Oogenesis and ovarian histology of the American alligatorAlligator mississippiensis

Uribe, Mari Carmen; Guillette, Louis J.

doi:10.1002/1097-4687(200009)245:3<225::aid-jmor4>3.0.co;2-m

Cited by 55 publications

(12 citation statements)

References 25 publications

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“…Machado-Santos et al arrived at a similar conclusion in 2015 while documenting their observations in a species of South American Alligator in Brazil [19]. They further demonstrated that each oocyte, depending on its stage of development, was enclosed by a layer of flattened to cuboidal epitheliod cells (corresponding to granulosa cells) which were closely associated with a connective tissue stroma which separated the granulosa cells from the Zona pellucida covering the oocytes (Tumkiratiwong et al 2012, Guraya 1989, Calderon et al, 2004, lance 1989, Urbe and Gullette 2008) [20][21][22][23][24]. Norris explained that these granulosa cells imbibed lipids (probably arising from progesterone and Estrogenic receptor) with development of the follicle and eventual transformation to Corpus luteum.…”

Section: Commentsmentioning

confidence: 87%

Comparative Histologic Evaluation of Vertebrate Ovaries

Odokuma

2018

Galician med. j.

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Comparative Anatomy is a subspecialty of Anatomical Sciences that deals with/involves the possible existing structural relatedness in organisms. By careful description of specific structures, organs or systems, comparisons are made that draw similarities or differences between organs. The aim of this area in Anatomy was to provide evolutionary or adaptive explanations for detected characteristics – including maintaining the ancestral line.Materials and MethodsPermission for this descriptive and observational study was obtained from the research and ethics committee of the Department of Human Anatomy and Cell Biology, Delta State University, Abraka (Number DELSU/CHS/ANA/118). Five female animals of the vertebrate class were used for the study (one from each vertebrate class). The animals included: cat fish (Clariasgariepinus); toad (Bufobufo); agama lizard (Agama agama); domestic chicken (Gallus gallusdomesticus) and the Wistar rat (Rattusnorvegicus).ResultsAll the studied vertebrates except mammals showed growth and maturation of several follicles confirming the characteristic of multiple gestation characteristic of these animals. The phases of growth were very similar in all of the studied organisms. These follicles were disposed in a fibrous stroma capable of influencing the activity of the ovary, Lacunae were only found in birds and mammals.ConclusionThe index study revealed several significant findings especially the occurrence of multiple stages of germ cell development in the female vertebrate gonads. These observations provided a vivid histologic basis for the argument of a common ancestral origin of the animal phylum albeit against the background of extensive impact of adaptational factors.

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Section: Commentsmentioning

confidence: 87%

Comparative Histologic Evaluation of Vertebrate Ovaries

Odokuma

2018

Galician med. j.

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“…Vitellogenesis proceeds as the follicles fill with yolk platelets prior to ovulation and await fertilization. Several papers have described these events in detail for specific species in each taxon: Crocodilia [Uribe and Guillette, 2000;Calderón et al, 2004;Moore et al, 2008Moore et al, , 2010a, Testudines [Callebaut et al, 1997;Hei et al, 2010;Pérez-Bermúdez et al, 2012], Squamata [Doddamani, 1994;Hernández-Franyutti et al, 2005;Vieira et al, 2010;Aldokhi et al, 2019;Delssin et al, 2019], Anura [Dumont, 1972;Ogielska and Kotusz, 2004;Piprek et al, 2017], andCaudata [Chardard andDournon, 1999;Chardard et al, 2003;Mendoza-Cruz et al, 2017]. For the purposes of this review, the remainder of this section will focus primarily on the major differences that exist across groups and important gaps that must be addressed to gain a comprehensive understanding of ovarian development in reptiles and amphibians.…”

Section: Differentiation and Maturation Of The Ovarymentioning

confidence: 99%

“…While the presence of germinal nests in the cortex is ubiquitous across groups, the number of nests varies substantially. Crocodilians, turtles, and frogs generally have several [Callebaut et al, 1997;Uribe and Guillette, 2000;Ogielska and Kotusz, 2004;Moore et al, 2008;Pérez-Bermúdez et al, 2012], while most squamates have 1 or 2, but as many as 6 nests [Jones et al, 1982;Aldokhi et al, 2019]. It has been hypothesized that germinal nest number is related to clutch size and frequency of reproduction [Guraya, 1989].…”

