Is MDH2 p.Ala9= (c.27C>T) pathogenic?

MDH2 p.Ala9= (c.27C>T) is classified Likely benign in MDH2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-04-28). Very rare (popmax 8.72e-05%, nfe); Associated with Inborn genetic diseases.

What condition is associated with MDH2 p.Ala9= (c.27C>T)?

MDH2 p.Ala9= (c.27C>T) is associated with Inborn genetic diseases (ClinVar).

How common is MDH2 p.Ala9= (c.27C>T) in the general population?

MDH2 p.Ala9= (c.27C>T) is very rare (popmax 8.72e-05%, nfe) (gnomAD).

MDH2 p.Ala9=

c.27C>T · rs1554584459 · VCV1796174

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 8.72e-05%, nfe)

Conditions

Inborn genetic diseases

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 -2.4
Overall
CADD	12.89	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.72e-05% European (non-Finnish) · 1/1,146,652 alleles

Overall 7.23e-05% 1/1,383,930 alleles · very rare

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: MDH2
Protein: p.Ala9=
Coding: c.27C>T
MANE Select: NM_005918
dbSNP: rs1554584459
Type: single nucleotide variant
Location: chr7:76048187 (GRCh38)
Gene constraint: LOEUF 0.984 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.49 · 7 PDB
Residue 9: a UniProt-annotated variant site (in)

Full MDH2 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

Similar variants

MDH2 p.Ala9Val Benign ★★ same residue
MDH2 p.Ala135Gly Uncertain significance ★★ ⚠ same condition
MDH2 p.Ala141Thr Uncertain significance ★★ same condition
MDH2 p.Ala177Thr Uncertain significance ★★ ⚠ same condition
MDH2 p.Ala21Val Uncertain significance ★★ ⚠ same condition
MDH2 p.Ala242Val Uncertain significance ★★ ⚠ same condition
MDH2 p.Ala256Thr Uncertain significance ★★ ⚠ same condition
MDH2 p.Ala325Val 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/mdh2-p-ala9 (accessed [today's date]).

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