Is RRAS p.Asp180= (c.540C>T) pathogenic?

RRAS p.Asp180= (c.540C>T) is classified Likely benign in RRAS (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-02-18). Ultra-rare (popmax 0.0242%, afr); Associated with Noonan syndrome.

What condition is associated with RRAS p.Asp180= (c.540C>T)?

RRAS p.Asp180= (c.540C>T) is associated with Noonan syndrome (ClinVar).

How common is RRAS p.Asp180= (c.540C>T) in the general population?

RRAS p.Asp180= (c.540C>T) is ultra-rare (popmax 0.0242%, afr) (gnomAD).

RRAS p.Asp180=

c.540C>T · rs781054110 · VCV1153600

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0242%, afr)

Conditions

Noonan syndrome

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 -5	GERP -3.4
Overall
CADD	3.002	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0242% African / African-American · 18/74,450 alleles

Filtering AF 0.0156% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0129%

Overall 0.00169% 27/1,594,460 alleles · ultra-rare exomes 15/1,442,542 · genomes 12/151,918 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0242%	4,136
Remaining individualsnot grpmax-eligible	0.00816%	12,260
East Asian	0.00452%	22,123
European (non-Finnish)	0.000172%	582,642

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: RRAS
Protein: p.Asp180=
Coding: c.540C>T
MANE Select: NM_006270
dbSNP: rs781054110
Type: single nucleotide variant
Location: chr19:49635766 (GRCh38)
Gene constraint: LOEUF 1.175 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 86.79 · 2 PDB
Residue 180: an α-helix

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

Disease context

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

Similar variants

RRAS p.Ala109Thr Uncertain significance ★★ ⚠ same condition
RRAS p.Ala162Thr Uncertain significance ★★ ⚠ same condition
RRAS p.Ala205Val Uncertain significance ★★ ⚠ same condition
RRAS p.Ala85Val Uncertain significance ★★ ⚠ same condition
RRAS p.Arg113Gln Uncertain significance ★★ ⚠ same condition
RRAS p.Arg128Gln Uncertain significance ★★ ⚠ same condition
RRAS p.Arg132Cys Uncertain significance ★★ same condition
RRAS p.Arg132His 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/rras-p-asp180 (accessed [today's date]).

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