6-123393624-C-A

Position:

• chr6-123393624-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_006073.4(TRDN):​c.1105G>T​(p.Ala369Ser) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,450,204 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 (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TRDN NM_006073.4 missense, splice_region
• Scores: Splicing: ADA: 0.9997
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.24

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

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TRDN	NM_006073.4	c.1105G>T	p.Ala369Ser	missense_variant, splice_region_variant	13/41	ENST00000334268.9	NP_006064.2
TRDN	NM_001251987.2	c.1108G>T	p.Ala370Ser	missense_variant, splice_region_variant	13/21		NP_001238916.1
TRDN	NM_001407315.1	c.1048G>T	p.Ala350Ser	missense_variant, splice_region_variant	12/20		NP_001394244.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TRDN	ENST00000334268.9	c.1105G>T	p.Ala369Ser	missense_variant, splice_region_variant	13/41	1	NM_006073.4	ENSP00000333984	A2
TRDN-AS1	ENST00000587106.6	n.55+4149C>A		intron_variant, non_coding_transcript_variant		5
TRDN	ENST00000662930.1	c.1108G>T	p.Ala370Ser	missense_variant, splice_region_variant	13/21			ENSP00000499585

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1450204 Hom.: 0 Cov.: 30 AF XY: 0.00000139 AC XY: 1 AN XY: 720378

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.05e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Catecholaminergic polymorphic ventricular tachycardia 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 17, 2021

This sequence change replaces alanine with serine at codon 369 of the TRDN protein (p.Ala369Ser). The alanine residue is moderately conserved and there is a moderate physicochemical difference between alanine and serine. This variant also falls at the last nucleotide of exon 13, which is part of the consensus splice site for this exon. 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. 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. 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: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with TRDN-related conditions. This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	T
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.50	T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.24	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.81	L
MutationTaster	Benign	0.99	D;D
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.070	N
REVEL	Benign	0.055
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.65	T
Polyphen		1.0	D
Vest4		0.17
MutPred		0.27		Gain of phosphorylation at A369 (P = 0.0092);
MVP		0.28
ClinPred		0.81	D
GERP RS		5.2
Varity_R		0.18
gMVP		0.011

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
SpliceAI score (max)		0.79		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.79		Position offset: 0

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-123714769;