Is COL6A1 p.Asp158= (c.474C>T) pathogenic?

COL6A1 p.Asp158= (c.474C>T) is classified Likely benign in COL6A1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-03). Ultra-rare (popmax 0.0166%, mid); Associated with Bethlem myopathy 1A.

What condition is associated with COL6A1 p.Asp158= (c.474C>T)?

COL6A1 p.Asp158= (c.474C>T) is associated with Bethlem myopathy 1A (ClinVar).

How common is COL6A1 p.Asp158= (c.474C>T) in the general population?

COL6A1 p.Asp158= (c.474C>T) is ultra-rare (popmax 0.0166%, mid) (gnomAD).

How is Bethlem muscular dystrophy inherited?

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

COL6A1 p.Asp158=

c.474C>T · rs773280332 · VCV1111799

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0166%, mid)

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 -8.6	GERP -2.1
Overall
CADD	5.064	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0166% Middle Eastern · 1/6,036 alleles

Filtering AF 0.00536% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00386%

Overall 0.00434% 68/1,565,486 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0166%	6,036
African / African-American	0.0109%	9,198
European (non-Finnish)	0.0045%	22,217
South Asian	0.00353%	28,337
Remaining individualsnot grpmax-eligible	0.0033%	30,298
Admixed American	0.00186%	53,634
Finnishnot grpmax-eligible	0.00168%	59,634

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: COL6A1
Protein: p.Asp158=
Coding: c.474C>T
MANE Select: NM_001848
dbSNP: rs773280332
Type: single nucleotide variant
Location: chr21:45986571 (GRCh38)
Gene constraint: LOEUF 0.706 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 71.28 · 1 PDB
Residue 158: the vwfa 1 domain; the 'n-terminal globular domain' region

Full COL6A1 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

COL6A1 p.Asp158Asn Likely benign ★ same residue
COL6A1 c.1002+1G>A Pathogenic ★★ same condition
COL6A1 c.1003-1G>A Pathogenic ★★ same condition
COL6A1 c.1003-2A>C Pathogenic ★★ same condition
COL6A1 c.1003-2A>G Pathogenic ★★ same condition
COL6A1 c.1056+1G>A Pathogenic/Likely pathogenic ★★ same condition
COL6A1 c.1056+1G>C Pathogenic ★★ same condition
COL6A1 c.1056+2T>A Pathogenic/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/col6a1-p-asp158 (accessed [today's date]).

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