Is DCX p.Val136Met (c.406G>A) pathogenic?

DCX p.Val136Met (c.406G>A) is classified Uncertain significance in DCX (ClinVar, Single submitter, 1 submitter; last evaluated 2025-11-12). AlphaMissense: likely pathogenic (0.6823); Absent from gnomAD v4.1; Associated with lissencephaly type 1 due to doublecortin gene mutation.

What condition is associated with DCX p.Val136Met (c.406G>A)?

DCX p.Val136Met (c.406G>A) is associated with lissencephaly type 1 due to doublecortin gene mutation (ClinVar).

How common is DCX p.Val136Met (c.406G>A) in the general population?

DCX p.Val136Met (c.406G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about DCX p.Val136Met (c.406G>A)?

AlphaMissense predicts likely pathogenic (score 0.6823) — an in-silico prediction, not a clinical call.

DCX p.Val136Met

Q: How is Lissencephaly type 1 due to doublecortin gene mutation inherited?

Typically X-linked recessive (Orphanet). A genetic counselor can assess individual risk for a family.

c.406G>A · VCV4856291

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6823 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

lissencephaly type 1 due to doublecortin gene mutation

Computational evidence

Protein change
AlphaMissense	0.6823	likely pathogenic
REVEL	0.518	indeterminate
SaProt	LLR -11.01	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP -0.94, phastCons 1
Regional constraint	o/e 0.31	constrained · MANE · 77 kb · p 4.4e-24 · regional, not allelic
Overall
CADD	24.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: DCX
Protein: p.Val136Met
Coding: c.406G>A
MANE Select: NM_001195553
Type: single nucleotide variant
Location: chrX:111401289 (GRCh38)
Structure: AlphaFold pLDDT 67.19 · 14 PDB
Residue 136: the doublecortin 1 domain

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

Disease context

lissencephaly type 1 due to doublecortin gene mutation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Lissencephaly type 1 due to doublecortin gene mutation (Orphanet):

Inheritance: X-linked recessive
Onset: Adolescent, Childhood, Infancy, Neonatal

Similar variants

DCX p.Val136Leu Uncertain significance ★★ ⚠ same residue
DCX c.809-1G>A Pathogenic/Likely pathogenic ★★ same condition
DCX p.Arg178Cys Pathogenic/Likely pathogenic ★★ same condition
DCX p.Arg186Leu Pathogenic/Likely pathogenic ★★ same condition
DCX p.Arg192Trp Pathogenic/Likely pathogenic ★★ same condition
DCX p.Arg196Cys Pathogenic ★★ same condition
DCX p.Arg196His Pathogenic/Likely pathogenic ★★ same condition
DCX p.Arg272Ter Pathogenic ★★ 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/dcx-p-val136met (accessed [today's date]).

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