Is FERMT3 p.Pro203= (c.609G>A) pathogenic?

FERMT3 p.Pro203= (c.609G>A) is classified Likely benign in FERMT3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-22). Very rare (popmax 0.00773%, sas); Associated with leukocyte adhesion deficiency 3.

What condition is associated with FERMT3 p.Pro203= (c.609G>A)?

FERMT3 p.Pro203= (c.609G>A) is associated with leukocyte adhesion deficiency 3 (ClinVar).

How common is FERMT3 p.Pro203= (c.609G>A) in the general population?

FERMT3 p.Pro203= (c.609G>A) is very rare (popmax 0.00773%, sas) (gnomAD).

How is Leukocyte adhesion deficiency inherited?

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

FERMT3 p.Pro203=

c.609G>A · rs559712391 · VCV1953220

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00773%, sas)

Conditions

leukocyte adhesion deficiency 3

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 -8.5	GERP -2.1
Overall
CADD	0.156	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00773% South Asian · 7/90,530 alleles

Filtering AF 0.00361% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00256%

Overall 0.00162% 26/1,609,836 alleles · very rare exomes 24/1,457,744 · genomes 2/152,092 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00773%	12,933
Remaining individualsnot grpmax-eligible	0.00482%	20,767
Admixed American	0.00335%	29,872
East Asian	0.00224%	44,724
European (non-Finnish)	0.0011%	90,674

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: FERMT3
Protein: p.Pro203=
Coding: c.609G>A
MANE Select: NM_031471
dbSNP: rs559712391
Type: single nucleotide variant
Location: chr11:64211369 (GRCh38)
Gene constraint: LOEUF 0.556 · pLI 0.17 (gnomAD)
Structure: AlphaFold pLDDT 83.80 · 6 PDB
Residue 203: an α-helix

Full FERMT3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

leukocyte adhesion deficiency 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Leukocyte adhesion deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy

Similar variants

FERMT3 p.Pro203Leu Uncertain significance ★★ ⚠ same residue
FERMT3 p.Pro203Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
FERMT3 p.Arg573Ter Pathogenic/Likely pathogenic ★★ same condition
FERMT3 p.Ala109Thr Uncertain significance ★★ ⚠ same condition
FERMT3 p.Ala338Val Uncertain significance ★★ ⚠ same condition
FERMT3 p.Ala570Thr Uncertain significance ★★ ⚠ same condition
FERMT3 p.Arg103Gln Uncertain significance ★★ ⚠ same condition
FERMT3 p.Arg111His 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/fermt3-p-pro203 (accessed [today's date]).

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