NM_000363.5:c.373-15C>G

Variant names:

• chr19-55154221-G-C
• rs192630178
• NM_000363.5:c.373-15C>G

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_000363.5(TNNI3):​c.373-15C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000237 in 1,609,660 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). The gene TNNI3 is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: 𝑓 0.0012 (2 hom., cov: 31)
  • Exomes 𝑓: 0.00013 (0 hom.)
• Consequence: TNNI3 NM_000363.5 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:11
• Conservation: PhyloP100: 0.150
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• hypertrophic cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• hypertrophic cardiomyopathy 7

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy 2A

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• cardiomyopathy, familial restrictive, 1

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy 1FF

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy

  Inheritance: AR, AD Classification: STRONG Submitted by: ClinGen
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated restrictive cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Specifications for TNNI3 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Benign. The variant received -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BP6: Variant 19-55154221-G-C is Benign according to our data. Variant chr19-55154221-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 43377.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00124 (189/152192) while in subpopulation AFR AF = 0.00431 (179/41530). AF 95% confidence interval is 0.00379. There are 2 homozygotes in GnomAd4. There are 87 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 2 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000363.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TNNI3	NM_000363.5	MANE Select	c.373-15C>G		intron	N/A	NP_000354.4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TNNI3	ENST00000344887.10	TSL:1 MANE Select	c.373-15C>G		intron	N/A	ENSP00000341838.5	P19429
	TNNI3	ENST00000665070.1		c.406-15C>G		intron	N/A	ENSP00000499482.1	A0A590UJN1
	TNNI3	ENST00000714238.1		c.361-15C>G		intron	N/A	ENSP00000519518.1	A0AAQ5BHR0

Frequencies

GnomAD3 genomes AF: 0.00124 AC: 189 AN: 152074 Hom.: 2 Cov.: 31

Gnomad AFR AF: 0.00432

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000459

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: 0.00

Gnomad OTH AF: 0.00143

GnomAD2 exomes AF: 0.000282 AC: 69 AN: 245038 AF XY: 0.000210

Gnomad AFR exome AF: 0.00390

Gnomad AMR exome AF: 0.000232

Gnomad ASJ exome AF: 0.00

Gnomad EAS 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: 0.000132 AC: 192 AN: 1457468 Hom.: 0 Cov.: 32 AF XY: 0.000103 AC XY: 75 AN XY: 725214

African (AFR) AF: 0.00469 AC: 157 AN: 33470

American (AMR) AF: 0.000313 AC: 14 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86226

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49294

Middle Eastern (MID) AF: 0.000174 AC: 1 AN: 5734

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111838

Other (OTH) AF: 0.000315 AC: 19 AN: 60354

GnomAD4 genome AF: 0.00124 AC: 189 AN: 152192 Hom.: 2 Cov.: 31 AF XY: 0.00117 AC XY: 87 AN XY: 74414

African (AFR) AF: 0.00431 AC: 179 AN: 41530

American (AMR) AF: 0.000458 AC: 7 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4816

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10608

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67996

Other (OTH) AF: 0.00142 AC: 3 AN: 2114

Alfa AF: 0.0000869 Hom.: 0

Bravo AF: 0.00137

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	3	not provided (3)
-	-	3	not specified (3)
-	-	2	Hypertrophic cardiomyopathy (2)
-	-	1	Cardiomyopathy (1)
-	-	1	Cardiomyopathy, familial restrictive, 1 (1)
-	1	-	Dilated cardiomyopathy 2A (1)
-	-	1	Familial Hypertrophic Cardiomyopathy with Wolff-Parkinson-White Syndrome (1)
-	1	-	Hypertrophic cardiomyopathy 7 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	3.8
DANN	Benign	0.47
PhyloP100		0.15
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs192630178; hg19: chr19-55665589;