rs727503690

Positions:

• chr2-178774035-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001267550.2(TTN):​c.7133A>G​(p.Lys2378Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,788 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: TTN NM_001267550.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.19

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-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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TTN. . Gene score misZ -1.1021 (greater than the threshold 3.09). Trascript score misZ 6.9794 (greater than threshold 3.09). GenCC has associacion of gene with dilated cardiomyopathy, tibial muscular dystrophy, early-onset myopathy with fatal cardiomyopathy, autosomal recessive centronuclear myopathy, hypertrophic cardiomyopathy, hypertrophic cardiomyopathy 9, TTN-related myopathy, dilated cardiomyopathy 1G, arrhythmogenic right ventricular cardiomyopathy, myopathy, myofibrillar, 9, with early respiratory failure, familial isolated dilated cardiomyopathy, childhood-onset progressive contractures-limb-girdle weakness-muscle dystrophy syndrome, autosomal recessive limb-girdle muscular dystrophy type 2J.
• BP4: Computational evidence support a benign effect (MetaRNN=0.13660094).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTN	NM_001267550.2	c.7133A>G	p.Lys2378Arg	missense_variant	31/363	ENST00000589042.5	NP_001254479.2
TTN	NM_133379.5	c.7133A>G	p.Lys2378Arg	missense_variant	31/46	ENST00000360870.10	NP_596870.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTN	ENST00000589042.5	c.7133A>G	p.Lys2378Arg	missense_variant	31/363	5	NM_001267550.2	ENSP00000467141	P1
TTN	ENST00000360870.10	c.7133A>G	p.Lys2378Arg	missense_variant	31/46	5	NM_133379.5	ENSP00000354117
TTN-AS1	ENST00000659121.1	n.1654-192T>C		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 250986 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135612

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461788 Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3 AN XY: 727196

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Feb 06, 2014

Variant classified as Uncertain Significance - Favor Benign. The Lys2378Arg vari ant in TTN has not been previously reported in individuals with cardiomyopathy a nd was absent from large population studies. Lysine (Lys) at position 2378 is poorly conserved in evolution (1 mammal and multiple fish species carrying the v ariant amino acid), supporting that this change may be tolerated. Additional com putational prediction tools do not provide strong support for or against an impa ct to the protein. Although the presence of the variant amino acid in multiple other species supports that the Lys2378Arg variant may be benign, additional stu dies are needed to fully assess its clinical significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.084	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	21
DANN	Benign	0.95
Eigen	Benign	-0.064
Eigen_PC	Benign	0.14
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Uncertain	0.93	D;D;D;.;D;D;D;D
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.14	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.84	T
MutationTaster	Benign	1.0	N;N;N;N;N;N;N
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-1.6	N;N;.;.;N;N;.;N
REVEL	Benign	0.28
Sift	Benign	0.61	T;T;.;.;T;T;.;T
Sift4G	Benign	0.30	.;.;.;.;.;.;.;T
Polyphen		0.031, 0.72	.;.;.;B;.;.;B;P
Vest4		0.17
MutPred		0.52		Loss of methylation at K2378 (P = 0.0248);.;Loss of methylation at K2378 (P = 0.0248);Loss of methylation at K2378 (P = 0.0248);.;.;Loss of methylation at K2378 (P = 0.0248);Loss of methylation at K2378 (P = 0.0248);
MVP		0.24
MPC		0.078
ClinPred		0.22	T
GERP RS		5.7

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

Other links and lift over

dbSNP: rs727503690; hg19: chr2-179638762;