rs10521911

chrX-21983681-G-AchrX-21983681-G-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_004595.5(SMS):c.751-623G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.209 in 110,107 control chromosomes in the GnomAD database, including 2,145 homozygotes. There are 6,405 hemizygotes in GnomAD. 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: 𝑓 0.21 (2145 hom., 6405 hem., cov: 22)
• Consequence: SMS NM_004595.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.37

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 Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.97).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.342 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMS	NM_004595.5	c.751-623G>A		intron_variant		ENST00000404933.7
SMS	NM_001258423.2	c.592-623G>A		intron_variant
SMS	XM_005274582.3	c.649-623G>A		intron_variant
SMS	XM_011545568.3	c.649-623G>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMS	ENST00000404933.7	c.751-623G>A		intron_variant		1	NM_004595.5	P1
SMS	ENST00000379404.5	c.592-623G>A		intron_variant		3

Frequencies

GnomAD3 genomes AF: 0.209 AC: 22997 AN: 110053 Hom.: 2142 Cov.: 22 AF XY: 0.197 AC XY: 6372 AN XY: 32371

Gnomad AFR AF: 0.347

Gnomad AMI AF: 0.177

Gnomad AMR AF: 0.132

Gnomad ASJ AF: 0.149

Gnomad EAS AF: 0.145

Gnomad SAS AF: 0.0602

Gnomad FIN AF: 0.162

Gnomad MID AF: 0.153

Gnomad NFE AF: 0.167

Gnomad OTH AF: 0.182

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.209 AC: 23033 AN: 110107 Hom.: 2145 Cov.: 22 AF XY: 0.197 AC XY: 6405 AN XY: 32435

Gnomad4 AFR AF: 0.347

Gnomad4 AMR AF: 0.131

Gnomad4 ASJ AF: 0.149

Gnomad4 EAS AF: 0.145

Gnomad4 SAS AF: 0.0596

Gnomad4 FIN AF: 0.162

Gnomad4 NFE AF: 0.167

Gnomad4 OTH AF: 0.179

Alfa AF: 0.188 Hom.: 2909

Bravo AF: 0.218

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
Cadd	Benign	0.12
Dann	Benign	0.38

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: rs10521911; hg19: chrX-22001799;