Is COL4A3 p.Pro147= (c.441G>C) pathogenic?

COL4A3 p.Pro147= (c.441G>C) is classified Uncertain significance in COL4A3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-25). Absent from gnomAD v4.1; Associated with autosomal dominant Alport syndrome.

What condition is associated with COL4A3 p.Pro147= (c.441G>C)?

COL4A3 p.Pro147= (c.441G>C) is associated with autosomal dominant Alport syndrome (ClinVar).

How common is COL4A3 p.Pro147= (c.441G>C) in the general population?

COL4A3 p.Pro147= (c.441G>C) is absent from gnomAD v4.1 (gnomAD).

How is Alport syndrome inherited?

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

COL4A3 p.Pro147=

c.441G>C · VCV4077065

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

autosomal dominant Alport syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.76	donor loss · deltas
Pangolin	Δ0.67	loss · gain 0.02 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP -0.14	GERP -2.5
Overall
CADD	17.59	PHRED · no single calibrated threshold — expert panels disagree

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: COL4A3
Protein: p.Pro147=
Coding: c.441G>C
MANE Select: NM_000091
Type: single nucleotide variant
Location: chr2:227246738 (GRCh38)
Gene constraint: LOEUF 0.709 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 48.64 · 2 PDB
Residue 147: the 'triple-helical region' region

Full COL4A3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal dominant Alport syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Alport syndrome (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked dominant
Onset: Adolescent, Adult, Childhood, Elderly

Similar variants

COL4A3 c.1114+1G>A Likely pathogenic ★★ same condition
COL4A3 c.1114+2T>C Pathogenic/Likely pathogenic ★★ same condition
COL4A3 c.1408+1G>C Pathogenic/Likely pathogenic ★★ same condition
COL4A3 c.2656+1G>T Pathogenic/Likely pathogenic ★★ same condition
COL4A3 c.2746+1G>T Pathogenic ★★ same condition
COL4A3 c.2747-1G>C Likely pathogenic ★★ same condition
COL4A3 c.279+1G>A Likely pathogenic ★★ same condition
COL4A3 c.279+1G>T 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/col4a3-p-pro147 (accessed [today's date]).

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