rs181571822

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_006073.4(TRDN):c.1895G>A(p.Arg632Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000717 in 1,352,796 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00041 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000029 ( 0 hom. )

Consequence

TRDN
NM_006073.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:2

Conservation

PhyloP100: 0.319

Publications

2 publications found

Variant links:

Genes affected

TRDN (HGNC:12261): (triadin) This gene encodes an integral membrane protein found in skeletal and cardiac muscle. The encoded protein plays a role in skeletal muscle excitation-contraction coupling as part of the calcium release complex and is required for normal skeletal muscle strength. This protein indirectly links triads and microtubules in skeletal muscle. Mutations in this gene are associated with cardiac arrythmia syndrome and some variants in this gene may be associated with sudden cardiac death. [provided by RefSeq, May 2022]

TRDN Gene-Disease associations (from GenCC):

catecholaminergic polymorphic ventricular tachycardia
Inheritance: AD, AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
catecholaminergic polymorphic ventricular tachycardia 5
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp
familial long QT syndrome
Inheritance: AR Classification: STRONG Submitted by: G2P
long QT syndrome
Inheritance: AR Classification: STRONG Submitted by: ClinGen

TRDN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0066376626).

BP6

Variant 6-123255878-C-T is Benign according to our data. Variant chr6-123255878-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 426462.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000407 (62/152158) while in subpopulation AFR AF = 0.00123 (51/41530). AF 95% confidence interval is 0.000959. There are 0 homozygotes in GnomAd4. There are 28 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRDN	NM_006073.4 link	c.1895G>A	p.Arg632Lys	missense_variant	Exon 36 of 41	ENST00000334268.9	NP_006064.2	Q13061-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TRDN	ENST00000334268.9 link	c.1895G>A	p.Arg632Lys	missense_variant	Exon 36 of 41	1	NM_006073.4	ENSP00000333984.5		Q13061-1

Frequencies

GnomAD3 genomes

AF:

0.000414

AC:

AN:

152040

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00126

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000721

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000697

AC:

AN:

71720

AF XY:

0.0000251

show subpopulations

Gnomad AFR exome

AF:

0.00139

Gnomad AMR exome

AF:

0.000287

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000292

AC:

AN:

1200638

Hom.:

Cov.:

AF XY:

0.0000254

AC XY:

AN XY:

589612

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00117

AC:

AN:

23164

American (AMR)

AF:

0.000159

AC:

AN:

12594

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

18810

East Asian (EAS)

AF:

0.00

AC:

AN:

27926

South Asian (SAS)

AF:

0.00

AC:

AN:

52174

European-Finnish (FIN)

AF:

0.00

AC:

AN:

43864

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3624

European-Non Finnish (NFE)

AF:

0.00000103

AC:

AN:

969798

Other (OTH)

AF:

0.000103

AC:

AN:

48684

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0000000968998), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.398

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000407

AC:

AN:

152158

Hom.:

Cov.:

AF XY:

0.000376

AC XY:

AN XY:

74400

show subpopulations

African (AFR)

AF:

0.00123

AC:

AN:

41530

American (AMR)

AF:

0.000720

AC:

AN:

15268

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67974

Other (OTH)

AF:

0.00

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.528

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000452

Hom.:

Bravo

AF:

0.000631

ESP6500AA

AF:

0.000896

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000979

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Dec 31, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

Catecholaminergic polymorphic ventricular tachycardia 1

Uncertain:1

Jul 26, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with lysine, which is basic and polar, at codon 632 of the TRDN protein (p.Arg632Lys). This variant is present in population databases (rs181571822, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with TRDN-related conditions. ClinVar contains an entry for this variant (Variation ID: 426462). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The lysine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -

Catecholaminergic polymorphic ventricular tachycardia 5

Uncertain:1

Dec 27, 2019

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TRDN c.1895G>A, p.Arg632Lys variant (rs181571822), to our knowledge, is not reported in the medical literature but is reported in ClinVar (Variation ID: 426462). This variant is found in the African population with an allele frequency of 0.1% (13/11,582 alleles) in the Genome Aggregation Database. The arginine at codon 632 is weakly conserved, and computational analyses (SIFT, PolyPhen-2) predict that this variant is tolerated. However, given the lack of clinical and functional data, the significance of the p.Arg632Lys variant is uncertain at this time. Gene Statement: Pathogenic variants in TRDN are associated with autosomal recessive catecholaminergic polymorphic ventricular tachycardia 5, with or without muscle weakness (MIM: 615441). -

not specified

Benign:1

Mar 07, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

p.Arg632Lys in exon 36 of TRDN: This variant is not expected to have clinical si gnificance due to a lack of conservation across species, including mammals. Of n ote, >30 mammal species have a lysine at this position. In addition, computation al prediction tools suggest it may not impact to the protein. It has also been i dentified in 0.2% (4/1926) of African chromosomes by the Exome Aggregation Conso rtium (ExAC, http://exac.broadinstitute.org; dbSNP rs181571822). -

Cardiovascular phenotype

Benign:1

Jun 07, 2017

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.061

BayesDel_addAF

Benign

-0.71

BayesDel_noAF

Benign

-0.84

CADD

Benign

2.3

(source)

DANN

Benign

0.39

DEOGEN2

Benign

0.065

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.00016

LIST_S2

Benign

0.20

M_CAP

Benign

0.0036

MetaRNN

Benign

0.0066

MetaSVM

Benign

-0.91

MutationAssessor

Benign

-0.55

PhyloP100

0.32

PrimateAI

Benign

0.42

PROVEAN

Benign

0.31

REVEL

Benign

0.011

Sift

Benign

1.0

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.075

MVP

0.030

ClinPred

0.0039

GERP RS

2.1

Varity_R

0.038

gMVP

0.015

Mutation Taster

=97/3

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.15

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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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