Is APOB p.Arg635= (c.1905G>T) pathogenic?

APOB p.Arg635= (c.1905G>T) is classified Uncertain significance in APOB (ClinVar, Single submitter, 1 submitter; last evaluated 2022-05-28). Very rare (popmax 0.000424%, nfe); Associated with familial hypobetalipoproteinemia 1.

What condition is associated with APOB p.Arg635= (c.1905G>T)?

APOB p.Arg635= (c.1905G>T) is associated with familial hypobetalipoproteinemia 1, hypercholesterolemia, autosomal dominant, type B (ClinVar).

How common is APOB p.Arg635= (c.1905G>T) in the general population?

APOB p.Arg635= (c.1905G>T) is very rare (popmax 0.000424%, nfe) (gnomAD).

APOB p.Arg635=

c.1905G>T · rs1572795906 · VCV2201381

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.000424%, nfe)

Conditions

familial hypobetalipoproteinemia 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.23	acceptor gain · deltas
Pangolin	Δ0.29	gain · loss 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP -0.077	GERP -1.1, phastCons 0.001
Overall
CADD	12.82	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000424% European (non-Finnish) · 5/1,179,964 alleles

Filtering AF 0.000124% ClinGen BA1/BS1 input FAF95, joint · FAF99 9e-05%

Overall 0.00031% 5/1,614,052 alleles · very rare exomes 5/1,461,818 · genomes 0/152,234 · 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.Arg635=
Coding: c.1905G>T
MANE Select: NM_000384
dbSNP: rs1572795906
Type: single nucleotide variant
Location: chr2:21027990 (GRCh38)
Gene constraint: LOEUF 0.537 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Residue 635: the vitellogenin domain

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.Arg635Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
APOB p.Arg635Trp Conflicting classifications of pathogenicity ★ ⚠ 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-arg635 (accessed [today's date]).

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