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Prepair 1000+

Gene: MUT

Green List (high evidence)

MUT (methylmalonyl-CoA mutase)
EnsemblGeneIds (GRCh38): ENSG00000146085
EnsemblGeneIds (GRCh37): ENSG00000146085
OMIM: 609058, Gene2Phenotype
MUT is in 15 panels

1 review

Lauren Thomas (VIctorian Clinical Genetics Services)

Green List (high evidence)

Isolated methylmalonic aciduria is found in patients with mutations in the MUT gene causing partial, mut(-), or complete, mut(0), enzyme deficiency. Variable severity and age of onset:

• Infantile completely deficient (mut0) or non-B12-responsive (clbB) is the most common phenotype and presents during infancy. Infants are normal at birth, but develop lethargy, vomiting, and dehydration within the first few months of life. They may also exhibit hepatomegaly, hypotonia, encephalopathy, metabolic acidosis, ketosis and ketonuria, hyperammonemia, and hyperglycemia.

• Partially deficient (mut-) or B12-responsive (cblA, cblD, rarely cblB) is an intermediate phenotype that can occur in the first few months or years of life. Symptoms include feeding problems, failure to thrive, hypotonia, and developmental delay. Some have protein aversion and vomiting, and lethargy after protein intake.

HGNC approved symbol/name: MMUT *
Is the phenotype(s) severe and onset <18yo? Yes
Treatments available: cobalamin, N-carbamylglutamate, carnitine, diet, liver transplant
Known technical challenges? No
Gene reported in 3 independent families: Yes

* NOTE: gene previously called MUT
Created: 29 Jan 2025, 4:33 a.m. | Last Modified: 29 Jan 2025, 4:34 a.m.
Panel Version: 1.1367

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Methylmalonic aciduria, mut(0) type, MIM# 251000

History Filter Activity

30 Jan 2025, Gel status: 3

Entity classified by Genomics England curator

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Gene: mut has been classified as Green List (High Evidence).

30 Jan 2025, Gel status: 3

Set Phenotypes

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Phenotypes for gene: MUT were changed from Methylmalonic aciduria, mut(0) type, 251000 (3) to Methylmalonic aciduria, mut(0) type, MIM# 251000

2 Nov 2023, Gel status: 3

Set Phenotypes

Seb Lunke (Victorian Clinical Genetics Services)

Added phenotypes Methylmalonic aciduria, mut(0) type, 251000 (3) for gene: MUT

1 Jun 2022, Gel status: 3

Created, Added New Source, Set mode of inheritance, Set Phenotypes

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

gene: MUT was added gene: MUT was added to Reproductive Carrier Screen_VCGS. Sources: Mackenzie's Mission,Expert Review Green Mode of inheritance for gene: MUT was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: MUT were set to Methylmalonic aciduria, mut(0) type, 251000 (3)