NM_000363.5:c.233C>T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM1BP4

The NM_000363.5(TNNI3):c.233C>T(p.Thr78Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000685 in 1,460,100 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

TNNI3
NM_000363.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.418

Variant links:

Genes affected

TNNI3 (HGNC:11947): (troponin I3, cardiac type) Troponin I (TnI), along with troponin T (TnT) and troponin C (TnC), is one of 3 subunits that form the troponin complex of the thin filaments of striated muscle. TnI is the inhibitory subunit; blocking actin-myosin interactions and thereby mediating striated muscle relaxation. The TnI subfamily contains three genes: TnI-skeletal-fast-twitch, TnI-skeletal-slow-twitch, and TnI-cardiac. This gene encodes the TnI-cardiac protein and is exclusively expressed in cardiac muscle tissues. Mutations in this gene cause familial hypertrophic cardiomyopathy type 7 (CMH7) and familial restrictive cardiomyopathy (RCM). Troponin I is useful in making a diagnosis of heart failure, and of ischemic heart disease. An elevated level of troponin is also now used as indicator of acute myocardial injury in patients hospitalized with moderate/severe Coronavirus Disease 2019 (COVID-19). Such elevation has also been associated with higher risk of mortality in cardiovascular disease patients hospitalized due to COVID-19. [provided by RefSeq, Aug 2020]

TNNI3 links:

ENSG00000267110 (HGNC:):

ENSG00000267110 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM1

In a chain Troponin I, cardiac muscle (size 208) in uniprot entity TNNI3_HUMAN there are 86 pathogenic changes around while only 10 benign (90%) in NM_000363.5

BP4

Computational evidence support a benign effect (MetaRNN=0.28996202).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNNI3	NM_000363.5 link	c.233C>T	p.Thr78Ile	missense_variant	Exon 5 of 8	ENST00000344887.10	NP_000354.4	P19429Q6FGX2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TNNI3	ENST00000344887.10 link	c.233C>T	p.Thr78Ile	missense_variant	Exon 5 of 8	1	NM_000363.5	ENSP00000341838.5	P19429
ENSG00000267110	ENST00000587871.1 link	n.*335C>T		non_coding_transcript_exon_variant	Exon 8 of 9	5		ENSP00000473050.1	M0R381
ENSG00000267110	ENST00000587871.1 link	n.*335C>T		3_prime_UTR_variant	Exon 8 of 9	5		ENSP00000473050.1	M0R381

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000831

AC:

AN:

240612

Hom.:

AF XY:

0.00000755

AC XY:

AN XY:

132490

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000659

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000685

AC:

AN:

1460100

Hom.:

Cov.:

AF XY:

0.00000826

AC XY:

AN XY:

726426

show subpopulations

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:

0.0000928

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000468

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 09, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Thr78Ile variant in TNNI3 has not been previously reported in individuals with cardiomyopathy. Data from large population studies is insufficient to asses s the frequency of this variant. Computational prediction tools and conservation analysis do not provide strong support for or against an impact to the protein. In summary, the clinical significance of the p.Thr78Ile variant is uncertain. -

Cardiomyopathy

Uncertain:1

Mar 28, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces threonine with isoleucine at codon 78 of the TNNI3 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with TNNI3-related disorders in the literature. This variant has been identified in 2/240612 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

CardioboostCm

Benign

0.038

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.22

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.79

D;D

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.23

FATHMM_MKL

Benign

0.20

LIST_S2

Benign

0.85

D;D

M_CAP

Uncertain

0.22

MetaRNN

Benign

0.29

T;T

MetaSVM

Uncertain

0.028

MutationAssessor

Benign

0.0

N;.

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-1.9

N;.

REVEL

Benign

0.25

Sift

Uncertain

0.0030

D;.

Sift4G

Uncertain

0.0020

D;D

Polyphen

0.40

B;.

Vest4

0.32

MutPred

0.41

Gain of catalytic residue at L83 (P = 0.0224);.;

MVP

0.89

MPC

0.78

ClinPred

0.33

GERP RS

3.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.65

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over