Is GDF6 p.Pro176= (c.528C>T) pathogenic?

GDF6 p.Pro176= (c.528C>T) is classified Likely benign in GDF6 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-18). Ultra-rare (popmax 0.0123%, amr); Associated with isolated microphthalmia 4.

What condition is associated with GDF6 p.Pro176= (c.528C>T)?

GDF6 p.Pro176= (c.528C>T) is associated with isolated microphthalmia 4, Klippel-Feil syndrome 1, autosomal dominant, microphthalmia, isolated, with coloboma 6 (ClinVar).

How common is GDF6 p.Pro176= (c.528C>T) in the general population?

GDF6 p.Pro176= (c.528C>T) is ultra-rare (popmax 0.0123%, amr) (gnomAD).

GDF6 p.Pro176=

c.528C>T · rs548565578 · VCV1568822

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0123%, amr)

Conditions

isolated microphthalmia 4

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 3.3	GERP -0.4, phastCons 1
Overall
CADD	11.76	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0123% Admixed American · 7/57,134 alleles

Filtering AF 0.00568% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00406%

Overall 0.000442% 7/1,582,296 alleles · ultra-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: GDF6
Protein: p.Pro176=
Coding: c.528C>T
MANE Select: NM_001001557
dbSNP: rs548565578
Type: single nucleotide variant
Location: chr8:96145403 (GRCh38)
Gene constraint: LOEUF 0.342 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 70.88

Full GDF6 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

isolated microphthalmia 4 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Klippel-Feil syndrome 1, autosomal dominant microphthalmia, isolated, with coloboma 6 Leber congenital amaurosis 17

Similar variants

GDF6 c.*268G>C Uncertain significance ★★ same condition
GDF6 c.*273C>T Uncertain significance ★★ same condition
GDF6 c.*274T>C Uncertain significance ★★ same condition
GDF6 p.Ala199Thr Uncertain significance ★★ ⚠ same condition
GDF6 p.Ala199Val Uncertain significance ★★ ⚠ same condition
GDF6 p.Ala242Thr Uncertain significance ★★ ⚠ same condition
GDF6 p.Ala247Glu Uncertain significance ★★ ⚠ same condition
GDF6 p.Arg248Leu Uncertain significance ★★ ⚠ 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/gdf6-p-pro176 (accessed [today's date]).

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