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Rye Bs disclose ancestral sequences in cereal genomes with a potential role in ...
Pereira, H. Sofia; Barão, Augusta; Caperta, A.; Rocha, João; Viegas, Wanda; Delgado, MargaridaResearch Article ; Two sequence families, E3900 and D1100, are amplified on the subtelomeric domain of the long arm of rye B chromosomes, the region that controls its drive mechanism. In this work, polymerase chain reaction (PCR) with a number of primers spanning E3900 shows that the organization and nucleotide sequence of E3900-related portions are present and highly conserved on rye A chromosomes as well as ...
Polyploidization as a retraction force in plant genome evolution: sequence rear...
Silva, Manuela; Viegas, Wanda; Bento, Miguel; Pereira, H. Sofia; Rocheta, Margarida; Gustafson, PerryBackground. Polyploidization is a major evolutionary process in plants where hybridization and chromosome doubling induce enormous genomic stress and can generate genetic and epigenetic modifications. However, proper evaluation of DNA sequence restructuring events and the precise characterization of sequences involved are still sparse. Methodology/Principal Findings. Inter Retrotransposons Amplified Polymorphis...
Interplay of ribosomal DNA Loci in nucleolar dominance: dominant NORs are up-re...
Silva, Manuela; Viegas, Wanda; Pereira, H. Sofia; Bento, Miguel; Santos, Ana Paula; Shaw, Peter; Delgado, Margarida; Neves, NunoBackground: Chromatin organizational and topological plasticity, and its functions in gene expression regulation, have been strongly revealed by the analysis of nucleolar dominance in hybrids and polyploids where one parental set of ribosomal RNA (rDNA) genes that are clustered in nucleolar organizing regions (NORs), is rendered silent by epigenetic pathways and heterochromatization. However, information on the...
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