Is KIT p.Ser278fs (c.828_832dup) pathogenic?

KIT p.Ser278fs (c.828832dup) is classified Pathogenic in KIT (ClinVar, Single submitter, 1 submitter; last evaluated 2022-05-08). Absent from gnomAD; Associated with gastrointestinal stromal tumor.

What condition is associated with KIT p.Ser278fs (c.828_832dup)?

KIT p.Ser278fs (c.828_832dup) is associated with gastrointestinal stromal tumor (ClinVar).

How common is KIT p.Ser278fs (c.828_832dup) in the general population?

KIT p.Ser278fs (c.828_832dup) is absent from gnomAD (gnomAD).

How is Gastrointestinal stromal tumor inherited?

Typically Autosomal dominant, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

KIT p.Ser278fs

c.828_832dup · rs2475469406 · VCV2126350

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

gastrointestinal stromal tumor

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 5 of 21
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 0.48	GERP 1.6, phastCons 0.057

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

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: KIT
Protein: p.Ser278fs
Coding: c.828_832dup
MANE Select: NM_000222
dbSNP: rs2475469406
Type: Duplication
Location: chr4:54703794 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 78.52 · 65 PDB
Residue 278: a β-strand; a disulfide bond; the ig-like c2-type 3 domain

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

Disease context

gastrointestinal stromal tumor — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Gastrointestinal stromal tumor (Orphanet):

Inheritance: Autosomal dominant, Not applicable
Onset: Adolescent, Adult, Childhood
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

KIT p.Ser278Ile Uncertain significance ★★ ⚠ same residue
KIT p.Leu707_Ser713dup Uncertain significance ★★ same condition
KIT p.Val422dup Uncertain significance ★★ same condition
KIT c.338-6dup Likely benign ★★ same condition
KIT c.67+5_67+18dup Likely benign ★★ same condition
KIT p.Ala597fs Pathogenic ★ same condition
KIT p.Arg588_Leu589insProGlnLeuProTyrAspHisLysTrpGluPheProArgAsnArg Likely pathogenic ★ same condition
KIT p.Cys428fs 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-ser278fs (accessed [today's date]).

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