Is MAP2K2 p.Arg185Ter (c.553C>T) pathogenic?

MAP2K2 p.Arg185Ter (c.553C>T) is classified Uncertain significance in MAP2K2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-10-26). Very rare (popmax 0.00137%, nfe); Associated with RASopathy.

What condition is associated with MAP2K2 p.Arg185Ter (c.553C>T)?

MAP2K2 p.Arg185Ter (c.553C>T) is associated with RASopathy, cardiofaciocutaneous syndrome 4 (ClinVar).

How common is MAP2K2 p.Arg185Ter (c.553C>T) in the general population?

MAP2K2 p.Arg185Ter (c.553C>T) is very rare (popmax 0.00137%, nfe) (gnomAD).

MAP2K2 p.Arg185Ter

c.553C>T · rs1390219813 · VCV837134

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00137%, nfe)

Conditions

RASopathy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 5 of 11
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.1	GERP -2.6, phastCons 1
Overall
CADD	49.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00137% European (non-Finnish) · 16/1,167,012 alleles

Filtering AF 0.000812% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000657%

Overall 0.00107% 17/1,585,936 alleles · very rare exomes 16/1,433,822 · genomes 1/152,114 · joint denominator

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.00163%	61,422
European (non-Finnish)grpmax	0.00137%	72,938

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Arg185Ter
Coding: c.553C>T
MANE Select: NM_030662
dbSNP: rs1390219813
Type: single nucleotide variant
Location: chr19:4101256 (GRCh38)
Gene constraint: LOEUF 0.858 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 82.54 · 3 PDB
Residue 185: the protein kinase domain; an α-helix

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

Similar variants

MAP2K2 p.Arg185Gln 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-arg185ter (accessed [today's date]).

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