Genetic Variant SMPD4:p.Thr819Thr (chr2-130152582-G-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_017951.5(SMPD4):c.2457C>A(p.Thr819Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T819T) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SMPD4
NM_017951.5 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -4.95

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: G2P, Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)

SMPD4 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (REVEL=0.004).

BP7

Synonymous conserved (PhyloP=-4.95 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017951.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SMPD4	NM_017951.5	MANE Select	c.2457C>A	p.Thr819Thr	synonymous	Exon 20 of 20	NP_060421.3	A0A7P0TB24
SMPD4	NM_017751.4		c.2487C>A	p.Thr829Thr	synonymous	Exon 19 of 19	NP_060221.2	Q9NXE4-2
SMPD4	NM_001171083.2		c.2268C>A	p.Thr756Thr	synonymous	Exon 17 of 17	NP_001164554.1	Q9NXE4-6

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SMPD4	ENST00000680298.1	MANE Select	c.2457C>A	p.Thr819Thr	synonymous	Exon 20 of 20	ENSP00000506463.1	A0A7P0TB24
SMPD4	ENST00000409031.5	TSL:1	c.2574C>A	p.Thr858Thr	synonymous	Exon 20 of 20	ENSP00000386531.1	Q9NXE4-1
SMPD4	ENST00000454468.5	TSL:1	n.*2161C>A		non_coding_transcript_exon	Exon 19 of 19	ENSP00000407591.1	F8WF03

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

1396604

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

688676

African (AFR)

AF:

0.00

AC:

AN:

31548

American (AMR)

AF:

0.00

AC:

AN:

35692

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25168

East Asian (EAS)

AF:

0.00

AC:

AN:

35764

South Asian (SAS)

AF:

0.00

AC:

AN:

79178

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48698

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4646

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1078048

Other (OTH)

AF:

0.00

AC:

AN:

57862

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.89

CADD

Benign

0.0020

(source)

DANN

Benign

0.36

PhyloP100

-5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over