chr1-25805118-C-CT

Position:

• chr1-25805118-C-CT

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP6_Moderate BS1 BS2

The NM_020451.3(SELENON):​c.404-23dup variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000824 in 1,612,362 control chromosomes in the GnomAD database, including 10 homozygotes. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.00049 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00086 (9 hom.)
• Consequence: SELENON NM_020451.3 intron
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.111

Genes affected

SELENON (HGNC:15999): (selenoprotein N) This gene encodes a glycoprotein that is localized in the endoplasmic reticulum. It plays an important role in cell protection against oxidative stress, and in the regulation of redox-related calcium homeostasis. Mutations in this gene are associated with early onset muscle disorders, referred to as SEPN1-related myopathy. SEPN1-related myopathy consists of 4 autosomal recessive disorders, originally thought to be separate entities: rigid spine muscular dystrophy (RSMD1), the classical form of multiminicore disease, desmin related myopathy with Mallory-body like inclusions, and congenital fiber-type disproportion (CFTD). This protein is a selenoprotein, containing the rare amino acid selenocysteine (Sec). Sec is encoded by the UGA codon, which normally signals translation termination. The 3' UTRs of selenoprotein mRNAs contain a conserved stem-loop structure, designated the Sec insertion sequence (SECIS) element, that is necessary for the recognition of UGA as a Sec codon, rather than as a stop signal. A second stop-codon redefinition element (SRE) adjacent to the UGA codon has been identified in this gene (PMID:15791204). SRE is a phylogenetically conserved stem-loop structure that stimulates readthrough at the UGA codon, and augments the Sec insertion efficiency by SECIS. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2016]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP6: Variant 1-25805118-C-CT is Benign according to our data. Variant chr1-25805118-C-CT is described in ClinVar as [Likely_benign]. Clinvar id is 261282.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000486 (74/152292) while in subpopulation SAS AF= 0.0147 (71/4826). AF 95% confidence interval is 0.012. There are 1 homozygotes in gnomad4. There are 48 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 9 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SELENON	NM_020451.3	c.404-23dup		intron_variant		ENST00000361547.7	NP_065184.2
SELENON	NM_206926.2	c.302-23dup		intron_variant			NP_996809.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SELENON	ENST00000361547.7	c.404-23dup		intron_variant		1	NM_020451.3	ENSP00000355141
SELENON	ENST00000354177.9	c.302-23dup		intron_variant		5		ENSP00000346109
SELENON	ENST00000374315.1	c.302-23dup		intron_variant		5		ENSP00000363434	P1
SELENON	ENST00000494537.2	c.302-23dup		intron_variant, NMD_transcript_variant		3		ENSP00000508308

Frequencies

GnomAD3 genomes AF: 0.000480 AC: 73 AN: 152174 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.0145

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00180 AC: 448 AN: 248524 Hom.: 2 AF XY: 0.00248 AC XY: 335 AN XY: 134832

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000111

Gnomad SAS exome AF: 0.0144

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000661

GnomAD4 exome AF: 0.000860 AC: 1255 AN: 1460070 Hom.: 9 Cov.: 30 AF XY: 0.00129 AC XY: 938 AN XY: 726284

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0140

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.000680

GnomAD4 genome AF: 0.000486 AC: 74 AN: 152292 Hom.: 1 Cov.: 32 AF XY: 0.000645 AC XY: 48 AN XY: 74468

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.0147

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000642

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

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Computational scores

Source: dbNSFP v4.3

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: rs560595923; hg19: chr1-26131609;