Section: Differentiation and Maturation Of The Ovarymentioning

confidence: 99%

“…The ovarian medulla in crocodilians and turtles develops a system of large lacunae that continually increase in size during ovarian maturation [Callebaut et al, 1997;Uribe and Guillette, 2000;Moore et al, 2010c;Pérez-Bermúdez et al, 2012]. Anurans and caudates also develop a similar central cavity within each ovarian sac, termed a lumen [Uribe, 2003;Ogielska and Kotusz, 2004], while squamates lack such a structure [Aldokhi et al, 2019;Delssin et al, 2019].…”

Section: Differentiation and Maturation Of The Ovarymentioning

confidence: 99%

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Sex Determination and Ovarian Development in Reptiles and Amphibians: From Genetic Pathways to Environmental Influences

Smaga

Bock

Johnson

et al. 2022

Sex Dev

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Background: Reptiles and amphibians provide untapped potential for discovering how a diversity of genetic pathways and environmental conditions are incorporated into developmental processes that can lead to similar functional outcomes. These groups display a multitude of reproductive strategies, and whereas many attributes are conserved within groups and even across vertebrates, several aspects of sexual development show considerable variation. Summary: In this review, we focus our attention on the development of the reptilian and amphibian ovary. First, we review and describe the events leading to ovarian development, including sex determination and ovarian maturation, through a comparative lens. We then describe how these events are influenced by environmental factors, focusing on temperature and exposure to anthropogenic chemicals. Lastly, we identify critical knowledge gaps and future research directions that will be crucial to moving forward in our understanding of ovarian development and the influences of the environment in reptiles and amphibians. Key Messages: Reptiles and amphibians provide excellent models for understanding the diversity of sex determination strategies and reproductive development. However, a greater understanding of the basic biology of these systems is necessary for deciphering the adaptive and potentially disruptive implications of embryo-by-environment interactions in a rapidly changing world.

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“…Impressive mechanisms that maintain the balance between the 45S pre-rRNA and 5S rRNA genes have been found in animals with 45S rDNA amplification in oocytes. In vertebrates, multiple NOR rDNA amplification accompanied by formation of numerous extrachromosomal nucleoli was described for oocytes of fish [ 13 , 14 , 15 ], amphibians [ 16 , 17 , 18 , 19 , 20 ], turtles [ 21 , 22 , 23 ], and crocodiles [ 24 , 25 ]. In these cases, the apparent imbalance between the doses of 18S, 5.8S, 28S, and 5S rRNA genes was counterbalanced by the presence of additional copies of 5S rRNA genes transcribed differentially in somatic cells and oocytes.…”

Section: Introductionmentioning

confidence: 99%

Single Copies of the 5S rRNA Inserted into 45S rDNA Intergenic Spacers in the Genomes of Nototheniidae (Perciformes, Actinopterygii)

Dyomin

Galkina

Ilina

et al. 2023

IJMS

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In the vast majority of Animalia genomes, the 5S rRNA gene repeats are located on chromosomes outside of the 45S rDNA arrays of the nucleolar organiser (NOR). We analysed the genomic databases available and found that a 5S rDNA sequence is inserted into the intergenic spacer (IGS) between the 45S rDNA repeats in ten species of the family Nototheniidae (Perciformes, Actinopterigii). We call this sequence the NOR-5S rRNA gene. Along with Testudines and Crocodilia, this is the second case of a close association between four rRNA genes within one repetitive unit in deuterostomes. In both cases, NOR-5S is oriented opposite the 45S rDNA. None of the three nucleotide substitutions compared to the canonical 5S rRNA gene influenced the 5S rRNA secondary structure. In transcriptomes of the Patagonian toothfish, we only found NOR-5S rRNA reads in ovaries and early embryos, but not in testis or somatic tissues of adults. Thus, we consider the NOR-5S gene to be a maternal-type 5S rRNA template. The colocalization of the 5S and 45S ribosomal genes appears to be essential for the equimolar production of all four rRNAs in the species that show rDNA amplification during oogenesis. Most likely, the integration of 5S and NOR rRNA genes occurred prior to Nototheniidae lineage diversification.

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Oogenesis and ovarian histology of the American alligatorAlligator mississippiensis

Cited by 55 publications

References 25 publications

Comparative Histologic Evaluation of Vertebrate Ovaries

Comparative Histologic Evaluation of Vertebrate Ovaries

Sex Determination and Ovarian Development in Reptiles and Amphibians: From Genetic Pathways to Environmental Influences

Single Copies of the 5S rRNA Inserted into 45S rDNA Intergenic Spacers in the Genomes of Nototheniidae (Perciformes, Actinopterygii)

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