Is EFEMP2 p.Asp166Asn (c.496G>A) pathogenic?

EFEMP2 p.Asp166Asn (c.496G>A) is classified Uncertain significance in EFEMP2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-15). AlphaMissense: ambiguous (0.4399); Very rare (popmax 0.0022%, nfe); Associated with Cardiovascular phenotype.

What condition is associated with EFEMP2 p.Asp166Asn (c.496G>A)?

EFEMP2 p.Asp166Asn (c.496G>A) is associated with Cardiovascular phenotype, cutis laxa, autosomal recessive, type 1B (ClinVar).

How common is EFEMP2 p.Asp166Asn (c.496G>A) in the general population?

EFEMP2 p.Asp166Asn (c.496G>A) is very rare (popmax 0.0022%, nfe) (gnomAD).

What do computational predictors say about EFEMP2 p.Asp166Asn (c.496G>A)?

AlphaMissense predicts ambiguous (score 0.4399) — an in-silico prediction, not a clinical call.

EFEMP2 p.Asp166Asn

c.496G>A · rs145037272 · VCV472827

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

ambiguous

0.4399 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0022%, nfe)

Conditions

Cardiovascular phenotype

Computational evidence

Protein change
AlphaMissense	0.4399	ambiguous
REVEL	0.457	indeterminate
SaProt	LLR -8.23	tolerated
Splicing
SpliceAI	Δ0.36	acceptor loss, 1 bp away · masked 0 · deltas
Constraint at this position
Conservation	phyloP 7.6	GERP 1.9, phastCons 1
Regional constraint	o/e 0.83	unconstrained · MANE · 5,433 bp · p 3.8e-05 · regional, not allelic
Overall
CADD	27.0	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 0.0022% European (non-Finnish) · 26/1,179,962 alleles

Filtering AF 0.00153% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0013%

Overall 0.00174% 28/1,613,118 alleles · very rare exomes 27/1,461,066 · genomes 1/152,052 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0022%	45,383
Admixed American	0.00167%	59,990
African / African-American	0.00134%	74,852

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: EFEMP2
Protein: p.Asp166Asn
Coding: c.496G>A
MANE Select: NM_016938
dbSNP: rs145037272
Type: single nucleotide variant
Location: chr11:65870232 (GRCh38)
Gene constraint: LOEUF 0.56 · pLI 0.62 (gnomAD)
Structure: AlphaFold pLDDT 82.95 · 1 PDB
Residue 166: the egf-like 3; calcium-binding domain

Full EFEMP2 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: cutis laxa, autosomal recessive, type 1B

Similar variants

EFEMP2 p.Asp166= Likely benign ★★ same residue
EFEMP2 p.Arg279Cys Likely pathogenic ★★ same condition
EFEMP2 p.Asp203Ala Pathogenic/Likely pathogenic ★★ same condition
EFEMP2 p.Glu126Lys Pathogenic/Likely pathogenic ★★ same condition
EFEMP2 p.Glu161Lys Pathogenic/Likely pathogenic ★★ ⚠ same condition
EFEMP2 p.Glu167Ter Pathogenic ★★ same condition
EFEMP2 c.161-6C>G Uncertain significance ★★ same condition
EFEMP2 c.491-5C>G Uncertain significance ★★ 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/efemp2-p-asp166asn (accessed [today's date]).

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