Variant 1-27949087-G-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_014474.4(SMPDL3B):c.298G>C(p.Asp100His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000229 in 1,614,050 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D100N) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

SMPDL3B
NM_014474.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.00700

Variant links:

Genes affected

SMPDL3B (HGNC:21416): (sphingomyelin phosphodiesterase acid like 3B) Enables phosphoric diester hydrolase activity. Predicted to be involved in membrane lipid catabolic process; negative regulation of inflammatory response; and negative regulation of toll-like receptor signaling pathway. Located in extracellular exosome. [provided by Alliance of Genome Resources, Apr 2022]

SMPDL3B links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.24562237).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
SMPDL3B	NM_014474.4 linkuse as main transcript	c.298G>C	p.Asp100His	missense_variant	3/8	ENST00000373894.8
SMPDL3B	NM_001009568.3 linkuse as main transcript	c.298G>C	p.Asp100His	missense_variant	3/7
SMPDL3B	XM_011541259.3 linkuse as main transcript	c.388G>C	p.Asp130His	missense_variant	4/9
SMPDL3B	NM_001304579.2 linkuse as main transcript	c.-321G>C		5_prime_UTR_variant	3/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMPDL3B	ENST00000373894.8 linkuse as main transcript	c.298G>C	p.Asp100His	missense_variant	3/8	1	NM_014474.4	P1	Q92485-1
	ENST00000448015.1 linkuse as main transcript	n.286+6684C>G		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000386

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251438

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135894

show subpopulations

Gnomad AFR exome

AF:

0.000369

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1461870

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.000538

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000112

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74344

show subpopulations

Gnomad4 AFR

AF:

0.000386

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000155

ExAC

AF:

0.0000576

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 14, 2021

The c.298G>C (p.D100H) alteration is located in exon 3 (coding exon 3) of the SMPDL3B gene. This alteration results from a G to C substitution at nucleotide position 298, causing the aspartic acid (D) at amino acid position 100 to be replaced by a histidine (H). 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

0.57

BayesDel_addAF

Benign

-0.25

BayesDel_noAF

Benign

-0.26

CADD

Benign

DANN

Benign

0.97

DEOGEN2

Benign

0.37

T;D;.;T

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.90

FATHMM_MKL

Benign

0.15

LIST_S2

Uncertain

0.90

D;D;D;D

M_CAP

Benign

0.064

MetaRNN

Benign

0.25

T;T;T;T

MetaSVM

Uncertain

-0.076

MutationAssessor

Uncertain

2.4

M;.;M;.

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Benign

0.24

PROVEAN

Uncertain

-2.5

N;D;N;N

REVEL

Uncertain

0.40

Sift

Benign

0.19

T;T;T;T

Sift4G

Benign

0.14

T;T;T;T

Polyphen

1.0

D;.;D;D

Vest4

0.40

MutPred

0.51

Loss of solvent accessibility (P = 0.0703);.;Loss of solvent accessibility (P = 0.0703);Loss of solvent accessibility (P = 0.0703);

MVP

0.88

MPC

0.94

ClinPred

0.18

GERP RS

-4.7

Varity_R

0.14

gMVP

0.80

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.19

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