Is KIT p.Thr661Ser (c.1982C>G) pathogenic?

KIT p.Thr661Ser (c.1982C>G) is classified Uncertain significance in KIT (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-04). AlphaMissense: likely pathogenic (0.971); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with KIT p.Thr661Ser (c.1982C>G)?

KIT p.Thr661Ser (c.1982C>G) is associated with hereditary neoplastic syndrome (ClinVar).

How common is KIT p.Thr661Ser (c.1982C>G) in the general population?

KIT p.Thr661Ser (c.1982C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about KIT p.Thr661Ser (c.1982C>G)?

AlphaMissense predicts likely pathogenic (score 0.971) — an in-silico prediction, not a clinical call.

KIT p.Thr661Ser

c.1982C>G · VCV4645428

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.971 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.971	likely pathogenic
REVEL	0.594	indeterminate
SaProt	LLR -9.14	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 2.6, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 4,114 bp · p 4.1e-05 · regional, not allelic
Overall
CADD	27.1	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.Thr661Ser
Coding: c.1982C>G
MANE Select: NM_000222
Type: single nucleotide variant
Location: chr4:54728113 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 78.52 · 65 PDB
Residue 661: the protein kinase 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

Similar variants

KIT p.Thr661= 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
KIT c.1647+5C>A Uncertain significance ★★ same condition
KIT c.1647+5C>G 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-thr661ser (accessed [today's date]).

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