Ribosomal genes in Coregonid fishes (Coregonus lavaretus, C. albula and C. peled) (Salmonidae): single and multiple nucleolus organizer regions

Ribosomal Rna in the Nucleolus Organizer

Occurrence of multiple nucleolus organizer regions and intraspecific karyotype variation in Scaptotrigona xanthotricha Moure (Hymenoptera, Meliponini).

Scaptotrigona xanthotricha has a wide geographic distribution in the Brazilian Atlantic rainforest. One population from southeast and two from northeast Brazil were analyzed and were found to have chromosome polymorphisms. Although the chromosome number 2n = 34 is conserved in this species, karyotypic analysis revealed clear differences between the three populations. Congruent and ubiquitous mu...

Candidate genes and adaptive radiation: insights from transcriptional adaptation to the limnetic niche among coregonine fishes (Coregonus spp., Salmonidae).

In the past 40 years, there has been increasing acceptance that variation in levels of gene expression represents a major source of evolutionary novelty. Gene expression divergence is therefore likely to be involved in the emergence of incipient species, namely, in a context of adaptive radiation. In the lake whitefish species complex (Coregonus clupeaformis), previous microarray experiments ha...

The Nucleolus and Ribosomal Genes in Aging and Senescence

Nadine Hein1,*, Elaine Sanij1,2,*, Jaclyn Quin1,3, Katherine M. Hannan1, Austen Ganley4,# and Ross D. Hannan1,3,5,6,# 1Division of Cancer Research, Peter MacCallum Cancer Centre, Melbourne, 2Department of Pathology, University of Melbourne, Melbourne, 3Department of Biochemistry and Molecular Biology, University of Melbourne, Melbourne, 4Institute of Natural Sciences, Massey University, Aucklan...

Temporal spawning divergence in European whitefish (Coregonus lavaretus)

A critical step in ecological speciation is the development of reproductive isolation. The processes leading up to reproductive isolation are difficult to study since they often occur over very long time periods. Populations of European whitefish (Coregonus lavaretus) has gone through reticulate divergent evolution in many Scandinavian lakes during the last 10 000 years. Some populations even e...