rs781668874
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate
The NM_020944.3(GBA2):c.1947+4A>T variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,548 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
GBA2
NM_020944.3 splice_donor_region, intron
NM_020944.3 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.9999
2
Clinical Significance
Conservation
PhyloP100: 3.13
Genes affected
GBA2 (HGNC:18986): (glucosylceramidase beta 2) This gene encodes a microsomal beta-glucosidase that catalyzes the hydrolysis of bile acid 3-O-glucosides as endogenous compounds. Studies to determine subcellular localization of this protein in the liver indicated that the enzyme was mainly enriched in the microsomal fraction where it appeared to be confined to the endoplasmic reticulum. This putative transmembrane protein is thought to play a role in carbohydrate transport and metabolism. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. No scorers claiming Benign.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
GBA2 | NM_020944.3 | c.1947+4A>T | splice_donor_region_variant, intron_variant | ENST00000378103.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
GBA2 | ENST00000378103.7 | c.1947+4A>T | splice_donor_region_variant, intron_variant | 1 | NM_020944.3 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
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32
GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251420Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135886
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GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461548Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 727102
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GnomAD4 genome ? Cov.: 32
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Spastic paraplegia Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Oct 25, 2017 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Nucleotide substitutions within the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site, but this prediction has not been confirmed by published transcriptional studies. This variant has not been reported in the literature in individuals with GBA2-related disease. This variant is present in population databases (rs781668874, ExAC 0.009%). This sequence change falls in intron 12 of the GBA2 gene. It does not directly change the encoded amino acid sequence of the GBA2 protein, but it affects a nucleotide within the consensus splice site of the intron. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
Cadd
Uncertain
Dann
Benign
Splicing
Name
Calibrated prediction
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Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DG_spliceai
Position offset: -32
DS_DL_spliceai
Position offset: 4
Find out detailed SpliceAI scores and Pangolin per-transcript scores at