rs770074196

Positions:

• chr10-89223821-CA-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000235.4(LIPA):​c.684del​(p.Phe228LeufsTer13) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000044 in 1,613,876 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000047 (0 hom.)
• Consequence: LIPA NM_000235.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.01

Genes affected

LIPA (HGNC:6617): (lipase A, lysosomal acid type) This gene encodes lipase A, the lysosomal acid lipase (also known as cholesterol ester hydrolase). This enzyme functions in the lysosome to catalyze the hydrolysis of cholesteryl esters and triglycerides. Mutations in this gene can result in Wolman disease and cholesteryl ester storage disease. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-89223821-CA-C is Pathogenic according to our data. Variant chr10-89223821-CA-C is described in ClinVar as [Pathogenic]. Clinvar id is 553192.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LIPA	NM_000235.4	c.684del	p.Phe228LeufsTer13	frameshift_variant	7/10	ENST00000336233.10	NP_000226.2
LIPA	NM_001127605.3	c.684del	p.Phe228LeufsTer13	frameshift_variant	7/10		NP_001121077.1
LIPA	NM_001288979.2	c.336del	p.Phe112LeufsTer13	frameshift_variant	5/8		NP_001275908.1
LIPA	XM_024448023.2	c.684del	p.Phe228LeufsTer13	frameshift_variant	7/10		XP_024303791.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LIPA	ENST00000336233.10	c.684del	p.Phe228LeufsTer13	frameshift_variant	7/10	1	NM_000235.4	ENSP00000337354	P1
LIPA	ENST00000428800.5	c.684del	p.Phe228LeufsTer13	frameshift_variant	6/7	1		ENSP00000388415
LIPA	ENST00000371837.5	c.516del	p.Phe172LeufsTer13	frameshift_variant	6/9	2		ENSP00000360903
LIPA	ENST00000456827.5	c.336del	p.Phe112LeufsTer13	frameshift_variant	5/8	3		ENSP00000413019

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 152074 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000797 AC: 2 AN: 250966 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135752

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000472 AC: 69 AN: 1461802 Hom.: 0 Cov.: 32 AF XY: 0.0000413 AC XY: 30 AN XY: 727208

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: 0.0000612

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152074 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74264

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000227

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Lysosomal acid lipase deficiency Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Aug 04, 2017	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

Wolman disease Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 20, 2023

This sequence change creates a premature translational stop signal (p.Phe228Leufs*13) in the LIPA gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LIPA are known to be pathogenic (PMID: 23485521). This variant is present in population databases (rs770074196, gnomAD 0.007%). This premature translational stop signal has been observed in individuals with cholesteryl ester storage disease (PMID: 10562460, 10627498). ClinVar contains an entry for this variant (Variation ID: 553192). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. Experimental studies have shown that this premature translational stop signal affects LIPA function (PMID: 29196158). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs770074196; hg19: chr10-90983578;