Is MLYCD p.Ala79= (c.237C>G) pathogenic?

MLYCD p.Ala79= (c.237C>G) is classified Likely benign in MLYCD (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-08-30). Ultra-rare (popmax 0.036%, mid); Associated with malonic aciduria.

What condition is associated with MLYCD p.Ala79= (c.237C>G)?

MLYCD p.Ala79= (c.237C>G) is associated with malonic aciduria (ClinVar).

How common is MLYCD p.Ala79= (c.237C>G) in the general population?

MLYCD p.Ala79= (c.237C>G) is ultra-rare (popmax 0.036%, mid) (gnomAD).

How is Malonic aciduria inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

MLYCD p.Ala79=

c.237C>G · rs748458868 · VCV2716673

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.036%, mid)

Conditions

malonic aciduria

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 0.043	GERP -1, phastCons 0.016
Overall
CADD	11.38	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.036% Middle Eastern · 2/5,560 alleles

Filtering AF 0.0063% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00326%

Overall 0.00124% 19/1,527,422 alleles · ultra-rare exomes 18/1,375,448 · genomes 1/151,974 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.036%	2,780
Remaining individualsnot grpmax-eligible	0.0101%	9,907
African / African-American	0.01%	10,000
South Asian	0.00121%	82,962
European (non-Finnish)	0.000262%	382,186

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: MLYCD
Protein: p.Ala79=
Coding: c.237C>G
MANE Select: NM_012213
dbSNP: rs748458868
Type: single nucleotide variant
Location: chr16:83899381 (GRCh38)
Gene constraint: LOEUF 1.165 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 90.16 · 2 PDB
Residue 79: the 'alpha-helical domain' region

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

Disease context

malonic aciduria — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Malonic aciduria (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

MLYCD p.Ser187Ter Pathogenic ★★ same condition
MLYCD c.*218C>A Uncertain significance ★★ same condition
MLYCD p.Ala119Ser Uncertain significance ★★ ⚠ same condition
MLYCD p.Ala415Thr Uncertain significance ★★ ⚠ same condition
MLYCD p.Arg199Gln Uncertain significance ★★ ⚠ same condition
MLYCD p.Arg235Gly Uncertain significance ★★ ⚠ same condition
MLYCD p.Arg392Gln Uncertain significance ★★ ⚠ same condition
MLYCD p.Arg392Trp 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/mlycd-p-ala79 (accessed [today's date]).

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