8-18056608-T-G

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_177924.5(ASAH1):c.*926A>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.498 in 152,084 control chromosomes in the GnomAD database, including 20,873 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.50 (20873 hom., cov: 33)
  • Failed GnomAD Quality Control
• Consequence: ASAH1 NM_177924.5 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.423

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]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 8-18056608-T-G is Benign according to our data. Variant chr8-18056608-T-G is described in ClinVar as [Benign]. Clinvar id is 362354.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.639 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASAH1	NM_177924.5	c.*926A>C		3_prime_UTR_variant	14/14	ENST00000637790.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASAH1	ENST00000637790.2	c.*926A>C		3_prime_UTR_variant	14/14	1	NM_177924.5	P2

Frequencies

GnomAD3 genomes AF: 0.499 AC: 75787 AN: 151964 Hom.: 20872 Cov.: 33

Gnomad AFR AF: 0.306

Gnomad AMI AF: 0.719

Gnomad AMR AF: 0.408

Gnomad ASJ AF: 0.539

Gnomad EAS AF: 0.219

Gnomad SAS AF: 0.377

Gnomad FIN AF: 0.605

Gnomad MID AF: 0.611

Gnomad NFE AF: 0.644

Gnomad OTH AF: 0.523

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.498 AC: 75792 AN: 152084 Hom.: 20873 Cov.: 33 AF XY: 0.489 AC XY: 36384 AN XY: 74342

Gnomad4 AFR AF: 0.305

Gnomad4 AMR AF: 0.408

Gnomad4 ASJ AF: 0.539

Gnomad4 EAS AF: 0.219

Gnomad4 SAS AF: 0.376

Gnomad4 FIN AF: 0.605

Gnomad4 NFE AF: 0.644

Gnomad4 OTH AF: 0.526

Alfa AF: 0.579 Hom.: 13685

Bravo AF: 0.477

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Farber lipogranulomatosis Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
Cadd	Benign	7.6
Dann	Benign	0.58

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs3810; hg19: chr8-17914117;