[Todos] Seminarios conjuntos DFBMC-IFIByNE- Dr.Thomas Börner

[Paula Felman]

Seminario jueves 23 de Octubre. 13 hs. Aula del LFBM


>Dr.Thomas Börner
>
>Title: “Variation in nuclear, chloroplast and mitochondrial gene copy
>numbers during development of Arabidopsis leaves”.
>
>Institute of Biology/Genetics, Humboldt University Berlin, Germany
>
>Summary: The number of gene copies per cell is usually regarded as a more
>or less static figure. The model plant Arabidopis thaliana is diploid.
>Diploidy of the zygote (and haploidy of the gametes), however, does not
>mean that the nuclei of all cells in all tissues contain two sets of
>chromosomes. Due to the process of endoreduplication of the DNA
>(replication without cell division), Arabidopsis cells may exhibit much
>higher ploidy levels compared to the zygote. The situation in mitochondria
>and chloroplasts is more complex since these organelles contain usually
>larger numbers of genome/gene copies than the nucleus while not possessing
>the precise mechanisms of chromosome distribution to daughter organelles
>during division that is operating in the case of nuclear chromosomes. We
>have investigated the number of gene copies in the nucleus, chloroplasts
>and mitochondria during leave development of A. thaliana. There are
>drastic changes in case of all three genomes. The consequences of these
>changes will be discussed.
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