3-81536940-C-T

Variant names:

• chr3-81536940-C-T
• rs137852890
• NM_000158.4:c.1774G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000158.4(GBE1):​c.1774G>A​(p.Glu592Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GBE1 NM_000158.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.50
• Publications: 5 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GBE1	NM_000158.4	c.1774G>A	p.Glu592Lys	missense_variant	Exon 13 of 16	ENST00000429644.7	NP_000149.4
GBE1	XR_007095662.1	n.1902G>A		non_coding_transcript_exon_variant	Exon 13 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GBE1	ENST00000429644.7	c.1774G>A	p.Glu592Lys	missense_variant	Exon 13 of 16	1	NM_000158.4	ENSP00000410833.2
GBE1	ENST00000489715.1	c.1651G>A	p.Glu551Lys	missense_variant	Exon 13 of 16	2		ENSP00000419638.1
GBE1	ENST00000484687.1	n.175G>A		non_coding_transcript_exon_variant	Exon 2 of 3	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000122 AC: 1

ExAC AF: 0.00000828 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D;T
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Benign	0.065	D
MetaRNN	Uncertain	0.61	D;D
MetaSVM	Uncertain	0.012	D
MutationAssessor	Benign	1.4	L;.
PhyloP100		7.5
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.6	D;D
REVEL	Uncertain	0.48
Sift	Benign	0.17	T;T
Sift4G	Benign	0.41	T;T
Polyphen		0.73	P;B
Vest4		0.68
MVP		0.85
MPC		0.11
ClinPred		0.96	D
GERP RS		5.3
Varity_R		0.58
gMVP		0.51
Mutation Taster		=48/52	disease causing

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: rs137852890; hg19: chr3-81586091;