Genetic Variant NM_001267550.2:c.12117C>T (chr2-178741116-G-A) – ACMG Classification: Benign (-21 pts)

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BA1

The NM_001267550.2(TTN):c.12117C>T(p.Pro4039Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00372 in 1,613,698 control chromosomes in the GnomAD database, including 182 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.020 ( 99 hom., cov: 32)

Exomes 𝑓: 0.0021 ( 83 hom. )

Consequence

TTN
NM_001267550.2 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:17

Conservation

PhyloP100: 0.111

Publications

2 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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

BP6

Variant 2-178741116-G-A is Benign according to our data. Variant chr2-178741116-G-A is described in ClinVar as Benign. ClinVar VariationId is 47816.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.111 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0664 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001267550.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TTN	NM_001267550.2	MANE Select	c.12117C>T	p.Pro4039Pro	synonymous	Exon 48 of 363	NP_001254479.2	Q8WZ42-12
TTN	NM_001256850.1		c.11166C>T	p.Pro3722Pro	synonymous	Exon 46 of 313	NP_001243779.1	Q8WZ42-1
TTN	NM_133437.4		c.11604C>T	p.Pro3868Pro	synonymous	Exon 46 of 192	NP_597681.4	A0A0A0MRA3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TTN	ENST00000589042.5	TSL:5 MANE Select	c.12117C>T	p.Pro4039Pro	synonymous	Exon 48 of 363	ENSP00000467141.1	Q8WZ42-12
TTN	ENST00000446966.2	TSL:1	c.12117C>T	p.Pro4039Pro	synonymous	Exon 48 of 361	ENSP00000408004.2	A0A1B0GXE3
TTN	ENST00000436599.2	TSL:1	c.11841C>T	p.Pro3947Pro	synonymous	Exon 46 of 361	ENSP00000405517.2	A0A0C4DG59

Frequencies

GnomAD3 genomes

AF:

0.0196

AC:

2976

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0685

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00517

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000323

Gnomad OTH

AF:

0.0163

GnomAD2 exomes

AF:

0.00477

AC:

1183

AN:

248218

AF XY:

0.00370

show subpopulations

Gnomad AFR exome

AF:

0.0675

Gnomad AMR exome

AF:

0.00255

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000267

Gnomad OTH exome

AF:

0.00266

GnomAD4 exome

AF:

0.00207

AC:

3023

AN:

1461436

Hom.:

Cov.:

AF XY:

0.00180

AC XY:

1308

AN XY:

727008

show subpopulations

African (AFR)

AF:

0.0730

AC:

2442

AN:

33474

American (AMR)

AF:

0.00293

AC:

131

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39686

South Asian (SAS)

AF:

0.000197

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53252

Middle Eastern (MID)

AF:

0.00538

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000980

AC:

109

AN:

1111804

Other (OTH)

AF:

0.00485

AC:

293

AN:

60370

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

195

389

584

778

973

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

160

240

320

400

<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:

0.0196

AC:

2987

AN:

152262

Hom.:

Cov.:

AF XY:

0.0188

AC XY:

1399

AN XY:

74446

show subpopulations

African (AFR)

AF:

0.0685

AC:

2847

AN:

41544

American (AMR)

AF:

0.00517

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.000622

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000323

AC:

AN:

68010

Other (OTH)

AF:

0.0161

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

136

272

409

545

681

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

120

150

<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:

0.00954

Hom.:

Bravo

AF:

0.0225

Asia WGS

AF:

0.00318

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000415

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (6)

not provided (3)

Autosomal recessive limb-girdle muscular dystrophy type 2J (1)

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

Cardiomyopathy (1)

Cardiovascular phenotype (1)

Early-onset myopathy with fatal cardiomyopathy (1)

Myopathy, myofibrillar, 9, with early respiratory failure (1)

Tibial muscular dystrophy (1)

TTN-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

1.2

(source)

DANN

Benign

0.32

PhyloP100

0.11

Mutation Taster

=100/0

polymorphism (auto)

(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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over