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The B73 Maize Genome: Complexity, Diversity, and Dynamics
TLDR
The sequence of the maize genome reveals it to be the most complex genome known to date and the correlation of methylation-poor regions with Mu transposon insertions and recombination and how uneven gene losses between duplicated regions were involved in returning an ancient allotetraploid to a genetically diploid state is reported.
Regulation of Heterochromatic Silencing and Histone H3 Lysine-9 Methylation by RNAi
TLDR
It is proposed that double-stranded RNA arising from centromeric repeats targets formation and maintenance of heterochromatin through RNAi.
Asymmetric leaves1 mediates leaf patterning and stem cell function in Arabidopsis
TLDR
This genetic pathway defines a mechanism for differentiating between stem cells and organ founder cells within the shoot apical meristem and demonstrates that genes expressed in organ primordia interact with meristenatic genes to regulate shoot morphogenesis.
Criteria for Annotation of Plant MicroRNAs
TLDR
The specific criteria required for the annotation of plant miRNAs are updated, including experimental and computational data, as well as refinements to standard nomenclature.
Transposable elements and the epigenetic regulation of the genome
TLDR
New insights have been gained into how silencing in eukaryotic cells has been co-opted to serve essential functions in 'host' cells, highlighting the importance of TEs in the epigenetic regulation of the genome.
Redundant regulation of meristem identity and plant architecture by FRUITFULL, APETALA1 and CAULIFLOWER.
TLDR
This work finds that mutations in the FRUITFULL (FUL) MADS-box gene, when combined with mutations in AP1 and CAL, lead to a dramatic non-flowering phenotype in which plants continuously elaborate leafy shoots in place of flowers.
Patterns of gene action in plant development revealed by enhancer trap and gene trap transposable elements.
TLDR
The development of an efficient insertional mutagenesis system in Arabidopsis that permits identification of genes by their patterns of expression during development and suggests that the identification and cloning ofArabidopsis genes expressed in any developmental process is feasible using this system.
Epigenetic Reprogramming and Small RNA Silencing of Transposable Elements in Pollen
TLDR
A conserved role for reprogramming in germline companion cells, such as nurse cells in insects and vegetative nuclei in plants, is proposed to reveal intact TEs in the genome and regulate their activity in gametes.
Role of transposable elements in heterochromatin and epigenetic control
TLDR
Using microarray analysis, it is shown that heterochromatin in Arabidopsis is determined by transposable elements and related tandem repeats, under the control of the chromatin remodelling ATPase DDM1 (Decrease in DNA Methylation 1).
Vernalization requires epigenetic silencing of FLC by histone methylation
TLDR
It is shown that vernalization causes changes in histone methylation in discrete domains within the FLC locus, increasing dimethylation of lysines 9 and 27 on histone H3, which identify silenced chromatin states in Drosophila and human cells.
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