8-18071411-T-G

Variant names:

• chr8-18071411-T-G
• rs12547845
• NM_177924.5:c.126-21A>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_177924.5(ASAH1):​c.126-21A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000758 in 1,318,674 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: ASAH1 NM_177924.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.776
• Publications: 5 publications found

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 Gene-Disease associations (from GenCC):

• ASAH1-related sphingolipidosis

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Farber lipogranulomatosis

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• spinal muscular atrophy-progressive myoclonic epilepsy syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp, G2P

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ASAH1	NM_177924.5	c.126-21A>C		intron_variant	Intron 2 of 13	ENST00000637790.2	NP_808592.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ASAH1	ENST00000637790.2	c.126-21A>C		intron_variant	Intron 2 of 13	1	NM_177924.5	ENSP00000490272.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.58e-7 AC: 1 AN: 1318674 Hom.: 0 Cov.: 20 AF XY: 0.00000152 AC XY: 1 AN XY: 659368

African (AFR) AF: 0.00 AC: 0 AN: 30586

American (AMR) AF: 0.00 AC: 0 AN: 41716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24856

East Asian (EAS) AF: 0.00 AC: 0 AN: 38584

South Asian (SAS) AF: 0.00 AC: 0 AN: 80414

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51402

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5086

European-Non Finnish (NFE) AF: 0.00000101 AC: 1 AN: 990676

Other (OTH) AF: 0.00 AC: 0 AN: 55354

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	0.60
DANN	Benign	0.82
PhyloP100		-0.78

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

Other links and lift over

dbSNP: rs12547845; hg19: chr8-17928920;