Is APOB p.Ala448Thr (c.1342G>A) pathogenic?

APOB p.Ala448Thr (c.1342G>A) is classified Conflicting classifications of pathogenicity in APOB (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-12-26). AlphaMissense: likely benign (0.0678); Ultra-rare (popmax 0.0267%, eas); Associated with Cardiovascular phenotype.

What condition is associated with APOB p.Ala448Thr (c.1342G>A)?

APOB p.Ala448Thr (c.1342G>A) is associated with Cardiovascular phenotype, hypercholesterolemia, autosomal dominant, type B, familial hypobetalipoproteinemia 1 (ClinVar).

How common is APOB p.Ala448Thr (c.1342G>A) in the general population?

APOB p.Ala448Thr (c.1342G>A) is ultra-rare (popmax 0.0267%, eas) (gnomAD).

What do computational predictors say about APOB p.Ala448Thr (c.1342G>A)?

AlphaMissense predicts likely benign (score 0.0678) — an in-silico prediction, not a clinical call.

APOB p.Ala448Thr

c.1342G>A · rs752032737 · VCV630352

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0678 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0267%, eas)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
AlphaMissense	0.0678	likely benign
REVEL	0.075	moderately benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.64	GERP 1.5
Regional constraint	o/e 1.00	unconstrained · MANE · 32 kb · p 0.91 · regional, not allelic
Overall
CADD	14.94	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0267% East Asian · 12/44,874 alleles

Filtering AF 0.0154% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0121%

Overall 0.00178% 26/1,460,888 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0267%	3,740
Remaining individualsnot grpmax-eligible	0.0032%	31,242
Finnishnot grpmax-eligible	0.00158%	63,256
African / African-American	0.00133%	75,048
South Asian	0.0011%	91,068
European (non-Finnish)	0.000763%	131,108

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: APOB
Protein: p.Ala448Thr
Coding: c.1342G>A
MANE Select: NM_000384
dbSNP: rs752032737
Type: single nucleotide variant
Location: chr2:21032364 (GRCh38)
Gene constraint: LOEUF 0.537 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 448: the vitellogenin domain

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

Disease context

Cardiovascular phenotype — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hypercholesterolemia, autosomal dominant, type B familial hypobetalipoproteinemia 1

Similar variants

APOB p.Ala448Ser Uncertain significance ★ ⚠ same residue
APOB p.Ala448Val Conflicting classifications of pathogenicity ★ ⚠ same residue
APOB p.Ala448= Likely benign ★ same residue
APOB c.1830-1G>A Pathogenic ★★ same condition
APOB c.2604+1G>A Likely pathogenic ★★ same condition
APOB c.537+1G>T Pathogenic/Likely pathogenic ★★ same condition
APOB p.Arg1333Ter Pathogenic ★★ same condition
APOB p.Arg2012Ter 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/apob-p-ala448thr (accessed [today's date]).

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