Abstract:
:Maternally derived yolk steroids have been found to elicit both short-term and long-term effects on offspring phenotype. Paradoxically, their effects can be strikingly specific given the often substantial concentrations present at oviposition, and they do not appear to uniformly affect all steroid-sensitive processes. To better understand the dynamics of yolk steroids across embryonic development, we quantified levels of progesterone, testosterone, and estradiol at 5-day intervals throughout development in eggs of the red-eared slider turtle (Trachemys scripta) incubated at both male- and female-producing temperatures. We also assessed the effect of season on yolk steroid levels. For all steroids assayed, the concentrations in yolk declined significantly by day 15 of embryonic development despite large differences in initial concentrations among steroids. We found that estradiol was the only steroid whose initial concentration varied significantly with season, while only the decline in testosterone was affected by incubation temperature. These findings illustrate the complex nature of yolk steroid dynamics and suggest that maternal steroids may be rapidly degraded or subject to embryonic processing, emphasizing the need for studies aimed at understanding the mechanisms through which yolk steroids may elicit their effects.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Paitz RT,Bowden RMdoi
10.1016/j.ygcen.2009.01.018subject
Has Abstractpub_date
2009-04-01 00:00:00pages
246-51issue
2eissn
0016-6480issn
1095-6840pii
S0016-6480(09)00038-0journal_volume
161pub_type
杂志文章abstract::The fushi tarazu factor 1 (FTZ-F1) gene family constitutes a subgroup of orphan nuclear receptors which can be divided into two groups (LRH/FTF- and SF-1/Ad4BP-like) based on sequence homology, function, and tissue distribution. Analysis of zebrafish FTZ-F1 homologues (zFF1 and ff1b) during embryogenesis indicated dis...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90315-6
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1998.7236
更新日期:1999-04-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2011.11.005
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journal_title:General and comparative endocrinology
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更新日期:2016-04-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.2001.7628
更新日期:2001-06-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2017.12.006
更新日期:2018-04-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1995.1015
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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更新日期:2017-12-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(90)90033-i
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2012.09.013
更新日期:2012-12-01 00:00:00
abstract::Plasma levels of corticosterone and aldosterone were determined by radioimmunoassay in ducks consuming diets containing different concentrations of sodium and potassium. Compared with control diet birds, maintenance on a high-Na+ diet for 5 days caused a 2-fold increase in the basal plasma corticosterone concentration...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90131-5
更新日期:1985-04-01 00:00:00
abstract::Intraperitoneal injection of CaCl2 in intact, sham-stanniectomized, and stanniectomized American eels, Anguilla rostrata (LeSueur), resulted in a rapid elevation of plasma calcium level which was more marked and of longer duration in the stanniectomized eels. The same treatment reduced whole body calcium influx (JinCa...
journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2007.12.010
更新日期:2008-04-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(85)90196-0
更新日期:1985-01-01 00:00:00
abstract::Plasma aldosterone levels of Bufo japonicus formosus captured in their natural environment were determined each month throughout 1 year by radioimmunoassay. Low values were recorded in winter and spring, and the maximum occurred in July or August. High summer levels of aldosterone and increases in live weight were cor...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(84)90237-5
更新日期:1984-01-01 00:00:00
abstract::Two peptides with sequence similarities to growth hormone releasing hormone (GHRH) have been identified by analysis of the chicken genome. One of these peptides, chicken (c) GHRH-LP (like peptide) was previously found to poorly bind to chicken pituitary membranes or to cloned and expressed chicken GHRH receptors and h...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2014.06.007
更新日期:2014-08-01 00:00:00