Is APOB p.Arg3638= (c.10912C>A) pathogenic?

APOB p.Arg3638= (c.10912C>A) is classified Likely benign in APOB (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-03-11). Very rare (popmax 0.00356%, nfe); Associated with familial hypobetalipoproteinemia 1.

What condition is associated with APOB p.Arg3638= (c.10912C>A)?

APOB p.Arg3638= (c.10912C>A) is associated with familial hypobetalipoproteinemia 1, hypercholesterolemia, autosomal dominant, type B (ClinVar).

How common is APOB p.Arg3638= (c.10912C>A) in the general population?

APOB p.Arg3638= (c.10912C>A) is very rare (popmax 0.00356%, nfe) (gnomAD).

APOB p.Arg3638=

c.10912C>A · rs61744151 · VCV696609

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00356%, nfe)

Conditions

familial hypobetalipoproteinemia 1

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 2.8	GERP -0.3, phastCons 0.36
Overall
CADD	0.72	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00356% European (non-Finnish) · 42/1,179,942 alleles

Filtering AF 0.00267% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00236%

Overall 0.00279% 45/1,613,720 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00356%	28,094
Remaining individualsnot grpmax-eligible	0.0016%	62,472
African / African-American	0.00134%	74,870
South Asian	0.0011%	91,062

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.Arg3638=
Coding: c.10912C>A
MANE Select: NM_000384
dbSNP: rs61744151
Type: single nucleotide variant
Location: chr2:21005956 (GRCh38)
Gene constraint: LOEUF 0.537 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 3638: a UniProt-annotated variant site (in)

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

Disease context

familial hypobetalipoproteinemia 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hypercholesterolemia, autosomal dominant, type B

Similar variants

APOB p.Arg3638Gln Benign/Likely benign ★★ same residue
APOB p.Arg3638Trp Uncertain significance ★ ⚠ 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
APOB p.Arg2085Ter 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/apob-p-arg3638 (accessed [today's date]).

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