Is APOC2 p.Ala55= (c.165C>T) pathogenic?

APOC2 p.Ala55= (c.165C>T) is classified Likely benign in APOC2 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-03-01). Very rare (popmax 0.00525%, nfe); Associated with Cardiovascular phenotype.

What condition is associated with APOC2 p.Ala55= (c.165C>T)?

APOC2 p.Ala55= (c.165C>T) is associated with Cardiovascular phenotype (ClinVar).

How common is APOC2 p.Ala55= (c.165C>T) in the general population?

APOC2 p.Ala55= (c.165C>T) is very rare (popmax 0.00525%, nfe) (gnomAD).

APOC2 p.Ala55=

c.165C>T · rs758335932 · VCV1777439

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00525%, nfe)

Conditions

Cardiovascular phenotype

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 -0.49	GERP -2
Overall
CADD	2.063	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00525% European (non-Finnish) · 62/1,180,036 alleles

Filtering AF 0.00418% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0038%

Overall 0.00403% 65/1,613,958 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00525%	19,033
Remaining individualsnot grpmax-eligible	0.0032%	31,242
African / African-American	0.00133%	74,918

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: APOC2
Protein: p.Ala55=
Coding: c.165C>T
MANE Select: NM_000483
dbSNP: rs758335932
Type: single nucleotide variant
Location: chr19:44948810 (GRCh38)
Gene constraint: LOEUF 1.054 · pLI 0.07 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 65.81 · 4 PDB
Residue 55: an α-helix

Full APOC2 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

Similar variants

APOC2 p.Ala55Thr Uncertain significance ★★ ⚠ same residue
APOC2 p.Gln25Ter Likely pathogenic ★★ same condition
APOC2 p.Ala54Asp Uncertain significance ★★ ⚠ same condition
APOC2 p.Ser76Ile Uncertain significance ★★ ⚠ same condition
APOC2 p.Thr23Ile Uncertain significance ★★ ⚠ same condition
APOC2 p.Thr86Arg Uncertain significance ★★ ⚠ same condition
APOC2 p.Val67Ile Uncertain significance ★★ ⚠ same condition
APOC2 c.56-4G>C Benign ★★ 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/apoc2-p-ala55 (accessed [today's date]).

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