Is SRD5A2 p.Arg103= (c.307C>A) pathogenic?

SRD5A2 p.Arg103= (c.307C>A) is classified Likely benign in SRD5A2 (ClinVar, Single submitter, 2 submitters; last evaluated 2025-11-09). Rare (popmax 0.112%, afr); Associated with 46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency.

What condition is associated with SRD5A2 p.Arg103= (c.307C>A)?

SRD5A2 p.Arg103= (c.307C>A) is associated with 46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency (ClinVar).

How common is SRD5A2 p.Arg103= (c.307C>A) in the general population?

SRD5A2 p.Arg103= (c.307C>A) is rare (popmax 0.112%, afr) (gnomAD).

SRD5A2 p.Arg103=

Q: How is 46,XY difference of sex development due to 5-alpha-reductase 2 deficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.307C>A · rs267599353 · VCV2709890

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

rare (popmax 0.112%, afr)

Conditions

46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.4	GERP -0.78, phastCons 1
Overall
CADD	3.629	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.112% African / African-American · 84/74,914 alleles

Filtering AF 0.0927% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0856%

Overall 0.00617% 99/1,603,408 alleles · rare exomes 54/1,451,114 · genomes 45/152,294 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.112%	892
Middle Eastern	0.0167%	6,004
Remaining individualsnot grpmax-eligible	0.0129%	7,777
Admixed American	0.0017%	58,792
European (non-Finnish)	0.000426%	234,998

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: SRD5A2
Protein: p.Arg103=
Coding: c.307C>A
MANE Select: NM_000348
dbSNP: rs267599353
Type: single nucleotide variant
Location: chr2:31533741 (GRCh38)
Gene constraint: LOEUF 1.717 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 94.56 · 1 PDB
Residue 103: a UniProt-annotated variant site (found in individual with micropenis)

Full SRD5A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

46,XY disorder of sex development due to 5-alpha-reductase 2 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For 46,XY difference of sex development due to 5-alpha-reductase 2 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Childhood, Infancy, Neonatal

Similar variants

SRD5A2 p.Arg103Ter Pathogenic ★★ same residue
SRD5A2 c.282-2A>G Pathogenic ★★ same condition
SRD5A2 c.698+1G>T Pathogenic/Likely pathogenic ★★ same condition
SRD5A2 p.Ala207Asp Pathogenic/Likely pathogenic ★★ same condition
SRD5A2 p.Ala228Thr Pathogenic/Likely pathogenic ★★ same condition
SRD5A2 p.Ala65Pro Pathogenic/Likely pathogenic ★★ same condition
SRD5A2 p.Arg145Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
SRD5A2 p.Arg227Gln Pathogenic/Likely pathogenic ★★ ⚠ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/srd5a2-p-arg103 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown