rs56128843

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001267550.2(TTN):c.1079G>C(p.Arg360Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00322 in 1,614,054 control chromosomes in the GnomAD database, including 67 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/17 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0061 ( 12 hom., cov: 33)

Exomes 𝑓: 0.0029 ( 55 hom. )

Consequence

TTN
NM_001267550.2 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:26

Conservation

PhyloP100: 1.10

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0042310655).

BP6

Variant 2-178795088-C-G is Benign according to our data. Variant chr2-178795088-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 46587.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-178795088-C-G is described in Lovd as [Benign]. Variant chr2-178795088-C-G is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.00607 (925/152338) while in subpopulation SAS AF= 0.0253 (122/4822). AF 95% confidence interval is 0.0217. There are 12 homozygotes in gnomad4. There are 476 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 12 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TTN	NM_001267550.2 link	c.1079G>C	p.Arg360Thr	missense_variant	Exon 7 of 363	ENST00000589042.5	NP_001254479.2	A0A0A0MTS7
TTN	NM_133379.5 link	c.1079G>C	p.Arg360Thr	missense_variant	Exon 7 of 46	ENST00000360870.10	NP_596870.2	Q8WZ42-6Q7Z3B7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TTN	ENST00000589042.5 link	c.1079G>C	p.Arg360Thr	missense_variant	Exon 7 of 363	5	NM_001267550.2	ENSP00000467141.1		A0A0A0MTS7
TTN	ENST00000360870.10 link	c.1079G>C	p.Arg360Thr	missense_variant	Exon 7 of 46	5	NM_133379.5	ENSP00000354117.4		Q8WZ42-6

Frequencies

GnomAD3 genomes

AF:

0.00603

AC:

918

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0138

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00425

Gnomad ASJ

AF:

0.00691

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.0245

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00184

Gnomad OTH

AF:

0.00478

GnomAD3 exomes

AF:

0.00544

AC:

1367

AN:

251086

Hom.:

AF XY:

0.00622

AC XY:

844

AN XY:

135686

show subpopulations

Gnomad AFR exome

AF:

0.0166

Gnomad AMR exome

AF:

0.00171

Gnomad ASJ exome

AF:

0.00834

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0229

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00197

Gnomad OTH exome

AF:

0.00473

GnomAD4 exome

AF:

0.00292

AC:

4268

AN:

1461716

Hom.:

Cov.:

AF XY:

0.00349

AC XY:

2540

AN XY:

727150

show subpopulations

Gnomad4 AFR exome

AF:

0.0161

Gnomad4 AMR exome

AF:

0.00170

Gnomad4 ASJ exome

AF:

0.00781

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0222

Gnomad4 FIN exome

AF:

0.0000563

Gnomad4 NFE exome

AF:

0.00112

Gnomad4 OTH exome

AF:

0.00431

GnomAD4 genome

AF:

0.00607

AC:

925

AN:

152338

Hom.:

Cov.:

AF XY:

0.00639

AC XY:

476

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.0139

Gnomad4 AMR

AF:

0.00425

Gnomad4 ASJ

AF:

0.00691

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.0253

Gnomad4 FIN

AF:

0.0000941

Gnomad4 NFE

AF:

0.00184

Gnomad4 OTH

AF:

0.00473

Alfa

AF:

0.00256

Hom.:

Bravo

AF:

0.00603

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00182

AC:

ESP6500AA

AF:

0.0141

AC:

ESP6500EA

AF:

0.00221

AC:

ExAC

AF:

0.00619

AC:

752

Asia WGS

AF:

0.0110

AC:

AN:

3478

EpiCase

AF:

0.00284

EpiControl

AF:

0.00302

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:26

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:11

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -

Oct 17, 2013

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 24, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: research

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

May 20, 2024

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 17, 2014

GeneDx

Significance: 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. -

Oct 08, 2019

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

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: TTN c.1079G>C (p.Arg360Thr) results in a non-conservative amino acid change located in the Z-disk of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0054 in 251086 control chromosomes, predominantly at a frequency of 0.023 within the South Asian subpopulation in the gnomAD database, including 14 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 36.79 fold of the estimated maximal expected allele frequency for a pathogenic variant in TTN causing Cardiomyopathy phenotype (0.00063), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as benign. -

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided

Benign:3

Nov 14, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Autosomal recessive limb-girdle muscular dystrophy type 2J

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Sep 10, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Early-onset myopathy with fatal cardiomyopathy

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Sep 10, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Tibial muscular dystrophy

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Sep 10, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Myopathy, myofibrillar, 9, with early respiratory failure

Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Sep 10, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiomyopathy

Benign:1

Feb 22, 2017

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dilated cardiomyopathy 1G

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cardiovascular phenotype

Benign:1

Jul 05, 2013

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as benign based on a combination of the following: population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.26

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.27

CADD

Benign

DANN

Benign

0.88

Eigen

Benign

-0.14

Eigen_PC

Benign

0.051

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.77

T;T;T;.;T;T;T;T

MetaRNN

Benign

0.0042

T;T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

PrimateAI

Benign

0.44

PROVEAN

Benign

-2.2

N;N;.;.;N;N;.;D

REVEL

Benign

0.20

Sift

Benign

0.20

T;T;.;.;T;T;.;D

Sift4G

Benign

0.15

.;.;.;.;.;.;.;T

Polyphen

0.049, 0.62

.;.;.;B;.;.;B;P

Vest4

0.21

MVP

0.33

MPC

0.13

ClinPred

0.0049

GERP RS

4.4

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