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Harrylal CA, Lensink AV, Gupta SK, Aire TA. The ultrastructural features of the infundibulum of the green iguana, Iguana iguana. J Morphol 2023; 284:e21644. [PMID: 37856278 DOI: 10.1002/jmor.21644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 09/07/2023] [Accepted: 09/11/2023] [Indexed: 10/21/2023]
Abstract
The purpose of this study is to describe, in detail, the ultrastructure of the infundibulum of the sexually mature and active female green iguana, Iguana iguana. The infundibulum of five iguanas was remarkably distinct from the uterus, and was also clearly demarcated into cranial (expanded v-shaped) and caudal (tubular) divisions. Tissue samples obtained from five portions (three from the cranial division and two from the caudal division) of the infundibulum were processed conventionally for light and electron microscopy. The epithelial lining of the most anterior, middle, and posterior, parts of the cranial division displayed nonciliated cells predominantly, and occasionally ciliated cells. The numerous secretory granules in nonciliated type 1 cell found in the fimbrial aspect of the infundibulum were homogenous and deeply electron-dense, but those in the other two regions were variants of this cell type because they contained variably electron-dense secretory granules. Two main types of nonciliated cells (type 2 and its variant, type 3, as well as type 4) occurred in the epithelial lining of the caudal division of the infundibulum, but they, clearly, showed no dense secretory granules. Whereas the nonciliated type 2 cell and its variant (type 3 cell) contained large glycogen deposits, the type 4 cell lacked these deposits but its apical part contained large lipid-like droplets and, remarkably, blebbed into the duct lumen. The nonciliated cells lining the mucosal tubular glands contained highly electron-dense secretory granules, which were similar to those found in the nonciliated type 1 cell in the epithelial lining of the fimbrial part of the cranial division of the infundibulum.
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Affiliation(s)
- Crissy-Ann Harrylal
- Department of Anatomy, Physiology, and Pharmacology School of Veterinary Medicine, St. George's University, True Blue, Grenada
| | - Antoinette V Lensink
- Electron Microscope Unit, Department of Anatomy and Physiology, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa
| | - Sunil K Gupta
- Department of Anatomy, Physiology, and Pharmacology School of Veterinary Medicine, St. George's University, True Blue, Grenada
| | - Tom A Aire
- Department of Anatomy, Physiology, and Pharmacology School of Veterinary Medicine, St. George's University, True Blue, Grenada
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Nie H, Wen Y, Zhang R, Wu M, Zhang Y, Xu Y, Zhan J, Wu X. Histology, ultrastructure, and differential gene expression in relation to seasonal sperm storage in the oviduct of the Chinese alligator, Alligator sinensis. Reprod Fertil Dev 2022; 34:819-832. [PMID: 35577543 DOI: 10.1071/rd21191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 04/13/2022] [Indexed: 11/23/2022] Open
Abstract
Although oviductal sperm storage are essential steps in reproduction for female animals with internal fertilisation, no systematic study on the identification of genes involving sperm storage has been performed in crocodilian species. In the present research, the relationship between morphological variation related to sperm storage in the oviduct and gene expression patterns derived from RNA sequencing analyses between active period (AP), breeding period (BP), and hibernation period (HP) were investigated. The corresponding results indicated that sperm were observed not only in the ciliated cells within infundibulum and mucosal layer of uterus during BP, but also been detected in the spermatosperm storage tube (SST) in the anterior uterus at HP stage. The further transmission electron microscopy analysis indicated that the differences in the number and activity of the secretory cells likely to attributed to the seasonal variation of microenvironment related to the sperm storage. Based on the RNA-sequecing, 13147 DEGs related to the Peroxisome proliferator-activated receptors (PPARs) and FOXO signalling were identified, including these, the down-regulated ATG12 and BCL2L11 in the HP group may thus constitute an important point of convergence between autophagy and apoptosis involving the FOXO1 pathway. The genes involved in the PPARs pathway might modulate the immune response and thereby contribute to prolong the life span of stored spermatozoa in Alligator sinensis. The outcomes of this study provide fundamental insights into the mechanism of sperm storage in A. sinensis.
