Is KIT p.Ser877Cys (c.2630C>G) pathogenic?

KIT p.Ser877Cys (c.2630C>G) is classified Uncertain significance in KIT (ClinVar, Single submitter, 1 submitter; last evaluated 2021-12-10). AlphaMissense: likely benign (0.1977); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with KIT p.Ser877Cys (c.2630C>G)?

KIT p.Ser877Cys (c.2630C>G) is associated with hereditary neoplastic syndrome (ClinVar).

How common is KIT p.Ser877Cys (c.2630C>G) in the general population?

KIT p.Ser877Cys (c.2630C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about KIT p.Ser877Cys (c.2630C>G)?

AlphaMissense predicts likely benign (score 0.1977) — an in-silico prediction, not a clinical call.

KIT p.Ser877Cys

c.2630C>G · rs1722943323 · VCV1794049

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1977 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.1977	likely benign
REVEL	0.65	pathogenic-leaning
SaProt	LLR -9.78	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 1.5, phastCons 1
Regional constraint	o/e 0.46	unconstrained · MANE · 4,810 bp · p 2.2e-10 · regional, not allelic
Overall
CADD	28.1	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: KIT
Protein: p.Ser877Cys
Coding: c.2630C>G
MANE Select: NM_000222
dbSNP: rs1722943323
Type: single nucleotide variant
Location: chr4:54736754 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 78.52 · 65 PDB
Residue 877: the protein kinase domain; an α-helix

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

Similar variants

KIT p.Ser877Phe Uncertain significance ★★ ⚠ same residue
KIT p.Ser877Tyr Uncertain significance ★ same residue
KIT p.Ser877= Likely benign ★ same residue
KIT p.Asp820Tyr Pathogenic ★★ same condition
KIT p.Leu576Pro Pathogenic/Likely pathogenic ★★ same condition
KIT p.Trp557Arg Pathogenic/Likely pathogenic ★★ same condition
KIT p.Val559Ala Pathogenic/Likely pathogenic ★★ same condition
KIT c.1232-3T>C 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/kit-p-ser877cys (accessed [today's date]).

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