rs3747276

chrX-21967346-C-AchrX-21967346-C-GchrX-21967346-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004595.5(SMS):c.170+30C>A variant causes a intron 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.

• Frequency: Genomes: not found (cov: 21)
• Consequence: SMS NM_004595.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.133

Genes affected

SMS (HGNC:11123): (spermine synthase) This gene encodes a protein belonging to the spermidine/spermin synthase family and catalyzes the production of spermine from spermidine. Pseudogenes of this gene are located on chromosomes 1, 5, 6 and X. Mutations in this gene cause an X-linked intellectual disability called Snyder-Robinson Syndrome (SRS). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2017]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMS	NM_004595.5	c.170+30C>A		intron_variant		ENST00000404933.7
SMS	NM_001258423.2	c.170+30C>A		intron_variant
SMS	XM_005274582.3	c.68+30C>A		intron_variant
SMS	XM_011545568.3	c.68+30C>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMS	ENST00000404933.7	c.170+30C>A		intron_variant		1	NM_004595.5	P1
SMS	ENST00000379404.5	c.170+30C>A		intron_variant		3
SMS	ENST00000457085.2	c.515+30C>A		intron_variant		5
SMS	ENST00000478094.1	n.217+30C>A		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 21

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
Cadd	Benign	0.92
Dann	Benign	0.60

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

LitVar

Other links and lift over

dbSNP: rs3747276; hg19: chrX-21985464;