Steroid signaling and temperature-dependent sex determination - Reviewing the evidence for early action of estrogen during ovarian determination in turtles

被引:83
作者
Ramsey, Mary [1 ]
Crews, David [1 ]
机构
[1] Univ Texas Austin, Sect Integrat Biol, Austin, TX 78712 USA
关键词
Temperature-dependent sex determination; Trachemys scripta; Estrogen; Aromatase; Ovary; EARED SLIDER TURTLE; SEXUALLY DIMORPHIC EXPRESSION; APALONE-MUTICA TURTLES; ADRENAL-KIDNEY-GONAD; ALPHA ER-ALPHA; TRACHEMYS-SCRIPTA; GENE-EXPRESSION; RECEPTOR-BETA; AROMATASE EXPRESSION; FACTOR-I;
D O I
10.1016/j.semcdb.2008.10.004
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The developmental processes underlying gonadal differentiation are conserved across vertebrates, but the triggers initiating these trajectories are extremely variable. The red-eared slider turtle (Trachemys scripta elegans) exhibits temperature-dependent sex determination (TSD), a system where incubation temperature during a temperature-sensitive period of development determines offspring sex. However, gonadal sex is sensitive to both temperature and hormones during this period-particularly estrogen. We present a model for temperature-based differences in aromatase expression as a critical step in ovarian determination. Localized estrogen production facilitates ovarian development while inhibiting male-specific gene expression. At male-producing temperatures aromatase is not upregulated, thereby allowing testis development. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:283 / 292
页数:10
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