7-44153338-C-T

Variant names:

• chr7-44153338-C-T
• rs1057520109
• NM_000162.5:c.171G>A

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PP2 PP3 PP1 PM2_Supporting PP4_Moderate PS4_Moderate PS2

This summary comes from the ClinGen Evidence Repository: The c.171G>A variant in the glucokinase gene, GCK, causes an amino acid change of methionine to isoleucine at codon 57 (p.(Met57Ile)) of NM_000162.5. This variant is absent from gnomAD v2.1.1 and v4.1 (PM2_Supporting). GCK is defined by the ClinGen MDEP as a gene that has a low rate of benign missense variation and has pathogenic missense variants as a common mechanism of disease (PP2). This variant is predicted to be deleterious by computational evidence, with a REVEL score of 0.988, which is greater than the MDEP VCEP threshold of 0.70 (PP3). This variant was identified in 5 unrelated individuals with hyperglycemia (PS4_Moderate; PMID:24323243, internal lab contributors). In one of these individuals this variant was identified as a de novo occurrence with confirmed parental relationships and a clinical picture higly specific for GCK-hyperglycemia (FBG 5.5-8 mmol/L, HbA1c 5.6-7.6 and negative autoantibodies) (PS2, PP4_Moderate; PMID:24323243). This variant segregated with hyperglycemia, with 2 informative meioses in two families (PP1; internal lab contributors). In summary, c.170T>G meets the criteria to be classified as pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 1.3.0, approved 8/11/2023): PM2_Supporting, PP1, PP2, PP3, PP4_Moderate, PS2). LINK:https://erepo.genome.network/evrepo/ui/classification/CA16618473/MONDO:0015967/086

• Frequency: Genomes: not found (cov: 32)
• Consequence: GCK NM_000162.5 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:5
• Conservation: PhyloP100: 7.88
• Publications: 4 publications found

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

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PS2: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP2: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000162.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCK	NM_000162.5	MANE Select	c.171G>A	p.Met57Ile	missense	Exon 2 of 10	NP_000153.1
	GCK	NM_033507.3		c.174G>A	p.Met58Ile	missense	Exon 2 of 10	NP_277042.1
	GCK	NM_033508.3		c.168G>A	p.Met56Ile	missense	Exon 3 of 11	NP_277043.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCK	ENST00000403799.8	TSL:1 MANE Select	c.171G>A	p.Met57Ile	missense	Exon 2 of 10	ENSP00000384247.3
	GCK	ENST00000395796.8	TSL:1	n.*169G>A		non_coding_transcript_exon	Exon 3 of 11	ENSP00000379142.4
	GCK	ENST00000395796.8	TSL:1	n.*169G>A		3_prime_UTR	Exon 3 of 11	ENSP00000379142.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	-	-	Monogenic diabetes (2)
2	-	-	not provided (2)
1	-	-	Maturity onset diabetes mellitus in young (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.1	H
PhyloP100		7.9
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.99
Sift	Uncertain	0.013	D
Sift4G	Uncertain	0.049	D
Polyphen		0.99	D
Vest4		0.95
MutPred		0.80		Loss of disorder (P = 0.0294)
MVP		0.97
MPC		2.3
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.92
gMVP		0.99
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1057520109; hg19: chr7-44192937;