Is DHDH p.Cys255Tyr (c.764G>A) pathogenic?

DHDH p.Cys255Tyr (c.764G>A) is classified Uncertain significance in DHDH (ClinVar, Single submitter, 1 submitter; last evaluated 2022-08-17). AlphaMissense: likely pathogenic (0.7036); Very rare (popmax 0.00167%, amr).

How common is DHDH p.Cys255Tyr (c.764G>A) in the general population?

DHDH p.Cys255Tyr (c.764G>A) is very rare (popmax 0.00167%, amr) (gnomAD).

What do computational predictors say about DHDH p.Cys255Tyr (c.764G>A)?

AlphaMissense predicts likely pathogenic (score 0.7036) — an in-silico prediction, not a clinical call.

DHDH p.Cys255Tyr

c.764G>A · rs1364170104 · VCV2372025

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.7036 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.7036	likely pathogenic
REVEL	0.207	benign-leaning
SaProt	LLR -10.52	damaging
⇒ AlphaMissense and SaProt call this damaging; REVEL does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.8	phastCons 1
Regional constraint	o/e 0.95	unconstrained · MANE · 11 kb · p 0.26 · regional, not allelic
Overall
CADD	22.1	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 0.00167% Admixed American · 1/59,996 alleles

Filtering AF 0.000542% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000428%

Overall 0.000929% 15/1,613,940 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,996
Remaining individualsnot grpmax-eligible	0.0016%	62,476
African / African-American	0.00133%	74,926
European (non-Finnish)	0.00102%	98,333

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: DHDH
Protein: p.Cys255Tyr
Coding: c.764G>A
MANE Select: NM_014475
dbSNP: rs1364170104
Type: single nucleotide variant
Location: chr19:48944376 (GRCh38)
Gene constraint: LOEUF 1.275 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 98.19

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

Similar variants

DHDH p.Cys255Gly Uncertain significance ★ ⚠ same residue
DHDH p.Ala111Ser Uncertain significance ★ ⚠ same type
DHDH p.Ala134Thr Uncertain significance ★ ⚠ same type
DHDH p.Ala173Thr Uncertain significance ★ ⚠ same type
DHDH p.Ala70Ser Uncertain significance ★ ⚠ same type
DHDH p.Ala89Val Uncertain significance ★ ⚠ same type
DHDH p.Arg107His Uncertain significance ★ ⚠ same type
DHDH p.Arg107Ser 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/dhdh-p-cys255tyr (accessed [today's date]).

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