Is ABCA3 p.Ser666= (c.1998C>T) pathogenic?

ABCA3 p.Ser666= (c.1998C>T) is classified Likely benign in ABCA3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-09-20). Ultra-rare (popmax 0.0183%, nfe); Associated with hereditary pulmonary alveolar proteinosis.

What condition is associated with ABCA3 p.Ser666= (c.1998C>T)?

ABCA3 p.Ser666= (c.1998C>T) is associated with hereditary pulmonary alveolar proteinosis (ClinVar).

How common is ABCA3 p.Ser666= (c.1998C>T) in the general population?

ABCA3 p.Ser666= (c.1998C>T) is ultra-rare (popmax 0.0183%, nfe) (gnomAD).

How is Hereditary pulmonary alveolar proteinosis inherited?

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

ABCA3 p.Ser666=

c.1998C>T · rs757583248 · VCV2714688

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0183%, nfe)

Conditions

hereditary pulmonary alveolar proteinosis

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 -4.2	GERP -5.1
Overall
CADD	7.01	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0183% European (non-Finnish) · 216/1,180,048 alleles

Filtering AF 0.0163% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0155%

Overall 0.0146% 235/1,613,530 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0183%	5,463
Remaining individualsnot grpmax-eligible	0.016%	6,248
South Asian	0.00549%	18,218
African / African-American	0.004%	24,980
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,604

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.Ser666=
Coding: c.1998C>T
MANE Select: NM_001089
dbSNP: rs757583248
Type: single nucleotide variant
Location: chr16:2297820 (GRCh38)
Gene constraint: LOEUF 0.612 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.00 · 2 PDB
Residue 666: the abc transporter 1 domain

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 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
ABCA3 p.Gly1459Asp 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-ser666 (accessed [today's date]).

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