Is COLQ p.Pro203Ser (c.607C>T) pathogenic?

COLQ p.Pro203Ser (c.607C>T) is classified Uncertain significance in COLQ (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-12). AlphaMissense: likely benign (0.1492); Absent from gnomAD v4.1; Associated with congenital myasthenic syndrome 5.

What condition is associated with COLQ p.Pro203Ser (c.607C>T)?

COLQ p.Pro203Ser (c.607C>T) is associated with congenital myasthenic syndrome 5 (ClinVar).

How common is COLQ p.Pro203Ser (c.607C>T) in the general population?

COLQ p.Pro203Ser (c.607C>T) is absent from gnomAD v4.1 (gnomAD).

How is Congenital myasthenic syndrome inherited?

Typically Autosomal dominant, Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about COLQ p.Pro203Ser (c.607C>T)?

AlphaMissense predicts likely benign (score 0.1492) — an in-silico prediction, not a clinical call.

COLQ p.Pro203Ser

c.607C>T · rs2062334452 · VCV901184

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1492 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

congenital myasthenic syndrome 5

Computational evidence

Protein change
AlphaMissense	0.1492	likely benign
REVEL	0.573	indeterminate
SaProt	LLR -7.87	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.3, phastCons 1
Regional constraint	o/e 1.04	unconstrained · MANE · 70 kb · p 0.34 · regional, not allelic
Overall
CADD	23.7	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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: COLQ
Protein: p.Pro203Ser
Coding: c.607C>T
MANE Select: NM_005677
dbSNP: rs2062334452
Type: single nucleotide variant
Location: chr3:15474029 (GRCh38)
Gene constraint: LOEUF 0.902 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 55.25 · 2 PDB
Residue 203: the collagen-like 1 domain; a UniProt-annotated variant site (in cms5; pathogenic); the 'disordered' region

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

Disease context

congenital myasthenic syndrome 5 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Congenital myasthenic syndrome (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

COLQ c.1195+1G>A Pathogenic ★★ same condition
COLQ c.1298+3A>G Pathogenic ★★ same condition
COLQ c.219+1G>C Pathogenic ★★ same condition
COLQ c.220-1G>A Pathogenic/Likely pathogenic ★★ same condition
COLQ c.393+1G>A Pathogenic ★★ same condition
COLQ c.529-2A>G Pathogenic/Likely pathogenic ★★ same condition
COLQ c.555+1G>A Likely pathogenic ★★ same condition
COLQ c.718-1276C>T Likely 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/colq-p-pro203ser (accessed [today's date]).

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