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Dissection of Larval Zebrafish Gonadal Tissue
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Segregating variation for temperature-dependent sex determination in a lizard.

T Rhen1, A Schroeder, J T Sakata

  • 1Section of Integrative Biology, University of Texas at Austin, Austin, TX, USA. turk.rhen@und.nodak.edu

Heredity
|August 12, 2010
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Summary

This study reveals genetic variation in temperature-dependent sex determination (TSD) in leopard geckos. This finding demonstrates that TSD inheritance patterns can be analyzed genetically in reptiles.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Reproductive Biology

Background:

  • Temperature-dependent sex determination (TSD) is observed in numerous reptile species, including turtles and crocodilians.
  • While estrogen signaling is known to be crucial for ovary development in TSD species, the precise mechanism translating temperature into sex determination remains unknown.
  • Identifying the genetic basis of TSD is contingent upon the presence of segregating genetic variation for this trait.

Purpose of the Study:

  • To investigate the inheritance patterns of sexual phenotype in a reptile exhibiting TSD.
  • To determine if genetic variance and genotype-by-temperature interactions influence sex determination in leopard geckos.
  • To assess the feasibility of using genetic analysis to identify the genes responsible for TSD.

Main Methods:

  • Analysis of a 13-generation pedigree of captive leopard geckos (Eublepharis macularius).
  • Examination of sexual phenotype inheritance under controlled temperatures (30°C and 32.5°C).
  • Statistical analysis to quantify additive genetic variation, dominance variance, and maternal effects.

Main Results:

  • Significant additive genetic variation for sex determination was detected at 30°C (female-biased sex ratio).
  • Significant dominance variance was observed at 32.5°C (male-biased sex ratio).
  • Non-genetic maternal effects were found to be negligible compared to genetic factors and temperature.

Conclusions:

  • This study provides the first direct evidence of segregating genetic variation for TSD in a reptile.
  • The identified genetic variance and genotype-by-temperature interactions validate the use of quantitative trait locus analysis for pinpointing TSD genes in leopard geckos.
  • These findings open avenues for future research into the molecular mechanisms underlying TSD.