NM_002435.3(MPI):c.124G>C (p.Glu42Gln) AND MPI-congenital disorder of glycosylation

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: May 8, 2023
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:: RCV002630145.3

Allele description [Variation Report for NM_002435.3(MPI):c.124G>C (p.Glu42Gln)]

NM_002435.3(MPI):c.124G>C (p.Glu42Gln)

Gene:

MPI:mannose phosphate isomerase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

15q24.1

Genomic location:

Preferred name:

NM_002435.3(MPI):c.124G>C (p.Glu42Gln)

HGVS:

NC_000015.10:g.74890634G>C
NG_008921.1:g.5566G>C
NG_008921.2:g.5594G>C
NM_001289155.2:c.124G>C
NM_001289156.2:c.-7+545G>C
NM_001289157.2:c.124G>C
NM_001330372.2:c.64G>C
NM_002435.3:c.124G>CMANE SELECT
NP_001276084.1:p.Glu42Gln
NP_001276086.1:p.Glu42Gln
NP_001317301.1:p.Glu22Gln
NP_002426.1:p.Glu42Gln
NC_000015.9:g.75182975G>C

Protein change:

E22Q

Molecular consequence:

NM_001289156.2:c.-7+545G>C - intron variant - [Sequence Ontology: SO:0001627]
NM_001289155.2:c.124G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001289157.2:c.124G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001330372.2:c.64G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_002435.3:c.124G>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: MPI-congenital disorder of glycosylation
Synonyms:: CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ib; CDG Ib; Congenital disorder of glycosylation type 1B; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0011257; MedGen: C1865145; Orphanet: 79319; OMIM: 602579

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002949449	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (May 8, 2023)	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

SCV002949449

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(May 8, 2023)

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, SCV002949449.2

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

Description

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MPI protein function. ClinVar contains an entry for this variant (Variation ID: 1918818). This variant has not been reported in the literature in individuals affected with MPI-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.006%). This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 42 of the MPI protein (p.Glu42Gln).

#	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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