ACER1
protein-codingalkaline ceramidase 1, the group of Alkaline ceramidases
Gene summary
Ceramides are synthesized during epidermal differentiation and accumulate within the interstices of the stratum corneum, where they represent critical components of the epidermal permeability barrier. Excess cellular ceramide can trigger antimitogenic signals and induce apoptosis, and the ceramide metabolites sphingosine and sphingosine-1-phosphate (S1P) are important bioregulatory molecules. Ceramide hydrolysis in the nucleated cell layers regulates keratinocyte proliferation and apoptosis in response to external stress. Ceramide hydrolysis also occurs at the stratum corneum, releasing free sphingoid base that functions as an endogenous antimicrobial agent. ACER1 is highly expressed in epidermis and catalyzes the hydrolysis of very long chain ceramides to generate sphingosine (Houben et al., 2006 [PubMed 16477081]; Sun et al., 2008 [PubMed 17713573]).[supplied by OMIM, Jul 2010]
- ASAH3
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~27.5 kbGenCC Phenotypes & Disease Associations
Curated gene-disease validity assertions and inheritance patterns
No GenCC data available for this gene.
ClinVar Associated Diseases & Phenotypes
Reported disease conditions connected to ACER1 variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_133492.3. Only rare variants are included.
We include only reliable ClinVar variants with their consequences to MANE Select, MANE Plus Clinical transcripts, or transcripts with TSL equal to 1. Click a count to filter the variants table below.
Slight differences between displayed counts and ClinVar may occur due to a different transcript/consequence chosen by our variant effect predictor, or because we classify Benign/Likely benign as Likely benign and Pathogenic/Likely pathogenic as Likely pathogenic.
| Effect | PathogenicP | Likely pathogenicLP | VUS | Likely benignLB | BenignB | Sum |
|---|---|---|---|---|---|---|
| synonymous | 1 | 1 | ||||
| missense | 44 | 5 | 1 | 50 | ||
| nonsense | 0 | |||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 1 | 1 | ||||
| Total | 0 | 0 | 45 | 6 | 1 | 52 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_597999.1 | 6 | MANE Select | |
| Ensembl | ENSP00000301452.3 | 6 | MANE Select | |
| Ensembl | ENSP00000805487.1 | 6 | Standard | |
| RefSeq | XP_011525975.1 | 5 | Standard |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- Sphingolipid signaling pathway - Homo sapiens (human)
- Sphingolipid metabolism - Homo sapiens (human)
- Sphingolipid Metabolism
- Gaucher Disease
- Globoid Cell Leukodystrophy
Biological Process
- sphingolipid metabolic process
- epidermis development
- response to alkaline pH
- regulation of lipid metabolic process
- sphingolipid biosynthetic process
Molecular Function
- N-acylsphingosine amidohydrolase activity
- dihydroceramidase activity
- ceramidase activity
Cellular Component
- endoplasmic reticulum
- endoplasmic reticulum membrane
- integral component of membrane
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000301452
- Coding exons
- 6
- Length
- 27488
- Individuals with no LoFs
- 125714
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 33
- Defined
- 125747
- p
- 0.000131
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | 0.451 | 147 | 163 | 0.901 | 0.00000968 | 1746 |
| Missense (PolyPhen) | 56 | 55.54 | 1.0083 | 658 | ||
| Synonymous | -0.555 | 69 | 63.4 | 1.09 | 0.00000391 | 491 |
| Loss of Function | 1.57 | 6 | 11.8 | 0.508 | 5.05e-7 | 126 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0.00012 | 0.00012 | rare |
| Latino/Admixed American | 0.000087 | 0.000087 | rare |
| Ashkenazi Jewish | 0.000099 | 0.000099 | rare |
| East Asian | 0.000054 | 0.000054 | rare |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0.00017 | 0.00016 | rare |
| South Asian | 0.00018 | 0.00016 | rare |
| Other | 0.00051 | 0.00049 | rare |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Hydrolyzes the sphingolipid ceramide into sphingosine and free fatty acid at an optimal pH of 8.0. Has a highly restricted substrate specificity for the natural stereoisomer of ceramide with D-erythro-sphingosine but not D-ribo- phytosphingosine or D-erythro-dihydrosphingosine as a backbone. May have a role in regulating the levels of bioactive lipids ceramide and sphingosine 1-phosphate, as well as complex sphingolipids (By similarity). {ECO:0000250}.;
Recessive Scores
- pRec
- 0.110
Intolerance Scores
- LoFtool
- 0.504
- RVIS EVS
- -0.03
- RVIS percentile EVS
- 51.92
Essentials
- Essential (CRISPR)
- N
- Essential (CRISPR2)
- N
- Essential (gene trap)
- N
- Indispensability pred.
- N
- Indispensability score
- 0.308
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |