Is DCDC2 p.Gln424= (c.1272A>G) pathogenic?

DCDC2 p.Gln424= (c.1272A>G) is classified Likely benign in DCDC2 (ClinVar, Single submitter, 2 submitters; last evaluated 2023-08-04). Very rare (popmax 0.00891%, eas); Associated with autosomal recessive nonsyndromic hearing loss 66.

What condition is associated with DCDC2 p.Gln424= (c.1272A>G)?

DCDC2 p.Gln424= (c.1272A>G) is associated with autosomal recessive nonsyndromic hearing loss 66, isolated neonatal sclerosing cholangitis (ClinVar).

How common is DCDC2 p.Gln424= (c.1272A>G) in the general population?

DCDC2 p.Gln424= (c.1272A>G) is very rare (popmax 0.00891%, eas) (gnomAD).

DCDC2 p.Gln424=

c.1272A>G · rs755258271 · VCV2159957

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00891%, eas)

Conditions

autosomal recessive nonsyndromic hearing loss 66

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 -5.8	GERP -3.5
Overall
CADD	0.068	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00891% East Asian · 4/44,892 alleles

Filtering AF 0.00298% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0018%

Overall 0.000991% 16/1,614,082 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00891%	11,223
African / African-American	0.00534%	18,731
Admixed American	0.005%	20,005
Remaining individualsnot grpmax-eligible	0.0016%	62,486
European (non-Finnish)	0.000339%	295,010

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: DCDC2
Protein: p.Gln424=
Coding: c.1272A>G
MANE Select: NM_016356
dbSNP: rs755258271
Type: single nucleotide variant
Location: chr6:24178384 (GRCh38)
Gene constraint: LOEUF 1.062 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 63.93 · 1 PDB
Residue 424: a UniProt-annotated variant site (in nsc); a UniProt-annotated variant site (in dfnb66; results in ciliary abnormalities including increased ciliary length); the 'disordered' region

Full DCDC2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal recessive nonsyndromic hearing loss 66 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: isolated neonatal sclerosing cholangitis

Similar variants

DCDC2 p.Gln424Pro Pathogenic ⚠ same residue
DCDC2 c.294-2A>G Pathogenic ★★ same condition
DCDC2 c.349-2A>G Pathogenic ★★ same condition
DCDC2 c.705-2A>G Pathogenic ★★ same condition
DCDC2 p.Leu297Ter Pathogenic ★★ same condition
DCDC2 p.Met1Arg Pathogenic/Likely pathogenic ★★ ⚠ same condition
DCDC2 p.Ser128Ter Pathogenic/Likely pathogenic ★★ same condition
DCDC2 p.Ala384Gly 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/dcdc2-p-gln424 (accessed [today's date]).

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