Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/201329
Type: Artigo de periódico
Title: Male Gonadal Differentiation And The Paedomorphic Evolution Of The Testis In Teleostei.
Author: Mazzoni, Talita Sarah
Grier, Harry J
Quagio-Grassiotto, Irani
Abstract: Testis differentiation from representatives of the Otophysi (Cyprinus carpio), Percomorpha (Amatitlania nigrofasciata), and Atherinomorpha (Poecilia reticulata) was comparatively described. In the undifferentiated gonad of C. carpio, the primordial germ cells (PGCs) are scattered throughout the gonads while in A. nigrofasciata and P. reticulata the PGCs are restricted to the ventral periphery. In the dorsal region of the developing gonads, with the exception of C. carpio, somatic cell rearrangements result in the differentiation of the sperm duct. Pre-Sertoli cells wrap around single spermatogonia forming cysts that proliferate forming acinar-clusters. In C. carpio and A. nigrofasciata, the cysts in each acinar-cluster move away from each other, creating a central lumen. In C. carpio, the acinar-clusters then fuse to each other forming tubules that become lined by the germinal epithelium. Subsequently, the tubules anastomose dorsally and create the sperm duct. In A. nigrofasciata, the acinar-clusters elongate, forming lobules that individually connect to the sperm duct. These are lined by the germinal epithelium. In P. reticulata, the spermatogonial cysts remain in the acinar-cluster organization. Subsequently, developing ducts connect each cluster to the sperm duct and lobules subsequently develop. In the differentiated testis of C. carpio and A. nigrofasciata, spermatogonia are distributed along the lengths of the anastomosing tubules or lobules, respectively. However, in P. reticulata, the spermatogonia remain restricted to the terminal end of the lobules. Considering testis ontogeny, the spermatogonial acinar-cluster is the adult characteristic of more derived taxa that approximate the early gonad developmental stages of the basal taxa.
Subject: Animals
Biological Evolution
Fishes
Male
Organogenesis
Sertoli Cells
Sex Differentiation
Species Specificity
Spermatogenesis
Spermatogonia
Testis
Atherinomorpha
Ostariophysi
Percomorpha
Germinal Epithelium
Gonadal Differentiation
Rights: fechado
Identifier DOI: 10.1002/ar.22915
Address: http://www.ncbi.nlm.nih.gov/pubmed/24740886
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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