Is DCDC2 p.Thr408= (c.1224C>T) pathogenic?

DCDC2 p.Thr408= (c.1224C>T) is classified Likely benign in DCDC2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-12-10). Ultra-rare (popmax 0.0132%, sas); Associated with autosomal recessive nonsyndromic hearing loss 66.

What condition is associated with DCDC2 p.Thr408= (c.1224C>T)?

DCDC2 p.Thr408= (c.1224C>T) is associated with autosomal recessive nonsyndromic hearing loss 66, isolated neonatal sclerosing cholangitis (ClinVar).

How common is DCDC2 p.Thr408= (c.1224C>T) in the general population?

DCDC2 p.Thr408= (c.1224C>T) is ultra-rare (popmax 0.0132%, sas) (gnomAD).

DCDC2 p.Thr408=

c.1224C>T · rs763861048 · VCV2196211

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0132%, sas)

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 -6.3	GERP -3.5
Overall
CADD	0.302	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0132% South Asian · 12/91,082 alleles

Filtering AF 0.00751% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00593%

Overall 0.00143% 23/1,613,974 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0132%	7,590
Admixed American	0.00333%	29,996
African / African-American	0.00267%	37,440
Remaining individualsnot grpmax-eligible	0.0016%	62,486
Finnishnot grpmax-eligible	0.00156%	64,016
European (non-Finnish)	0.000424%	236,007

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.Thr408=
Coding: c.1224C>T
MANE Select: NM_016356
dbSNP: rs763861048
Type: single nucleotide variant
Location: chr6:24178432 (GRCh38)
Gene constraint: LOEUF 1.062 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 63.93 · 1 PDB
Residue 408: 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.Thr408Ile 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-thr408 (accessed [today's date]).

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