Is COMP p.Ala109= (c.327G>T) pathogenic?

COMP p.Ala109= (c.327G>T) is classified Uncertain significance in COMP (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-13). Absent from gnomAD v4.1; Associated with multiple epiphyseal dysplasia type 1.

What condition is associated with COMP p.Ala109= (c.327G>T)?

COMP p.Ala109= (c.327G>T) is associated with multiple epiphyseal dysplasia type 1, pseudoachondroplasia (ClinVar).

How common is COMP p.Ala109= (c.327G>T) in the general population?

COMP p.Ala109= (c.327G>T) is absent from gnomAD v4.1 (gnomAD).

How is Multiple epiphyseal dysplasia type 1 inherited?

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

COMP p.Ala109=

c.327G>T · rs2055200293 · VCV889620

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,589,640)

Conditions

multiple epiphyseal dysplasia type 1

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 0.78	GERP -3.7, phastCons 1
Overall
CADD	14.42	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,589,640). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: COMP
Protein: p.Ala109=
Coding: c.327G>T
MANE Select: NM_000095
dbSNP: rs2055200293
Type: single nucleotide variant
Location: chr19:18790005 (GRCh38)
Gene constraint: LOEUF 1.073 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 88.60 · 1 PDB
Residue 109: the egf-like 1 domain; a disulfide bond; a UniProt-annotated variant site (sequence variant)

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

Disease context

multiple epiphyseal dysplasia type 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: pseudoachondroplasia

For Multiple epiphyseal dysplasia type 1 (Orphanet):

Inheritance: Autosomal dominant
Onset: Childhood

Similar variants

COMP p.Arg718Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
COMP p.Asn489Lys Pathogenic/Likely pathogenic ★★ same condition
COMP p.Asn523Lys Pathogenic/Likely pathogenic ★★ same condition
COMP p.Asn555Lys Pathogenic/Likely pathogenic ★★ same condition
COMP p.Asp269Gly Pathogenic/Likely pathogenic ★★ same condition
COMP p.Asp273Val Likely pathogenic ★★ same condition
COMP p.Asp326Asn Pathogenic/Likely pathogenic ★★ same condition
COMP p.Asp349His 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/comp-p-ala109 (accessed [today's date]).

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