rs374895377

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_021267.5(CERS1):c.257C>T(p.Ala86Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000315 in 1,607,730 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00033 ( 1 hom. )

Consequence

CERS1
NM_021267.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.73

Variant links:

Genes affected

CERS1 (HGNC:14253): (ceramide synthase 1) This gene encodes a ceramide synthase enzyme, which catalyzes the synthesis of ceramide, the hydrophobic moiety of sphingolipids. The encoded enzyme synthesizes 18-carbon (C18) ceramide in brain neurons. Elevated expression of this gene may be associated with increased longevity, while decreased expression of this gene may be associated with myoclonus epilepsy with dementia in human patients. This protein is transcribed from a monocistronic mRNA as well as a bicistronic mRNA, which also encodes growth differentiation factor 1. [provided by RefSeq, Jul 2016]

CERS1 links:

GDF1 (HGNC:4214): (growth differentiation factor 1) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate each subunit of the disulfide-linked homodimer. Studies in rodents suggest that this protein is involved in the establishment of left-right asymmetry in early embryogenesis and in neural development in later embryogenesis. The encoded protein is translated from a bicistronic mRNA that also encodes ceramide synthase 1. Mutations in this gene are associated with several congenital cardiovascular malformations. [provided by RefSeq, Jul 2016]

GDF1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CERS1	NM_021267.5 link	c.257C>T	p.Ala86Val	missense_variant	Exon 2 of 8	ENST00000623882.4	NP_067090.1	P27544-1
GDF1	NM_001492.6 link	c.-1066C>T		5_prime_UTR_variant	Exon 2 of 8	ENST00000247005.8	NP_001483.3	P27539A0A024R7N8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CERS1	ENST00000623882.4 link	c.257C>T	p.Ala86Val	missense_variant	Exon 2 of 8	1	NM_021267.5	ENSP00000485308.1	P27544-1
CERS1	ENST00000429504.6 link	c.257C>T	p.Ala86Val	missense_variant	Exon 2 of 6	1		ENSP00000389044.1	P27544-2
GDF1	ENST00000247005.8 link	c.-1066C>T		5_prime_UTR_variant	Exon 2 of 8	1	NM_001492.6	ENSP00000247005.5	P27539
CERS1	ENST00000542296.6 link	c.-38C>T		5_prime_UTR_variant	Exon 2 of 6	1		ENSP00000437648.1	Q5XG75

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152108

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000323

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000128

AC:

AN:

233824

Hom.:

AF XY:

0.000133

AC XY:

AN XY:

127584

show subpopulations

Gnomad AFR exome

AF:

0.000140

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000137

Gnomad FIN exome

AF:

0.0000510

Gnomad NFE exome

AF:

0.000211

Gnomad OTH exome

AF:

0.000174

GnomAD4 exome

AF:

0.000330

AC:

481

AN:

1455622

Hom.:

Cov.:

AF XY:

0.000325

AC XY:

235

AN XY:

723530

show subpopulations

Gnomad4 AFR exome

AF:

0.000239

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.000129

Gnomad4 FIN exome

AF:

0.0000578

Gnomad4 NFE exome

AF:

0.000396

Gnomad4 OTH exome

AF:

0.000299

GnomAD4 genome

AF:

0.000171

AC:

AN:

152108

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74302

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000323

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000938

Hom.:

Bravo

AF:

0.000136

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000242

AC:

ExAC

AF:

0.000158

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 09, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.257C>T (p.A86V) alteration is located in exon 2 (coding exon 2) of the CERS1 gene. This alteration results from a C to T substitution at nucleotide position 257, causing the alanine (A) at amino acid position 86 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Aug 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Progressive myoclonic epilepsy type 8

Uncertain:1

Nov 15, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CERS1 protein function. ClinVar contains an entry for this variant (Variation ID: 542127). This variant has not been reported in the literature in individuals affected with CERS1-related conditions. This variant is present in population databases (rs374895377, gnomAD 0.02%). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 86 of the CERS1 protein (p.Ala86Val). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.66

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.33

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.59

D;.

Eigen

Uncertain

0.21

Eigen_PC

Benign

0.18

FATHMM_MKL

Uncertain

0.87

LIST_S2

Benign

0.82

T;T

M_CAP

Benign

0.040

MetaRNN

Uncertain

0.58

D;D

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.6

L;L

PrimateAI

Uncertain

0.78

PROVEAN

Uncertain

-2.9

.;D

REVEL

Benign

0.16

Sift

Uncertain

0.0070

.;D

Sift4G

Uncertain

0.0080

D;D

Polyphen

0.94

P;.

Vest4

0.60

MVP

0.68

ClinPred

0.10

GERP RS

3.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.14

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