Is KIT p.Asn330= (c.990T>C) pathogenic?

KIT p.Asn330= (c.990T>C) is classified Likely benign in KIT (ClinVar, Multiple submitters, 2 submitters; last evaluated 2022-12-20). Very rare (popmax 0.00221%, sas); Associated with hereditary neoplastic syndrome.

What condition is associated with KIT p.Asn330= (c.990T>C)?

KIT p.Asn330= (c.990T>C) is associated with hereditary neoplastic syndrome, gastrointestinal stromal tumor (ClinVar).

How common is KIT p.Asn330= (c.990T>C) in the general population?

KIT p.Asn330= (c.990T>C) is very rare (popmax 0.00221%, sas) (gnomAD).

KIT p.Asn330=

c.990T>C · rs529920663 · VCV1768589

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00221%, sas)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -4.5	GERP -4.9
Overall
CADD	4.908	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00221% South Asian · 2/90,490 alleles

Filtering AF 0.000367% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000137%

Overall 0.000315% 5/1,589,470 alleles · very rare exomes 3/1,437,218 · genomes 2/152,252 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00221%	45,245
European (non-Finnish)	0.000259%	385,931

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.Asn330=
Coding: c.990T>C
MANE Select: NM_000222
dbSNP: rs529920663
Type: single nucleotide variant
Location: chr4:54707162 (GRCh38)
Gene constraint: LOEUF 0.24 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 78.52 · 65 PDB
Residue 330: the ig-like c2-type 4 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.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
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-asn330 (accessed [today's date]).

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