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Affiliation(s)
- Haitao Nie
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Yue Wen
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Ruidong Zhang
- College of Life Sciences, Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China
| | - Mengjuan Wu
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Yuqian Zhang
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Yunlu Xu
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Jixiang Zhan
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Xiaobing Wu
- Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
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3
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Souza E, Almeida‐Santos SM. Reproduction in the bushmaster (
Lachesis muta
): Uterine muscular coiling and female sperm storage. ACTA ZOOL-STOCKHOLM 2020. [DOI: 10.1111/azo.12369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Eletra Souza
- Departamento de Ecologia Instituto de Biociências Universidade de São Paulo São Paulo Brazil
- Departamento de Zoologia e Botânica Instituto de Biociências, Letras e Ciências Exatas Universidade Estadual Paulista “Júlio de Mesquita Filho” São José do Rio Preto Brazil
- Laboratório de Ecologia e Evolução Instituto Butantan São Paulo Brazil
| | - Selma Maria Almeida‐Santos
- Departamento de Zoologia e Botânica Instituto de Biociências, Letras e Ciências Exatas Universidade Estadual Paulista “Júlio de Mesquita Filho” São José do Rio Preto Brazil
- Laboratório de Ecologia e Evolução Instituto Butantan São Paulo Brazil
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Silva KMP, Barros VA, Rojas CA, Almeida-Santos SM. Infundibular sperm storage and uterine muscular twisting in the Amazonian lancehead, Bothrops atrox. Anat Rec (Hoboken) 2019; 303:3145-3154. [PMID: 31674144 DOI: 10.1002/ar.24309] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 09/19/2019] [Accepted: 09/26/2019] [Indexed: 11/08/2022]
Abstract
Although knowledge about the reproduction of snakes of the genus Bothrops has increased recently, many questions remain regarding sperm storage by these neotropical pitvipers. The relationship between two known sperm storage sites-the nonglandular uterus and the infundibulum-has yet to be detailed for Bothrops. In addition, the formation of uterine muscular twisting (UMT) and its function in sperm storage in the nonglandular uterus have been questioned. This article presents data on both sperm storage sites (posterior infundibulum and nonglandular uterus) in the Amazonian lancehead, Bothrops atrox, aiming to address the role of UMT in bothropoid reproduction considering female reproductive stages, timing of sperm storage, and morphology and histochemistry of sperm receptacles. The oviduct of B. atrox is composed of the infundibulum (anterior and posterior), the glandular uterus, the nonglandular uterus and the pouch. Sperm storage occurs in the posterior infundibulum and nonglandular uterus in vitellogenic females. In the posterior infundibulum sperm is stored in receptacles, while in the nonglandular uterus it is stored in crypts in the UMT of vitellogenic females. Both sperm storage sites possess granules testing positive for neutral mucopolysaccharides in the presence of spermatozoa, possibly favoring the conditions for spermatozoa surveillance during sperm storage in the reproductive tract.
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Affiliation(s)
- Karina M P Silva
- Programa de Pós-graduação em Anatomia dos Animais Domésticos e Silvestres, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil.,Laboratório de Ecologia e Evolução, Instituto Butantan, São Paulo, Brazil
| | - Verônica A Barros
- Laboratório de Ecologia e Evolução, Instituto Butantan, São Paulo, Brazil
| | - Claudio A Rojas
- Laboratório de Ecologia e Evolução, Instituto Butantan, São Paulo, Brazil
| | - Selma M Almeida-Santos
- Programa de Pós-graduação em Anatomia dos Animais Domésticos e Silvestres, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil.,Laboratório de Ecologia e Evolução, Instituto Butantan, São Paulo, Brazil
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Muniz‐Da‐Silva DF, Passos J, Siegel DS, Almeida‐Santos SM. Caudal oviduct coiling in a viperid snake,
Crotalus durissus. ACTA ZOOL-STOCKHOLM 2018. [DOI: 10.1111/azo.12271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Diego F. Muniz‐Da‐Silva
- Setor de Anatomia, Departamento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia Universidade São Paulo, Cidade Universitária São Paulo Brazil
- Laboratório de Ecologia e Evolução Instituto Butantan São Paulo Brazil
| | - Juliana Passos
- Setor de Anatomia, Departamento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia Universidade São Paulo, Cidade Universitária São Paulo Brazil
- Laboratório de Ecologia e Evolução Instituto Butantan São Paulo Brazil
| | - Dustin S. Siegel
- Department of Biology Southeast Missouri State University Cape Girardeau Missouri
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Rojas CA, Barros VA, Almeida-Santos SM. A histological and ultrastructural investigation of the female reproductive system of the water snake (Erythrolamprus miliaris
): Oviductal cycle and sperm storage. ACTA ZOOL-STOCKHOLM 2017. [DOI: 10.1111/azo.12234] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Loebens L, Rojas CA, Almeida-Santos SM, Cechin SZ. Reproductive biology ofPhilodryas patagoniensis(Snakes: Dipsadidae) in south Brazil: Female reproductive cycle. ACTA ZOOL-STOCKHOLM 2017. [DOI: 10.1111/azo.12200] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luiza Loebens
- Laboratory of Herpetology; Santa Maria Federal University; Santa Maria Rio Grande do Sul Brazil
| | | | | | - Sonia Zanini Cechin
- Laboratory of Herpetology; Santa Maria Federal University; Santa Maria Rio Grande do Sul Brazil
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8
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Villagrán-SantaCruz M, Mendoza-Cruz E, Granados-González G, Rheubert JL, Hernández-Gallegos O. Sperm storage in the viviparous lizard Sceloporus bicanthalis (Squamata: Phrynosomatidae), a species with continuous spermatogenesis. ZOOMORPHOLOGY 2016. [DOI: 10.1007/s00435-016-0327-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Sperm storage and morphofunctional bases of the female reproductive tract of the snake Philodryas patagoniensis from southeastern Brazil. ZOOMORPHOLOGY 2015. [DOI: 10.1007/s00435-015-0283-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Le Y, Chen S, Hu L, Zhang L, Ullah S, Liu T, Yang P, Liu Y, Chen Q. B-cell lymphoma-2 localization in the female reproductive tract of the Chinese soft-shelled turtle, Pelodiscus sinensis and its relationship with sperm storage. Anat Rec (Hoboken) 2015; 298:2011-7. [PMID: 26285642 DOI: 10.1002/ar.23258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/11/2015] [Accepted: 06/20/2015] [Indexed: 01/20/2023]
Abstract
The aim of the present study was to investigate the expression and localization of B-cell lymphoma-2 (Bcl-2) in the oviduct of the Chinese soft-shelled turtle, Pelodiscus sinensis, during the reproductive cycle to analyze the relationship between Bcl-2 and sperm storage. Bcl-2 expression was confirmed in the P. sinensis oviduct by western blot analysis. Hematoxylin-eosin staining showed that female P. sinensis stored sperm from November to April of the following year. The oviduct showed positive immunostaining for Bcl-2 of epithelial ciliated cells, gland ducts, and gland cells. Bcl-2 expression in the oviduct was associated with sperm storage occurrence. This indicates that the survival factor Bcl-2 may play a role in P. sinensis sperm storage.
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Affiliation(s)
- Yuan Le
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Shaofan Chen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Lisi Hu
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Linli Zhang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Shakeeb Ullah
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Tengfei Liu
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Ping Yang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Yi Liu
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Qiusheng Chen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, People's Republic of China
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11
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Shankar G, Sagar BKC, Kumari TRS, Marathe GK. Ultrastructural Features of Sperm Storage Tubules in the Oviduct of the Indian Garden Lizard, Calotes Versicolor. Anat Rec (Hoboken) 2015; 298:1932-7. [PMID: 26270354 DOI: 10.1002/ar.23257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 06/13/2015] [Accepted: 06/18/2015] [Indexed: 11/06/2022]
Abstract
This study provides the first description of the ultrastructural features of sperm storage tubules (SSTs) in the uterovaginal region of the oviduct of the Indian garden lizard, Calotes versicolor. Abundant spermatozoa along with copious secretory material were found in the lumen of the SSTs. These secretory granules appeared similar in electron density to those found in the epithelial cells lining the SSTs indicating their similar origin. The close physical proximity of sperm with these granules suggests an intimate association between the two. The present study is also the first report of recovery of motile sperm from the flushings of SSTs in C. versicolor. The density of sperm found in the flushings varied, being most abundant during the reproductive phase and minimum/absent during the regressive phase. Understanding the microenvironment of the SSTs, the nature of the secretory granules and their interaction with sperm can guide us in unraveling the biology of oviductal sperm storage.
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Affiliation(s)
- Goutham Shankar
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysore, Karnataka, India.,Department of Zoology, St. Philomena's College, Bannimantap, Mysore, Karnataka, India
| | | | | | - Gopal Kedihithlu Marathe
- Department of Studies in Biochemistry, University of Mysore, Manasagangotri, Mysore, Karnataka, India
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Abstract
The reproductive biology of Bothrops erythromelas, a small pit viper from the Caatinga, a semiarid biome in Brazil, is described based on analysis of individuals deposited in zoological collections. Males are smaller and also attain sexual maturity at a smaller size than females. Female reproductive cycle is seasonal with an extended period of secondary vitellogenesis and births occurring in a restricted period from late spring to early summer. Sperm storage in females may probably occur in infundibular tubular glands and uterine muscular twisting (UMT), which is a polymorphic condition within B. erythromelas. Seasonal spermatogenesis in males is variable with some intraspecific variation regarding the male reproductive stage per season. Most males are reproductively active during spring/summer and reproductively quiescent during autumn/winter, although some individuals vary (e.g., show testicular spermatogenesis and active sexual segment of the kidneys (SSK) during winter). The SSK could be identified in every male. Most males showed highly hypertrophied SSK in spring/summer and moderately hypertrophied SSK in autumn/winter. The ampulla ductus deferentis was observed and histochemical reactions were conducted. We discuss the probable influence of the unique environmental conditions of the Caatinga region and phylogenetic inertia in the reproductive patterns of this snake species.
