Seasonal variation in plasma and corpus luteum oestradiol-17β and progesterone concentrations of the lizard<i>Cordylus p. polyzonus</i>(Sauria: Cordylidae)

Flemming, Alexander F.

doi:10.1080/02541858.1994.11448332

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Plasma E 2 and P 4 concentrations follow the typical patterndE 2 is highest during vitellogenesis and P 4 is highest during gestation; plasma T also was measured but not detected in this study (van Wyk, 1994). In females, plasma E 2 and P 4 values are similar to those reported for C. giganteus above (Flemming, 1994). In males, testicular recrudescence is initiated in the fall and is maximal in the spring, when mating commences; plasma T as well as AND concentrations exhibit a bimodal profile, peaking at the onset of recrudescence and then again in the spring during maximal recrudescence and mating (Flemming, 1993).…”

Section: Cordylidaesupporting

confidence: 80%

Hormones and Reproductive Cycles in Lizards

Lovern

2011

Hormones and Reproduction of Vertebrates

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Section: Cordylidaesupporting

confidence: 80%

Hormones and Reproductive Cycles in Lizards

Lovern

2011

Hormones and Reproduction of Vertebrates

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“…Patterns of plasma progesterone concentrations associated with gestation vary widely among species of viviparous squamate (Jones and Baxter, 1991), with peaks occurring from periovulation (Girling et al, 2002), through mid (Bonnet et al, 2001;Edwards and Jones, 2001;Flemming, 1994;Kleis-San Francisco and Callard, 1986) to late gestation (Jones and Swain, 1996;Jones et al, 1997). In the red-sided garter snake (Thamnophis sirtalis parietalis), progesterone concen-trations remained low or non-detectable throughout gestation (Whittier et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

“…The corpora lutea are believed to be the major source of progesterone in viviparous squamates (Callard et al, 1992;Xavier, 1987) and in the few species examined, patterns of plasma progesterone usually correlate with the activity of the corpora lutea (Bennett and Jones, 2002;Fergusson and Bradshaw, 1991;Flemming, 1994). In some species, however, plasma progesterone concentrations remain high even after regression of the corpora lutea (Sceloporus jarrovi, Guillette et al, 1981;General and Comparative Endocrinology 133 (2003)…”

Section: Introductionmentioning

confidence: 99%

In vitro progesterone production by maternal and embryonic tissues during gestation in the southern snow skink (Niveoscincus microlepidotus)

Girling

Jones

2003

General and Comparative Endocrinology

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A review of the evolution of viviparity in squamate reptiles: the past, present and future role of molecular biology and genomics

Murphy

Thompson

2011

J Comp Physiol B

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Squamate reptiles (lizards and snakes) offer a unique model system for testing hypotheses about the evolutionary transition from oviparity (egg-laying) to viviparity (live-bearing) in amniote vertebrates. The evolution of squamate viviparity has occurred remarkably frequently (>108 times) and has resulted in major changes in reproductive physiology. Such frequent changes in reproductive strategy pose two questions: (1) what are the molecular mechanisms responsible for the evolution of squamate viviparity? (2) Are these molecular mechanisms the same for separate origins of viviparity? Molecular approaches, such as RT-PCR, in situ hybridisation, Western blotting and immunofluorescence, have been invaluable for identifying genes and proteins that are involved in squamate placental development, materno-foetal immunotolerance, placental transport, placental angiogenesis, hormone synthesis and hormone receptor expression. However, the candidate-gene or -protein approach that has been used until now does not allow for de novo gene/protein discovery; results to date suggest that the reproductive physiologies of mammals and squamate reptiles are very similar, but this conclusion may simply be due to a limited capacity to study the subset of genes and proteins that are unique to reptiles. Progress has also been slowed by the lack of appropriate molecular and genomic resources for squamate reptiles. The advent of next-generation sequencing provides a relatively inexpensive way to conduct rapid high-throughput sequencing of genomes and transcriptomes. We discuss the potential use of next-generation sequencing technologies to analyse differences in gene expression between oviparous and viviparous squamates, provide important sequence information for reptiles, and generate testable hypotheses for the evolution of viviparity.

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Seasonal variation in plasma and corpus luteum oestradiol-17β and progesterone concentrations of the lizardCordylus p. polyzonus(Sauria: Cordylidae)

Cited by 6 publications

References 21 publications

Hormones and Reproductive Cycles in Lizards

Hormones and Reproductive Cycles in Lizards

In vitro progesterone production by maternal and embryonic tissues during gestation in the southern snow skink (Niveoscincus microlepidotus)

A review of the evolution of viviparity in squamate reptiles: the past, present and future role of molecular biology and genomics

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