chr7-44182621-C-G

Variant names:

• chr7-44182621-C-G
• rs2284769
• NM_000162.5:c.45+6288G>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+6288G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0988 in 152,106 control chromosomes in the GnomAD database, including 931 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 0.099 (931 hom., cov: 32)
• Consequence: GCK NM_000162.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.00100
• Publications: 7 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=-0.9).
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.143 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCK	NM_000162.5	c.45+6288G>C		intron_variant	Intron 1 of 9	ENST00000403799.8	NP_000153.1
GCK	NM_001354800.1	c.45+6288G>C		intron_variant	Intron 1 of 10		NP_001341729.1
LOC105375257	XR_927221.3	n.82-681C>G		intron_variant	Intron 1 of 2
LOC105375257	XR_927222.3	n.759+472C>G		intron_variant	Intron 1 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GCK	ENST00000403799.8	c.45+6288G>C		intron_variant	Intron 1 of 9	1	NM_000162.5	ENSP00000384247.3

Frequencies

GnomAD3 genomes AF: 0.0989 AC: 15029 AN: 151988 Hom.: 930 Cov.: 32

Gnomad AFR AF: 0.0248

Gnomad AMI AF: 0.115

Gnomad AMR AF: 0.148

Gnomad ASJ AF: 0.121

Gnomad EAS AF: 0.134

Gnomad SAS AF: 0.0771

Gnomad FIN AF: 0.150

Gnomad MID AF: 0.108

Gnomad NFE AF: 0.122

Gnomad OTH AF: 0.115

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

GnomAD4 genome AF: 0.0988 AC: 15032 AN: 152106 Hom.: 931 Cov.: 32 AF XY: 0.101 AC XY: 7514 AN XY: 74334

African (AFR) AF: 0.0247 AC: 1026 AN: 41528

American (AMR) AF: 0.148 AC: 2262 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.121 AC: 421 AN: 3470

East Asian (EAS) AF: 0.135 AC: 696 AN: 5156

South Asian (SAS) AF: 0.0766 AC: 369 AN: 4818

European-Finnish (FIN) AF: 0.150 AC: 1585 AN: 10566

Middle Eastern (MID) AF: 0.112 AC: 33 AN: 294

European-Non Finnish (NFE) AF: 0.122 AC: 8291 AN: 67974

Other (OTH) AF: 0.115 AC: 244 AN: 2114

Alfa AF: 0.109 Hom.: 127

Bravo AF: 0.0974

Asia WGS AF: 0.0970 AC: 338 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	4.4
DANN	Benign	0.40
PhyloP100		-0.0010
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: rs2284769; hg19: chr7-44222220;