Titin Variants in Dilated Cardiomyopathy

TTN Transcript / Exon Structure & Truncating Variants in Cardiomyopathy Studies

Titin - Exon 138

Details for Exon 138 of the Titin gene - Sequence Coordinates, Associated Transcripts, Functional Data, Truncating Variants and Sequence.

The exon number is based on the LRG numbering, as recommended for clinical reporting.

Coordinates

The genomic coordinates of HG19 and Locus Reference Genomic (LRG) and the CDS coordinates of the Titin meta-transcript for exon 138 are displayed below.

HG19 Genomic Locus Reference Genomic Meta-Transcript
StartEnd StartEnd StartEnd
179,546,177 179,546,103 154,353 154,42733,173 33,247

Transcripts

Exon 138 occurs in the following Titin transcripts (the number indicates the exon rank of exon 138 in each transcript).

METAN2BAN2BN2ANOVEX-1NOVEX-2NOVEX-3
137 135 - 134 - - -

Functional Data

Region: This exon occurs in the I-band region of the titin protein.

PSI: The "proportion spliced-in" (an estimate of the percentage of TTN transcripts that incorporate this exon based on RNAseq data) is 4% in DCM (LV tissue of 84 end-stage patients) and 7% in GTEx (LV tissue of 105 samples from Genotype-Tissue Expression project). (See Ref. 1 for details)

Symmetry: This exon is symmetric, i.e. the length of the exon is a multiple of three and therefore removal of it will not alter the reading frame.

References
1. A. M. Roberts, J. S. Ware, D. S. Herman et al. Integrated allelic, transcriptional, and phenomic dissection of the cardiac effects of titin truncations in health and disease. Sci. Transl. Med. 7, 270ra6 (2015).

Truncating Variants

No TTN truncating variants affecting this exon have been described in major published studies.

Sequence

Size of Exon: 75 bases           Ensembl ID: ENSE00002297407

TGCTGAAGAAAGCTGTCCCTGAAGAAAAAGTACCAGTGCCCATTCCTAAGAAACTCAAACCTCCACCACCCAAAG

ATGC = coding sequence, ATGC = non-coding sequence