Is AFG2A p.Thr89Ser (c.266C>G) pathogenic?

AFG2A p.Thr89Ser (c.266C>G) is classified Uncertain significance in AFG2A (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-04-24). AlphaMissense: likely benign (0.1354); Absent from gnomAD v4.1; Associated with Inborn genetic diseases.

How common is AFG2A p.Thr89Ser (c.266C>G) in the general population?

AFG2A p.Thr89Ser (c.266C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about AFG2A p.Thr89Ser (c.266C>G)?

AlphaMissense predicts likely benign (score 0.1354) — an in-silico prediction, not a clinical call.

AFG2A p.Thr89Ser

Q: What condition is associated with AFG2A p.Thr89Ser (c.266C>G)?

AFG2A p.Thr89Ser (c.266C>G) is associated with Inborn genetic diseases, microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome (ClinVar).

c.266C>G · rs1728497805 · VCV966417

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1354 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1354	likely benign
REVEL	0.503	indeterminate
SaProt	LLR -7.73	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.4	GERP 1.2, phastCons 1
Regional constraint	o/e 0.99	unconstrained · MANE · 105 kb · p 0.81 · regional, not allelic
Overall
CADD	21.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: AFG2A
Protein: p.Thr89Ser
Coding: c.266C>G
MANE Select: NM_145207
dbSNP: rs1728497805
Type: single nucleotide variant
Location: chr4:122927736 (GRCh38)
Structure: AlphaFold pLDDT 73.21 · 2 PDB
Residue 89: the 'required for interaction with afg2b and cinp' region

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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

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

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-thr89ser (accessed [today's date]).

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