Is MAP2K2 p.Asp140= (c.420C>T) pathogenic?

MAP2K2 p.Asp140= (c.420C>T) is classified Benign in MAP2K2 (ClinVar, Expert panel, 11 submitters; last evaluated 2017-05-09). Rare (popmax 0.548%, eas); Associated with RASopathy.

What condition is associated with MAP2K2 p.Asp140= (c.420C>T)?

MAP2K2 p.Asp140= (c.420C>T) is associated with RASopathy, cardiofaciocutaneous syndrome 4, Noonan syndrome and Noonan-related syndrome (ClinVar).

How common is MAP2K2 p.Asp140= (c.420C>T) in the general population?

MAP2K2 p.Asp140= (c.420C>T) is rare (popmax 0.548%, eas) (gnomAD).

MAP2K2 p.Asp140=

c.420C>T · rs369925884 · VCV46235

Benign Expert panel

Classification

Benign

ClinVar

Review

Expert panel ★★★☆

ClinVar · 11 submitters

gnomAD v4.1

Rare

rare (popmax 0.548%, eas)

Conditions

RASopathy

ClinGen expert panel — RASopathy VCEP

Benign for RASopathy. Applied ACMG criteria (verbatim):

BA1

Curation rationale (ClinGen, verbatim)

The filtering allele frequency of the c.420C>T (p.Asp140=) variant in the MAP2K2 gene is 0.271% (32/8604) of East Asian chromosomes by the Exome Aggregation Consortium, which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen RASopathy Expert Panel (BA1; PMID:29493581)

ClinGen Evidence Repository → · reported verbatim, not re-tallied by Sugi Variant.

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 -3.8	GERP -3.9
Overall
CADD	8.521	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.548% East Asian · 246/44,888 alleles

Filtering AF 0.492% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.47%

Overall 0.0317% 512/1,613,866 alleles · rare exomes 487/1,461,606 · genomes 25/152,260 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.548%	182
European (non-Finnish)	0.0206%	4,856
Remaining individualsnot grpmax-eligible	0.016%	6,250
Admixed American	0.0133%	7,501
Finnishnot grpmax-eligible	0.00471%	21,253
African / African-American	0.00133%	75,032
South Asian	0.0011%	91,088

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: MAP2K2
Protein: p.Asp140=
Coding: c.420C>T
MANE Select: NM_030662
dbSNP: rs369925884
Type: single nucleotide variant
Location: chr19:4110539 (GRCh38)
Gene constraint: LOEUF 0.858 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 82.54 · 3 PDB
Residue 140: the protein kinase domain; a β-strand

Full MAP2K2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Also linked: cardiofaciocutaneous syndrome 4 Noonan syndrome and Noonan-related syndrome

Similar variants

MAP2K2 p.Asp140Ala Uncertain significance ★ ⚠ same residue
MAP2K2 p.Glu207Lys Likely pathogenic ★★★ same condition
MAP2K2 p.Phe57Cys Pathogenic ★★★ same condition
MAP2K2 p.Phe57Val Pathogenic ★★★ same condition
MAP2K2 p.Pro128Gln Pathogenic ★★★ same condition
MAP2K2 p.Tyr134Cys Likely pathogenic ★★★ same condition
MAP2K2 p.Tyr134His Pathogenic ★★★ same condition
MAP2K2 p.Arg231His 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/map2k2-p-asp140 (accessed [today's date]).

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