19-55154743-C-G

Position:

chr19-55154743-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_000363.5(TNNI3):c.370G>C(p.Glu124Gln) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,780 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E124K) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

TNNI3
NM_000363.5 missense, splice_region

Scores

Splicing: ADA: 0.006259

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:6

Conservation

PhyloP100: 7.79

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 Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a chain Troponin I, cardiac muscle (size 208) in uniprot entity TNNI3_HUMAN there are 153 pathogenic changes around while only 19 benign (89%) in NM_000363.5

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.989

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TNNI3	NM_000363.5 linkuse as main transcript	c.370G>C	p.Glu124Gln	missense_variant, splice_region_variant	6/8	ENST00000344887.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TNNI3	ENST00000344887.10 linkuse as main transcript	c.370G>C	p.Glu124Gln	missense_variant, splice_region_variant	6/8	1	NM_000363.5	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000802

AC:

AN:

249260

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135286

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000111

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461780

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727202

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ExAC

AF:

0.00000826

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:6

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hypertrophic cardiomyopathy

Pathogenic:1Uncertain:1

Uncertain significance, no assertion criteria provided	research	Agnes Ginges Centre for Molecular Cardiology, Centenary Institute	Apr 07, 2020	The TNNI3 Glu124Gln has been previously identified in a Taiwanese HCM proband, that suffered a resuscitated cardiac arrest, the variant segregated to an affected sibling (Chiou KR, et al., 2015). It has also been identified in 4 HCM probands by Genedx (personal communication) and 1 HCM proband of Asian descent by the Laboratory of Molecular Medicine (personal communication). The variant has been seen as a singleton event in the East Asian sub-population in the Exome Aggregation Consortium dataset (MAF=0.000008; http://exac.broadinstitute.org/). We identified this variant in HCM proband (Burns et al., 2017; Ingles et al., 2017). The proband is of Chinese descent and has a family history of HCM, however segregation was not possible. Computational tools PolyPhen2, PolyPhen-HCM and MutationTaster predict this variant to be deleterious, however SIFT predicts this variant to be "Tolerated". Based on the adapted ACMG guidelines (Kelly MA, et al., 2018) the variant is rare in the general population (PM2) and has been identified in at least 7 HCM probands (PS4_moderate), therefore we classify TNNI3 Glu124Gln as a variant of "uncertain significance" -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 27, 2023	This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 124 of the TNNI3 protein (p.Glu124Gln). This variant is present in population databases (rs727503506, gnomAD 0.01%). This missense change has been observed in individuals with hypertrophic cardiomyopathy (PMID: 25086479, 28498465, 28790153; Invitae). ClinVar contains an entry for this variant (Variation ID: 165520). 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 currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	May 01, 2019	This missense variant replaces glutamic acid with glutamine at codon 124 of the TNNI3 protein. Computational prediction tools and conservation analyses suggest that this variant may have deleterious impact on the protein function. Computational splicing tools suggest that this variant may not impact RNA splicing. To our knowledge, functional assays have not been performed for this variant. This variant has been reported in two siblings affected with hypertrophic cardiomyopathy (PMID: 25086479) and in two unrelated individuals affected with hypertrophic cardiomyopathy (PMID: 28498465, 28790153). This variant has also been identified in 2/249260 chromosomes in the general population by the Genome Aggregation Database (gnomAD). 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	May 17, 2023	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 14, 2013

The Glu124Gln variant in TNNI3 has not been previously reported in individuals w ith cardiomyopathy. Glutamic acid (Glu) at position 124 is highly conserved in m ammals and across most evolutionarily distant species and the change to glutamin e (Gln) was predicted to be pathogenic using a computational tool clinically val idated by our laboratory. This tool's pathogenic prediction is estimated to be c orrect 94% of the time (Jordan 2011). Additional computational analyses (biochem ical amino acid properties, conservation, AlignGVGD, PolyPhen2, and SIFT) do not provide strong support for or against an impact to the protein. Additional info rmation is needed to fully assess the clinical significance of this variant. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 04, 2019

Reported in an adult Chinese male from an HCM cohort who also harbored a nonsense variant in the GLA gene (Zhao et al., 2017); Reported in an Australian proband from an HCM cohort, though patient-specific clinical data were not provided (Burns et al., 2017); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); Reported in ClinVar as a variant of uncertain significance and as a likely pathogenic variant, but additional evidence is not available (ClinVar Variant ID# 165520; Landrum et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 28498465, 25086479, 28790153) -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 16, 2021

The p.E124Q variant (also known as c.370G>C), located in coding exon 6 of the TNNI3 gene, results from a G to C substitution at nucleotide position 370. The glutamic acid at codon 124 is replaced by glutamine, an amino acid with highly similar properties. This alteration has been reported in hypertrophic cardiomyopathy (HCM) cohorts; however, clinical details were limited and an additional alteration in a cardiac-related gene was identified in one case (Chiou KR et al. J Cardiol, 2015 Mar;65:250-6; Burns C et al. Circ Cardiovasc Genet, 2017 Aug;10:[ePub ahead of print]; Ingles J et al. Circ Cardiovasc Genet, 2017 Apr;10:[ePub ahead of print]; Zhao Y et al. Int J Mol Med, 2017 Jul;40:121-129; Mazzarotto F et al. Genet Med, 2019 02;21:284-292). This amino acid position is highly 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

Uncertain

0.43

CardioboostCm

Uncertain

0.79

BayesDel_addAF

Uncertain

0.041

BayesDel_noAF

Uncertain

0.050

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.95

D;D

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.86

D;D

M_CAP

Pathogenic

0.65

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.6

M;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.65

PROVEAN

Uncertain

-2.8

D;.

REVEL

Pathogenic

0.93

Sift

Uncertain

0.0030

D;.

Sift4G

Uncertain

0.032

D;D

Polyphen

0.96

D;.

Vest4

0.83

MutPred

0.87

Gain of MoRF binding (P = 0.03);.;

MVP

0.96

MPC

0.71

ClinPred

0.64

GERP RS

4.4

Varity_R

0.73

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0063

dbscSNV1_RF

Benign

0.084

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