NM_052845.4(MMAB):c.583C>T (p.Arg195Cys) AND Methylmalonic aciduria, cblB type

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Oct 24, 2022
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:: RCV000797106.4

Allele description [Variation Report for NM_052845.4(MMAB):c.583C>T (p.Arg195Cys)]

NM_052845.4(MMAB):c.583C>T (p.Arg195Cys)

Gene:

MMAB:metabolism of cobalamin associated B [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

12q24.11

Genomic location:

Preferred name:

NM_052845.4(MMAB):c.583C>T (p.Arg195Cys)

HGVS:

NC_000012.12:g.109561041G>A
NG_007096.1:g.17457C>T
NM_052845.4:c.583C>TMANE SELECT
NP_443077.1:p.Arg195Cys
NC_000012.11:g.109998846G>A
NM_052845.3:c.583C>T
NR_038118.2:n.694C>T

Protein change:

R195C

Links:

dbSNP: rs199853576

NCBI 1000 Genomes Browser:

rs199853576

Molecular consequence:

NM_052845.4:c.583C>T - missense variant - [Sequence Ontology: SO:0001583]
NR_038118.2:n.694C>T - non-coding transcript variant - [Sequence Ontology: SO:0001619]

Condition(s)

Name:: Methylmalonic aciduria, cblB type (MACB)
Synonyms:: METHYLMALONIC ACIDURIA, VITAMIN B12-RESPONSIVE, DUE TO DEFECT IN SYNTHESIS OF ADENOSYLCOBALAMIN, cblB TYPE; Methylmalonic acidemia cblB type; Vitamin B12-responsive methylmalonic acidemia type cblB
Identifiers:: MONDO: MONDO:0009614; MedGen: C1855102; Orphanet: 28; Orphanet: 79311; OMIM: 251110

Recent activity

Clear Turn Off Turn On

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

Help

Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000936647	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Oct 24, 2022)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001455421	Natera, Inc.	no assertion criteria provided	Uncertain significance (Jan 24, 2020)	germline	clinical testing

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000936647

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Oct 24, 2022)

germline

clinical testing

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

SCV001455421

Natera, Inc.

no assertion criteria provided

Uncertain significance
(Jan 24, 2020)

germline

clinical testing

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, SCV000936647.2

#	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 arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 195 of the MMAB protein (p.Arg195Cys). This variant is present in population databases (rs199853576, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with MMAB-related conditions. ClinVar contains an entry for this variant (Variation ID: 643413). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The cysteine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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

From Natera, Inc., SCV001455421.1

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

#	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: Oct 8, 2024

ClinVar

Relating variation to medicine