2-27496962-G-A

Position:

• chr2-27496962-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001486.4(GCKR):​c.58G>A​(p.Glu20Lys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GCKR NM_001486.4 missense, splice_region
• Scores: Splicing: ADA: 0.9524
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.95

Genes affected

GCKR (HGNC:4196): (glucokinase regulator) This gene encodes a protein belonging to the GCKR subfamily of the SIS (Sugar ISomerase) family of proteins. The gene product is a regulatory protein that inhibits glucokinase in liver and pancreatic islet cells by binding non-covalently to form an inactive complex with the enzyme. This gene is considered a susceptibility gene candidate for a form of maturity-onset diabetes of the young (MODY). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GCKR	NM_001486.4	c.58G>A	p.Glu20Lys	missense_variant, splice_region_variant	1/19	ENST00000264717.7
GCKR	XM_011532763.1	c.58G>A	p.Glu20Lys	missense_variant, splice_region_variant	1/13
GCKR	XR_001738699.1	n.124G>A		splice_region_variant, non_coding_transcript_exon_variant	1/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GCKR	ENST00000264717.7	c.58G>A	p.Glu20Lys	missense_variant, splice_region_variant	1/19	1	NM_001486.4	P1
GCKR	ENST00000472290.1	n.80G>A		splice_region_variant, non_coding_transcript_exon_variant	1/11	1
GCKR	ENST00000417872.5	n.115G>A		splice_region_variant, non_coding_transcript_exon_variant	1/7	4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1459014 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 726070

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.00000378

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 01, 2022

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with GCKR-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 20 of the GCKR protein (p.Glu20Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.37
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.28	T
Eigen	Uncertain	0.48
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.86	D
M_CAP	Uncertain	0.089	D
MetaRNN	Uncertain	0.67	D
MetaSVM	Uncertain	0.040	D
MutationTaster	Benign	0.84	D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-0.51	N
REVEL	Uncertain	0.48
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.044	D
Vest4		0.56
MVP		0.86
MPC		0.20
ClinPred		0.95	D
GERP RS		4.4
gMVP		0.46

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.95
dbscSNV1_RF	Pathogenic	0.89
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

Publications

LitVar

Other links and lift over

dbSNP: rs1245416906; hg19: chr2-27719829; COSMIC: COSV53021227; COSMIC: COSV53021227;