Genetic Variant LIPA:p.Asp221Gly (chr10-89225105-T-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 3P and 5B. PM2PP2BP4_StrongBP6

The NM_000235.4(LIPA):c.662A>G(p.Asp221Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000135 in 1,613,904 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

LIPA
NM_000235.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 5.24

Publications

2 publications found

Variant links:

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]

LIPA Gene-Disease associations (from GenCC):

lysosomal acid lipase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, ClinGen, Myriad Women’s Health, Labcorp Genetics (formerly Invitae)
cholesteryl ester storage disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Wolman disease
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

LIPA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 39 curated pathogenic missense variants (we use a threshold of 10). The gene has 5 curated benign missense variants. Gene score misZ: 0.22832 (below the threshold of 3.09). Trascript score misZ: 0.63421 (below the threshold of 3.09). GenCC associations: The gene is linked to cholesteryl ester storage disease, lysosomal acid lipase deficiency, Wolman disease.

BP4

Computational evidence support a benign effect (MetaRNN=0.011595309).

BP6

Variant 10-89225105-T-C is Benign according to our data. Variant chr10-89225105-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 568571.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000235.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
LIPA	NM_000235.4	MANE Select	c.662A>G	p.Asp221Gly	missense	Exon 6 of 10	NP_000226.2
LIPA	NM_001440836.1		c.794A>G	p.Asp265Gly	missense	Exon 7 of 11	NP_001427765.1
LIPA	NM_001440837.1		c.683A>G	p.Asp228Gly	missense	Exon 6 of 10	NP_001427766.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
LIPA	ENST00000336233.10	TSL:1 MANE Select	c.662A>G	p.Asp221Gly	missense	Exon 6 of 10	ENSP00000337354.5
LIPA	ENST00000428800.5	TSL:1	c.662A>G	p.Asp221Gly	missense	Exon 5 of 7	ENSP00000388415.1
LIPA	ENST00000371837.5	TSL:2	c.494A>G	p.Asp165Gly	missense	Exon 5 of 9	ENSP00000360903.1

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

152080

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00461

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000243

AC:

AN:

251470

AF XY:

0.000235

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00437

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000132

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000133

AC:

195

AN:

1461824

Hom.:

Cov.:

AF XY:

0.000131

AC XY:

AN XY:

727218

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00421

AC:

110

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000349

AC:

AN:

5724

European-Non Finnish (NFE)

AF:

0.0000558

AC:

AN:

1112000

Other (OTH)

AF:

0.000331

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000151

AC:

AN:

152080

Hom.:

Cov.:

AF XY:

0.0000942

AC XY:

AN XY:

74306

show subpopulations

African (AFR)

AF:

0.0000242

AC:

AN:

41380

American (AMR)

AF:

0.000131

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.00461

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68010

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.516

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000433

Hom.:

Bravo

AF:

0.000170

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000465

AC:

ExAC

AF:

0.000198

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

LIPA-related disorder

Uncertain:1

Sep 27, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The LIPA c.662A>G variant is predicted to result in the amino acid substitution p.Asp221Gly. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.43% of alleles in individuals of Ashkenazi Jewish descent in gnomAD, which is likely to frequent for a disease-causing variant. Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence.

Lysosomal acid lipase deficiency

Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

not provided

Uncertain:1

Dec 05, 2017

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Cardiovascular phenotype

Uncertain:1

Apr 27, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.D221G variant (also known as c.662A>G), located in coding exon 5 of the LIPA gene, results from an A to G substitution at nucleotide position 662. The aspartic acid at codon 221 is replaced by glycine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

Wolman disease

Benign:1

Dec 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.26

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.27

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.20

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.55

M_CAP

Benign

0.040

MetaRNN

Benign

0.012

MetaSVM

Benign

-0.79

MutationAssessor

Benign

1.0

PhyloP100

5.2

PrimateAI

Benign

0.32

PROVEAN

Uncertain

-3.2

REVEL

Benign

0.18

Sift

Benign

0.19

Sift4G

Benign

0.17

Polyphen

0.0020

Vest4

0.55

MVP

0.88

MPC

0.50

ClinPred

0.11

GERP RS

5.0

Varity_R

0.37

gMVP

0.74

Mutation Taster

=62/38

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over