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13
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Spermiophagic activity in the female genital system of some species of terrestrial isopods (Crustacea, Halophilosciidae). Tissue Cell 2014; 46:255-9. [DOI: 10.1016/j.tice.2014.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 05/23/2014] [Accepted: 05/23/2014] [Indexed: 11/19/2022]
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14
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Fernandez S, Rodrigues RF, Rici REG, Favaron PO, De Melo APF. Ultrastructure of the bullfrog (Lithobates catesbeianus-Shaw, 1802) oviduct in different seasons. Microsc Res Tech 2013; 76:523-32. [DOI: 10.1002/jemt.22195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 02/01/2013] [Accepted: 02/03/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Sthefanie Fernandez
- Faculty of Veterinary Medicine of Rio Preto; Rua Ivete Gabril Atique; 45, 15025-400; Sao Jose do Rio Preto; Sao Paulo; Brazil
| | - Rosângela Felipe Rodrigues
- School of Veterinary Medicine and Animal Science; University of Sao Paulo; Av. Prof. Dr. Orlando Marques de Paiva, 87; 05508-270; Sao Paulo; Brazil
| | - Rose Eli Grassi Rici
- School of Veterinary Medicine and Animal Science; University of Sao Paulo; Av. Prof. Dr. Orlando Marques de Paiva, 87; 05508-270; Sao Paulo; Brazil
| | - Phelipe Oliveira Favaron
- School of Veterinary Medicine and Animal Science; University of Sao Paulo; Av. Prof. Dr. Orlando Marques de Paiva, 87; 05508-270; Sao Paulo; Brazil
| | - Alan Peres Ferraz De Melo
- School of Veterinary Medicine and Animal Science; University of Sao Paulo; Av. Prof. Dr. Orlando Marques de Paiva, 87; 05508-270; Sao Paulo; Brazil
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15
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Babonis LS, Womack MC, Evans DH. Morphology and putative function of the colon and cloaca of marine and freshwater snakes. J Morphol 2011; 273:88-102. [DOI: 10.1002/jmor.11009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 06/06/2011] [Accepted: 06/24/2011] [Indexed: 11/06/2022]
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17
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Blackburn D, Stewart J. Viviparity and Placentation in Snakes. REPRODUCTIVE BIOLOGY AND PHYLOGENY OF SNAKES 2011. [DOI: 10.1201/b10879-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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18
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Nogueira KDOPC, Rodrigues SS, Araújo VA, Neves CA. Oviductal structure and ultrastructure of the oviparous gecko, Hemidactylus mabouia (Moreau De Jonnès, 1818). Anat Rec (Hoboken) 2011; 294:883-92. [PMID: 21455958 DOI: 10.1002/ar.21375] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 11/11/2010] [Accepted: 11/16/2010] [Indexed: 11/08/2022]
Abstract
Lizards of the family Gekkonidae display a variety of reproductive patterns, as evidenced by the presence of viviparous and oviparous species. The species Hemidactylus mabouia is oviparous. We examined, in vitellogenic females, oviductal structure by light microscopy after routine histological and histochemical techniques, as well as by scanning and transmission electron microscopy. The oviduct is composed of four different regions: the infundibulum, which opens into the coelomic cavity and receives the oocyte released at the time of ovulation; the uterine tube, where sperm storage takes place; the uterus, which is responsible for the eggshell production; and the vagina, the final portion of the oviduct that leads to the cloaca. The oviductal structure of H. mabouia is similar to that of other oviparous lizard species and can be useful for morphological comparative analysis among reptile species.
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Lukoschek V, Avise JC. Genetic Monandry in 6 Viviparous Species of True Sea Snakes. J Hered 2011; 102:347-51. [DOI: 10.1093/jhered/esr017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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20
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Rheubert JL, McMahan CD, Sever DM, Bundy MR, Siegel DS, Gribbins KM. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). VII. spermatozoon morphology and evolutionary trends of sperm characters in snakes. J ZOOL SYST EVOL RES 2010. [DOI: 10.1111/j.1439-0469.2010.00573.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Siegel DS, Sever DM, Rheubert JL, Gribbins KM. Reproductive Biology of Agkistrodon piscivorus Lacépède (Squamata, Serpentes, Viperidae, Crotalinae). HERPETOLOGICAL MONOGRAPHS 2009. [DOI: 10.1655/08-031.1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Sever DM. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). VI. Anterior testicular ducts and their nomenclature. J Morphol 2009; 271:104-15. [DOI: 10.1002/jmor.10784] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Gist DH, Bagwill A, Lance V, Sever DM, Elsey RM. Sperm storage in the oviduct of the American alligator. ACTA ACUST UNITED AC 2008; 309:581-7. [DOI: 10.1002/jez.434] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Siegel DS, Sever DM. Seasonal variation in the oviduct of femaleAgkistrodon piscivorus(Reptilia:Squamata): An ultrastructural investigation. J Morphol 2008; 269:980-97. [DOI: 10.1002/jmor.10638] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Han X, Zhangli L, Li M, Bao H, Hei N, Chen Q. Ultrastructure of anterior uterus of the oviduct and the stored sperm in female soft-shelled turtle, Trionyx sinensis. Anat Rec (Hoboken) 2008; 291:335-51. [PMID: 18231967 DOI: 10.1002/ar.20649] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Ultrastructure of sperm storage in female soft-shelled turtle, Trionyx sinensis was examined under light and electron microscopes. Sperm storage tubules are restricted to the anterior of the uterus. These tubules developed either by folding or fusion of the oviductal mucosal folds and are lined by both ciliated and secretory cells. Ciliated cells are characterized by a few microvilli and prominent cilia in the apical membranes. A prominent feature of the secretory cell is the presence of secretory granules in the supranuclear region. The size, shape, and electron density of these granules vary markedly. The secretory product is released mainly by exocytosis into the oviductal lumen, where it appears as flocculent material. The unique structure in the base of the epithelium, the basal border of the cell -- the basal lamina -- and a blood vessel layer, is presumed to be a important barrier, by which the nourishment exchange and the microenvironment maintenance are ensured. The gland cell is presented with numerous, round, membrane-bound secretory granules of moderate to high electron densities. We divide these granules into three types according to their appearance: (1) membrane bounded granules with high-homogeneous electron density, (2) membrane bounded granules with moderate-homogeneous electron density, (3) membrane bounded, electron dense granules with concentric structures. These granules are presented as different stages of the secretions in the gland cell. The junction complexes are markedly distributed between cells, which are important in keeping stability and the microenvironment maintenance of the sperm storage tubules. Sperm stored in the tubules are heterogeneous in cytology. In addition to the mature sperm in the lumen, sperm with large chromatic granules are found, which are presumed to be immature sperm and are being in the process of nuclear condensation. Several spermatozoa in the tubules are exhibited with definitive indications of degeneration of the nuclei. The nuclear volume increases. The electron density of the central cores in mitochondria declines, combined with the deterioration of concentric membrane structure. Those changes are possibly due to the long time storage of the sperm in sperm storage tubules, and the leakage of reactive oxygen species is suggested to be a major cause. We conclude that the ultrastructure character of sperm storage in the oviduct of Trionyx sinensis is unique, in addition to having a basal function in secretion and the cilia swing, the tubules also provide an available microenvironment for the sperm to long time stored. The degenerative sperm in the tubules might be related to paternity-specific reproductive adaptations, and the sperm competition might occur during long time storage.
