BigPatents India

A transcript mapping method according to an embodiment of the invention is described hereinafter and combines short tag based (SAGE and MPSS) efficiency with the accuracy of full-length cDNA (flcDNA) for comprehensive characterization of transcriptomes. This method is also referred to as Gene Identification Signature (GIS) analysis. In this method, the 5' and 3' ends of full-length cDNA clones are initially extracted into a ditag structure, with the ditag concatemers of the ditag being subsequently sequenced in an efficient manner, and finally mapped to the genome for defming the gene structure. As a GIS ditag represents the 5' and 3' ends of a transcript, it is more informative than SAGE and MPSS tags. Segment lengths between 5' and 3" tag pairs are obtainable including orientation, ordering and chromosome family for efficient transcript mapping and gene location identifîcation. Furthermore, a compressed suffix array (C S A) is used for indexing the genome sequence for improve mapping speed and to reduce computaional mernory requirements.