Cloning and analysis of 5' flanking sequence of -amylase gene from Ctenopharyngodon idellus

PCR and Genome Walking methods were applied to obtain a 168 bp -amylase gene exonⅠsequence and a 2 063 bp -amylase gene 5' flanking sequence from grass carp (Ctenopharyngodon idellus). The sequence alignment of -amylase gene exon Ⅰ between grass carp and other fishes showed that the similarity was 68%~86%. The sequence analysis of -amylase gene 5' flanking sequence of grass carp confirmed a transcription initiation region anda transcriptional start site (TSS). There were a TATA-box at 30 bp and a CAAT-box at58 bp. There were some transcriptional factor binding sites in the -amylase gene 5' flanking sequence, such as GATA-1, OCT-1, GR, HNF-3, AP1 and SP1. The -amylase gene 5' flanking sequence of grass carp was cloned successfully, which provides references for studies on differences of -amylase gene 5' flanking sequence amongdifferent feeding fishes, as well as on the expression, function and regulation mechanism of -amylase gene in fishes.