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• W2071287730 abstract "There are two adult life history types among lamprey species, nonparasitic and parasitic, with the former commencing the final interval of sexual maturation immediately after metamorphosis. There are no extensive studies that directly compare hormone profiles during the life cycles of nonparasitic and parasitic lamprey species, yet such data may explain differences in development, reproductive maturation, and feeding status. The present study uses immunohistochemistry to show the life cycle profiles for gonadotropin-releasing hormones (GnRH-I and -III) in the brain of the nonparasitic species, the American brook lamprey, Lampetra appendix, for comparison with the extensive, published, immunohistochemical data on these hormones in the parasitic species, the sea lamprey, Petromyzon marinus. The complete cDNAs for the two lamprey prohormones, proopiocortin (POC), and proopiomelanotropin (POM), were cloned for L. appendix and both nucleotide and deduced amino acid sequences were compared with those previously published for P. marinus. The POC and POM cDNAs for both species were used in expression studies, with Northern blotting, throughout their life cycles. Although GnRH-I and -III immunohistochemistry revealed a similar distribution of immunoreactive cells and fibers in the two species during the life cycles, a qualitative evaluation of staining intensity in L. appendix, implied early activity in the brains of metamorphosis of this species, particularly in GnRH-I. GnRH-III seems to be important in larval life and early metamorphosis in both species. A novel feature of this immunohistochemical study is the monthly observations of the distribution and relative intensity of the two GnRHs during the critical period of final sexual maturation that lead to spawning and then the spent animal. L. appendix POC and POM nucleotide sequences had 92.9 and 94.6% identity, respectively, with P. marinus POC and POM and there was an earlier increase in their expression during metamorphosis and postmetamorphic life. Since there was some correlation between the timing of metamorphic development, gonad maturation, and brain irGnRH intensity with POC and POM expression in L. appendix, it was concluded that these prohormones yield posttranslational products that likely play a substantial role in development and maturation events that lead to the nonparasitic adult life history of this species." @default.
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• W2071287730 date "2006-08-01" @default.
• W2071287730 modified "2023-09-27" @default.
• W2071287730 title "Patterns of proopiomelanotropin and proopiocortin gene expression and of immunohistochemistry for gonadotropin-releasing hormones (lGnRH-I and III) during the life cycle of a nonparasitic lamprey: Relationship to this adult life history type" @default.
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• W2071287730 doi "https://doi.org/10.1016/j.ygcen.2005.10.015" @default.
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