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Affiliation(s)
- Xiangkun Han
- College of Veterinary Medicine of Nanjing Agricultural University, Nanjing, PR China
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Siegel DS, Sever DM. Sperm aggregations in femaleAgkistrodon piscivorus (Reptilia:Squamata): A histological and ultrastructural investigation. J Morphol 2008; 269:189-206. [DOI: 10.1002/jmor.10588] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Xiangkun H, Li Z, Meiying L, Huijun B, Nainan H, Qiusheng C. Seasonal changes of sperm storage and correlative structures in male and female soft-shelled turtles, Trionyx sinensis. Anim Reprod Sci 2007; 108:435-45. [PMID: 17997057 DOI: 10.1016/j.anireprosci.2007.09.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2006] [Revised: 09/17/2007] [Accepted: 09/28/2007] [Indexed: 11/30/2022]
Abstract
Reproductive ducts of male and female soft-shelled turtles, Trionyx sinensis were examined throughout the year (March, May, September, December) using brightfield and electron microscopes (TEM and SEM), to determine the location and histomorphological characteristics of sperm storage structures as well as their changes at different phases of the seasonal reproductive cycle. Sperm stored in the epididymis were also examined. In the male, spermatogenesis is initiated in spring (May), and then the mature sperm are released in autumn as an episodic event. Spermatogenesis is inactive in winter. However, in this species, the epididymis contains sperm throughout the entire year. Sperm observed in the epididymis are intact and some structures are uniquely different from other reptiles, and is characterized by 35-40 concentric mitochondria with a dense core in the centre. Many glycogen granules are observed in the cytoplasm of the midpiece. However, the epithelial cell type of epididymal duct change in different seasons. The cells are fully developed with a highly secretory activity in September. The materials secreted from the epithelium might have the function as nourishment for the stored sperm. Sperm storage structures in the form of tubules are observed in the wall of the isthmus of the oviduct in hibernating females but are absent in the groups of May and September. These tubules develop either by folding or fusion of the oviductal mucosal folds and are lined by both ciliated and secretory cells. These tubules might provide a microenvironment for the sperm to enable its long-term storage. After being separated 4 months (December-March) from the male, sperm are observed in the tubules of the isthmus of the oviduct. The unique character of the sperm combined with the special sperm storage structures enable the sperm to maintain fertility and activity during their storage.
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Affiliation(s)
- Han Xiangkun
- College of Veterinary Medicine of Nanjing Agricultural University, Nanjing 210095, PR China
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Sánchez-Martínez PM, Ramírez-Pinilla MP, Miranda-Esquivel DR. Comparative histology of the vaginal-cloacal region in Squamata and its phylogenetic implications. ACTA ZOOL-STOCKHOLM 2007. [DOI: 10.1111/j.1463-6395.2007.00282.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Adams SM, Biazik J, Stewart RL, Murphy CR, Thompson MB. Fundamentals of viviparity: Comparison of seasonal changes in the uterine epithelium of oviparous and viviparousLerista bougainvillii (Squamata: Scincidae). J Morphol 2007; 268:624-35. [PMID: 17458887 DOI: 10.1002/jmor.10522] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Distinct differences in epithelial response between oviparous and viviparous species of skinks led us to investigate morphological differences in the uterus of a species that exhibits bi-modal reproduction and that may indicate specialities for the different requirements of viviparity and oviparity. The uteri of females from oviparous and viviparous populations of the Australian scincid lizard, Lerista bougainvillii, are described in detail to determine whether the occurrence of uterodomes and the plasma membrane transformation, found in other viviparous species but not oviparous species, are indeed features characteristic of viviparity. Oviductal tissue was dissected at three different stages of reproduction from lizards from both populations: 1) vitellogenic, 2) gravid or pregnant, and 3) non-reproductive or quiescent. Tissue was observed using both scanning and transmission electron microscopy. Lerista bougainvillii has a simple placental morphology with simple squamous epithelium. In contrast to mammals and other viviparous skinks, L. bougainvillii does not undergo a plasma membrane transformation, but early signs of placentation in viviparous individuals are indicated by changes in the uterine surface that occur largely after embryonic stage 30. There are no obvious cellular differences between the uteri of oviparous and viviparous L. bougainvillii at the non-reproductive and vitellogenic phase of the reproductive cycle but throughout gestation/gravidity, the cellular differences that could be related to the changing functional requirements with the retention of the viviparous embryo, became apparent. A plasma membrane transformation with ensuing uterodome formation does not occur, which suggests that these more sophisticated changes are a feature of advanced placental development in reptiles.
