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The aim of the present study was to understand the importance of the nuclear receptor Fushi tarazu factor 1 (FTZ-F1) in relation to vitellogenin genes expression in the fat body of Periplaneta mericana during the first vitellogenic cycle. Initially, a 342 bp fragment was cloned from the female fat body through degenerate primer RTPCR method. Its sequence analysis revealed high homology with other insects and animals FTZ-F1. In order to find the relation between the P. americana FTZ and vitellogenins, we analyzed the expression pattern of the latter in the fat body during vitellogensis. The PamFTZ transcript was detected during all stages of vitellogenesis in the fat body with a little increase in day 5, preceding the bulk of vitellogenin genes expression. We assumed that nuclear protein FTZ in the hemimetabolous insect, P. americana might functions as a competence factor that facilitates juvenile hormonal activation of gene expression as in holometabolous insect, Drosophila melanogaster.

egyptian academic journal of biological sciences. c, physiology and molecular biology/egyptian academic journal of biological sciences. c, physiology and  molecular biology

Nuclear receptor FTZ: partial cloning and expression pattern in fat body of the American cockroach Periplaneta americana (Linnaeus, 1758) during vitellogensis