NM_015702.3(MMADHC):c.808T>C (p.Trp270Arg) AND Methylmalonic aciduria and homocystinuria type cblD

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Aug 24, 2021
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV001936833.5

Allele description [Variation Report for NM_015702.3(MMADHC):c.808T>C (p.Trp270Arg)]

NM_015702.3(MMADHC):c.808T>C (p.Trp270Arg)

Gene:

MMADHC:metabolism of cobalamin associated D [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

2q23.2

Genomic location:

Preferred name:

NM_015702.3(MMADHC):c.808T>C (p.Trp270Arg)

HGVS:

NC_000002.12:g.149570057A>G
NG_009189.1:g.22760T>C
NM_015702.3:c.808T>CMANE SELECT
NP_056517.1:p.Trp270Arg
NC_000002.11:g.150426571A>G

Protein change:

W270R

Links:

dbSNP: rs2105041421

NCBI 1000 Genomes Browser:

rs2105041421

Molecular consequence:

NM_015702.3:c.808T>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Methylmalonic aciduria and homocystinuria type cblD (MAHCD)
Synonyms:: METHYLMALONIC ACIDEMIA, cblH TYPE; Methylmalonic acidemia with homocystinuria cblD; Methylmalonic aciduria with homocystinuria cblD type
Identifiers:: MONDO: MONDO:0010185; MedGen: C1848552; Orphanet: 622; Orphanet: 79283; OMIM: 277410

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002226498	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Aug 24, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002226498

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Aug 24, 2021)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV002226498.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

This sequence change replaces tryptophan with arginine at codon 270 of the MMADHC protein (p.Trp270Arg). The tryptophan residue is highly conserved and there is a moderate physicochemical difference between tryptophan and arginine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with MMADHC-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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