Is APOB p.Val733= (c.2199C>T) pathogenic?

APOB p.Val733= (c.2199C>T) is classified Likely benign in APOB (ClinVar, Single submitter, 1 submitter; last evaluated 2025-11-21). Very rare (popmax 0.00267%, afr); Associated with familial hypobetalipoproteinemia 1.

What condition is associated with APOB p.Val733= (c.2199C>T)?

APOB p.Val733= (c.2199C>T) is associated with familial hypobetalipoproteinemia 1, hypercholesterolemia, autosomal dominant, type B (ClinVar).

How common is APOB p.Val733= (c.2199C>T) in the general population?

APOB p.Val733= (c.2199C>T) is very rare (popmax 0.00267%, afr) (gnomAD).

APOB p.Val733=

c.2199C>T · VCV4794813

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00267%, afr)

Conditions

familial hypobetalipoproteinemia 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.44 · evaluated, not missing
Constraint at this position
Conservation	phyloP 2.3	GERP -0.24, phastCons 1
Overall
CADD	5.594	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00267% African / African-American · 2/74,906 alleles

Filtering AF 0.000443% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000166%

Overall 0.000124% 2/1,613,918 alleles · very rare exomes 1/1,461,758 · genomes 1/152,160 · joint denominator

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.Val733=
Coding: c.2199C>T
MANE Select: NM_000384
Type: single nucleotide variant
Location: chr2:21026833 (GRCh38)
Gene constraint: LOEUF 0.537 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 733: 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 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
APOB p.Arg2513Ter Pathogenic ★★ same condition
APOB p.Arg2520Ter 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-val733 (accessed [today's date]).

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