chr7-44179739-A-G

Variant names:

• chr7-44179739-A-G
• rs2300584
• NM_000162.5:c.45+9170T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000162.5(GCK):​c.45+9170T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.2 in 152,236 control chromosomes in the GnomAD database, including 3,124 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.20 (3124 hom., cov: 32)
• Consequence: GCK NM_000162.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0270
• Publications: 10 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

ENSG00000307930 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.223 is higher than 0.05.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCK	NM_000162.5	MANE Select	c.45+9170T>C		intron	N/A	NP_000153.1
	GCK	NM_001354800.1		c.45+9170T>C		intron	N/A	NP_001341729.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCK	ENST00000403799.8	TSL:1 MANE Select	c.45+9170T>C		intron	N/A	ENSP00000384247.3
	GCK	ENST00000671824.1		c.45+9170T>C		intron	N/A	ENSP00000500264.1
	GCK	ENST00000673284.1		c.45+9170T>C		intron	N/A	ENSP00000499852.1

Frequencies

GnomAD3 genomes AF: 0.200 AC: 30391 AN: 152118 Hom.: 3133 Cov.: 32

Gnomad AFR AF: 0.133

Gnomad AMI AF: 0.206

Gnomad AMR AF: 0.230

Gnomad ASJ AF: 0.188

Gnomad EAS AF: 0.135

Gnomad SAS AF: 0.205

Gnomad FIN AF: 0.286

Gnomad MID AF: 0.234

Gnomad NFE AF: 0.225

Gnomad OTH AF: 0.215

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.200 AC: 30372 AN: 152236 Hom.: 3124 Cov.: 32 AF XY: 0.204 AC XY: 15148 AN XY: 74426

African (AFR) AF: 0.133 AC: 5515 AN: 41554

American (AMR) AF: 0.229 AC: 3506 AN: 15304

Ashkenazi Jewish (ASJ) AF: 0.188 AC: 654 AN: 3470

East Asian (EAS) AF: 0.135 AC: 699 AN: 5192

South Asian (SAS) AF: 0.204 AC: 984 AN: 4824

European-Finnish (FIN) AF: 0.286 AC: 3028 AN: 10586

Middle Eastern (MID) AF: 0.218 AC: 64 AN: 294

European-Non Finnish (NFE) AF: 0.225 AC: 15284 AN: 67988

Other (OTH) AF: 0.213 AC: 450 AN: 2112

Alfa AF: 0.173 Hom.: 658

Bravo AF: 0.193

Asia WGS AF: 0.163 AC: 570 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	3.9
DANN	Benign	0.56
PhyloP100		0.027
Mutation Taster		=100/0	polymorphism (auto)

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: rs2300584; hg19: chr7-44219338;