Is HRAS p.Cys51Arg (c.151T>C) pathogenic?

HRAS p.Cys51Arg (c.151T>C) is classified Uncertain significance in HRAS (ClinVar, Single submitter, 1 submitter; last evaluated 2025-05-05). AlphaMissense: likely pathogenic (0.9975); Absent from gnomAD v4.1; Associated with Costello syndrome.

What condition is associated with HRAS p.Cys51Arg (c.151T>C)?

HRAS p.Cys51Arg (c.151T>C) is associated with Costello syndrome (ClinVar).

How common is HRAS p.Cys51Arg (c.151T>C) in the general population?

HRAS p.Cys51Arg (c.151T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about HRAS p.Cys51Arg (c.151T>C)?

AlphaMissense predicts likely pathogenic (score 0.9975) — an in-silico prediction, not a clinical call.

HRAS p.Cys51Arg

c.151T>C · rs1183526920 · VCV2129189

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9975 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Costello syndrome

Computational evidence

Protein change
AlphaMissense	0.9975	likely pathogenic
REVEL	0.772	pathogenic-leaning
SaProt	LLR -14.40	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.9, phastCons 1
Regional constraint	o/e 0.65	unconstrained · MANE · 435 bp · p 0.0016 · regional, not allelic
Overall
CADD	23.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: HRAS
Protein: p.Cys51Arg
Coding: c.151T>C
MANE Select: NM_005343
dbSNP: rs1183526920
Type: single nucleotide variant
Location: chr11:533905 (GRCh38)
Gene constraint: LOEUF 0.893 · pLI 0.02 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 92.50 · 256 PDB
Residue 51: a β-strand

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

Disease context

Costello syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

HRAS p.Cys51= Likely benign ★★ same residue
HRAS p.Ala59Thr Likely pathogenic ★★★ same condition
HRAS p.Gly12Ser Pathogenic ★★★ same condition
HRAS p.Gly13Cys Pathogenic ★★★ same condition
HRAS p.Lys117Arg Pathogenic ★★★ same condition
HRAS p.Thr58Ile Pathogenic ★★★ same condition
HRAS p.Gly138Ser Uncertain significance ★★★ ⚠ same condition
HRAS p.Ile93Val 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/hras-p-cys51arg (accessed [today's date]).

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