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Related Experiment Video

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High-Throughput Robotically Assisted Isolation of Temperature-sensitive Lethal Mutants in Chlamydomonas reinhardtii

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Multi-locus Genotypes Underlying Temperature Sensitivity in a Mutationally Induced Trait.

Jonathan T Lee¹, Matthew B Taylor¹, Amy Shen¹

¹Molecular and Computational Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, California, United States of America.

|March 19, 2016

Summary

Understanding genotype-by-environment interaction (GxE) is key. This study reveals how combinations of alleles at multiple genetic loci collectively influence temperature sensitivity in yeast, offering new insights into GxE mechanisms.

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Area of Science:

Genetics
Evolutionary Biology
Systems Biology

Background:

Genotype-by-environment interaction (GxE) explains how genetic differences cause varied phenotypic responses to environmental changes.
Understanding GxE is crucial for agriculture, evolution, and medicine.
Previous studies focused on individual genetic loci, but collective effects of multiple loci on GxE are less understood.

Purpose of the Study:

To identify multi-locus genotypes that control a mutationally induced colony phenotype across different temperatures.
To characterize how combinations of alleles at seven loci collectively influence genotype-by-environment interaction (GxE).
To elucidate the distinct roles of different alleles in modulating temperature sensitivity.

Main Methods:

Analysis of a yeast recombinant panel to study a mutationally induced colony phenotype.
Examination of trait expression across three temperatures (21, 30, and 37 °C).
Identification and comparison of predominant multi-locus genotypes.

Main Results:

Five predominant multi-locus genotypes were identified, each showing varying degrees of temperature sensitivity.
Alleles of the transcription factor MSS11 determined the temperature range for trait expression.
Alleles at other loci modified temperature sensitivity in a manner dependent on genetic background and temperature.

Conclusions:

This study provides one of the first characterizations of GxE at the multi-locus genotype level.
Demonstrates that different alleles play distinct roles in modulating GxE.
Offers a detailed example of how sets of genetic variants collectively shape trait expression across environmental conditions.