Is ITGA3 p.Ala503= (c.1509C>T) pathogenic?

ITGA3 p.Ala503= (c.1509C>T) is classified Likely benign in ITGA3 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-09). Rare (popmax 0.33%, amr); Associated with epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome.

How common is ITGA3 p.Ala503= (c.1509C>T) in the general population?

ITGA3 p.Ala503= (c.1509C>T) is rare (popmax 0.33%, amr) (gnomAD).

ITGA3 p.Ala503=

Q: What condition is associated with ITGA3 p.Ala503= (c.1509C>T)?

ITGA3 p.Ala503= (c.1509C>T) is associated with epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome (ClinVar).

Q: How is Interstitial lung disease-nephrotic syndrome-epidermolysis bullosa syndrome inherited?

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

c.1509C>T · rs192121420 · VCV723099

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

rare (popmax 0.33%, amr)

Conditions

epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome

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 -11	GERP -3.6
Overall
CADD	3.264	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.33% Admixed American · 198/60,028 alleles

Filtering AF 0.292% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.278%

Overall 0.0466% 752/1,614,198 alleles · rare exomes 666/1,461,882 · genomes 86/152,316 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.33%	303
Remaining individualsnot grpmax-eligible	0.0528%	1,894
European (non-Finnish)	0.0435%	2,300
African / African-American	0.0107%	9,381

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: ITGA3
Protein: p.Ala503=
Coding: c.1509C>T
MANE Select: NM_002204
dbSNP: rs192121420
Type: single nucleotide variant
Location: chr17:50075498 (GRCh38)
Gene constraint: LOEUF 0.69 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 83.88

Full ITGA3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

epidermolysis bullosa, junctional 7, with interstitial lung disease and nephrotic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Interstitial lung disease-nephrotic syndrome-epidermolysis bullosa syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ITGA3 c.2070+1G>A Pathogenic ★★ same condition
ITGA3 p.Arg274Gln Likely pathogenic ★★ ⚠ same condition
ITGA3 p.Arg875Ter Likely pathogenic ★★ same condition
ITGA3 c.*48G>A Uncertain significance ★★ same condition
ITGA3 c.*96G>A Uncertain significance ★★ same condition
ITGA3 p.Ala1026Val Uncertain significance ★★ ⚠ same condition
ITGA3 p.Ala1035Val Uncertain significance ★★ ⚠ same condition
ITGA3 p.Arg156Trp 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/itga3-p-ala503 (accessed [today's date]).

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