6-123393624-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PP3_Strong

The NM_006073.4(TRDN):c.1105G>A(p.Ala369Thr) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000106 in 1,602,180 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A369V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00011 ( 0 hom. )

Consequence

TRDN
NM_006073.4 missense, splice_region

Scores

Splicing: ADA: 0.9999

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 3.24

Publications

1 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 links:

TRDN-AS1 (HGNC:40592): (TRDN antisense RNA 1)

TRDN-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006073.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TRDN	NM_006073.4	MANE Select	c.1105G>A	p.Ala369Thr	missense splice_region	Exon 13 of 41	NP_006064.2
TRDN	NM_001251987.2		c.1108G>A	p.Ala370Thr	missense splice_region	Exon 13 of 21	NP_001238916.1
TRDN	NM_001407315.1		c.1048G>A	p.Ala350Thr	missense splice_region	Exon 12 of 20	NP_001394244.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TRDN	ENST00000334268.9	TSL:1 MANE Select	c.1105G>A	p.Ala369Thr	missense splice_region	Exon 13 of 41	ENSP00000333984.5
TRDN	ENST00000662930.1		c.1108G>A	p.Ala370Thr	missense splice_region	Exon 13 of 21	ENSP00000499585.1
TRDN-AS1	ENST00000587106.6	TSL:5	n.55+4149C>T		intron	N/A

Frequencies

GnomAD3 genomes

AF:

0.0000658

AC:

AN:

151976

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:

0.000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000300

AC:

AN:

233000

AF XY:

0.0000159

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000105

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000577

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000110

AC:

160

AN:

1450204

Hom.:

Cov.:

AF XY:

0.000103

AC XY:

AN XY:

720378

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33254

American (AMR)

AF:

0.00

AC:

AN:

43542

Ashkenazi Jewish (ASJ)

AF:

0.0000389

AC:

AN:

25716

East Asian (EAS)

AF:

0.00

AC:

AN:

39516

South Asian (SAS)

AF:

0.00

AC:

AN:

84402

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52704

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.000129

AC:

143

AN:

1105524

Other (OTH)

AF:

0.000268

AC:

AN:

59802

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

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:

0.0000658

AC:

AN:

151976

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74224

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41402

American (AMR)

AF:

0.00

AC:

AN:

15244

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000147

AC:

AN:

67956

Other (OTH)

AF:

0.00

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

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:

0.0000993

Hom.:

Bravo

AF:

0.0000529

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000246

AC:

ExAC

AF:

0.0000332

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Mar 25, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); Alters the last nucleotide of the exon and is predicted to destroy the splice donor site but the effect on protein function is unclear; 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; This variant is associated with the following publications: (PMID: 32579932)

Catecholaminergic polymorphic ventricular tachycardia 1

Uncertain:1

Mar 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 369 of the TRDN protein (p.Ala369Thr). This variant also falls at the last nucleotide of exon 13, which is part of the consensus splice site for this exon. This variant is present in population databases (rs369198088, gnomAD 0.01%). 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: 408726). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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.

Cardiovascular phenotype

Uncertain:1

Aug 05, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1105G>A variant (also known as p.A369T), located in coding exon 13 of the TRDN gene, results from a G to A substitution at nucleotide position 1105. The amino acid change results in alanine to threonine at codon 369, an amino acid with similar properties. However, this change occurs in the last base pair of coding exon 13, which makes it likely to have some effect on normal mRNA splicing. This nucleotide position is highly conserved in available vertebrate species. This amino acid position is well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site. In addition, as a missense substitution this is predicted to be tolerated by in silico analysis. However, this alteration does not impact the predominant cardiac isoform of TRDN (NM_001256021.1; Kobayashi YM et al. J. Biol. Chem., 1999 Oct;274:28660-8). Based on the available evidence, the clinical significance of this variant remains unclear.

Catecholaminergic polymorphic ventricular tachycardia 5

Uncertain:1

Apr 23, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TRDN c.1105G>A; p.Ala369Thr variant (rs369198088), to our knowledge, is not reported in the medical literature but is reported in ClinVar (Variation ID: 408726). This variant is found on only eight chromosomes (8/264396 alleles) in the Genome Aggregation Database. The alanine at codon 396 is moderately conserved, and computational analyses predict that this variant is neutral (REVEL: 0.057). However, this variant also occurs in the last nucleotide of exon 13, and computational analyses of splicing (Alamut v.2.11) predict that this variant may impact splicing by weakening the nearby canonical donor splice site, although RNA studies would be required to confirm this. Given the lack of clinical and functional data, the significance of the p.Ala369Thr variant is uncertain at this time.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.093

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.45

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.13

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.35

FATHMM_MKL

Benign

0.64

LIST_S2

Benign

0.54

M_CAP

Benign

0.018

MetaRNN

Benign

0.20

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.81

PhyloP100

3.2

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.12

REVEL

Benign

0.057

Sift

Pathogenic

0.0

Sift4G

Benign

0.53

Polyphen

0.99

Vest4

0.18

MVP

0.30

ClinPred

0.25

GERP RS

5.2

Varity_R

0.18

gMVP

0.012

Mutation Taster

=62/38

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.97

SpliceAI score (max)

0.66

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.66

Position offset: 0

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over