Is HAP1 p.Ala284Thr (c.850G>A) pathogenic?

HAP1 p.Ala284Thr (c.850G>A) is classified Uncertain significance in HAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-07). AlphaMissense: likely benign (0.0734); Ultra-rare (popmax 0.0284%, afr).

How common is HAP1 p.Ala284Thr (c.850G>A) in the general population?

HAP1 p.Ala284Thr (c.850G>A) is ultra-rare (popmax 0.0284%, afr) (gnomAD).

What do computational predictors say about HAP1 p.Ala284Thr (c.850G>A)?

AlphaMissense predicts likely benign (score 0.0734) — an in-silico prediction, not a clinical call.

HAP1 p.Ala284Thr

c.850G>A · VCV4268773

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0734 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0284%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0734	likely benign
REVEL	0.017	moderately benign-leaning
SaProt	LLR -7.43	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 -0.36	GERP -2
Regional constraint	o/e 1.05	unconstrained · MANE · 9,930 bp · p 0.16 · regional, not allelic
Overall
CADD	7.883	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0284% African / African-American · 19/67,014 alleles

Filtering AF 0.0185% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0154%

Overall 0.00273% 33/1,207,494 alleles · ultra-rare exomes 14/1,055,346 · genomes 19/152,148 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0284%	3,527
Admixed American	0.00929%	10,759
South Asian	0.00249%	40,148
Remaining individualsnot grpmax-eligible	0.00204%	49,090
European (non-Finnish)	0.000731%	136,818

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.Ala284Thr
Coding: c.850G>A
MANE Select: NM_177977
Type: single nucleotide variant
Location: chr17:41731983 (GRCh38)
Gene constraint: LOEUF 1.31 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.28
Residue 284: the hap1 n-terminal domain; the 'disordered' region

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

Similar variants

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
HAP1 p.Thr66Ala Likely 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-ala284thr (accessed [today's date]).

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