Organization of the male gonad in a protogynous fish,Thalassoma bifasciatum (Teleostei: Labridae)

2002 ◽  
Vol 254 (3) ◽  
pp. 292-311 ◽  
Author(s):  
Sasha Koulish ◽  
Charles R. Kramer ◽  
Harry J. Grier
Keyword(s):  
Thalassoma Bifasciatum ◽  
Male Gonad

scholarly journals Differential Segregation Patterns of Sperm Mitochondria in Embryos of the Blue Mussel (Mytilus edulis)

Genetics ◽  
2004 ◽  
Vol 166 (2) ◽  
pp. 883-894
Author(s):  
Liqin Cao ◽  
Ellen Kenchington ◽  
Eleftherios Zouros
Keyword(s):  
Mitochondrial Dna ◽  
Mytilus Edulis ◽  
Blue Mussel ◽  
Uniparental Inheritance ◽  
Male Gonad ◽  
Doubly Uniparental Inheritance ◽  
Organelle Genomes ◽  
Somatic Tissues ◽  
Tight Linkage ◽  
Mitotracker Green

Abstract In Mytilus, females carry predominantly maternal mitochondrial DNA (mtDNA) but males carry maternal mtDNA in their somatic tissues and paternal mtDNA in their gonads. This phenomenon, known as doubly uniparental inheritance (DUI) of mtDNA, presents a major departure from the uniparental transmission of organelle genomes. Eggs of Mytilus edulis from females that produce exclusively daughters and from females that produce mostly sons were fertilized with sperm stained with MitoTracker Green FM, allowing observation of sperm mitochondria in the embryo by epifluorescent and confocal microscopy. In embryos from females that produce only daughters, sperm mitochondria are randomly dispersed among blastomeres. In embryos from females that produce mostly sons, sperm mitochondria tend to aggregate and end up in one blastomere in the two- and four-cell stages. We postulate that the aggregate eventually ends up in the first germ cells, thus accounting for the presence of paternal mtDNA in the male gonad. This is the first evidence for different behaviors of sperm mitochondria in developing embryos that may explain the tight linkage between gender and inheritance of paternal mitochondrial DNA in species with DUI.

scholarly journals A Critical Point of Male Gonad Development: Neuroendocrine Correlates of Accelerated Testicular Growth in Rats during Early Life

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e93007 ◽  
Author(s):  
Nikolay N. Dygalo ◽  
Tatjana V. Shemenkova ◽  
Tatjana S. Kalinina ◽  
Galina T. Shishkina
Keyword(s):  
Critical Point ◽  
Early Life ◽  
Gonad Development ◽  
Male Gonad ◽  
Testicular Growth

‘Spontaneous’ sex reversal in organ cultures of the embryonic male gonad of the bird

Development ◽  
1974 ◽  
Vol 31 (3) ◽  
pp. 611-620
Author(s):  
Gregory F. Erickson
Keyword(s):  
Germ Cells ◽  
Primordial Germ Cells ◽  
Calf Serum ◽  
Sex Reversal ◽  
Biologically Active ◽  
Foetal Calf Serum ◽  
Developmental Sequence ◽  
Organ Cultures ◽  
Male Gonad ◽  
Ovarian Cortex

The left embryonic testis of the bird (4–8 days of incubation) was organ cultured in medium that contained 10% foetal calf serum. Under these conditions, the germinal epithelium (GE) of the 4-day gonad differentiates into an ovarian cortex and the male primordial germ cells (PGCs) complete a developmental sequence similar to normal oocytes, i.e. they divide mitotically, develop a Balbiani body, divide synchronously in groups of two, four, and eight germ cells, and some enter pre-leptotene. No medullary tissue develops in the 4-day explants. The pieces of 6- and 8-day gonad differentiate into true ovotestes in which the GE develops into a cortex and the medulla develops into seminiferous cords. The PGCs in the cortex differentiate as oocytes and those in the seminiferous cords differentiate as spermatogonia. The possibility that biologically active oestrogens are present in the growth medium is discussed.

Association of Thalassoma bifasciatum with Condylactis gigantea in the Bahamas

Copeia ◽  
1976 ◽  
Vol 1976 (2) ◽  
pp. 382 ◽  
Author(s):  
Robert P. Gendron ◽  
Kathleen Mayzel
Keyword(s):  
Thalassoma Bifasciatum ◽  
The Bahamas

Development of the Male Gonad

2017 ◽  
pp. 67-76
Author(s):  
Shilpa Sharma ◽  
Anand Kumar ◽  
Devendra K. Gupta
Keyword(s):  
Male Gonad
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