1-25800234-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP4

The NM_020451.3(SELENON):c.4G>T(p.Gly2Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000351 in 812,036 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00025 ( 0 hom., cov: 30)

Exomes 𝑓: 0.00037 ( 0 hom. )

Consequence

SELENON
NM_020451.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: -0.219

Publications

0 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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.406279).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SELENON	NM_020451.3 link	c.4G>T	p.Gly2Cys	missense_variant	Exon 1 of 13	ENST00000361547.7	NP_065184.2	Q9NZV5-1
SELENON	NM_206926.2 link	c.4G>T	p.Gly2Cys	missense_variant	Exon 1 of 12		NP_996809.1	Q9NZV5-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SELENON	ENST00000361547.7 link	c.4G>T	p.Gly2Cys	missense_variant	Exon 1 of 13	1	NM_020451.3	ENSP00000355141.2	Q9NZV5-1
SELENON	ENST00000374315.1 link	c.4G>T	p.Gly2Cys	missense_variant	Exon 1 of 12	5		ENSP00000363434.1	Q9NZV5-2
SELENON	ENST00000354177.9 link	c.4G>T	p.Gly2Cys	missense_variant	Exon 1 of 12	5		ENSP00000346109.5	H9KV50
SELENON	ENST00000494537.2 link	n.4G>T		non_coding_transcript_exon_variant	Exon 1 of 13	3		ENSP00000508308.1	A0A804HLD6

Frequencies

GnomAD3 genomes

AF:

0.000247

AC:

AN:

145810

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000737

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:

0.000122

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000487

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000374

AC:

249

AN:

666226

Hom.:

Cov.:

AF XY:

0.000361

AC XY:

112

AN XY:

309946

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

12522

American (AMR)

AF:

0.00

AC:

AN:

778

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

4132

East Asian (EAS)

AF:

0.00

AC:

AN:

2856

South Asian (SAS)

AF:

0.00

AC:

AN:

13774

European-Finnish (FIN)

AF:

0.00

AC:

AN:

222

Middle Eastern (MID)

AF:

0.00

AC:

AN:

1314

European-Non Finnish (NFE)

AF:

0.000401

AC:

244

AN:

608860

Other (OTH)

AF:

0.000230

AC:

AN:

21768

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000247

AC:

AN:

145810

Hom.:

Cov.:

AF XY:

0.000212

AC XY:

AN XY:

70896

show subpopulations

African (AFR)

AF:

0.0000737

AC:

AN:

40718

American (AMR)

AF:

0.00

AC:

AN:

14708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3384

East Asian (EAS)

AF:

0.00

AC:

AN:

5094

South Asian (SAS)

AF:

0.00

AC:

AN:

4784

European-Finnish (FIN)

AF:

0.000122

AC:

AN:

8228

Middle Eastern (MID)

AF:

0.00

AC:

AN:

310

European-Non Finnish (NFE)

AF:

0.000487

AC:

AN:

65660

Other (OTH)

AF:

0.00

AC:

AN:

2012

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000162

Hom.:

Bravo

AF:

0.000268

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Eichsfeld type congenital muscular dystrophy

Uncertain:2

Sep 26, 2022

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 18, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with cysteine, which is neutral and slightly polar, at codon 2 of the SELENON protein (p.Gly2Cys). This variant is present in population databases (no rsID available, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with SELENON-related conditions. ClinVar contains an entry for this variant (Variation ID: 426515). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SELENON protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Inborn genetic diseases

Uncertain:1

Apr 13, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.4G>T (p.G2C) alteration is located in exon 1 (coding exon 1) of the SEPN1 gene. This alteration results from a G to T substitution at nucleotide position 4, causing the glycine (G) at amino acid position 2 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Oct 01, 2020

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Eichsfeld type congenital muscular dystrophy;C0546264:Congenital myopathy with fiber type disproportion

Uncertain:1

Oct 08, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.035

BayesDel_noAF

Benign

-0.19

CADD

Benign

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.10

.;T;.

Eigen

Benign

-0.26

Eigen_PC

Benign

-0.34

FATHMM_MKL

Benign

0.13

LIST_S2

Benign

0.29

T;T;T

M_CAP

Pathogenic

0.87

MetaRNN

Benign

0.41

T;T;T

MetaSVM

Benign

-0.38

MutationAssessor

Benign

0.69

.;N;N

PhyloP100

-0.22

PrimateAI

Uncertain

0.69

PROVEAN

Benign

-1.3

N;N;N

REVEL

Uncertain

0.30

Sift

Pathogenic

0.0

D;D;D

Sift4G

Benign

0.12

T;T;T

Polyphen

0.99, 1.0

.;D;D

Vest4

0.11

MutPred

0.30

Gain of catalytic residue at G2 (P = 0.0295);Gain of catalytic residue at G2 (P = 0.0295);Gain of catalytic residue at G2 (P = 0.0295);

MVP

0.89

MPC

0.25

ClinPred

0.42

GERP RS

2.0

PromoterAI

-0.0090

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.27

Mutation Taster

=85/15

polymorphism

(source)

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

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1-25800234-G-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over