dbSNP rs762144739: SMPD4:p.Gly766Ala (chr2-130152742-C-G) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_017951.5(SMPD4):c.2297G>C(p.Gly766Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,439,926 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G766D) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

SMPD4
NM_017951.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.21

Publications

0 publications found

Variant links:

Genes affected

SMPD4 (HGNC:32949): (sphingomyelin phosphodiesterase 4) The protein encoded by this gene is a sphingomyelinase that catalyzes the hydrolysis of membrane sphingomyelin to form phosphorylcholine and ceramide. This gene is activated by DNA damage, cellular stress, and tumor necrosis factor, but it is downregulated by wild-type p53. The encoded protein localizes to the endoplasmic reticulum and Golgi network. [provided by RefSeq, Mar 2017]

SMPD4 Gene-Disease associations (from GenCC):

neurodevelopmental disorder with microcephaly, arthrogryposis, and structural brain anomalies
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

SMPD4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2793811).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMPD4	NM_017951.5 link	c.2297G>C	p.Gly766Ala	missense_variant	Exon 20 of 20	ENST00000680298.1	NP_060421.3	Q9NXE4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMPD4	ENST00000680298.1 link	c.2297G>C	p.Gly766Ala	missense_variant	Exon 20 of 20		NM_017951.5	ENSP00000506463.1		A0A7P0TB24

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.0000118

AC:

AN:

1439926

Hom.:

Cov.:

AF XY:

0.00000840

AC XY:

AN XY:

714610

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33134

American (AMR)

AF:

0.00

AC:

AN:

40880

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25634

East Asian (EAS)

AF:

0.00

AC:

AN:

38730

South Asian (SAS)

AF:

0.00

AC:

AN:

83770

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5012

European-Non Finnish (NFE)

AF:

0.0000145

AC:

AN:

1102678

Other (OTH)

AF:

0.0000168

AC:

AN:

59488

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000283

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.073

BayesDel_noAF

Benign

-0.34

CADD

Benign

(source)

DANN

Uncertain

0.99

Eigen

Benign

-0.13

Eigen_PC

Benign

-0.071

FATHMM_MKL

Benign

0.70

LIST_S2

Uncertain

0.90

D;D;D

M_CAP

Benign

0.014

MetaRNN

Benign

0.28

T;T;T

MetaSVM

Benign

-1.0

PhyloP100

2.2

PrimateAI

Uncertain

0.62

PROVEAN

Benign

-1.9

N;N;N

REVEL

Benign

0.12

Sift

Benign

0.30

T;T;T

Sift4G

Benign

0.37

T;T;T

Vest4

0.40

MVP

0.40

MPC

0.94

ClinPred

0.53

GERP RS

4.6

Varity_R

0.098

gMVP

0.36

Mutation Taster

=91/9

polymorphism

(source)

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

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rs762144739

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over