NM_005198.5(CHKB):c.214T>C (p.Tyr72His) AND Megaconial type congenital muscular dystrophy

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Oct 18, 2022
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV000800374.10

Allele description [Variation Report for NM_005198.5(CHKB):c.214T>C (p.Tyr72His)]

NM_005198.5(CHKB):c.214T>C (p.Tyr72His)

Genes:

CHKB-CPT1B:CHKB-CPT1B readthrough (NMD candidate) [Gene - HGNC]
CHKB:choline kinase beta [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

22q13.33

Genomic location:

Preferred name:

NM_005198.5(CHKB):c.214T>C (p.Tyr72His)

HGVS:

NC_000022.11:g.50582568A>G
NG_012643.1:g.1100T>C
NG_029213.1:g.5432T>C
NM_005198.5:c.214T>CMANE SELECT
NP_005189.2:p.Tyr72His
NP_005189.2:p.Tyr72His
LRG_855t1:c.214T>C
LRG_855:g.5432T>C
LRG_855p1:p.Tyr72His
NC_000022.10:g.51020997A>G
NM_005198.4:c.214T>C
NR_027928.2:n.432T>C

Protein change:

Y72H

Links:

dbSNP: rs747691808

NCBI 1000 Genomes Browser:

rs747691808

Molecular consequence:

NM_005198.5:c.214T>C - missense variant - [Sequence Ontology: SO:0001583]
NR_027928.2:n.432T>C - non-coding transcript variant - [Sequence Ontology: SO:0001619]

Condition(s)

Name:: Megaconial type congenital muscular dystrophy (MDCMC)
Synonyms:: MUSCULAR DYSTROPHY, CONGENITAL, WITH MITOCHONDRIAL STRUCTURAL ABNORMALITIES; CHKB-Related Muscle Diseases
Identifiers:: MONDO: MONDO:0011246; MedGen: C1865233; Orphanet: 280671; OMIM: 602541

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000940086	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Oct 18, 2022)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001311337	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 13, 2018)	germline	clinical testing	Citation Link

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000940086

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Oct 18, 2022)

germline

clinical testing

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

SCV001311337

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 13, 2018)

germline

clinical testing

Citation Link

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, SCV000940086.5

#	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 tyrosine, which is neutral and polar, with histidine, which is basic and polar, at codon 72 of the CHKB protein (p.Tyr72His). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with CHKB-related conditions. ClinVar contains an entry for this variant (Variation ID: 646146). 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 CHKB 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 Illumina Laboratory Services, Illumina, SCV001311337.1

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

Description

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	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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