ArticleFish physiology and biochemistry2008
The growth hormone-encoding gene isolated and characterized from Labeo rohita Hamilton is expressed in CHO cells under the control of constitutive promoters in 'autotransgene' constructs.
Article in Fish physiology and biochemistry, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The growth hormone (GH) gene along with its regulatory sequences has been isolated from the blood and pituitary gland of Labeo rohita. This GH gene is approximately 2.8 kb long and consists of five exons and four introns of varying sizes with AG/TA in its exon-intron junctions. The promoter has a single cyclic AMP response unit (CRE) element, TATA, CAT and several Pit 1 binding sequences. The 1169-bp gene transcript starts 54 bp upstream of the ATG initiation codon and has two polyadenylation signals, ATTAAA, after the TAG stop codon. The mature mRNA has the poly (A) tail inserted 16 bp downstream of the second polyadenylation signal. Four chimeric 'autotransgenes' were constructed having either histone 3 or beta-actin promoter and cDNA or the total GH gene. The functionality of the individual components of the autotransgene was determined in the Chinese hamster ovary (CHO) cells by transfection experiments. Based on the results, the transcription of the GH gene is initiated at the transcription start signal of the respective promoters and terminates at the 3' regulatory sequence of the GH gene. Expression of GH in CHO cells shows that the fish promoters are active, the splicing signal is recognized, and the mRNA produced is stable and translated. The GH protein produced is effectively translocated and secreted into the medium. These results indicate the usefulness of CHO cells in determining the property of individual components of autotransgenes constructed from L. rohita and overall functional commonality between fish and mammal.
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