rs1555133430

Variant names:

• chr11-64747221-C-G
• rs1555133430
• NM_005609.4:c.2312+3G>C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_005609.4(PYGM):​c.2312+3G>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PYGM NM_005609.4 splice_region, intron
• Scores: Splicing: ADA: 0.9971
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.11

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, max_spliceai. No scorers claiming Uncertain. Scorers claiming Benign: dbscSNV1_RF.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PYGM	NM_005609.4	c.2312+3G>C		splice_region_variant, intron_variant	Intron 18 of 19	ENST00000164139.4	NP_005600.1
PYGM	NM_001164716.1	c.2048+3G>C		splice_region_variant, intron_variant	Intron 16 of 17		NP_001158188.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PYGM	ENST00000164139.4	c.2312+3G>C		splice_region_variant, intron_variant	Intron 18 of 19	1	NM_005609.4	ENSP00000164139.3
PYGM	ENST00000377432.7	c.2048+3G>C		splice_region_variant, intron_variant	Intron 16 of 17	2		ENSP00000366650.3
PYGM	ENST00000483742.1	n.1665+3G>C		splice_region_variant, intron_variant	Intron 1 of 2	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Glycogen storage disease, type V Uncertain:1

Oct 18, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.34
CADD	Benign	20
DANN	Benign	0.90

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Benign	0.70
SpliceAI score (max)		0.86		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.23		Position offset: 49
DS_DG_spliceai		0.86		Position offset: -26
DS_DL_spliceai		0.37		Position offset: 3

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555133430; hg19: chr11-64514693;