficiency / primary amenorrhea. **46,XY:** non-obstructive azoospermia with **pachytene-stage spermatogenic arrest** on H&E/IF. Specific endocrine values, ovarian imaging, and detailed histopathology were not retrievable in this run. |
| Variants / inheritance | Provisional model: **autosomal recessive / biallelic**. Seed evidence mentions a **homozygous nonsense variant c.613C>T**, additional damaging variants affecting SYCE1 interactions, and **SYCE1 CNVs**; exact zygosity/phasing, family counts, and ACMG classifications require manual verification. |
| Mechanistic chain | Provisional chain: **biallelic SYCE1 loss/damaging variant -> reduced or absent SYCE1 -> disrupted interaction with SYCP1 and/or C14ORF39/SIX6OS1 -> synaptonemal-complex central element assembly failure -> homologous chromosome synapsis failure -> pachytene arrest/checkpoint activation -> germ-cell depletion -> 46,XX POI/primary amenorrhea or 46,XY NOA/spermatogenic arrest**. |
| Diagnostics / management implications | Provisional practice implications: include **SYCE1** on infertility/POI/NOA genetic panels with **CNV detection**; in 46,XY consider semen analysis, endocrine evaluation, and biopsy when indicated; in 46,XX assess ovarian reserve and POI biochemistry. Management likely follows standard care pathways: hormone replacement for POI as indicated, fertility counseling, donor-oocyte discussion for POI, and cautious consideration of micro-TESE/ICSI in NOA. |
| Ontology suggestions | **HPO:** Primary ovarian insufficiency; Primary amenorrhea; Female infertility; Azoospermia; Non-obstructive azoospermia; Spermatogenic arrest; Hypergonadotropic hypogonadism. **GO:** Meiotic cell cycle; Homologous chromosome pairing; Synaptonemal complex assembly; Meiotic recombination; Germ cell apoptotic process. **CL:** Primary oocyte; Spermatocyte; Pachytene spermatocyte; Germ cell. **Treatment/action terms:** Genetic testing; Genetic counseling; Hormone replacement therapy; Fertility preservation; Oocyte cryopreservation; Micro-TESE; ICSI; PGT-M. |
| Gaps | Major gaps are due to retrieval failure: no verified full texts, no figure/table access, no confirmed endocrine data (e.g., FSH/AMH), incomplete histology details, uncertain CNV phasing/zygosity, and limited direct human evidence for checkpoint activation or apoptosis. No 2023-2024 studies could be prioritized in this environment. |
| Curator leads | Provisional updates to consider after verification: (1) annotate the mechanism as a **meiotic synaptonemal-complex central element assembly defect**; (2) capture the dual-sex phenotype of **46,XX POI/primary amenorrhea** and **46,XY NOA/pachytene arrest**; (3) note support for **loss-of-function and CNV** mechanisms; (4) add the partner-interaction mechanism involving **SYCP1** and **C14ORF39/SIX6OS1**. |


*Table: This table integrates the requested provisional curation elements for SYCE1-related gametogenic failure using only the seed PMIDs. It is useful as a compact curator checklist when literature retrieval is blocked and claims must remain provisional pending manual verification.*