Genetic Variant NM_002862.4:c.619G>T (chr20-25274682-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_002862.4(PYGB):c.619G>T(p.Val207Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000477 in 1,613,616 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000049 ( 0 hom. )

Consequence

PYGB
NM_002862.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.20

Variant links:

Genes affected

PYGB (HGNC:9723): (glycogen phosphorylase B) The protein encoded by this gene is a glycogen phosphorylase found predominantly in the brain. The encoded protein forms homodimers which can associate into homotetramers, the enzymatically active form of glycogen phosphorylase. The activity of this enzyme is positively regulated by AMP and negatively regulated by ATP, ADP, and glucose-6-phosphate. This enzyme catalyzes the rate-determining step in glycogen degradation. [provided by RefSeq, Jul 2008]

PYGB 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
PYGB	NM_002862.4 link	c.619G>T	p.Val207Leu	missense_variant	Exon 5 of 20	ENST00000216962.9	NP_002853.2	P11216
PYGB	XM_047440342.1 link	c.619G>T	p.Val207Leu	missense_variant	Exon 5 of 16		XP_047296298.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PYGB	ENST00000216962.9 link	c.619G>T	p.Val207Leu	missense_variant	Exon 5 of 20	1	NM_002862.4	ENSP00000216962.3		P11216

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152232

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000140

AC:

AN:

250714

Hom.:

AF XY:

0.000170

AC XY:

AN XY:

135502

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:

0.00

Gnomad FIN exome

AF:

0.0000937

Gnomad NFE exome

AF:

0.000291

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000493

AC:

AN:

1461384

Hom.:

Cov.:

AF XY:

0.0000564

AC XY:

AN XY:

727018

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:

0.00

Gnomad4 FIN exome

AF:

0.0000755

Gnomad4 NFE exome

AF:

0.0000585

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74374

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:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000655

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.000264

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Dec 06, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.619G>T (p.V207L) alteration is located in exon 5 (coding exon 5) of the PYGB gene. This alteration results from a G to T substitution at nucleotide position 619, causing the valine (V) at amino acid position 207 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.52

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Pathogenic

0.23

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.72

Eigen

Uncertain

0.24

Eigen_PC

Benign

0.16

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.94

M_CAP

Uncertain

0.27

MetaRNN

Uncertain

0.66

MetaSVM

Pathogenic

0.89

MutationAssessor

Pathogenic

3.0

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-2.3

REVEL

Pathogenic

0.81

Sift

Uncertain

0.018

Sift4G

Uncertain

0.042

Polyphen

0.85

Vest4

0.43

MutPred

0.75

Loss of phosphorylation at Y204 (P = 0.1199);

MVP

0.93

MPC

0.59

ClinPred

0.67

GERP RS

3.3

Varity_R

0.38

gMVP

0.71

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