Genetic Variant GBA3:p.Pro181Leu (chr4-22747551-C-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The ENST00000508166.5(GBA3):c.542C>T(p.Pro181Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000168 in 1,613,820 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00016 ( 0 hom. )

Consequence

GBA3
ENST00000508166.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.17

Variant links:

Genes affected

GBA3 (HGNC:19069): (glucosylceramidase beta 3 (gene/pseudogene)) The protein encoded by this gene is a cytosolic enzyme that can hydrolyze several types of glycosides. The enzyme has its highest activity at neutral pH and is predominantly expressed in human liver, kidney, intestine, and spleen. This gene is a polymorphic pseudogene, with the most common allele being the functional allele that encodes the full-length protein. Some individuals contain a single nucleotide polymorphism that results in a premature stop codon in the coding region, and therefore this allele is pseudogenic due to the failure to produce a functional full-length protein. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Apr 2022]

GBA3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.777

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank
GBA3	NR_102355.2 link	n.621C>T	non_coding_transcript_exon_variant	Exon 3 of 5
GBA3	NR_102357.2 link	n.543C>T	non_coding_transcript_exon_variant	Exon 3 of 5
GBA3	NR_102356.2 link	n.365+11343C>T	intron_variant	Intron 2 of 2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	Protein
GBA3	ENST00000508166.5 link	c.542C>T	p.Pro181Leu	missense_variant	Exon 3 of 5	1	ENSP00000427458.1
GBA3	ENST00000503442.1 link	c.286+11343C>T		intron_variant	Intron 2 of 2	1	ENSP00000422220.1
GBA3	ENST00000511446.2 link	c.29C>T	p.Pro10Leu	missense_variant	Exon 3 of 5	2	ENSP00000423754.1

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00179

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000205

AC:

AN:

249008

Hom.:

AF XY:

0.000192

AC XY:

AN XY:

135088

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.00102

Gnomad NFE exome

AF:

0.000222

Gnomad OTH exome

AF:

0.000331

GnomAD4 exome

AF:

0.000164

AC:

240

AN:

1461684

Hom.:

Cov.:

AF XY:

0.000139

AC XY:

101

AN XY:

727118

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000464

Gnomad4 FIN exome

AF:

0.000805

Gnomad4 NFE exome

AF:

0.000162

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.000204

AC:

AN:

152136

Hom.:

Cov.:

AF XY:

0.000229

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00179

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000159

Hom.:

Bravo

AF:

0.000102

ExAC

AF:

0.000207

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 03, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.542C>T (p.P181L) alteration is located in exon 3 (coding exon 3) of the GBA3 gene. This alteration results from a C to T substitution at nucleotide position 542, causing the proline (P) at amino acid position 181 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.096

BayesDel_noAF

Pathogenic

0.22

CADD

Uncertain

DANN

Uncertain

1.0

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.68

MetaRNN

Pathogenic

0.78

PrimateAI

Benign

0.44

Vest4

0.86

MVP

0.63

GERP RS

5.2

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.080

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over