Is STS p.Arg419Cys (c.1255C>T) pathogenic?

STS p.Arg419Cys (c.1255C>T) is classified Uncertain significance in STS (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-22). AlphaMissense: likely benign (0.1209); Very rare (popmax 0.00593%, eas); Associated with Inborn genetic diseases.

What condition is associated with STS p.Arg419Cys (c.1255C>T)?

STS p.Arg419Cys (c.1255C>T) is associated with Inborn genetic diseases (ClinVar).

How common is STS p.Arg419Cys (c.1255C>T) in the general population?

STS p.Arg419Cys (c.1255C>T) is very rare (popmax 0.00593%, eas) (gnomAD).

What do computational predictors say about STS p.Arg419Cys (c.1255C>T)?

AlphaMissense predicts likely benign (score 0.1209) — an in-silico prediction, not a clinical call.

STS p.Arg419Cys

c.1255C>T · VCV4177203

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1209 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00593%, eas)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1209	likely benign
REVEL	0.357	indeterminate
SaProt	LLR -11.09	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.2	GERP 4.4
Regional constraint	o/e 1.16	unconstrained · MANE · 25 kb · p 0.038 · regional, not allelic
Overall
CADD	17.01	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R424C vs ClinVar R419C) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00593% East Asian · 2/33,741 alleles

Filtering AF 0.000982% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000367%

Overall 0.000413% 5/1,209,483 alleles · very rare exomes 3/1,097,862 · genomes 2/111,621 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00593%	16,870
South Asian	0.00352%	28,394
Remaining individualsnot grpmax-eligible	0.0021%	47,567

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: STS
Protein: p.Arg419Cys
Coding: c.1255C>T
MANE Select: NM_001320752
Type: single nucleotide variant
Location: chrX:7333999 (GRCh38)
Structure: AlphaFold pLDDT 94.31 · 2 PDB

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

STS p.Arg419His Uncertain significance ★ ⚠ same residue
STS p.Arg381Ser Uncertain significance ★★ ⚠ same condition
STS p.Asp397Asn Uncertain significance ★★ ⚠ same condition
STS p.Arg578His Benign/Likely benign ★★ same condition
STS c.943+5G>A Conflicting classifications of pathogenicity ★ same condition
STS p.Ala295Val Uncertain significance ★ ⚠ same condition
STS p.Ala529Val Uncertain significance ★ ⚠ same condition
STS p.Arg179Ser Uncertain significance ★ ⚠ 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/sts-p-arg419cys (accessed [today's date]).

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