rs193922258

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM2_SupportingPS1_SupportingPVS1

This summary comes from the ClinGen Evidence Repository: The c.1020-1G>C variant in the glucokinase gene, GCK, is predicted to remove a canonical splice acceptor site in intron 8 of NM_000162.5. This variant is predicted to cause skipping of biologically-relevant exon 9 of 10, resulting in deletion of >10% of a protein encoded by a gene in which loss-of-function is an established disease mechanism (PVS1; PMID:19790256). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). This variant was identified in one individual with hyperglycemia; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMID:18248649). The c.1020G>A variant at the same canonical nucleotide has been classified as pathogenic for monogenic diabetes by the ClinGen MDEP, and c.1020G>C has a similar predicted impact by Splice AI (0.99 and 0.99 for Acceptor Loss) (PS1_Supporting). In summary, c.1020-1G>C meets the criteria to be classified as pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP VCEP (specification version 1.3.0; approved 8/11/2023): PVS1, PM2_Supporting, PS1_Supporting.  LINK:https://erepo.genome.network/evrepo/ui/classification/CA213704/MONDO:0015967/086

Frequency

Genomes: not found (cov: 33)

Consequence

GCK
ENST00000459642.1 non_coding_transcript_exon

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic reviewed by expert panel P:2

Conservation

PhyloP100: 6.04

Publications

0 publications found

Variant links:

Genes affected

GCK (HGNC:4195): (glucokinase) This gene encodes a member of the hexokinase family of proteins. Hexokinases phosphorylate glucose to produce glucose-6-phosphate, the first step in most glucose metabolism pathways. In contrast to other forms of hexokinase, this enzyme is not inhibited by its product glucose-6-phosphate but remains active while glucose is abundant. The use of multiple promoters and alternative splicing of this gene result in distinct protein isoforms that exhibit tissue-specific expression in the pancreas and liver. In the pancreas, this enzyme plays a role in glucose-stimulated insulin secretion, while in the liver, this enzyme is important in glucose uptake and conversion to glycogen. Mutations in this gene that alter enzyme activity have been associated with multiple types of diabetes and hyperinsulinemic hypoglycemia. [provided by RefSeq, Aug 2017]

GCK Gene-Disease associations (from GenCC):

hyperinsulinism due to glucokinase deficiency
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
maturity-onset diabetes of the young type 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics
monogenic diabetes
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
diabetes mellitus, noninsulin-dependent
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
permanent neonatal diabetes mellitus 1
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
transient neonatal diabetes mellitus
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
maturity-onset diabetes of the young
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
permanent neonatal diabetes mellitus
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GCK links:

ENSG00000300758 (HGNC:):

ENSG00000300758 links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 ACMG points.

PVS1

For more information check the summary or visit ClinGen Evidence Repository.

PS1

For more information check the summary or visit ClinGen Evidence Repository.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCK	NM_000162.5 link	c.1020-1G>C		splice_acceptor_variant, intron_variant	Intron 8 of 9	ENST00000403799.8	NP_000153.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GCK	ENST00000403799.8 link	c.1020-1G>C		splice_acceptor_variant, intron_variant	Intron 8 of 9	1	NM_000162.5	ENSP00000384247.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Maturity-onset diabetes of the young type 2

Pathogenic:1

Aug 18, 2011

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing;curation

Monogenic diabetes

Pathogenic:1

Mar 31, 2024

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Significance:Pathogenic

Review Status:reviewed by expert panel

Collection Method:curation

The c.1020-1G>C variant in the glucokinase gene, GCK, is predicted to remove a canonical splice acceptor site in intron 8 of NM_000162.5. This variant is predicted to cause skipping of biologically-relevant exon 9 of 10, resulting in deletion of >10% of a protein encoded by a gene in which loss-of-function is an established disease mechanism (PVS1; PMID: 19790256). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). This variant was identified in one individual with hyperglycemia; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMID: 18248649). The c.1020G>A variant at the same canonical nucleotide has been classified as pathogenic for monogenic diabetes by the ClinGen MDEP, and c.1020G>C has a similar predicted impact by Splice AI (0.99 and 0.99 for Acceptor Loss) (PS1_Supporting). In summary, c.1020-1G>C meets the criteria to be classified as pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP VCEP (specification version 1.3.0; approved 8/11/2023): PVS1, PM2_Supporting, PS1_Supporting.

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.63

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.0

.;.;.;.;.;.

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.0

.;.;.;.;.;.

MetaRNN

Benign

0.0

.;.;.;.;.;.

MutationAssessor

Benign

0.0

.;.;.;.;.;.

PhyloP100

6.0

PROVEAN

Benign

0.0

.;.;.;.;.;.

REVEL

Benign

0.0

Sift

Pathogenic

0.0

.;.;.;.;.;.

Sift4G

Pathogenic

0.0

.;.;.;.;.;.

Vest4

0.0

GERP RS

4.3

PromoterAI

-0.026

Neutral

(source)

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.91

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.66

Position offset: -23

DS_AL_spliceai

0.99

Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over