GPR173
Chr XG protein-coupled receptor 173
Also known as: SREB3
The protein is a G-protein coupled receptor that responds to phoenixin peptides and mediates their effects on gonadotropin-releasing hormone signaling in the hypothalamus and pituitary, as well as granulosa cell proliferation in the ovary. Mutations in this gene have been associated with hypogonadotropic hypogonadism, which involves impaired reproductive hormone function. The gene is highly constrained against loss-of-function variants (pLI = 0.87), suggesting that complete loss of protein function is poorly tolerated.
Population Genetics & Constraint
gnomAD v4 — loss-of-function & missense intolerance
More LoF-intolerant than ~75% of genes
Moderately missense-constrained (top ~2.5%)
This gene has evidence for multiple mechanisms of pathogenicity (gain-of-function and loss-of-function). Both the Badonyi & Marsh prediction and the broader genomic evidence point to gain-of-function as the predominant mechanism. Different variants in this gene may act through different mechanisms — interpret in context of the specific variant.
Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.
Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312. Mechanism ranking also informed by gnomAD constraint, ClinVar, and ClinGen data.
ClinVar Variant Classifications
100 submitted variants in ClinVar
Classification Summary
Curated Variants Distribution
Classified variants from ClinVar · 5 ACMG categories
| Classification | LoF | Missense + Inframe | Non-coding | Synonymous | Total |
|---|---|---|---|---|---|
Pathogenic | 0 | 0 | 57 | 0 | 57 |
Likely Pathogenic | 0 | 0 | 4 | 0 | 4 |
VUS | 0 | 24 | 3 | 0 | 27 |
Likely Benign | 0 | 0 | 0 | 0 | 0 |
Benign | 0 | 0 | 0 | 0 | 0 |
Conflicting | — | 1 | |||
| Total | 0 | 24 | 64 | 0 | 89 |
LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly
View in ClinVar →Protein Context — Lollipop Plot
GPR173 · protein map & ClinVar variants
Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.
3D Protein StructureAlphaFold
External Resources
Links to major genomics databases and tools
Clinical Trials
Active and recruiting trials from ClinicalTrials.gov
No active trials found for this gene.
Search ClinicalTrials.gov →External Resources
Links to major genomics databases and tools