12-21546416-A-T

Variant names:

Variant summary

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

The NM_021957.4(GYS2):c.1477T>A(p.Tyr493Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000926 in 1,597,738 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000096 ( 1 hom. )

Consequence

GYS2
NM_021957.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 7.26

Variant links:

Genes affected

GYS2 (HGNC:4707): (glycogen synthase 2) The protein encoded by this gene, liver glycogen synthase, catalyzes the rate-limiting step in the synthesis of glycogen - the transfer of a glucose molecule from UDP-glucose to a terminal branch of the glycogen molecule. Mutations in this gene cause glycogen storage disease type 0 (GSD-0) - a rare type of early childhood fasting hypoglycemia with decreased liver glycogen content. [provided by RefSeq, Dec 2009]

GYS2 links:

ENSG00000285854 (HGNC:):

ENSG00000285854 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
GYS2	NM_021957.4 link	c.1477T>A	p.Tyr493Asn	missense_variant	Exon 12 of 16	ENST00000261195.3	NP_068776.2	P54840
GYS2	XM_024448960.2 link	c.1477T>A	p.Tyr493Asn	missense_variant	Exon 12 of 17		XP_024304728.1
GYS2	XM_006719063.4 link	c.1246T>A	p.Tyr416Asn	missense_variant	Exon 11 of 15		XP_006719126.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GYS2	ENST00000261195.3 link	c.1477T>A	p.Tyr493Asn	missense_variant	Exon 12 of 16	1	NM_021957.4	ENSP00000261195.2	P54840
ENSG00000285854	ENST00000647960.1 link	n.*1479T>A		non_coding_transcript_exon_variant	Exon 19 of 23			ENSP00000497202.1	A0A3B3IS95
ENSG00000285854	ENST00000647960.1 link	n.*1479T>A		3_prime_UTR_variant	Exon 19 of 23			ENSP00000497202.1	A0A3B3IS95

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152126

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00186

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000164

AC:

AN:

250150

Hom.:

AF XY:

0.000259

AC XY:

AN XY:

135198

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00135

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000962

AC:

139

AN:

1445496

Hom.:

Cov.:

AF XY:

0.000142

AC XY:

102

AN XY:

720120

show subpopulations

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:

0.00156

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000836

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152242

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

74452

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00186

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Glycogen storage disorder due to hepatic glycogen synthase deficiency

Uncertain:1

Mar 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 521873). 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. This variant has not been reported in the literature in individuals affected with GYS2-related conditions. This variant is present in population databases (rs539369206, gnomAD 0.1%), including at least one homozygous and/or hemizygous individual. This sequence change replaces tyrosine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 493 of the GYS2 protein (p.Tyr493Asn). -

Inborn genetic diseases

Uncertain:1

Sep 01, 2017

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.87

BayesDel_addAF

Uncertain

0.031

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.78

Eigen

Pathogenic

0.77

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Uncertain

0.97

LIST_S2

Pathogenic

0.99

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.57

MetaSVM

Uncertain

0.47

MutationAssessor

Pathogenic

3.4

PrimateAI

Pathogenic

0.90

PROVEAN

Pathogenic

-8.6

REVEL

Pathogenic

0.87

Sift

Uncertain

0.012

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.85

MutPred

0.77

Gain of disorder (P = 0.0264);

MVP

0.91

MPC

0.70

ClinPred

0.48

GERP RS

4.5

Varity_R

0.76

gMVP

0.94

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over