2-178647040-GTATATATATA-GTATATATATATATATATATATATATATATATATA

Position:

• chr2-178647040-GTATATATATA-GTATATATATATATATATATATATATATATATATA

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 0P and 0B.

The NM_001267550.2(TTN):​c.40222+23_40222+24insTATATATATATATATATATATATA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000112 in 143,340 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 21)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TTN NM_001267550.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.212

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]

LOC124906100 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TTN	NM_001267550.2	c.40222+23_40222+24insTATATATATATATATATATATATA		intron_variant		ENST00000589042.5
LOC124906100	XR_007087318.1	n.2185+2561_2185+2562insTATATATATATATATATATATATA		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TTN	ENST00000589042.5	c.40222+23_40222+24insTATATATATATATATATATATATA		intron_variant		5	NM_001267550.2	P1
TTN-AS1	ENST00000659121.1	n.502+49381_502+49382insTATATATATATATATATATATATA		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.000112 AC: 16 AN: 143274 Hom.: 0 Cov.: 21

Gnomad AFR AF: 0.0000757

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000210

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00112

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000771

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 588112 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 292408

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.000112 AC: 16 AN: 143340 Hom.: 0 Cov.: 21 AF XY: 0.000115 AC XY: 8 AN XY: 69546

Gnomad4 AFR AF: 0.0000755

Gnomad4 AMR AF: 0.000209

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00113

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000771

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs10580462; hg19: chr2-179511767;