chr2-178770061-C-A

Position:

• chr2-178770061-C-A

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.8640G>T​(p.Glu2880Asp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. E2880E) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TTN NM_001267550.2 missense, splice_region
• Scores: Splicing: ADA: 0.0001652
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.80

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=0.11280832).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TTN	NM_001267550.2	c.8640G>T	p.Glu2880Asp	missense_variant, splice_region_variant	36/363	ENST00000589042.5
TTN	NM_133379.5	c.8640G>T	p.Glu2880Asp	missense_variant, splice_region_variant	36/46	ENST00000360870.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TTN	ENST00000589042.5	c.8640G>T	p.Glu2880Asp	missense_variant, splice_region_variant	36/363	5	NM_001267550.2	P1
TTN	ENST00000360870.10	c.8640G>T	p.Glu2880Asp	missense_variant, splice_region_variant	36/46	5	NM_133379.5
TTN-AS1	ENST00000659121.1	n.1593-3214C>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Benign	-0.073	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	18
DANN	Benign	0.83
Eigen	Benign	-0.31
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.71	T;T;T;.;T;T;T;T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.11	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.95	T
MutationTaster	Benign	0.99	D;N;N;N;N;N;N
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-2.2	N;N;.;.;N;N;.;D
REVEL	Benign	0.17
Sift	Uncertain	0.016	D;T;.;.;T;T;.;T
Sift4G	Benign	0.13	.;.;.;.;.;.;.;T
Polyphen		0.018, 0.069	.;.;.;B;.;.;B;B
Vest4		0.14
MutPred		0.37		Loss of ubiquitination at K2876 (P = 0.1191);.;Loss of ubiquitination at K2876 (P = 0.1191);Loss of ubiquitination at K2876 (P = 0.1191);.;.;Loss of ubiquitination at K2876 (P = 0.1191);Loss of ubiquitination at K2876 (P = 0.1191);
MVP		0.088
MPC		0.078
ClinPred		0.12	T
GERP RS		3.3

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00017
dbscSNV1_RF	Benign	0.012
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-179634788;