Physical mapping of 18S and 5S rDNA loci and histone H3 gene in grasshopper species of the subfamily Gomphocerinae (Acrididae)

Silva-Neto, L.C.; Bernardino, Andrezza C.S.; Loreto, Vilma; Moura, Rita C.

doi:10.4238/2015.november.24.8

Cited by 4 publications

(1 citation statement)

References 16 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamics of dispersion of repetitive sequences in chromosomes is often associated with the presence of active transposable elements (TE) in the genomes (Silva-Neto et al 2015), which could explain the different patterns in the distribution of heterochromatin blocks and rDNAs 5S cistrons in different pairs of chromosomes. rDNA sequence analyses have demonstrated the existence of these elements in spacer regions, disseminating gene families in functional copies or pseudogenes (Drouin et al 1995;Gornung 2013;Rebordinos et al 2013;Symonová et al 2013).…”

Section: Discussionmentioning

confidence: 99%

EVOLUTIONARY TRENDS IN SPECIES COMPLEX DIAGNOSED BY CYTOGENETIC POLYMORPHISM: THE CASE OFHypostomus ancistroides(SILURIFORMES, LORICARIIDAE)

Kavalco

Reis

Brandão

et al. 2020

Preprint

View full text Add to dashboard Cite

We present a concept that summarizes the pattern of occurrence of widely distributed organisms with large chromosomal diversity, low molecular divergence, and the absence of morphological identity. Our model is based on cytogenetic and molecular data of four populations of the siluriform Hypostomus ancistroides presented in this study in comparison with those of 15 other previously described populations but is applicable to any group of sister species, chronospecies, or cryptic species. Through the evaluation of karyotype macrostructure and physical location of genes, in addition to phylogenetic reconstructions from mitochondrial and nuclear genes, we observed morphologically indistinguishable individuals presenting different locally fixed karyomorphs with phylogeographic discontinuity. The process behind this pattern seen in many groups of cryptic species, in which variation lies mainly in the organization of their genomes but not necessarily in the ecosystems they inhabit or in their external morphology, is similar to the processes behind other events observed in the distribution of lineages. In this work we explain this pattern through the hypothesis of the existence of a process analogous to ecological-evolutionary radiation, the chromosomal radiation, which can be adaptive or non-adaptive, and explore the possibility of applying the concept of chromosomal radiation to different groups of organisms.

show abstract

Section: Discussionmentioning

confidence: 99%