rs397516473

Positions:

• chr1-201363336-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_001276345.2(TNNT2):​c.560C>A​(p.Ala187Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TNNT2 NM_001276345.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.40

Genes affected

TNNT2 (HGNC:11949): (troponin T2, cardiac type) This gene encodes the cardiac isoform of troponin T. The encoded protein is the tropomyosin-binding subunit of the troponin complex, which is located on the thin filament of striated muscles and regulates muscle contraction in response to alterations in intracellular calcium ion concentration. Mutations in this gene have been associated with familial hypertrophic cardiomyopathy as well as with dilated cardiomyopathy. [provided by RefSeq, May 2022]

TNNT2 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 10 uncertain in NM_001276345.2
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.853

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TNNT2	NM_001276345.2	c.560C>A	p.Ala187Asp	missense_variant	12/17	ENST00000656932.1	NP_001263274.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TNNT2	ENST00000656932.1	c.560C>A	p.Ala187Asp	missense_variant	12/17		NM_001276345.2	ENSP00000499593.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jun 01, 2012

The Ala177Asp variant in TNNT2 has not been reported in the literature and has n ot been identified in >3600 individuals (>2200 Caucasian) tested by our laborato ry. Computational analyses (biochemical amino acid properties, conservation, Ali gnGVGD, PolyPhen2, and SIFT) do not provide strong support for or against an imp act to the protein. Additional information is needed to fully assess the clinica l significance of the Ala177Asp variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
CardioboostCm	Uncertain	0.41
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	.;.;.;.;D;.;.;.;.;.;D
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	.;D;D;D;D;D;D;.;.;D;.
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.85	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Uncertain	2.4	.;.;.;.;M;.;.;.;.;.;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-4.5	D;D;D;.;.;.;.;.;D;D;D
REVEL	Pathogenic	0.78
Sift	Pathogenic	0.0	D;D;D;.;.;.;.;.;D;D;D
Sift4G	Benign	0.091	T;T;T;T;D;T;T;T;T;T;.
Polyphen		0.99, 0.99	.;.;.;.;D;.;.;.;.;.;D
Vest4		0.84
MutPred		0.41		.;.;.;.;Gain of ubiquitination at K186 (P = 0.0359);.;.;.;.;.;.;
MVP		0.99
MPC		1.7
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.52
gMVP		0.90

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

LitVar

Other links and lift over

dbSNP: rs397516473; hg19: chr1-201332464;