1-155235197-G-C

Position:

• chr1-155235197-G-C

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000157.4(GBA1):​c.1503C>G​(p.Asn501Lys) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000479 in 1,461,390 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 25)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: GBA1 NM_000157.4 missense, splice_region
• Scores: Splicing: ADA: 0.09635
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 4.54

Genes affected

GBA1 (HGNC:4177): (glucosylceramidase beta 1) This gene encodes a lysosomal membrane protein that cleaves the beta-glucosidic linkage of glycosylceramide, an intermediate in glycolipid metabolism. Mutations in this gene cause Gaucher disease, a lysosomal storage disease characterized by an accumulation of glucocerebrosides. A related pseudogene is approximately 12 kb downstream of this gene on chromosome 1. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a glycosylation_site N-linked (GlcNAc...) asparagine (size 0) in uniprot entity GBA1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000157.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 1-155235197-G-C is Pathogenic according to our data. Variant chr1-155235197-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 691989.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GBA1	NM_000157.4	c.1503C>G	p.Asn501Lys	missense_variant, splice_region_variant	10/11	ENST00000368373.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GBA1	ENST00000368373.8	c.1503C>G	p.Asn501Lys	missense_variant, splice_region_variant	10/11	1	NM_000157.4	P1

Frequencies

GnomAD3 genomes Cov.: 25

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461390 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727006

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 25

Bravo AF: 0.00000756

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Jul 13, 2021

- -

Gaucher disease type II Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

May 31, 2017

This missense variant has been reported in one patient with Gaucher disease, and reported in another study in a patient with Parkinson disease (PMID: 20301446, 27717005). This variant affects a highly conserved amino acid and is located in a region that contains multiple pathogenic variants. The variant is predicted to be damaging by multiple in silico tools. The variant was not found in any of the publically available databases, and is thus presumed to be rare. Based on the available evidence, this variant is classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;D;.;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.77	D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M;M;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.5	D;D;D;D
REVEL	Pathogenic	0.89
Sift	Uncertain	0.0020	D;D;D;D
Sift4G	Uncertain	0.0040	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.93
MutPred		0.94		Gain of methylation at N501 (P = 0.017);Gain of methylation at N501 (P = 0.017);.;.;
MVP		0.98
MPC		2.0
ClinPred		0.99	D
GERP RS		2.2
Varity_R		0.99
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.096
dbscSNV1_RF	Benign	0.43
SpliceAI score (max)		0.13		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

Other links and lift over

dbSNP: rs755265316; hg19: chr1-155204988;