NM_020451.3:c.1405C>T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1PM5PP3_StrongPP5_Very_Strong

The NM_020451.3(SELENON):c.1405C>T(p.Arg469Trp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,613,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R469Q) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

SELENON
NM_020451.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 7.57

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

rigid spine muscular dystrophy 1
Inheritance: AR Classification: DEFINITIVE Submitted by: Ambry Genetics, G2P
SELENON-related myopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
congenital myopathy 4A, autosomal dominant
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
congenital fiber-type disproportion myopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
desmin-related myopathy with Mallory body-like inclusions
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
rigid spine syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SELENON links:

ENSG00000255054 (HGNC:):

ENSG00000255054 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_020451.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-25813899-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 461629.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.946

PP5

Variant 1-25813898-C-T is Pathogenic according to our data. Variant chr1-25813898-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 571063.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SELENON	NM_020451.3 link	c.1405C>T	p.Arg469Trp	missense_variant	Exon 11 of 13	ENST00000361547.7	NP_065184.2	Q9NZV5-1
SELENON	NM_206926.2 link	c.1303C>T	p.Arg435Trp	missense_variant	Exon 10 of 12		NP_996809.1	Q9NZV5-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SELENON	ENST00000361547.7 link	c.1405C>T	p.Arg469Trp	missense_variant	Exon 11 of 13	1	NM_020451.3	ENSP00000355141.2		Q9NZV5-1
ENSG00000255054	ENST00000527604.1 link	n.-75C>T		upstream_gene_variant		5		ENSP00000457066.1		H3BT81

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000802

AC:

AN:

249308

AF XY:

0.0000148

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000884

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000889

AC:

AN:

1461722

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727158

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.0000224

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53362

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000809

AC:

AN:

1111914

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152154

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74326

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41422

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2086

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000248

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Eichsfeld type congenital muscular dystrophy

Pathogenic:3

Aug 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 469 of the SELENON protein (p.Arg469Trp). This variant is present in population databases (rs756927098, gnomAD 0.003%). This missense change has been observed in individual(s) with SELENON-related myopathy (PMID: 19067361; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 571063). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SELENON protein function with a positive predictive value of 95%. This variant disrupts the p.Arg469 amino acid residue in SELENON. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 19067361; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Jan 24, 2023

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:curation

The p.Arg469Trp variant in SELENON has been reported in 3 individuals with SELENON-RM (PMID: 19067361, 31321302, 34602496) and has been identified in 0.003% (1/30592) of South Asian chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs756927098). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. This variant has also been reported in ClinVar (Variation ID#: 571063) and has been interpreted as likely pathogenic by Invitae and GeneDx. Of the 3 affected individuals, 2 of those were homozygotes and 1 was a compound heterozygote that carried a reported pathogenic variant with unknown phase, which increases the likelihood that the p.Arg469Trp variant is pathogenic (VariantID: 4496; PMID: 19067361, 31321302, 34602496). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal recessive SELENON-RM. -

Mar 31, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: SELENON c.1405C>T (p.Arg469Trp) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 249308 control chromosomes. c.1405C>T has been reported in the literature in multiple homozygous or compound heterozygous individuals affected with SELENON-related myopathy or Rigid Spine Muscular Dystrophy (e.g. Maiti_2009, Megarbane_2022, Nicolau_2019, Labcorp (formerly Invitae)). These data indicate that the variant is very likely to be associated with disease. A different variant located at the same codon (c.1406G>A, p.Arg469Gln) has been classified as pathogenic in ClinVar supporting a critical relevance of this residue to SELENON protein function. The following publications have been ascertained in the context of this evaluation (PMID: 19067361, 34602496, 31321302). ClinVar contains an entry for this variant (Variation ID: 571063). Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided

Pathogenic:1

Aug 02, 2023

GeneDx

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at a significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 19067361, 31321302, 34602496) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.41

BayesDel_noAF

Pathogenic

0.45

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.59

.;D;.

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

D;D;D

M_CAP

Uncertain

0.29

MetaRNN

Pathogenic

0.95

D;D;D

MetaSVM

Pathogenic

0.89

MutationAssessor

Benign

2.0

.;M;.

PhyloP100

7.6

PrimateAI

Pathogenic

0.88

PROVEAN

Pathogenic

-5.4

D;D;D

REVEL

Pathogenic

0.93

Sift

Pathogenic

0.0

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

.;D;D

Vest4

0.94

MutPred

0.84

.;Loss of disorder (P = 0.0128);.;

MVP

0.98

MPC

0.88

ClinPred

1.0

GERP RS

5.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.7

Varity_R

0.63

Mutation Taster

=10/90

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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NM_020451.3:c.1405C>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over