Is CHDH p.Arg28Trp (c.82C>T) pathogenic?

CHDH p.Arg28Trp (c.82C>T) is classified Uncertain significance in CHDH (ClinVar, Single submitter, 1 submitter; last evaluated 2024-01-02). AlphaMissense: likely benign (0.1931); Ultra-rare (popmax 0.0122%, eas).

How common is CHDH p.Arg28Trp (c.82C>T) in the general population?

CHDH p.Arg28Trp (c.82C>T) is ultra-rare (popmax 0.0122%, eas) (gnomAD).

What do computational predictors say about CHDH p.Arg28Trp (c.82C>T)?

AlphaMissense predicts likely benign (score 0.1931) — an in-silico prediction, not a clinical call.

CHDH p.Arg28Trp

c.82C>T · rs776667605 · VCV3144283

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1931 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0122%, eas)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1931	likely benign
REVEL	0.212	benign-leaning
SaProt	LLR -11.26	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.3	GERP 0.48, phastCons 0.34
Regional constraint	o/e 0.99	unconstrained · MANE · 6,228 bp · p 0.86 · regional, not allelic
Overall
CADD	19.19	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 0.0122% East Asian · 5/41,048 alleles

Filtering AF 0.00478% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00308%

Overall 0.0024% 37/1,543,680 alleles · ultra-rare

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.028%	3,566
East Asiangrpmax	0.0122%	8,210
African / African-American	0.00684%	14,611
Remaining individualsnot grpmax-eligible	0.00332%	30,130
European (non-Finnish)	0.00147%	67,810

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: CHDH
Protein: p.Arg28Trp
Coding: c.82C>T
MANE Select: NM_018397
dbSNP: rs776667605
Type: single nucleotide variant
Location: chr3:53823927 (GRCh38)
Gene constraint: LOEUF 1.092 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.84

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

Similar variants

CHDH p.Pro396Leu Uncertain significance ★★ ⚠ same type
CHDH c.704-3C>T Benign ★★ same type
CHDH p.Gly235= Benign ★★ same type
CHDH p.Val45= Benign ★★ same type
CHDH p.Ala13Val Uncertain significance ★ ⚠ same type
CHDH p.Ala170Thr Uncertain significance ★ ⚠ same type
CHDH p.Ala177Thr Uncertain significance ★ ⚠ same type
CHDH p.Ala240Val Uncertain significance ★ ⚠ 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/chdh-p-arg28trp (accessed [today's date]).

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