Is KAT6B p.Ser703= (c.2109T>G) pathogenic?

KAT6B p.Ser703= (c.2109T>G) is classified Likely benign in KAT6B (ClinVar, Single submitter, 1 submitter; last evaluated 2022-09-23). Absent from gnomAD v4.1; Associated with genitopatellar syndrome.

What condition is associated with KAT6B p.Ser703= (c.2109T>G)?

KAT6B p.Ser703= (c.2109T>G) is associated with genitopatellar syndrome (ClinVar).

How common is KAT6B p.Ser703= (c.2109T>G) in the general population?

KAT6B p.Ser703= (c.2109T>G) is absent from gnomAD v4.1 (gnomAD).

KAT6B p.Ser703=

c.2109T>G · rs2548964981 · VCV2165804

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

genitopatellar 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 2.8	GERP 0.47, phastCons 1
Overall
CADD	9.845	PHRED · no single calibrated threshold — expert panels disagree

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: KAT6B
Protein: p.Ser703=
Coding: c.2109T>G
MANE Select: NM_012330
dbSNP: rs2548964981
Type: single nucleotide variant
Location: chr10:74977431 (GRCh38)
Gene constraint: LOEUF 0.098 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 49.67 · 3 PDB
Residue 703: the 'negatively regulates hat activity' region

Full KAT6B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

Similar variants

KAT6B p.Ser703Pro Uncertain significance ★ ⚠ same residue
KAT6B c.3664+1G>A Pathogenic ★★ same condition
KAT6B p.Arg1058Ter Pathogenic ★★ same condition
KAT6B p.Arg1797Ter Pathogenic ★★ same condition
KAT6B p.Gln1752Ter Pathogenic ★★ same condition
KAT6B c.2373+6C>A Uncertain significance ★★ same condition
KAT6B c.2374-3T>C Uncertain significance ★★ same condition
KAT6B p.Ala1317Thr 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/kat6b-p-ser703 (accessed [today's date]).

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