rs1554219406

Positions:

• chr6-123272969-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_006073.4(TRDN):​c.1667A>G​(p.Lys556Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TRDN NM_006073.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1 O:1
• Conservation: PhyloP100: 4.04

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRDN	NM_006073.4	c.1667A>G	p.Lys556Arg	missense_variant	29/41	ENST00000334268.9	NP_006064.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRDN	ENST00000334268.9	c.1667A>G	p.Lys556Arg	missense_variant	29/41	1	NM_006073.4	ENSP00000333984.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Catecholaminergic polymorphic ventricular tachycardia 1 Uncertain:1 Other:1

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 08, 2017	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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with TRDN-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces lysine with arginine at codon 556 of the TRDN protein (p.Lys556Arg). The lysine residue is weakly conserved and there is a small physicochemical difference between lysine and arginine. -
not provided, no classification provided	phenotyping only	GenomeConnect - Invitae Patient Insights Network	-	Variant classified as Uncertain significance and reported on 11-17-2017 by Invitae. GenomeConnect-Invitae Patient Insights Network assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. Registry team members make no attempt to reinterpret the clinical significance of the variant. Phenotypic details are available under supporting information. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.13	T
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Benign	0.53	T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.97	L
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-0.56	N
REVEL	Benign	0.054
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.45	T
Polyphen		0.99	D
Vest4		0.23
MutPred		0.27		Loss of ubiquitination at K556 (P = 0.0233);
MVP		0.16
ClinPred		0.90	D
GERP RS		5.0
Varity_R		0.22
gMVP		0.021

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.38		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.38		Position offset: -5

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

Publications

LitVar

Other links and lift over

dbSNP: rs1554219406; hg19: chr6-123594114;