Is ABCA3 p.Ala320Ser (c.958G>T) pathogenic?

ABCA3 p.Ala320Ser (c.958G>T) is classified Uncertain significance in ABCA3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-08-04). AlphaMissense: likely benign (0.0848); Very rare (popmax 0.00102%, nfe); Associated with hereditary pulmonary alveolar proteinosis.

What condition is associated with ABCA3 p.Ala320Ser (c.958G>T)?

ABCA3 p.Ala320Ser (c.958G>T) is associated with hereditary pulmonary alveolar proteinosis (ClinVar).

How common is ABCA3 p.Ala320Ser (c.958G>T) in the general population?

ABCA3 p.Ala320Ser (c.958G>T) is very rare (popmax 0.00102%, nfe) (gnomAD).

How is Hereditary pulmonary alveolar proteinosis inherited?

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

What do computational predictors say about ABCA3 p.Ala320Ser (c.958G>T)?

AlphaMissense predicts likely benign (score 0.0848) — an in-silico prediction, not a clinical call.

ABCA3 p.Ala320Ser

c.958G>T · rs780116425 · VCV2616036

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0848 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00102%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary pulmonary alveolar proteinosis

Computational evidence

Protein change
AlphaMissense	0.0848	likely benign
REVEL	0.139	moderately benign-leaning
SaProt	LLR -5.66	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.23	GERP -4.4, phastCons 0.007
Regional constraint	o/e 0.98	unconstrained · MANE · 40 kb · p 0.47 · regional, not allelic
Overall
CADD	4.674	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00102% European (non-Finnish) · 12/1,179,994 alleles

Filtering AF 0.000542% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000428%

Overall 0.000821% 12/1,461,832 alleles · very 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: ABCA3
Protein: p.Ala320Ser
Coding: c.958G>T
MANE Select: NM_001089
dbSNP: rs780116425
Type: single nucleotide variant
Location: chr16:2317680 (GRCh38)
Gene constraint: LOEUF 0.612 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.00 · 2 PDB
Residue 320: an α-helix

Full ABCA3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary pulmonary alveolar proteinosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Hereditary pulmonary alveolar proteinosis (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Elderly, Infancy
Prevalence: <1 / 1 000 000 (Worldwide)

Similar variants

ABCA3 p.Ala320Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
ABCA3 c.2053-1G>C Likely pathogenic ★★ same condition
ABCA3 c.3863-98C>T Pathogenic ★★ same condition
ABCA3 p.Arg1550Trp Likely pathogenic ★★ same condition
ABCA3 p.Arg43Cys Pathogenic/Likely pathogenic ★★ same condition
ABCA3 p.Arg43His Pathogenic/Likely pathogenic ★★ ⚠ same condition
ABCA3 p.Glu1540Lys Likely pathogenic ★★ same condition
ABCA3 p.Glu292Val 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/abca3-p-ala320ser (accessed [today's date]).

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