chr19-55154097-G-A

Variant names:

Variant summary

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

The NM_000363.5(TNNI3):c.482C>T(p.Ala161Val) variant causes a missense change. The variant allele was found at a frequency of 0.000013 in 1,612,668 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

TNNI3
NM_000363.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 6.63

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM1

In a helix (size 2) in uniprot entity TNNI3_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_000363.5

BP4

Computational evidence support a benign effect (MetaRNN=0.36844188).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNNI3	NM_000363.5 link	c.482C>T	p.Ala161Val	missense_variant	Exon 7 of 8	ENST00000344887.10	NP_000354.4	P19429Q6FGX2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNNI3	ENST00000344887.10 link	c.482C>T	p.Ala161Val	missense_variant	Exon 7 of 8	1	NM_000363.5	ENSP00000341838.5		P19429

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151752

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000804

AC:

AN:

248904

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135140

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1460916

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

726788

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000171

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151752

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74056

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Uncertain:2

Dec 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 161 of the TNNI3 protein (p.Ala161Val). This variant is present in population databases (rs753413305, gnomAD 0.002%). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 33495597). ClinVar contains an entry for this variant (Variation ID: 454406). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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. -

Dec 13, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces alanine with valine at codon 161 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 been reported in at least one individual affected with hypertrophic cardiomyopathy (PMID: 33495597). This variant has been identified in 2/248904 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. -

not specified

Uncertain:1

Nov 10, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiomyopathy

Uncertain:1

Apr 25, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

not provided

Uncertain:1

Feb 22, 2016

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: provider interpretation

We have seen the TNNI3 Ala161Val variant in one person with HCM. Testing was done at GeneDx. Given a lack of case data we consider this variant of unknown significance and we do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). The variant is novel. In silico analysis with Mutation Taster predicts the variant to be a polymorphism. The alanine at codon 161 is not well conserved; it is conserved in primates, but is not conserved or does not have a homologue in several other species. There are 2 of 60,108 individuals with variation at codon 161 listed in the Exome Aggregation Consortium dataset (http://exac.broadinstitute.org/), which currently includes variant calls on ~64,000 individuals of European, African, Latino and Asian descent (as of Feb. 22, 2016). Specifically, there are 2 of 33,175 non-Finnish European individuals. -

Cardiovascular phenotype

Uncertain:1

Mar 28, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.A161V variant (also known as c.482C>T), located in coding exon 7 of the TNNI3 gene, results from a C to T substitution at nucleotide position 482. The alanine at codon 161 is replaced by valine, an amino acid with similar properties. This variant was reported in a hypertrophic cardiomyopathy (HCM) cohort; however, clinical details were limited (Harper AR et al. Nat Genet, 2021 02;53:135-142). This amino acid position is poorly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

CardioboostCm

Benign

0.040

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.030

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.90

D;D

Eigen

Benign

-0.11

Eigen_PC

Benign

0.037

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.97

D;D

M_CAP

Benign

0.062

MetaRNN

Benign

0.37

T;T

MetaSVM

Uncertain

0.069

MutationAssessor

Benign

1.2

L;.

PrimateAI

Benign

0.42

PROVEAN

Uncertain

-2.5

N;.

REVEL

Uncertain

0.36

Sift

Uncertain

0.029

D;.

Sift4G

Uncertain

0.013

D;D

Polyphen

0.0020

B;.

Vest4

0.17

MVP

0.90

MPC

0.70

ClinPred

0.87

GERP RS

3.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.25

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