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Affiliation(s)
- Susan M Adams
- School of Biological Sciences and Wildlife Research Institute, The University of Sydney, Sydney, New South Wales 2006, Australia.
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Gribbins KM, Happ CS, Sever DM. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). V. The temporal germ cell development strategy of the testis. ACTA ZOOL-STOCKHOLM 2005. [DOI: 10.1111/j.1463-6395.2005.00201.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Winne CT, Dorcas ME, Poppy SM. Population Structure, Body Size, and Seasonal Activity of Black Swamp Snakes (Seminatrix pygaea). SOUTHEAST NAT 2005. [DOI: 10.1656/1528-7092(2005)004[0001:psbsas]2.0.co;2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Sever DM. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). IV. Occurrence of an ampulla ductus deferentis. J Morphol 2004; 262:714-30. [PMID: 15487021 DOI: 10.1002/jmor.10272] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The distal end of the ductus deferens of Seminatrix pygaea (Cope) differs from more proximal portions of the tube by possessing a highly fluctuated epithelium. Similar morphology has been reported in this area in one lizard and some mammals and the region has been designated in these taxa as the ampulla ductus deferentis. In this study, light and transmission electron microscopy were used to study the posterior ductus deferens in S. pygaea and compare the histology in this region to more proximal regions of the duct and to descriptions of the ampulla of other species. Seminatrix pygaea stores sperm throughout the ductus deferens during the entire year. The epithelium of the ductus deferens is not secretory, but the presence of numerous small apical vesicles indicates a role in fluid absorption. In addition to the highly folded epithelium, clusters of sperm nuclei are more intimately associated with the apical ampullary epithelium than elsewhere in the ductus deferens. No evidence of phagocytosis of sperm was found. In contrast, the ampulla of mammals and presumably the lizard Calotes versicolor is glandular and phagocytic. The common character shared by the squamates and mammals with specializations in this area is the folded epithelium, and whether this is due to shared ancestry with amniotes or is homoplastic is unresolved.
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Affiliation(s)
- David M Sever
- Department of Biological Sciences, Southeastern Louisiana University, Hammond, Louisiana.
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Ferreira A, Dolder H. Cytochemical study of spermiogenesis and mature spermatozoa in the lizard Tropidurus itambere (Reptilia, Squamata). Acta Histochem 2004; 105:339-52. [PMID: 14656007 DOI: 10.1078/0065-1281-00731] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The present study was undertaken to detect essential components of spermatozoa by ultrastructural and cytochemical analyses of testis and epididymis of the lizard Tropidurus itambere at different points of its annual reproductive cycle. Cytochemical investigations of spermiogenesis have not been performed so far in Squamata and are scarce for lower vertebrates. Essential components are: 1) polysaccharides, identified by PAS staining, abundantly present in Sertoli cell elongations, acrosomal vesicles and the acrosome of sperm cells; 2) glycoconjugate variations, labeled by different lectins and used to investigate cell modifications during spermiogenesis and found in mature spermatozoa in the female's seminal receptacle; 3) basic proteins, present in large quantities in spermatozoa in the subacrosomal cone, the pericentriolar material, the midpiece dense bodies, the peripheral fibers of the axoneme, and the fibrous sheath of the flagellum; 4) the final reaction product of acid phosphatase activity in several stages of acrosome development, specifically in the clear zone and epinuclear electron-lucent region of spermatozoal acrosomes, as well as in very active lysosomes found during the quiescent period of the reproductive cycle; 5) lipids, abundantly present in the cytoplasm of Leydig cells during the quiescent period. The cytochemical methods show that the ultrastructurally complex acrosome is also biochemically heterogeneous, with specific layers rich in glycoproteins, basic proteins or acid phosphatase. These different components may play a role during sperm penetration into the ovule. Basic proteins are largely responsible for structures surrounding the axoneme to provide resistance to the flagellum. In the quiescent period, acid phosphatase activity is involved in the elimination of superfluous sperm cells, whereas lipids in Leydig cells are used for hormone synthesis which starts at this time point to initiate a new reproductive cycle. Variations in lectin staining revealing glycoconjugates show that spermatozoa undergo post-testicular maturation up to their storage in the female.
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Affiliation(s)
- Adelina Ferreira
- Department of Cell Biology, Campinas State University (UNICAMP), São Paulo, Brazil
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Sever DM, Hopkins WA. Oviductal sperm storage in the ground skinkScincella laterale holbrook (Reptilia: Scincidae). ACTA ACUST UNITED AC 2004; 301:599-611. [PMID: 15229870 DOI: 10.1002/jez.a.52] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The reproductive tracts of female ground skinks, Scincella laterale, collected at various times throughout their reproductive cycle were examined by light and transmission electron microscopy. Examination of the tracts revealed that sperm are retained in the posterior vagina after mating but prior to the ovulation of oocytes. The sperm are not sequestered in specialized glands but occur in scattered clusters in the lumen or among the deep, narrow rugae. The simple columnar lining of the vagina consists mostly of ciliated cells interspersed with occasional secretory cells. After ovulation, as indicated by the presence of eggs in the uterus, sperm are not found in the vagina. No sperm or sperm storage tubules occur in the infundibulum, the characteristic location for sperm storage in scleroglossid squamates that have been studied. Our results are a further indication that too few species have been examined to construct a rigorous phylogenetic hypothesis about the occurrence of sperm storage tubules in lizards.
