rs142234258

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PP3_ModerateBS1_SupportingBS2_Supporting

The NM_005609.4(PYGM):c.660G>A(p.Gln220Gln) variant causes a splice region, synonymous change. The variant allele was found at a frequency of 0.00252 in 1,614,170 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0019 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0026 ( 8 hom. )

Consequence

PYGM
NM_005609.4 splice_region, synonymous

Scores

Splicing: ADA: 0.9997

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:12B:2O:1

Conservation

PhyloP100: 5.02

Publications

4 publications found

Variant links:

Genes affected

PYGM (HGNC:9726): (glycogen phosphorylase, muscle associated) This gene encodes a muscle enzyme involved in glycogenolysis. Highly similar enzymes encoded by different genes are found in liver and brain. Mutations in this gene are associated with McArdle disease (myophosphorylase deficiency), a glycogen storage disease of muscle. Alternative splicing results in multiple transcript variants.[provided by RefSeq, Sep 2009]

PYGM Gene-Disease associations (from GenCC):

glycogen storage disease V
Inheritance: AR, AD Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, Genomics England PanelApp

PYGM links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00185 (282/152340) while in subpopulation SAS AF = 0.00891 (43/4826). AF 95% confidence interval is 0.0068. There are 0 homozygotes in GnomAd4. There are 114 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 8 AR,AD geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005609.4. 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
	PYGM	NM_005609.4	MANE Select	c.660G>A	p.Gln220Gln	splice_region synonymous	Exon 5 of 20	NP_005600.1
	PYGM	NM_001164716.1		c.396G>A	p.Gln132Gln	splice_region synonymous	Exon 3 of 18	NP_001158188.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PYGM	ENST00000164139.4	TSL:1 MANE Select	c.660G>A	p.Gln220Gln	splice_region synonymous	Exon 5 of 20	ENSP00000164139.3
	PYGM	ENST00000377432.7	TSL:2	c.396G>A	p.Gln132Gln	splice_region synonymous	Exon 3 of 18	ENSP00000366650.3

Frequencies

GnomAD3 genomes

AF:

0.00185

AC:

282

AN:

152222

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000458

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00262

Gnomad ASJ

AF:

0.000864

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00870

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00254

Gnomad OTH

AF:

0.00239

GnomAD2 exomes

AF:

0.00209

AC:

524

AN:

251172

AF XY:

0.00244

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.000781

Gnomad ASJ exome

AF:

0.000894

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.00247

Gnomad OTH exome

AF:

0.00261

GnomAD4 exome

AF:

0.00259

AC:

3784

AN:

1461830

Hom.:

Cov.:

AF XY:

0.00277

AC XY:

2018

AN XY:

727220

show subpopulations

African (AFR)

AF:

0.000358

AC:

AN:

33480

American (AMR)

AF:

0.00119

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.000650

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00655

AC:

565

AN:

86256

European-Finnish (FIN)

AF:

0.0000562

AC:

AN:

53382

Middle Eastern (MID)

AF:

0.00364

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00267

AC:

2970

AN:

1111992

Other (OTH)

AF:

0.00237

AC:

143

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

247

495

742

990

1237

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

112

224

336

448

560

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00185

AC:

282

AN:

152340

Hom.:

Cov.:

AF XY:

0.00153

AC XY:

114

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.000457

AC:

AN:

41584

American (AMR)

AF:

0.00255

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.000864

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00891

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00254

AC:

173

AN:

68026

Other (OTH)

AF:

0.00236

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.491

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00222

Hom.:

Bravo

AF:

0.00185

Asia WGS

AF:

0.00433

AC:

AN:

3478

EpiCase

AF:

0.00333

EpiControl

AF:

0.00290

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Glycogen storage disease, type V (8)

not provided (6)

not specified (2)

Tip-toe gait (1)

PYGM-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.26

CADD

Uncertain

(source)

DANN

Benign

0.92

PhyloP100

5.0

Mutation Taster

=5/95

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.97

SpliceAI score (max)

0.65

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.65

Position offset: 16

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over