Is COL1A2 p.Ala35= (c.105C>T) pathogenic?

COL1A2 p.Ala35= (c.105C>T) is classified Conflicting classifications of pathogenicity in COL1A2 (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2025-09-06). Ultra-rare (popmax 0.0165%, mid); Associated with Cardiovascular phenotype.

What condition is associated with COL1A2 p.Ala35= (c.105C>T)?

COL1A2 p.Ala35= (c.105C>T) is associated with Cardiovascular phenotype, osteogenesis imperfecta type 1, Ehlers-Danlos syndrome, classic type, 1 (ClinVar).

How common is COL1A2 p.Ala35= (c.105C>T) in the general population?

COL1A2 p.Ala35= (c.105C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

COL1A2 p.Ala35=

c.105C>T · rs533917998 · VCV1702184

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

Cardiovascular phenotype

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 -1.5	GERP -4.4
Overall
CADD	8.381	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,060 alleles

Filtering AF 0.00103% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00083%

Overall 0.00136% 22/1,613,502 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,060
European (non-Finnish)	0.00161%	62,084
Remaining individualsnot grpmax-eligible	0.0016%	62,482
African / African-American	0.00133%	74,960

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: COL1A2
Protein: p.Ala35=
Coding: c.105C>T
MANE Select: NM_000089
dbSNP: rs533917998
Type: single nucleotide variant
Location: chr7:94399057 (GRCh38)
Gene constraint: LOEUF 0.339 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 55.02 · 5 PDB
Residue 35: the 'disordered' region

Full COL1A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: osteogenesis imperfecta type 1 Ehlers-Danlos syndrome, classic type, 1 Ehlers-Danlos syndrome

Similar variants

COL1A2 c.1197+5G>A Pathogenic ★★ same condition
COL1A2 c.1404+1G>A Pathogenic/Likely pathogenic ★★ same condition
COL1A2 c.1503+1G>A Pathogenic/Likely pathogenic ★★ same condition
COL1A2 c.1503+1G>C Pathogenic ★★ same condition
COL1A2 c.1557+3A>G Pathogenic ★★ same condition
COL1A2 c.2026-2A>G Pathogenic/Likely pathogenic ★★ same condition
COL1A2 c.2133+6T>A Pathogenic ★★ same condition
COL1A2 c.226-2A>G 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/col1a2-p-ala35 (accessed [today's date]).

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