chr11-64752493-CTCC-TCA

Position:

• chr11-64752493-CTCC-TCA

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_005609.4(PYGM):​c.1527_1530delinsTGA​(p.Asp511ThrfsTer28) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G509G) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PYGM NM_005609.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 7.93

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-64752493-CTCC-TCA is Pathogenic according to our data. Variant chr11-64752493-CTCC-TCA is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370590.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PYGM	NM_005609.4	c.1527_1530delinsTGA	p.Asp511ThrfsTer28	frameshift_variant	13/20	ENST00000164139.4
PYGM	NM_001164716.1	c.1263_1266delinsTGA	p.Asp423ThrfsTer28	frameshift_variant	11/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PYGM	ENST00000164139.4	c.1527_1530delinsTGA	p.Asp511ThrfsTer28	frameshift_variant	13/20	1	NM_005609.4	P1
PYGM	ENST00000377432.7	c.1263_1266delinsTGA	p.Asp423ThrfsTer28	frameshift_variant	11/18	2

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Glycogen storage disease, type V Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Mar 03, 2016	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 07, 2024	- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1057516612; hg19: chr11-64519965;