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• (author = "Pikaard, Craig S." AND subject = "Biological Sciences")
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author = "Pikaard, Craig S." > : "Biological Sciences" (x)
1

Found 6 documents, displaying page 1 of 1

Extensive purification of a putative RNA polymerase I holoenzyme from plants that accurately initiates rRNA gene transcription in vitro

Author(s) : Saez-Vasquez, Julio , Pikaard, Craig S.
Description : RNA polymerase I (pol I) is a nuclear enzyme whose function is to transcribe the duplicated genes encoding the precursor of the three largest ribosomal RNAs. We report a cell-free system from broccoli (Brassica oleracea) inflorescence that supports promoter-dependent RNA pol I transcription in vitro...
Repository : Europe PubMed Central
Language(s) : English

Restricted chromosomal silencing in nucleolar dominance

Author(s) : Lewis, Michelle S. , Pikaard, Craig S.
Description : Failure of one parent's chromosomes to organize nucleoli in an interspecific hybrid is an epigenetic phenomenon known as nucleolar dominance. Selective gene silencing on a scale of millions of bp is known to be involved, but the full extent to which nucleolus organizer region (NOR)-bearing chrom...
Repository : Europe PubMed Central
Language(s) : English

Transcriptional analysis of nucleolar dominance in polyploid plants: Biased expression/silencing of progenitor rRNA genes is developmentally regulated in Brassica

Author(s) : Chen, Z. Jeffrey , Pikaard, Craig S.
Description : Nucleolar dominance is an epigenetic phenomenon that describes the formation of nucleoli around rRNA genes inherited from only one parent in the progeny of an interspecific hybrid. Despite numerous cytogenetic studies, little is known about nucleolar dominance at the level of rRNA gene expression in...
Repository : Europe PubMed Central
Language(s) : English

Gene dosage and stochastic effects determine the severity and direction of uniparental ribosomal RNA gene silencing (nucleolar dominance) in Arabidopsis allopolyploids

Author(s) : Chen, Z. Jeffrey , Comai, Luca , Pikaard, Craig S.
Description : Nucleolar dominance is an epigenetic phenomenon in which one parental set of ribosomal RNA (rRNA) genes is silenced in an interspecific hybrid. In natural Arabidopsis suecica, an allotetraploid (amphidiploid) hybrid of Arabidopsis thaliana and Cardaminopsis arenosa, the A. thaliana rRNA genes are re...
Repository : Europe PubMed Central
Language(s) : English

Chromosomal locus rearrangements are a rapid response to formation of the allotetraploid Arabidopsis suecica genome

Author(s) : Pontes, Olga , Neves, Nuno , Silva, Manuela , Lewis, Michelle S. , Madlung, Andreas , Comai, Luca , Viegas, Wanda , Pikaard, Craig S.
Description : Allopolyploidy is a significant evolutionary process, resulting in new species with diploid or greater chromosome complements derived from two or more progenitor species. We examined the chromosomal consequences of genomic merger in Arabidopsis suecica, the allotetraploid hybrid of Arabidopsis thali...
Repository : Europe PubMed Central
Language(s) : English

Natural variation in nucleolar dominance reveals the relationship between nucleolus organizer chromatin topology and rRNA gene transcription in Arabidopsis

Author(s) : Pontes, Olga , Lawrence, Richard J. , Neves, Nuno , Silva, Manuela , Lee, Jae-Hyeok , Chen, Z. Jeffrey , Viegas, Wanda
Description : In genetic hybrids, nucleolus formation on chromosomes inherited from only one parent is the epigenetic phenomenon, nucleolar dominance. By using Arabidopsis suecica, the allotetraploid hybrid of Arabidopsis thaliana and Arabidopsis arenosa, natural variation in nucleolar dominance was found to occu...
Repository : Europe PubMed Central
Language(s) : English
1

Found 6 documents, displaying page 1 of 1