Is HAP1 p.Arg399Gln (c.1196G>A) pathogenic?

HAP1 p.Arg399Gln (c.1196G>A) is classified Likely benign in HAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-15). AlphaMissense: likely benign (0.072); Very rare (popmax 0.00834%, amr).

How common is HAP1 p.Arg399Gln (c.1196G>A) in the general population?

HAP1 p.Arg399Gln (c.1196G>A) is very rare (popmax 0.00834%, amr) (gnomAD).

What do computational predictors say about HAP1 p.Arg399Gln (c.1196G>A)?

AlphaMissense predicts likely benign (score 0.072) — an in-silico prediction, not a clinical call.

HAP1 p.Arg399Gln

c.1196G>A · VCV4831490

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.072 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00834%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.072	likely benign
REVEL	0.038	moderately benign-leaning
SaProt	LLR -5.94	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.27	GERP 0.22, phastCons 0.11
Regional constraint	o/e 1.05	unconstrained · MANE · 9,930 bp · p 0.16 · regional, not allelic
Overall
CADD	3.484	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

Grpmax group 0.00834% Admixed American · 5/59,980 alleles

Filtering AF 0.00323% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00207%

Overall 0.00267% 43/1,611,106 alleles · very rare exomes 41/1,458,928 · genomes 2/152,178 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00834%	11,996
Remaining individualsnot grpmax-eligible	0.0032%	31,232
European (non-Finnish)	0.00288%	34,706
African / African-American	0.00133%	74,934
South Asian	0.0011%	91,078

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: HAP1
Protein: p.Arg399Gln
Coding: c.1196G>A
MANE Select: NM_177977
Type: single nucleotide variant
Location: chr17:41728205 (GRCh38)
Gene constraint: LOEUF 1.31 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.28
Residue 399: the hap1 n-terminal domain

Full HAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

HAP1 p.Arg399Trp Uncertain significance ★ ⚠ same residue
HAP1 p.Arg106Pro Uncertain significance ★★ ⚠ same type
HAP1 p.Cys25Tyr Benign ★★ same type
HAP1 p.Gly604Arg Benign ★★ same type
HAP1 p.Ile496Val Benign ★★ same type
HAP1 p.Leu348= Benign ★★ same type
HAP1 p.Ser616Ter Benign ★★ same type
HAP1 p.Thr441Met Benign ★★ same type

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/hap1-p-arg399gln (accessed [today's date]).

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