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Trihybrid Crosses02:27

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...

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Transcriptome and methylome interactions in rice hybrids.

Ramakrishna K Chodavarapu1, Suhua Feng, Bo Ding

  • 1Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA 90095, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 11, 2012
PubMed
Summary
This summary is machine-generated.

Epigenetic marks, or DNA methylation, show variable inheritance in rice. Epimutations, often clustered, influence gene expression and may explain expression level misinheritance in hybrids.

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Area of Science:

  • Plant genetics
  • Epigenetics
  • Genomics

Background:

  • DNA methylation is a heritable epigenetic mark regulating gene expression.
  • Environmental stresses can alter DNA methylation patterns.
  • Epigenetic inheritance may play a role in plant heterosis.

Purpose of the Study:

  • To investigate the heritability of DNA methylation in rice.
  • To understand how DNA methylation influences and is affected by transcription.
  • To analyze genome-wide methylation patterns in rice parents and hybrids.

Main Methods:

  • Genome-wide analysis using bisulfite-sequencing, RNA-sequencing, and siRNA-sequencing.
  • Integration of genetic (SNP) and epigenetic (methylation) data.
  • Reconstruction of parental chromosomes in hybrid offspring.

Main Results:

  • Epigenetic heritability is highly variable, with significant epimutations between parental strains and in hybrids.
  • Epimutations are often clustered and associated with differential small interfering RNA (siRNA) production.
  • Allele-specific expression patterns were inherited, but differential expression in hybrids was linked to epimutations and trans effects.

Conclusions:

  • Epimutations contribute significantly to the misinheritance of gene expression levels in rice hybrids.
  • Clustered epimutations and trans effects are key factors influencing gene expression variability.
  • Understanding epigenetic inheritance is crucial for plant breeding and understanding hybrid vigor.