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Affiliation(s)
- David M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana, USA.
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Long EL, Sonstegard TS, Long JA, Van Tassell CP, Zuelke KA. Serial analysis of gene expression in turkey sperm storage tubules in the presence and absence of resident sperm. Biol Reprod 2003; 69:469-74. [PMID: 12672662 DOI: 10.1095/biolreprod.102.015172] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Turkey sperm lose viability within 8-18 h when stored as liquid semen using current methods and extenders. In contrast, turkey hens maintain viable, fertile sperm in their sperm storage tubules (SST) for 45 or more days following a single insemination. Our long-term objectives are to identify and characterize differentially expressed genes that may underlie this prolonged sperm storage and then use this information to develop improved methods for storing liquid turkey semen. We employed serial analysis of gene expression (SAGE) to compare gene expression patterns in turkey SST recovered from hens after artificial insemination (AI) with extended semen (sperm AI) or extender alone (control AI). We constructed two separate SAGE libraries with SST RNA obtained from sperm and control AI hens. We used these libraries to generate 95,325 ten-base pair SAGE tags. These 95,325 tags represented 27,430 unique genes. The sperm and control AI libraries contained 47,663 and 47,662 tags representing 18,030 and 19,101 putative unique transcripts, respectively. Approximately 1% of these putative unique genes were differentially expressed (P<0.05) between treatments. Tentative annotations were ascribed to the SAGE tag nucleotide sequences by comparing them against publicly available SAGE tag and cDNA sequence databases. Based on its SAGE tag nucleotide sequence, we cloned a partial turkey avidin cDNA and confirmed its up-regulation in the sperm AI SST. The bioinformatics and experimental procedures employed to clone turkey avidin and confirm its differential expression represent a useful paradigm for analyzing SAGE tag data from relatively uncharacterized model systems.
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Affiliation(s)
- Ezhou L Long
- Biotechnology and Germplasm Laboratory, Animal and Natural Resources Institute, USDA-ARS, Beltsville, Maryland 20705, USA
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36
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Sever DM, Stevens RA, Ryan TJ, Hamlett WC. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). III. Sexual segment of the male kidney. J Morphol 2002; 252:238-54. [PMID: 11948672 DOI: 10.1002/jmor.1102] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In mature male snakes and lizards, a distal portion of the nephron is hypertrophied in relation to its appearance in females and immature males. This sexual segment of the male kidney apparently provides seminal fluid that is mixed with sperm and released into the female cloaca during copulation. In this article, we provide the first study at the ultrastructural level of seasonal variation in the sexual segment of the kidney of a squamate, the natricine snake Seminatrix pygaea. Previous workers have indicated that the sexual segment is secretory only when the testes are spermatogenically active. The sexual segment of the kidney in S. pygaea does not go through an extended period of inactivity but does show a cycle of synthesis and secretion that can be related to the spermatogenic cycle and mating activity. We show that synthesis of secretory product is initiated with the onset of spermatogenic activity in the spring and culminates with completion of spermiation in the fall. Secretion of the product, however, occurs in a premating period in March when the testes are inactive. Secretion during this premating period is probably necessary to provide time for the passage of the products down the ureter in order to mix with sperm during mating later in spring.
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Affiliation(s)
- David M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA.
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37
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Abstract
The three orders of extant amphibians are Gymnophiona, Anura, and Urodela. Although all gymnophionans apparently have internal fertilization and many are viviparous, female sperm storage is unknown. Internal fertilization has convergently evolved in a few anurans, but females of just one species, Ascaphus truei, are known to possess oviductal sperm storage tubules (SSTs). The SSTs of A. truei are similar anatomically to such glands in squamate reptiles. This similarity is convergence due to similar functional adaptations and/or internal design constraints. In salamanders and newts (Urodela), absence of sperm storage in females is the ancestral condition (three families). In the derived condition, sperm storage occurs in cloacal glands called spermathecae, and their possession is a synapomorphy for females in the suborder Salamandroidea (seven families). Salamandroids are the only vertebrates with cloacal sperm storage glands. In this paper, a phenetic analysis of variation in spermathecal characters reveals patterns of convergence in certain spermathecal characters in unrelated taxa that breed in similar habitats. In the family Salamandridae, a role in sperm nutrition for the spermathecal epithelium is questioned, and the widespread occurrence of spermiophagy is related to other reproductive strategies. I propose how the packaging of sperm in structurally different types of spermathecae may influence male paternity.
