Chromosome variability in the Chagas disease vector Rhodnius pallescens (Hemiptera, Reduviidae, Rhodniini)

Abstract

Rhodnius pallescens is the main vector of

Chromosomal divergence and evolutionary inferences in Rhodniini based on the chromosomal location of ribosomal genes

“…The uniformity of the ribosomal gene location in R. prolixus, including the sylvatic and domestic populations, was consistent with the molecular studies indicating low variability in this species . In R. pallescens, the two evolutionary groups with morphometric and genetic divergence (Gómez-Palacio et al 2008) also presented the same rDNA chromosome location. However, for R. ecuadoriensis, we detected striking differences in the rDNA location between the individuals from Peru and Ecuador (Fig.…”

“…In addition, Rhodniini species exhibit chromosomes of similar size and possess the lowest genomic DNA content of all the triatomines (Panzera et al 2007). Only a few Rhodniini species present C-heterochromatin (Rhodnius colombiensis, Rhodnius nasutus, R. pallescens and Rhodnius pictipes) (Dujardin et al 2002), with only one of these species exhibiting C-band polymorphisms (Gómez-Palacio et al 2008.…”

“…For R. ecuadoriensis, we studied populations from different countries, i.e., Peru and Ecuador. For R. pallescens, we included new populations from Colombia and Panama, representing the two evolutionary groups of the species recognised by morphometric, molecular and cytogenetic differences, as reported by Gómez-Palacio et al (2008 (Table).…”

Description of the diploid chromosome set of Triatoma pintodiasi (Hemiptera, Triatominae)

“…The 148 species currently described (Abad-Franch et al, 2013;Alevi et al, 2013a;Jurberg et al, 2013;Poinar Jr., 2013) are potential vectors of the protozoan Trypanosoma cruzi, the etiologic agent of Chagas disease. Triatomines are also of biological interest because their cells have several peculiarities in comparison to cells of other eukaryotes, such as holocentric chromosomes (Panzera et al, 1996), inverted meiosis for sex chromosomes (Gómez-Palacio et al, 2008), and persistence of nucleolar material during meiosis (Tartarotti and Azeredo-Oliveira, 1999;Alevi et al, 2014a). In addition, triatomines are of evolutionary interest because their origins (monophyletic or polyphyletic) have not been conclusively determined (Tartarotti et al, 2006;Hwang and Weirauch, 2012).…”

Spermatogenesis and nucleolar behavior in Triatoma vandae and Triatoma williami (Hemiptera, Triatominae)

“…These vectors have some peculiar characteristics, such as holocentric chromosomes with diffuse kinetochores (Panzera et al, 1996), inverted meiosis for sex chromosomes (Gómez-Palacio et al, 2008), and nucleolar persistence during meiosis (Tartarotti and Azeredo-Oliveira, 1999). Schofield and Galvão (2009) grouped triatomines into complexes and specific subcomplexes, based primarily on geographical distribution and morphological characters.…”