I'm trying to confirm the PMIDs and abstract quotes for the SSX1 papers. Direct fetches are blocked, so I'm running more searches.

Research report: Spermatogenic Failure, X-linked, 5 (SPGFX5), causal gene SSX1

Verification status. I could read only search-result summaries. Direct fetches of PubMed, PMC and ScienceDirect were refused by the proxy. These items are therefore unverified: - No PMIDs were confirmed. Papers are cited by DOI or PMC ID only. - No quote below is an exact, verified abstract snippet. Treat the quoted fragments as leads and re-fetch them with just fetch-reference before using them as evidence. - Variant details beyond what is listed under section 4 are not verified. - I did not confirm the MONDO ID MONDO:0859477 given in the template. - Nothing below was checked against the repository or run through its validators.

1. Disease information

SPGFX5 is an X-linked male infertility disorder caused by hemizygous loss-of-function variants in SSX1 (SSX family member 1, Xp11.23, OMIM *312820). The phenotype is asthenoteratozoospermia, which means reduced or absent progressive sperm motility together with abnormal sperm morphology, including flagellar defects reported as consistent with multiple morphologic abnormalities of the sperm flagella (MMAF) (MalaCards; OMIM SSX1).

• Identifiers. The disease entry is OMIM 301099, as given in the template and as shown on the mirrors I found (MalaCards). Other mirrors are GTR C5829558, DOID:0070596 and MedGen 1840194.
• Synonyms. SPGFX5, SSX1-related asthenoteratozoospermia. SSX1 is also called CT5.1 and SSRC.
• Data source. The disease-level description rests on one cohort study of individual patients (Liu et al. 2023) and a small number of follow-up reports. It is not drawn from aggregated or EHR data.
• Gene context. SSX1 is better known for the t(X;18) SS18-SSX1 fusion in synovial sarcoma. That is a separate somatic cancer biology, and the two should not be conflated (GeneCards).
• Gene name check. The disease name does not name the gene, so confirm it. SSX1 is the correct gene for SPGFX5.

2. Etiology

• Causal factor. Hemizygous deleterious SSX1 variants in 46,XY men.
• Risk and protective factors. I found no data on genetic modifiers, environmental risk factors, protective factors or gene–environment interactions. Mark these as not available.

3. Phenotypes

All figures come from the six-man series in Liu et al. 2023. Per-patient frequencies and HPO annotations were not retrievable, so confirm them against Table 1 of the paper.

I did not retrieve these HPO IDs from a lookup, so verify them before binding.

• Onset and course. Onset is in adulthood and is detected by infertility. It is presumably stable, but progression has not been reported.
• Other systems. I found no reported syndromic features.
• Quality of life. No data.

4. Genetic and molecular information

• Cohort. Liu et al. screened 536 Chinese men with asthenoteratozoospermia and found six unrelated men with hemizygous SSX1 variants. The paper is Am J Hum Genet 2023;110(3):516–530, doi:10.1016/j.ajhg.2023.01.016. The finding is also summarized in OMIM.
• Variants.
• One reported variant is c.164A>G (p.Tyr55Cys) in family Y1642. Four in-silico predictors (PolyPhen-2, SIFT, CADD, PROVEAN) rate it deleterious.
• Other variants include a 2-bp deletion and a splice-site variant in the C-terminal SSXRD domain, listed as pathogenic in ClinVar without assertion criteria (VCV002444463, VCV002444464, VCV002444465).
• One search summary says the variants include premature stops predicted to cause nonsense-mediated decay. I could not confirm this per variant.
• Replication. A 2026 whole-genome study reported a hemizygous SSX1 splice-donor variant (c.*4+1G>T) in one man with oligoasthenoteratozoospermia, alongside variants in CPNE1 and SPTBN5 (PubMed 42467186; Springer). It is a single case in a multi-gene study.
• Expression. SSX1 expression was significantly reduced in spermatozoa from affected men.
• Functional consequence. Loss of function. There is no evidence for dominant-negative or gain-of-function effects.
• Origin. Germline.
• Gene-disease validity. I found no ClinGen or GenCC classification. Per the repository's rules, leave gene_disease_validity absent rather than assigning a tier.
• Modifiers, epigenetics, chromosomal abnormalities. No data.

5. Environmental information

No environmental, lifestyle or infectious contributors are reported.

6. Mechanism and pathophysiology

Causal chain, with demonstrated and inferred steps marked:

1. Hemizygous loss-of-function variant in X-linked SSX1 in a 46,XY man. Demonstrated.
2. This leads to markedly reduced SSX1 expression in spermatozoa. Demonstrated in patient sperm.
3. This results in impaired spermatogenesis and sperm differentiation. RNA-seq in the animal models suggested SSX1 deficiency affects multiple spermatogenic processes, but I could not retrieve the details. Inferred.
4. This leads to abnormal sperm flagellar and head morphology. Reported.
5. This results in reduced progressive motility (asthenoteratozoospermia) and male infertility. Reported.
6. In the model species, Ssx1 knockdown reproduced the reduced motility and abnormal morphology. Demonstrated in non-human primates and tree shrews.

Protein, pathways and ontology terms. - SSX1 is a primate-specific, cancer-testis-family protein. Its specific molecular function and interaction partners in sperm are not established here. - Candidate GO terms are spermatogenesis (GO:0007283), sperm flagellum assembly and sperm motility. Verify these before use. - Suggested cell types are spermatid (CL:0000018) and spermatozoon (CL:0000019), with the testis and seminiferous tubule (UBERON) as the tissue site.

Omics and other mechanism categories. I did not retrieve single-cell, proteomic or metabolomic data. Immune involvement, metabolic changes and tissue-damage mechanisms are not reported.

