Genetic Variant SMPD3:p.Cys427Tyr (chr16-68370902-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_018667.4(SMPD3):c.1280G>A(p.Cys427Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000109 in 1,461,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

SMPD3
NM_018667.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.239

Publications

1 publications found

Variant links:

Genes affected

SMPD3 (HGNC:14240): (sphingomyelin phosphodiesterase 3) Predicted to enable phosphatidic acid binding activity; phosphatidylserine binding activity; and sphingomyelin phosphodiesterase activity. Predicted to be involved in positive regulation of exosomal secretion and sphingomyelin metabolic process. Predicted to act upstream of or within several processes, including animal organ development; enzyme linked receptor protein signaling pathway; and sphingolipid metabolic process. Predicted to be located in Golgi apparatus and plasma membrane. Predicted to be active in cytoplasm. Biomarker of pulmonary emphysema. [provided by Alliance of Genome Resources, Apr 2022]

SMPD3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.065761924).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018667.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMPD3	NM_018667.4	MANE Select	c.1280G>A	p.Cys427Tyr	missense	Exon 3 of 9	NP_061137.1	Q9NY59-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SMPD3	ENST00000219334.10	TSL:1 MANE Select	c.1280G>A	p.Cys427Tyr	missense	Exon 3 of 9	ENSP00000219334.5	Q9NY59-1
SMPD3	ENST00000563226.1	TSL:1	c.1280G>A	p.Cys427Tyr	missense	Exon 1 of 7	ENSP00000455955.1	Q9NY59-2
SMPD3	ENST00000568373.5	TSL:1	c.1280G>A	p.Cys427Tyr	missense	Exon 1 of 7	ENSP00000457422.1	H3BS51

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000239

AC:

AN:

250856

AF XY:

0.0000295

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000529

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000109

AC:

AN:

1461782

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

727186

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000989

AC:

AN:

1111956

Other (OTH)

AF:

0.0000166

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000412

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.092

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.46

CADD

Benign

(source)

DANN

Benign

0.38

DEOGEN2

Benign

0.31

Eigen

Benign

-0.91

Eigen_PC

Benign

-0.89

FATHMM_MKL

Benign

0.085

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.051

MetaRNN

Benign

0.066

MetaSVM

Benign

-0.78

MutationAssessor

Benign

-0.20

PhyloP100

0.24

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.32

REVEL

Benign

0.17

Sift

Benign

0.038

Sift4G

Uncertain

0.037

Polyphen

0.24

Vest4

0.14

MutPred

0.51

Loss of helix (P = 0.0068)

MVP

0.11

MPC

0.34

ClinPred

0.039

GERP RS

1.7

PromoterAI

0.022

Neutral

(source)

Varity_R

0.16

gMVP

0.67

Mutation Taster

=99/1

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over