Is AFG2A p.Glu377= (c.1131G>A) pathogenic?

AFG2A p.Glu377= (c.1131G>A) is classified Benign/Likely benign in AFG2A (ClinVar, Multiple submitters, 6 submitters; last evaluated 2026-02-03). Rare (popmax 0.339%, afr); Associated with microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome.

How common is AFG2A p.Glu377= (c.1131G>A) in the general population?

AFG2A p.Glu377= (c.1131G>A) is rare (popmax 0.339%, afr) (gnomAD).

AFG2A p.Glu377=

Q: What condition is associated with AFG2A p.Glu377= (c.1131G>A)?

AFG2A p.Glu377= (c.1131G>A) is associated with microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome (ClinVar).

c.1131G>A · rs139089747 · VCV475715

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 6 submitters

gnomAD v4.1

Rare

rare (popmax 0.339%, afr)

Conditions

microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome

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 0.034	GERP -2.7, phastCons 0.085
Overall
CADD	0.557	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.339% African / African-American · 248/73,244 alleles

Filtering AF 0.304% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.291%

Overall 0.017% 268/1,578,160 alleles · rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.339%	295
Admixed American	0.0191%	5,232
Middle Eastern	0.0172%	5,814
Remaining individualsnot grpmax-eligible	0.0115%	8,709
South Asian	0.0012%	83,006
European (non-Finnish)	8.57e-05%	1,167,376

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: AFG2A
Protein: p.Glu377=
Coding: c.1131G>A
MANE Select: NM_145207
dbSNP: rs139089747
Type: single nucleotide variant
Location: chr4:122934722 (GRCh38)
Structure: AlphaFold pLDDT 73.21 · 2 PDB
Residue 377: a UniProt-annotated variant site (in nedhsb)

Full AFG2A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

AFG2A c.1714+1G>A Pathogenic ★★ same condition
AFG2A c.446+1G>A Likely pathogenic ★★ same condition
AFG2A p.Ala844Val Pathogenic/Likely pathogenic ★★ ⚠ same condition
AFG2A p.Arg445Ter Pathogenic/Likely pathogenic ★★ same condition
AFG2A p.Arg510Ter Pathogenic/Likely pathogenic ★★ same condition
AFG2A p.Arg514Ter Pathogenic/Likely pathogenic ★★ same condition
AFG2A p.Arg538Ter Pathogenic/Likely pathogenic ★★ same condition
AFG2A p.Arg655Ter 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/afg2a-p-glu377 (accessed [today's date]).

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