Is COL6A3 p.Arg609= (c.1825C>A) pathogenic?

COL6A3 p.Arg609= (c.1825C>A) is classified Likely benign in COL6A3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-03-26). Very rare (popmax 8.47e-05%, nfe); Associated with Bethlem myopathy 1A.

What condition is associated with COL6A3 p.Arg609= (c.1825C>A)?

COL6A3 p.Arg609= (c.1825C>A) is associated with Bethlem myopathy 1A (ClinVar).

How common is COL6A3 p.Arg609= (c.1825C>A) in the general population?

COL6A3 p.Arg609= (c.1825C>A) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

How is Bethlem muscular dystrophy inherited?

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

COL6A3 p.Arg609=

c.1825C>A · rs755382829 · VCV3007749

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Conditions

Bethlem myopathy 1A

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 9.7	GERP 1.6, phastCons 1
Overall
CADD	10.75	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,036 alleles

Overall 6.84e-05% 1/1,461,854 alleles · very 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: COL6A3
Protein: p.Arg609=
Coding: c.1825C>A
MANE Select: NM_004369
dbSNP: rs755382829
Type: single nucleotide variant
Location: chr2:237380987 (GRCh38)
Gene constraint: LOEUF 0.564 · pLI <0.01 (gnomAD)
Residue 609: the 'nonhelical region' region; the vwfa 3 domain

Full COL6A3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Bethlem myopathy 1A — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Bethlem muscular dystrophy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Childhood, Infancy
Prevalence: 1-9 / 1 000 000 (United Kingdom)

Similar variants

COL6A3 p.Arg609Ter Pathogenic/Likely pathogenic ★★ same residue
COL6A3 p.Arg609Gln Conflicting classifications of pathogenicity ★ same residue
COL6A3 c.5838+1G>T Pathogenic/Likely pathogenic ★★ same condition
COL6A3 c.6156+1G>A Pathogenic ★★ same condition
COL6A3 c.6157-2A>C Pathogenic ★★ same condition
COL6A3 c.6210+1G>A Pathogenic ★★ same condition
COL6A3 c.6282+1G>A Pathogenic ★★ same condition
COL6A3 c.6309+1G>A 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/col6a3-p-arg609 (accessed [today's date]).

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