Genetic Variant ACER1:p.Glu27Lys (chr19-6333473-C-T) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

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

The NM_133492.3(ACER1):c.79G>A(p.Glu27Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000874 in 1,590,872 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 (★).

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000088 ( 0 hom. )

Consequence

ACER1
NM_133492.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.94

Variant links:

Genes affected

ACER1 (HGNC:18356): (alkaline ceramidase 1) 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]

ACER1 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 binding_site (size 0) in uniprot entity ACER1_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.902

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACER1	NM_133492.3 link	c.79G>A	p.Glu27Lys	missense_variant	Exon 1 of 6	ENST00000301452.5	NP_597999.1	Q8TDN7
ACER1	XM_011527673.3 link	c.-37+19883G>A		intron_variant	Intron 2 of 6		XP_011525975.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACER1	ENST00000301452.5 link	c.79G>A	p.Glu27Lys	missense_variant	Exon 1 of 6	1	NM_133492.3	ENSP00000301452.3		Q8TDN7

Frequencies

GnomAD3 genomes

AF:

0.0000854

AC:

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00145

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000163

AC:

AN:

214186

Hom.:

AF XY:

0.000243

AC XY:

AN XY:

115386

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00124

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000107

Gnomad OTH exome

AF:

0.000183

GnomAD4 exome

AF:

0.0000876

AC:

126

AN:

1438564

Hom.:

Cov.:

AF XY:

0.000136

AC XY:

AN XY:

713382

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00136

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000727

Gnomad4 OTH exome

AF:

0.0000840

GnomAD4 genome

AF:

0.0000854

AC:

AN:

152308

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74472

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00145

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000680

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.000141

AC:

Asia WGS

AF:

0.00173

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 21, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.79G>A (p.E27K) alteration is located in exon 1 (coding exon 1) of the ACER1 gene. This alteration results from a G to A substitution at nucleotide position 79, causing the glutamic acid (E) at amino acid position 27 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Uncertain

0.039

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.59

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.51

FATHMM_MKL

Uncertain

0.81

LIST_S2

Uncertain

0.86

M_CAP

Uncertain

0.096

MetaRNN

Pathogenic

0.90

MetaSVM

Uncertain

0.21

MutationAssessor

Benign

1.9

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-3.5

REVEL

Pathogenic

0.70

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.0070

Polyphen

0.99

Vest4

0.97

MutPred

0.88

Gain of methylation at E27 (P = 0.0039);

MVP

0.72

MPC

0.89

ClinPred

0.26

GERP RS

4.9

Varity_R

0.81

gMVP

0.98

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