NM_000158.4:c.415G>T

Variant names:

• chr3-81670852-C-A
• rs1553690406
• NM_000158.4:c.415G>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000158.4(GBE1):​c.415G>T​(p.Gly139*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000286 in 1,398,792 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000029 (0 hom.)
• Consequence: GBE1 NM_000158.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 4.23
• Publications: 0 publications found

Genes affected

GBE1 (HGNC:4180): (1,4-alpha-glucan branching enzyme 1) The protein encoded by this gene is a glycogen branching enzyme that catalyzes the transfer of alpha-1,4-linked glucosyl units from the outer end of a glycogen chain to an alpha-1,6 position on the same or a neighboring glycogen chain. Branching of the chains is essential to increase the solubility of the glycogen molecule and, consequently, in reducing the osmotic pressure within cells. Highest level of this enzyme are found in liver and muscle. Mutations in this gene are associated with glycogen storage disease IV (also known as Andersen's disease). [provided by RefSeq, Jul 2008]

GBE1 Gene-Disease associations (from GenCC):

• glycogen storage disease due to glycogen branching enzyme deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Laboratory for Molecular Medicine, Ambry Genetics, G2P, ClinGen
• adult polyglucosan body disease

  Inheritance: AR Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 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 3-81670852-C-A is Pathogenic according to our data. Variant chr3-81670852-C-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 435291.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GBE1	NM_000158.4	c.415G>T	p.Gly139*	stop_gained	Exon 3 of 16	ENST00000429644.7	NP_000149.4
GBE1	XR_007095662.1	n.543G>T		non_coding_transcript_exon_variant	Exon 3 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GBE1	ENST00000429644.7	c.415G>T	p.Gly139*	stop_gained	Exon 3 of 16	1	NM_000158.4	ENSP00000410833.2
GBE1	ENST00000489715.1	c.292G>T	p.Gly98*	stop_gained	Exon 3 of 16	2		ENSP00000419638.1
GBE1	ENST00000477426.1	n.131G>T		non_coding_transcript_exon_variant	Exon 1 of 2	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000286 AC: 4 AN: 1398792 Hom.: 0 Cov.: 27 AF XY: 0.00000288 AC XY: 2 AN XY: 694202

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 29698

American (AMR) AF: 0.00 AC: 0 AN: 32182

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24536

East Asian (EAS) AF: 0.00 AC: 0 AN: 37300

South Asian (SAS) AF: 0.0000135 AC: 1 AN: 74226

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52700

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5650

European-Non Finnish (NFE) AF: 0.00000277 AC: 3 AN: 1084536

Other (OTH) AF: 0.00 AC: 0 AN: 57964

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.024930), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Glycogen storage disease, type IV Pathogenic:1 Other:1

-

GenomeConnect, ClinGen

Significance: not provided

Review Status: no classification provided

Collection Method: phenotyping only

GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Jan 05, 2016

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Glycogen storage disease, type IV;C1849722:Adult polyglucosan body disease Pathogenic:1

Apr 26, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	39
DANN	Uncertain	0.99
Eigen	Pathogenic	0.98
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.88	D
PhyloP100		4.2
Vest4		0.77
GERP RS		5.5
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1553690406; hg19: chr3-81720003;