Is KAT6B p.Arg158= (c.474C>T) pathogenic?

KAT6B p.Arg158= (c.474C>T) is classified Likely benign in KAT6B (ClinVar, Single submitter, 1 submitter; last evaluated 2023-02-01). Ultra-rare (popmax 0.0493%, mid); Associated with genitopatellar syndrome.

What condition is associated with KAT6B p.Arg158= (c.474C>T)?

KAT6B p.Arg158= (c.474C>T) is associated with genitopatellar syndrome (ClinVar).

How common is KAT6B p.Arg158= (c.474C>T) in the general population?

KAT6B p.Arg158= (c.474C>T) is ultra-rare (popmax 0.0493%, mid) (gnomAD).

KAT6B p.Arg158=

c.474C>T · rs184609018 · VCV2730420

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0493%, mid)

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 -0.012	GERP -4.2, phastCons 0.001
Overall
CADD	1.644	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0493% Middle Eastern · 3/6,082 alleles

Filtering AF 0.0134% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00716%

Overall 0.000744% 12/1,613,290 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0493%	2,027
East Asian	0.00668%	14,965
South Asian	0.00329%	30,357
Remaining individualsnot grpmax-eligible	0.0032%	31,221
European (non-Finnish)	8.48e-05%	1,179,654

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: KAT6B
Protein: p.Arg158=
Coding: c.474C>T
MANE Select: NM_012330
dbSNP: rs184609018
Type: single nucleotide variant
Location: chr10:74843331 (GRCh38)
Gene constraint: LOEUF 0.098 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 49.67 · 3 PDB
Residue 158: the h15 domain; an α-helix

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 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
KAT6B p.Ala1498Ser 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-arg158 (accessed [today's date]).

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