8-18057568-A-G

Position:

chr8-18057568-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_177924.5(ASAH1):c.1154T>C(p.Leu385Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000156 in 1,604,438 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 (★). Synonymous variant affecting the same amino acid position (i.e. L385L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000069 ( 0 hom. )

Consequence

ASAH1
NM_177924.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter P:2U:2

Conservation

PhyloP100: 8.65

Variant links:

Genes affected

ASAH1 (HGNC:735): (N-acylsphingosine amidohydrolase 1) This gene encodes a member of the acid ceramidase family of proteins. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed. Processing of this preproprotein generates alpha and beta subunits that heterodimerize to form the mature lysosomal enzyme, which catalyzes the degradation of ceramide into sphingosine and free fatty acid. This enzyme is overexpressed in multiple human cancers and may play a role in cancer progression. Mutations in this gene are associated with the lysosomal storage disorder, Farber lipogranulomatosis, and a neuromuscular disorder, spinal muscular atrophy with progressive myoclonic epilepsy. [provided by RefSeq, Oct 2015]

ASAH1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_177924.5

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.89

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASAH1	NM_177924.5 linkuse as main transcript	c.1154T>C	p.Leu385Pro	missense_variant	14/14	ENST00000637790.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASAH1	ENST00000637790.2 linkuse as main transcript	c.1154T>C	p.Leu385Pro	missense_variant	14/14	1	NM_177924.5	P2	Q13510-1

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000362

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000796

AC:

AN:

251398

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135858

show subpopulations

Gnomad AFR exome

AF:

0.000123

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000689

AC:

AN:

1452180

Hom.:

Cov.:

AF XY:

0.00000692

AC XY:

AN XY:

722620

show subpopulations

Gnomad4 AFR exome

AF:

0.000301

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000985

AC:

AN:

152258

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74464

show subpopulations

Gnomad4 AFR

AF:

0.000361

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000868

Hom.:

Bravo

AF:

0.0000793

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Keloid formation

Pathogenic:2

Likely pathogenic, no assertion criteria provided	research	University of Washington Center for Mendelian Genomics, University of Washington	-	- -
Pathogenic, no assertion criteria provided	research	Reichenberger Lab, Center for Regenerative Medicine and Skeletal Development, UConn Health Center	Apr 03, 2017	- -

Variant of unknown significance

Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

OMIM

Sep 02, 2022

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 08, 2022

This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 385 of the ASAH1 protein (p.Leu385Pro). This variant is present in population databases (rs368345612, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with ASAH1-related conditions. ClinVar contains an entry for this variant (Variation ID: 417797). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.80

BayesDel_addAF

Pathogenic

0.20

BayesDel_noAF

Pathogenic

0.28

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.87

D;D;D;.;T;T;T;T;T;T;T;.;.;.

Eigen

Pathogenic

0.71

Eigen_PC

Pathogenic

0.67

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

.;D;D;D;D;.;D;D;D;D;D;D;D;D

M_CAP

Uncertain

0.24

MetaRNN

Pathogenic

0.89

D;D;D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.31

MutationAssessor

Uncertain

2.9

M;M;.;.;.;.;.;.;.;.;.;.;.;.

MutationTaster

Benign

1.0

D;D;D;D;D

PrimateAI

Benign

0.47

PROVEAN

Pathogenic

-4.8

.;D;D;D;.;.;.;.;.;.;.;.;.;D

REVEL

Pathogenic

0.85

Sift

Uncertain

0.0010

.;D;D;D;.;.;.;.;.;.;.;.;.;D

Sift4G

Uncertain

0.0050

.;D;D;D;.;.;.;.;.;.;.;.;.;D

Polyphen

0.98

D;D;D;P;.;.;.;.;.;.;.;.;.;.

Vest4

0.75, 0.74, 0.74, 0.75

MVP

0.97

MPC

0.0062

ClinPred

0.99

GERP RS

5.5

Varity_R

0.97

gMVP

0.99

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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