1-201361301-T-G

Variant names:

• chr1-201361301-T-G
• NM_001276345.2:c.788A>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001276345.2(TNNT2):​c.788A>C​(p.Lys263Thr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K263R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TNNT2 NM_001276345.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.04

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]

ENSG00000286600 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 12 uncertain in NM_001276345.2
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNNT2	NM_001276345.2	c.788A>C	p.Lys263Thr	missense_variant	Exon 15 of 17	ENST00000656932.1	NP_001263274.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNNT2	ENST00000656932.1	c.788A>C	p.Lys263Thr	missense_variant	Exon 15 of 17		NM_001276345.2	ENSP00000499593.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
CardioboostCm	Benign	0.032
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.88	.;.;.;.;D;.;.;.;.;.;D
Eigen	Benign	-0.22
Eigen_PC	Benign	-0.097
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.92	.;D;D;D;D;D;D;.;.;D;.
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.69	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.26	T
MutationAssessor	Benign	1.8	.;.;.;.;L;.;.;.;.;.;.
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-3.8	D;D;D;.;D;.;.;.;D;D;D
REVEL	Uncertain	0.35
Sift	Benign	0.049	D;D;D;.;D;.;.;.;D;D;T
Sift4G	Uncertain	0.027	D;D;D;D;D;T;D;T;D;D;.
Polyphen		0.021	.;.;.;.;B;.;.;.;.;.;.
Vest4		0.49
MutPred		0.52		.;.;.;.;Loss of methylation at K263 (P = 0.0037);.;.;.;.;.;.;
MVP		0.92
MPC		0.74
ClinPred		0.84	D
GERP RS		2.6
Varity_R		0.37
gMVP		0.72

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-201330429;