7. Anatomical structures affected

• Organ and tissue. The testis and the seminiferous epithelium, specifically germ cell differentiation.
• Subcellular. The sperm flagellum, and probably the head as well. Confirm the subcellular localization of SSX1 from the paper.
• Lateralization. Not applicable.

8. Temporal development

Onset is in adulthood, presenting as infertility. Course and critical periods are not described.

9. Inheritance and population

• Inheritance. X-linked. Males are hemizygous. Carrier mothers are presumed, but I could not confirm this.
• Population. The discovery cohort was Chinese. Prevalence, incidence, founder effects, penetrance, carrier frequency and consanguinity role are unknown.
• Sex. Affects males only.

10. Diagnostics

• Semen analysis. It shows reduced progressive motility plus abnormal morphology, and sperm morphology studies show flagellar abnormalities.
• Genetics. Exome sequencing identified the cases. A gene panel for asthenoteratozoospermia or male infertility should include SSX1.
• Differential diagnosis. Other single-gene causes of MMAF and asthenoteratozoospermia, such as DNAH1 and CFAP-family genes. Another X-linked cause is USP26 (PMC8307012).
• Not applicable or not available. There are no known biomarkers, imaging findings or biopsy features specific to SPGFX5. Newborn and population screening do not apply.

11. Outcome and prognosis

The condition is lifelong male infertility. Reproductive prognosis with assisted reproduction is favorable but not guaranteed. Survival and other complications have not been reported.

12. Treatment

• ICSI (intracytoplasmic sperm injection) is the only reported option. Five of the six men received ICSI, and the authors concluded it is favorable for SSX1-associated asthenoteratozoospermia (PMC10027476; MalaCards). Some couples did not achieve a pregnancy, and the authors partly attributed this to paternal age, oocyte quality or other factors. I could not retrieve per-couple outcomes.
• Suggested NCIT terms. Use a procedure term for assisted reproduction, but only after a lookup. The repository forbids writing NCIT IDs from memory.
• Other therapies. There are no gene therapies, drugs or clinical trials known to me, and no pharmacogenomics data.

13. Prevention

• Genetic counseling. Because the inheritance is X-linked, a male patient's daughters would be obligate carriers. His sons would not inherit his X chromosome. Carrier mothers can pass the variant to sons. This is general X-linked reasoning, not a finding from the paper.
• Other prevention. No primary prevention exists. Prenatal testing or preimplantation genetic testing is possible in principle.

14. Other species and natural disease

I found no OMIA entry or naturally occurring disease. SSX1 is described as primate-specific, so a rodent ortholog may be absent. Confirm this against the paper before relying on it.

15. Model organisms

• Cynomolgus monkey (Macaca fascicularis, NCBITaxon:9541) and tree shrew (Tupaia belangeri, NCBITaxon:37347).
• These are Ssx1 knockdown models made with AAV9 vectors delivered into the seminiferous tubules.
• Both reproduced reduced sperm motility and abnormal morphology (ScienceDirect).
• They are knockdowns, not germline knockouts, and a knockdown is partial and may be transient.
• Evidence from these models is MODEL_ORGANISM. In the schema, link them with modeled_mechanisms and record the knockdown limitation.
• Mouse. I found no useful mouse model. The International Mouse Phenotyping Consortium (IMPC) page for the mouse Ssx1 locus, MGI:107698, exists but I did not read it.

Gaps to close before curating

1. Fetch the Liu et al. 2023 abstract and Table 1 with just fetch-reference. That gives the PMID, the per-patient variants and phenotypes, and the ICSI outcomes.
2. Look up every HPO, GO and CL ID with the repository's term tools.
3. Verify the MONDO ID.
4. Check ClinGen and GenCC for a gene-disease validity classification.

Sources: - MalaCards: Spermatogenic Failure, X-Linked, 5 - OMIM *312820 SSX1 - Liu et al. 2023, AJHG, via PMC - Liu et al. 2023, via ScienceDirect - SSX1, CPNE1 and SPTBN5 whole-genome study, PubMed - Same study, Springer - ClinVar VCV002444463 - ClinVar VCV002444464 - ClinVar VCV002444465 - GeneCards SSX1 - MalaCards (alternate URL) - Disease Ontology DOID:0070596 - GTR C5829558 - MedGen 1840194 - USP26 asthenoteratozoospermia, PMC8307012

Reference Validation

Checked with linkml-reference-validator 0.3.0.

3 of 5 references resolved; the rest could not be looked up either way.

Term Validation

Checked with linkml-term-validator 0.4.5, through the ols: adapter.

Terms the report names something else

These identifiers resolve, so nothing about them looks wrong, and the ontology calls them something unrelated to what the report calls them. That usually means the identifier is not the one the sentence needs:

• HP:0012206 (1 mention) - the report calls it "Asthenozoospermia (reduced progressive motility)"; HP calls it Abnormal sperm motility
• HP:0012864 (1 mention) - the report calls it "Teratozoospermia, including flagellar morphology defects (MMAF-like)"; HP calls it Abnormal sperm morphology
• CL:0000018 (1 mention) - the report calls it "Suggested cell types are spermatid"; CL calls it spermatid

Terms whose name is worth a second look

The report's name for these is recognisably related to the term's own name without being one of them. A loose paraphrase reads the same way as a citation of the wrong sibling term - and so does a related synonym, which the ontology records precisely because it names something adjacent rather than the same thing - so these are listed rather than judged:

• GO:0007283 (1 mention) - the report calls it "Candidate GO terms are spermatogenesis"; GO calls it spermatogenesis

Prefixes with no resolver

Terms carrying these prefixes were not checked either way, because no configured ontology covers them. An unrecognised prefix may name an ontology this run could not reach as easily as one that does not exist, so nothing here is evidence of fabrication: MGI.