1-155237426-G-A

Position:

• chr1-155237426-G-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_000157.4(GBA1):​c.914C>T​(p.Pro305Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P305A) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: GBA1 NM_000157.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.74

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]

GBA1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_000157.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-155237427-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 813340.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993
• PP5: Variant 1-155237426-G-A is Pathogenic according to our data. Variant chr1-155237426-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1065557.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GBA1	NM_000157.4	c.914C>T	p.Pro305Leu	missense_variant	7/11	ENST00000368373.8	NP_000148.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GBA1	ENST00000368373.8	c.914C>T	p.Pro305Leu	missense_variant	7/11	1	NM_000157.4	ENSP00000357357.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gaucher disease type I Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

NxGen MDx

Mar 10, 2020

This missense variant c.914C>T( p.Pro305Leu) is in a hotspot (PM1) and is not observed in GnomAD exomes or genomes datasets (PM2). Two other variants at this locus (p.Pro305Arg and p.Pro305Ala) are interpreted as pathogenic/likely pathogenic per Uniprot and using ACMG guidelines (PM5). Computational models indicate pathogenic predictions (PP3). This variant was first reported with neuronopathic forms of Gaucher disease type 2 in Alfonso et al., PMID 11783951 as P266L (c.914C>T) in a homozygote resulting in death at 2 years of age. A second report of this variant was made by Tantawy et al. PMID 23508695 in conjunction with Asn370Ser. We interpret c.914C>T to be likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;D;.;.
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	.;D;D;D
M_CAP	Pathogenic	0.91	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.3	M;M;.;.
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-9.0	D;D;D;D
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.93
MutPred		0.89		Loss of disorder (P = 0.0411);Loss of disorder (P = 0.0411);.;.;
MVP		0.98
MPC		1.9
ClinPred		1.0	D
GERP RS		3.5
Varity_R		0.96
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-155207217;