Is DCDC2 p.Gln448= (c.1344A>G) pathogenic?

DCDC2 p.Gln448= (c.1344A>G) is classified Likely benign in DCDC2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-12). Ultra-rare (popmax 0.0107%, afr); Associated with autosomal recessive nonsyndromic hearing loss 66.

What condition is associated with DCDC2 p.Gln448= (c.1344A>G)?

DCDC2 p.Gln448= (c.1344A>G) is associated with autosomal recessive nonsyndromic hearing loss 66, isolated neonatal sclerosing cholangitis (ClinVar).

How common is DCDC2 p.Gln448= (c.1344A>G) in the general population?

DCDC2 p.Gln448= (c.1344A>G) is ultra-rare (popmax 0.0107%, afr) (gnomAD).

DCDC2 p.Gln448=

c.1344A>G · rs368603558 · VCV739336

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0107%, afr)

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 1.2	GERP -3.2, phastCons 1
Overall
CADD	6.19	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0107% African / African-American · 8/74,898 alleles

Filtering AF 0.00528% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00381%

Overall 0.000496% 8/1,613,134 alleles · ultra-rare

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.Gln448=
Coding: c.1344A>G
MANE Select: NM_016356
dbSNP: rs368603558
Type: single nucleotide variant
Location: chr6:24174817 (GRCh38)
Gene constraint: LOEUF 1.062 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 63.93 · 1 PDB
Residue 448: a UniProt-annotated variant site (in nsc); 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.Gln448Lys Uncertain significance ★ ⚠ 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-gln448 (accessed [today's date]).

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