14-50908981-TA-T

Position:

• chr14-50908981-TA-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP6

The NM_002863.5(PYGL):​c.2178-27del variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,383,860 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in Lovd as Benign (no stars). There are indicators that this mutation may affect the branch point..

• Frequency:
  • Genomes: not found (cov: 0)
  • Exomes 𝑓: 0.0000087 (0 hom.)
• Consequence: PYGL NM_002863.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.780

Genes affected

PYGL (HGNC:9725): (glycogen phosphorylase L) This gene encodes a homodimeric protein that catalyses the cleavage of alpha-1,4-glucosidic bonds to release glucose-1-phosphate from liver glycogen stores. This protein switches from inactive phosphorylase B to active phosphorylase A by phosphorylation of serine residue 15. Activity of this enzyme is further regulated by multiple allosteric effectors and hormonal controls. Humans have three glycogen phosphorylase genes that encode distinct isozymes that are primarily expressed in liver, brain and muscle, respectively. The liver isozyme serves the glycemic demands of the body in general while the brain and muscle isozymes supply just those tissues. In glycogen storage disease type VI, also known as Hers disease, mutations in liver glycogen phosphorylase inhibit the conversion of glycogen to glucose and results in moderate hypoglycemia, mild ketosis, growth retardation and hepatomegaly. Alternative splicing results in multiple transcript variants encoding different isoforms.[provided by RefSeq, Feb 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 14-50908981-TA-T is Benign according to our data. Variant chr14-50908981-TA-T is described in Lovd as [Benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PYGL	NM_002863.5	c.2178-27del		intron_variant		ENST00000216392.8
PYGL	NM_001163940.2	c.2076-27del		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PYGL	ENST00000216392.8	c.2178-27del		intron_variant		1	NM_002863.5	P1
PYGL	ENST00000532462.5	c.2178-27del		intron_variant		1
PYGL	ENST00000544180.6	c.2076-27del		intron_variant		2
PYGL	ENST00000532107.2	n.351-27del		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome AF: 0.00000867 AC: 12 AN: 1383860 Hom.: 0 Cov.: 33 AF XY: 0.0000101 AC XY: 7 AN XY: 691946

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000393

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000119

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000955

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BranchPoint Hunter		1.0

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr14-51375699;