2-178658746-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_001267550.2(TTN):c.37502C>T(p.Pro12501Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 12/15 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P12501P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000098 ( 0 hom., cov: 19)

Exomes 𝑓: 0.000027 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

TTN
NM_001267550.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.0580

Publications

0 publications found

Variant links:

Genes affected

TTN (HGNC:12403): (titin) This gene encodes a large abundant protein of striated muscle. The product of this gene is divided into two regions, a N-terminal I-band and a C-terminal A-band. The I-band, which is the elastic part of the molecule, contains two regions of tandem immunoglobulin domains on either side of a PEVK region that is rich in proline, glutamate, valine and lysine. The A-band, which is thought to act as a protein-ruler, contains a mixture of immunoglobulin and fibronectin repeats, and possesses kinase activity. An N-terminal Z-disc region and a C-terminal M-line region bind to the Z-line and M-line of the sarcomere, respectively, so that a single titin molecule spans half the length of a sarcomere. Titin also contains binding sites for muscle associated proteins so it serves as an adhesion template for the assembly of contractile machinery in muscle cells. It has also been identified as a structural protein for chromosomes. Alternative splicing of this gene results in multiple transcript variants. Considerable variability exists in the I-band, the M-line and the Z-disc regions of titin. Variability in the I-band region contributes to the differences in elasticity of different titin isoforms and, therefore, to the differences in elasticity of different muscle types. Mutations in this gene are associated with familial hypertrophic cardiomyopathy 9, and autoantibodies to titin are produced in patients with the autoimmune disease scleroderma. [provided by RefSeq, Feb 2012]

TTN links:

TTN-AS1 (HGNC:44124): (TTN antisense RNA 1) This gene encodes a non-coding RNA transcribed from the opposite strand to the titin gene. [provided by RefSeq, Aug 2016]

TTN-AS1 links:

LOC124906100 (HGNC:):

LOC124906100 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.10177502).

BP6

Variant 2-178658746-G-A is Benign according to our data. Variant chr2-178658746-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 467082.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTN	NM_001267550.2 link	c.37502C>T	p.Pro12501Leu	missense_variant	Exon 183 of 363	ENST00000589042.5	NP_001254479.2	A0A0A0MTS7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTN	ENST00000589042.5 link	c.37502C>T	p.Pro12501Leu	missense_variant	Exon 183 of 363	5	NM_001267550.2	ENSP00000467141.1		A0A0A0MTS7

Frequencies

GnomAD3 genomes

AF:

0.0000981

AC:

AN:

142780

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000180

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000143

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000413

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000464

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000635

AC:

AN:

78796

AF XY:

0.0000260

show subpopulations

Gnomad AFR exome

AF:

0.000315

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000119

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000646

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000265

AC:

AN:

1433748

Hom.:

Cov.:

AF XY:

0.0000182

AC XY:

AN XY:

714016

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000606

AC:

AN:

33016

American (AMR)

AF:

0.0000451

AC:

AN:

44316

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25778

East Asian (EAS)

AF:

0.000127

AC:

AN:

39512

South Asian (SAS)

AF:

0.0000352

AC:

AN:

85266

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53040

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4086

European-Non Finnish (NFE)

AF:

0.00000918

AC:

AN:

1089464

Other (OTH)

AF:

0.000270

AC:

AN:

59270

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.308

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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:

0.0000981

AC:

AN:

142780

Hom.:

Cov.:

AF XY:

0.0000725

AC XY:

AN XY:

68980

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000180

AC:

AN:

38948

American (AMR)

AF:

0.000143

AC:

AN:

13990

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3326

East Asian (EAS)

AF:

0.000413

AC:

AN:

4840

South Asian (SAS)

AF:

0.00

AC:

AN:

4166

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9796

Middle Eastern (MID)

AF:

0.00

AC:

AN:

300

European-Non Finnish (NFE)

AF:

0.0000464

AC:

AN:

64614

Other (OTH)

AF:

0.00

AC:

AN:

1944

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.296

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.00

Hom.:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

TTN-related disorder

Uncertain:1

Oct 09, 2023

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The TTN c.37502C>T variant is predicted to result in the amino acid substitution p.Pro12501Leu. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.035% of alleles in individuals of African descent in gnomAD (http://gnomad.broadinstitute.org/variant/2-179523473-G-A). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Autosomal recessive limb-girdle muscular dystrophy type 2J;C1858763:Dilated cardiomyopathy 1G

Uncertain:1

May 16, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Apr 18, 2018

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Primary dilated cardiomyopathy

Benign:1

Genetics and Genomics Program, Sidra Medicine

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.44

CADD

Benign

(source)

DANN

Benign

0.80

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.45

FATHMM_MKL

Benign

0.088

LIST_S2

Benign

0.45

T;.

M_CAP

Benign

0.012

MetaRNN

Benign

0.10

T;T

MetaSVM

Benign

-1.1

PhyloP100

0.058

Vest4

0.15

MVP

0.49

MPC

0.15

ClinPred

0.030

GERP RS

3.5

Mutation Taster

=89/11

polymorphism

(source)

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

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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