2-178751146-A-T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_133379.5(TTN):​c.11254T>A​(p.Ser3752Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000169 in 1,612,716 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/15 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00096 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000086 ( 0 hom. )

Consequence

TTN
NM_133379.5 missense

Scores

15

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 0.217
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]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4
Computational evidence support a benign effect (MetaRNN=0.0045254827).
BP6
Variant 2-178751146-A-T is Benign according to our data. Variant chr2-178751146-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 166277.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Uncertain_significance=1}. Variant chr2-178751146-A-T is described in Lovd as [Benign].

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
TTNNM_133379.5 linkuse as main transcriptc.11254T>A p.Ser3752Thr missense_variant 46/46 ENST00000360870.10 NP_596870.2 Q8WZ42-6Q7Z3B7
TTNNM_001267550.2 linkuse as main transcriptc.11311+1978T>A intron_variant ENST00000589042.5 NP_001254479.2 A0A0A0MTS7

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
TTNENST00000360870.10 linkuse as main transcriptc.11254T>A p.Ser3752Thr missense_variant 46/465 NM_133379.5 ENSP00000354117.4 Q8WZ42-6
TTNENST00000589042.5 linkuse as main transcriptc.11311+1978T>A intron_variant 5 NM_001267550.2 ENSP00000467141.1 A0A0A0MTS7

Frequencies

GnomAD3 genomes
AF:
0.000961
AC:
146
AN:
151960
Hom.:
0
Cov.:
32
show subpopulations
Gnomad AFR
AF:
0.00340
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.000329
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:
0.00
GnomAD3 exomes
AF:
0.000265
AC:
66
AN:
249070
Hom.:
0
AF XY:
0.000186
AC XY:
25
AN XY:
134694
show subpopulations
Gnomad AFR exome
AF:
0.00360
Gnomad AMR exome
AF:
0.000233
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS 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:
0.0000863
AC:
126
AN:
1460638
Hom.:
0
Cov.:
73
AF XY:
0.0000729
AC XY:
53
AN XY:
726564
show subpopulations
Gnomad4 AFR exome
AF:
0.00317
Gnomad4 AMR exome
AF:
0.000202
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.00
Gnomad4 OTH exome
AF:
0.000182
GnomAD4 genome
AF:
0.000960
AC:
146
AN:
152078
Hom.:
0
Cov.:
32
AF XY:
0.000968
AC XY:
72
AN XY:
74348
show subpopulations
Gnomad4 AFR
AF:
0.00339
Gnomad4 AMR
AF:
0.000328
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.00
Gnomad4 SAS
AF:
0.00
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.00
Gnomad4 OTH
AF:
0.00
Alfa
AF:
0.0000298
Hom.:
0
Bravo
AF:
0.00105
ESP6500AA
AF:
0.00432
AC:
19
ESP6500EA
AF:
0.00
AC:
0
ExAC
AF:
0.000371
AC:
45
Asia WGS
AF:
0.000289
AC:
1
AN:
3478

ClinVar

Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:1Benign:4
Revision: criteria provided, conflicting classifications
LINK: link

Submissions by phenotype

not specified Uncertain:1Benign:1
Likely benign, criteria provided, single submitterclinical testingLaboratory for Molecular Medicine, Mass General Brigham Personalized MedicineMar 19, 2012Ser3752Thr in exon 45A of TTN: This variant is not expected to have clinical sig nificance because it has been identified in 0.4% (15/3726) of African American c hromosomes from a broad population by the NHLBI Exome Sequencing Project (http:/ /evs.gs.washington.edu/EVS; dbSNP rs144209883). Ser3752Thr in exon 45A of TTN ( rs144209883; allele frequency = 0.4%, 15/3726) ** -
Uncertain significance, criteria provided, single submitterclinical testingGeneDxAug 16, 2016Missense variants in the TTN gene are considered 'unclassified' if they are not previously reported in the literature and do not have >1% frequency in the population to be considered a polymorphism. Research indicates that truncating mutations in the TTN gene are expected to account for approximately 25% of familial and 18% of sporadic idiopathic DCM; however, truncating variants in the TTN gene have been reported in approximately 3% of reported control alleles. There has been little investigation into non-truncating variants. (Herman D et al. Truncations of titin causing dilated cardiomyopathy. N Eng J Med 366:619-628, 2012) The variant is found in CARDIOMYOPATHY panel(s). -
not provided Benign:2
Likely benign, criteria provided, single submitterclinical testingCeGaT Center for Human Genetics TuebingenApr 01, 2024TTN: BP4 -
Likely benign, criteria provided, single submitterclinical testingARUP Laboratories, Molecular Genetics and Genomics, ARUP LaboratoriesSep 06, 2023- -
TTN-related disorder Benign:1
Likely benign, no assertion criteria providedclinical testingPreventionGenetics, part of Exact SciencesJan 11, 2021This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Benign
-0.63
T
BayesDel_noAF
Benign
-0.68
CADD
Benign
5.1
DANN
Benign
0.51
Eigen
Benign
-1.0
Eigen_PC
Benign
-1.0
FATHMM_MKL
Benign
0.034
N
LIST_S2
Benign
0.28
T
M_CAP
Benign
0.0047
T
MetaRNN
Benign
0.0045
T
MetaSVM
Benign
-1.0
T
PROVEAN
Benign
-0.51
N
REVEL
Benign
0.078
Sift
Benign
0.46
T
Sift4G
Benign
0.38
T
Polyphen
0.0060
B
Vest4
0.24
MVP
0.15
ClinPred
0.014
T
GERP RS
1.5

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.

Other links and lift over

dbSNP: rs144209883; hg19: chr2-179615873; API