1-25808592-G-C

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_020451.3(SELENON):c.550G>C(p.Ala184Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00049 in 1,613,288 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A184T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0026 ( 2 hom., cov: 33)

Exomes 𝑓: 0.00027 ( 0 hom. )

Consequence

SELENON
NM_020451.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts U:1B:5

Conservation

PhyloP100: 2.49

Variant links:

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]

SELENON links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010834575).

BP6

Variant 1-25808592-G-C is Benign according to our data. Variant chr1-25808592-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 297024.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00264 (401/151828) while in subpopulation AFR AF= 0.00904 (374/41394). AF 95% confidence interval is 0.00828. There are 2 homozygotes in gnomad4. There are 185 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SELENON	NM_020451.3 link	c.550G>C	p.Ala184Pro	missense_variant	Exon 5 of 13	ENST00000361547.7	NP_065184.2	Q9NZV5-1
SELENON	NM_206926.2 link	c.448G>C	p.Ala150Pro	missense_variant	Exon 4 of 12		NP_996809.1	Q9NZV5-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SELENON	ENST00000361547.7 link	c.550G>C	p.Ala184Pro	missense_variant	Exon 5 of 13	1	NM_020451.3	ENSP00000355141.2	Q9NZV5-1
SELENON	ENST00000374315.1 link	c.448G>C	p.Ala150Pro	missense_variant	Exon 4 of 12	5		ENSP00000363434.1	Q9NZV5-2
SELENON	ENST00000354177.9 link	c.448G>C	p.Ala150Pro	missense_variant	Exon 4 of 12	5		ENSP00000346109.5	H9KV50
SELENON	ENST00000494537.2 link	n.448G>C		non_coding_transcript_exon_variant	Exon 4 of 13	3		ENSP00000508308.1	A0A804HLD6

Frequencies

GnomAD3 genomes

AF:

0.00261

AC:

396

AN:

151708

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00894

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00157

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:

0.0000295

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000694

AC:

172

AN:

247778

Hom.:

AF XY:

0.000468

AC XY:

AN XY:

134628

show subpopulations

Gnomad AFR exome

AF:

0.00984

Gnomad AMR exome

AF:

0.000377

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000358

Gnomad OTH exome

AF:

0.000331

GnomAD4 exome

AF:

0.000267

AC:

390

AN:

1461460

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

156

AN XY:

727036

show subpopulations

Gnomad4 AFR exome

AF:

0.00938

Gnomad4 AMR exome

AF:

0.000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000630

Gnomad4 OTH exome

AF:

0.000762

GnomAD4 genome

AF:

0.00264

AC:

401

AN:

151828

Hom.:

Cov.:

AF XY:

0.00249

AC XY:

185

AN XY:

74204

show subpopulations

Gnomad4 AFR

AF:

0.00904

Gnomad4 AMR

AF:

0.00157

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000295

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000246

Hom.:

Bravo

AF:

0.00308

ESP6500AA

AF:

0.00754

AC:

ESP6500EA

AF:

0.000119

AC:

ExAC

AF:

0.000819

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Eichsfeld type congenital muscular dystrophy

Uncertain:1Benign:1

May 09, 2018

Biochemical Molecular Genetic Laboratory, King Abdulaziz Medical City

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:2

Aug 26, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

SELENON-related disorder

Benign:1

Apr 14, 2021

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

SEPN1-related disorder

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.037

BayesDel_noAF

Pathogenic

0.29

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.11

.;T;.

Eigen

Benign

0.11

Eigen_PC

Benign

0.092

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.74

T;T;T

MetaRNN

Benign

0.011

T;T;T

MetaSVM

Uncertain

0.22

MutationAssessor

Benign

1.7

.;L;.

PrimateAI

Uncertain

0.51

PROVEAN

Benign

-1.4

N;N;N

REVEL

Pathogenic

0.71

Sift

Benign

0.046

D;D;D

Sift4G

Benign

0.13

T;T;T

Polyphen

0.91, 0.95

.;P;P

Vest4

0.54

MVP

0.94

MPC

0.31

ClinPred

0.036

GERP RS

4.5

Varity_R

0.22

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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