Plant genetics: Increased outcrossing in hothead mutants

@article{Peng2006PlantGI,
  title={Plant genetics: Increased outcrossing in hothead mutants},
  author={Peng Peng and Simon W.-L. Chan and Govind A. Shah and Steven E. Jacobsen},
  journal={Nature},
  year={2006},
  volume={443},
  pages={E8-E8}
}
Arising from: S. J. Lolle, J. L. Victor, J. M. Young & R. E. Pruitt 434, 505–509 (2005); Lolle et al. replyLolle et al. report that loss-of-function alleles of the HOTHEAD (HTH) gene in Arabidopsis thaliana are genetically unstable, giving rise to wild-type revertants. On the basis of the reversion of many other genetic markers in hth plants, they suggested a model in which a cache of extragenomic information could cause genes to revert to the genotype of previous generations. In our attempts… 
Increased outcrossing in hothead mutants (Reply)
TLDR
The results obtained by Peng et al. are consistent with an increased amount of outcrossing in hth mutants of Arabidopsis thaliana and would be difficult to explain by any other mechanism.
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genetic variation revealed in somatic sectors of De novo single Arabidopsis plants
TLDR
It is hypothesized that organisms that primarily self-fertilize or propagate clonally counteract the genetic cost of such reproductive strategies by leveraging a cryptic reserve of extra-genomic information.
genetic variation revealed in somatic sectors of single De novo Arabidopsis plants
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TLDR
This work shows that Arabidopsis plants homozygous for recessive mutant alleles of the organ fusion gene HOTHEAD can inherit allele-specific DNA sequence information that was not present in the chromosomal genome of their parents but was present in previous generations, and postulates that these genetic restoration events are the result of a template-directed process that makes use of an ancestral RNA-sequence cache.
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TLDR
The molecular cloning and characterization of HOTHEAD (HTH), a gene required to limit cellular interactions between contacting epidermal cells during floral development, is described and sequence data unequivocally show that none of the alleles isolated are epigenetic alleles as suggested by genetic behavior previously observed at this locus.
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