Is KIT p.Ile277Val (c.829A>G) pathogenic?

KIT p.Ile277Val (c.829A>G) is classified Uncertain significance in KIT (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-10). AlphaMissense: likely benign (0.0887); Very rare (popmax 0.00667%, amr); Associated with hereditary neoplastic syndrome.

What condition is associated with KIT p.Ile277Val (c.829A>G)?

KIT p.Ile277Val (c.829A>G) is associated with hereditary neoplastic syndrome, gastrointestinal stromal tumor (ClinVar).

How common is KIT p.Ile277Val (c.829A>G) in the general population?

KIT p.Ile277Val (c.829A>G) is very rare (popmax 0.00667%, amr) (gnomAD).

What do computational predictors say about KIT p.Ile277Val (c.829A>G)?

AlphaMissense predicts likely benign (score 0.0887) — an in-silico prediction, not a clinical call.

KIT p.Ile277Val

c.829A>G · rs757547974 · VCV409751

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

AlphaMissense

likely benign

0.0887 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00667%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.0887	likely benign
REVEL	0.06	moderately benign-leaning
SaProt	LLR -8.89	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.2	GERP -1.1, phastCons 1
Regional constraint	o/e 0.67	unconstrained · MANE · 32 kb · p 3.4e-16 · regional, not allelic
Overall
CADD	14.21	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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

Grpmax group 0.00667% Admixed American · 4/59,996 alleles

Filtering AF 0.00226% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00135%

Overall 0.000744% 12/1,613,436 alleles · very rare exomes 8/1,461,272 · genomes 4/152,164 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00667%	14,999
South Asian	0.0022%	45,539
European (non-Finnish)	0.000509%	196,580

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: KIT
Protein: p.Ile277Val
Coding: c.829A>G
MANE Select: NM_000222
dbSNP: rs757547974
Type: single nucleotide variant
Location: chr4:54703796 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 78.52 · 65 PDB
Residue 277: a β-strand; the ig-like c2-type 3 domain

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

Disease context

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

Also linked: gastrointestinal stromal tumor

Similar variants

KIT p.Ile277Leu Uncertain significance ★★ ⚠ same residue
KIT p.Ala621Thr Pathogenic/Likely pathogenic ★★ same condition
KIT p.Asp820Tyr Pathogenic ★★ same condition
KIT p.Gln190Ter Pathogenic ★★ same condition
KIT p.Leu576Pro Pathogenic/Likely pathogenic ★★ same condition
KIT p.Lys642Glu Pathogenic ★★ same condition
KIT p.Trp557Arg Pathogenic/Likely pathogenic ★★ same condition
KIT p.Val559Ala Pathogenic/Likely pathogenic ★★ 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/kit-p-ile277val (accessed [today's date]).

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