2-130152714-G-C

Variant names:

• chr2-130152714-G-C
• rs529527017
• NM_017951.5:c.2325C>G

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_017951.5(SMPD4):​c.2325C>G​(p.Gly775Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000699 in 1,429,800 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G775G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: SMPD4 NM_017951.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.57
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (REVEL=0.038).
• BP7: Synonymous conserved (PhyloP=1.58 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMPD4	NM_017951.5	c.2325C>G	p.Gly775Gly	synonymous_variant	Exon 20 of 20	ENST00000680298.1	NP_060421.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMPD4	ENST00000680298.1	c.2325C>G	p.Gly775Gly	synonymous_variant	Exon 20 of 20		NM_017951.5	ENSP00000506463.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.99e-7 AC: 1 AN: 1429800 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 708482

African (AFR) AF: 0.00 AC: 0 AN: 32802

American (AMR) AF: 0.00 AC: 0 AN: 39296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25496

East Asian (EAS) AF: 0.00 AC: 0 AN: 38022

South Asian (SAS) AF: 0.00 AC: 0 AN: 82646

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50174

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4880

European-Non Finnish (NFE) AF: 9.11e-7 AC: 1 AN: 1097354

Other (OTH) AF: 0.00 AC: 0 AN: 59130

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
CADD	Benign	5.7
DANN	Benign	0.69
PhyloP100		1.6
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs529527017; hg19: chr2-130910287;