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Affiliation(s)
- David M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA
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38
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Sever DM, Hamlett WC. Female sperm storage in reptiles. THE JOURNAL OF EXPERIMENTAL ZOOLOGY 2002; 292:187-99. [PMID: 11754034 DOI: 10.1002/jez.1154] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Internal fertilization and oviparity most likely are symplesiomorphies for modern reptiles, and viviparity has evolved independently numerous times in Sauria and Serpentes. Oviducal sperm storage is known in females of all taxa except Amphisbaenia. However, in Rhynchocephalia and Crocodilia, sperm storage is poorly studied, and specialized sperm storage tubules (Ssts) are unknown. We use the molecular phylogenetic hypothesis [(Chelonia+Archosauria) (Squamata)] to trace evolution of sperm storage characters. Ssts arose independently in Chelonia and Squamata. Turtles possess albumen-secreting glands in the anterior half of the oviduct (the tuba or isthmus), and the most distal of these glands also serve as Ssts; in addition, some turtles possess Ssts in the adjacent segment of the oviduct, the uterus. Squamates lack albumen-secreting glands, and the ancestral state is possession of Ssts in the posterior infundibulum (uterine tube). Secondarily, iguanids have evolved vaginal Ssts. In this paper, we present the first ultrastructural observations on vaginal Ssts in lizards, using Anolis sagrei (Polychrotidae). Proximally, the neck of these simple tubular glands continues the alternation of ciliated and secretory cells lining the lumen of the vagina. However, the epithelial cells of the distal sperm storage area are neither secretory nor ciliated. The Ssts of Anolis are more similar to those of birds more than to infundibular receptacles in snakes and lizards.
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Affiliation(s)
- David M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA.
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Sever DM, Moriarty EC, Rania LC, Hamlett WC. Sperm storage in the oviduct of the internal fertilizing frog Ascaphus truei. J Morphol 2001; 248:1-21. [PMID: 11268055 DOI: 10.1002/jmor.1017] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study provides the first descriptions of sperm storage at the tissue and cellular levels in a female frog or toad. Oviducal anatomy was studied by light and electron microscopy in Ascaphus truei from north coastal California. Ascaphus truei is one of the few species of anurans in which fertilization is internal. Unlike other anurans with internal fertilization, however, mating in A. truei consists of a unique combination of amplectic and copulatory mechanisms that we term "copulexus." Posterior to a short, aglandular infundibular region, the oviduct possesses: 1) a proximal, convoluted ampullary region where intrinsic tubular glands secrete gelatinous envelopes around eggs; 2) a middle ovisac region where fertilization occurs; and 3) a distal oviducal sinus formed by medial junction of the ovisacs. Sperm storage tubules (SSTs) occur in the anterior portions of the ovisacs and consist of simple tubular glands. SSTs and the rest of the oviducal lining stain positively with the periodic acid-Schiff's procedure for neutral carbohydrates and this reaction is especially intense in reproductively active females. Sperm were found in the SSTs of gravid females as well as some nonvitellogenic females. The sperm are in orderly bundles in the SSTs, and although occasionally sperm nuclei were embedded in the epithelium, no evidence for spermiophagy was found. Oviducal sperm storage in A. truei is homoplastic, with closest structural similarities to squamate reptiles. Oviduct/sperm design constraints appear to limit the options for expression of features associated with oviducal sperm storage.
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Affiliation(s)
- D M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA.
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Sever DM, Ryan TJ, Morris T, Patton D, Swafford S. Ultrastructure of the reproductive system of the black swamp snake (Seminatrix pygaea). II. Annual oviducal cycle. J Morphol 2000; 245:146-60. [PMID: 10906748 DOI: 10.1002/1097-4687(200008)245:2<146::aid-jmor5>3.0.co;2-f] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This article is the first ultrastructural study on the annual oviducal cycle in a snake. The ultrastructure of the oviduct was studied in 21 females of the viviparous natricine snake Seminatrix pygaea. Specimens were collected and sacrificed in March, May, June, July, and October from one locale in South Carolina during 1998-1999. The sample included individuals: 1) in an inactive reproductive condition, 2) mated but prior to ovulation, and 3) from early and late periods of gravidity. The oviduct possesses four distinct regions from cranial to caudal: the anterior infundibulum, the posterior infundibulum containing sperm storage tubules (SSTs), the uterus, and the vagina. The epithelium is simple throughout the oviduct and invaginations of the lining form tubular glands in all regions except the anterior infundibulum and the posterior vagina. The tubular glands are not alveolar, as reported in some other snakes, and simply represent a continuation of the oviducal lining with no additional specializations. The anterior infundibulum and vagina show the least amount of variation in relation to season or reproductive condition. In these regions, the epithelium is irregular, varying from squamous to columnar, and cells with elongate cilia alternate with secretory cells. The secretory product of the infundibulum consists largely of lipids, whereas a glycoprotein predominates in the vagina; however, both products are found in these regions and elsewhere in the oviduct. In the SST area and the anterior vagina, tubular glands are compound as well as simple. The epithelium of the SST is most active after mating, and glycoprotein vacuoles and lipid droplets are equally abundant. When present, sperm form tangled masses in the oviducal lumen and glands of the SST area. The glands of the uterus are always simple. During sperm migration, a carrier matrix composed of sloughed epithelial cells, a glycoprotein colloid, lipids, and membranous structures surround sperm in the posterior uterus. During gravidity, tubular glands, cilia, and secretory products diminish with increasing development of the fetus, and numerous capillaries abut the basal lamina of the attenuated epithelial lining of the uterus.
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Affiliation(s)
- D M Sever
- Department of Biology, Saint Mary's College, Notre Dame, Indiana 46556, USA.
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