1-201364468-TG-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP6_Very_StrongBS1BS2

The NM_001276345.2(TNNT2):c.412-94delC variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00946 in 1,303,710 control chromosomes in the GnomAD database, including 95 homozygotes. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0083 ( 9 hom., cov: 33)

Exomes 𝑓: 0.0096 ( 86 hom. )

Consequence

TNNT2
NM_001276345.2 intron

Scores

Not classified

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -0.134

Publications

0 publications found

Variant links:

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]

TNNT2 Gene-Disease associations (from GenCC):

dilated cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
dilated cardiomyopathy 1D
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
hypertrophic cardiomyopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
hypertrophic cardiomyopathy 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
hypertrophic cardiomyopathy 3
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
cardiomyopathy, familial restrictive, 3
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
familial isolated restrictive cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
left ventricular noncompaction
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
cardiomyopathy
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics
arrhythmogenic right ventricular cardiomyopathy
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

TNNT2 links:

ENSG00000286600 (HGNC:):

ENSG00000286600 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -16 ACMG points.

BP6

Variant 1-201364468-TG-T is Benign according to our data. Variant chr1-201364468-TG-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 496075.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00827 (1260/152336) while in subpopulation NFE AF = 0.012 (818/68024). AF 95% confidence interval is 0.0113. There are 9 homozygotes in GnomAd4. There are 636 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 9 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TNNT2	NM_001276345.2 link	c.412-94delC		intron_variant	Intron 10 of 16	ENST00000656932.1	NP_001263274.1	P45379-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TNNT2	ENST00000656932.1 link	c.412-94delC		intron_variant	Intron 10 of 16		NM_001276345.2	ENSP00000499593.1		P45379-1

Frequencies

GnomAD3 genomes

AF:

0.00828

AC:

1260

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00215

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00275

Gnomad ASJ

AF:

0.00346

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0276

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.0120

Gnomad OTH

AF:

0.00239

GnomAD4 exome

AF:

0.00962

AC:

11079

AN:

1151374

Hom.:

AF XY:

0.00925

AC XY:

5374

AN XY:

581196

show subpopulations

African (AFR)

AF:

0.00139

AC:

AN:

27242

American (AMR)

AF:

0.00199

AC:

AN:

37254

Ashkenazi Jewish (ASJ)

AF:

0.00401

AC:

AN:

23714

East Asian (EAS)

AF:

0.00

AC:

AN:

35660

South Asian (SAS)

AF:

0.0000132

AC:

AN:

75650

European-Finnish (FIN)

AF:

0.0255

AC:

931

AN:

36452

Middle Eastern (MID)

AF:

0.00305

AC:

AN:

5244

European-Non Finnish (NFE)

AF:

0.0112

AC:

9592

AN:

860082

Other (OTH)

AF:

0.00663

AC:

332

AN:

50076

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

565

1130

1694

2259

2824

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

308

616

924

1232

1540

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00827

AC:

1260

AN:

152336

Hom.:

Cov.:

AF XY:

0.00854

AC XY:

636

AN XY:

74496

show subpopulations

African (AFR)

AF:

0.00214

AC:

AN:

41592

American (AMR)

AF:

0.00274

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00346

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5172

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.0276

AC:

293

AN:

10628

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0120

AC:

818

AN:

68024

Other (OTH)

AF:

0.00237

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

131

196

262

327

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0114

Hom.:

Bravo

AF:

0.00661

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Jun 19, 2018

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Jul 10, 2017

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

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: The TNNT2 c.382-94delC variant involves the alteration of a non-conserved intronic nucleotide. One in silico tool predicts a benign outcome for this variant. 5/5 splice prediction tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. This variant was found in 337/30938 control chromosomes at a frequency of 0.0108928, which is approximately 44 times the estimated maximal expected allele frequency of a pathogenic TNNT2 variant (0.00025), suggesting this variant is likely a benign polymorphism. This variant was reported in HCM patients without strong evidence for causality (Erdmann_CG_2003, Jaaskelainen_AM_2004). The variant of interest has not, to our knowledge, been reported by reputable databases/clinical diagnostic laboratories; nor evaluated for functional impact by in vivo/vitro studies. Due to the high frequency of this variant in the general population, the lack of impact on protein structure, and the lack of predicted impact on splicing, this variant has been classified as benign. -

Dilated cardiomyopathy 1D

Benign:1

Apr 11, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Cardiomyopathy, familial restrictive, 3

Benign:1

Apr 11, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Hypertrophic cardiomyopathy 2

Benign:1

Apr 11, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.13

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over