Chromosome numbers in the Triatominae (Hemiptera-Reduviidae): a review

Panzera, Francisco; Pérez, Ruben; Hornos, Sonia; Panzera, Yanina; Cestau, Rosario; Delgado, Verónica; Nicolini, P.

doi:10.1590/s0074-02761996000400021

Cited by 32 publications

(24 citation statements)

References 9 publications

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“…The typical autosome number (A) in triatomines is 20 (Panzera et al, 1996) (Panzera et al 1996;Panzera et al, 1998). Additionally, in the genus Triatoma the Y chromosome is larger than the X (Pérez et al 1997;Pérez et al 2000;Pérez et al, 2005), as seen in T. klugi.…”

Section: Discussionmentioning

confidence: 99%

Spermatogenesis and nucleolar activity in Triatoma klugi (triatomine, Heteroptera)

2008

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Triatoma klugi is a Chagas disease vector in the Rio Grande do Sul State. Triatominae chromosomes are holocentric and sex chromosomes segregation is post-reductional. In this paper we describe the karyotype of male T. klugi and a meiotic analysis including the nucleolar behavior during spermatogenesis. Testis cells were analyzed after lactoacetic orcein and silver nitrate staining. Two autosomes and the heterochromosomes presented nucleolar activity (Ag-NORs) during diplotene-diakinesis. The analysis of metaphase I and II revealed a karyotype with 2n = 20+XY. In metaphase I a prominent nucleolar mass was observed in the cell periphery and small silver grains were detected in metaphase II. During anaphase, the chromosomes segregated in parallel and a typical holocentric late migration behavior was observed. The restoration of the nucleolus was an important feature in this phase. During telophase nucleolar masses persisted and in early spermiogenesis the spermatids presented a small peripheral mass until elongation. The present study is a contribution to the study of chromatin behavior and nucleolar persistence in meiosis.

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Section: Discussionmentioning

confidence: 99%

Spermatogenesis and nucleolar activity in Triatoma klugi (triatomine, Heteroptera)

2008

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“…In these studies, the comparison criteria were often the number, morphology, and arrangement of chromosomes in the metaphase plate. The data obtained from these investigations gave the first indications of the processes that occurred during chromosomal evolution in these insects (Pérez et al, 1992;Panzera et al, 1996;Tavares and Azeredo-Oliveira, 1997).…”

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confidence: 92%

“…However, there are species with multiple sex chromosomes (XY, X 1 X 2 Y, X 1 X 2 X 3 Y), caused by fragmentation of the original X (Manna, 1950;Ueshima, 1966), as in T. tibiamaculata (X 1 X 2 Y) (Panzera et al, 1996) and T. vitticeps (X 1 X 2 X 3 Y) (Schreiber and Pellegrino, 1950). The karyotype of T. melanocephala has been recently described (Alevi et al, 2012a) and approaches that of T. vitticeps and T. eratyrusiformis, because among the 140 species of triatomines described, only the males of these species have a diploid chromosome number 2n = 24 (20A + X 1 X 2 X 3 Y) (Panzera et al, 2010).…”

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confidence: 99%

Short Communication Spermatogenesis in Triatoma melanocephala (Hemiptera: Triatominae)

Alevi¹,

Mendonca²,

Pereira³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Triatoma melanocephala is a rare species of Hemiptera. It belonged to the Brasiliensis subcomplex and presents morphological characteristics very close to those of Triatoma vitticeps. We investigated spermatogenesis of T. melanocephala and compared it with that of T. vitticeps in order to determine whether these organisms have similar cytogenetic characteristics. Lacto-acetic orcein staining was used to observe all stages of meiosis. These two species were found to have the same karyotype (2n = 20A + X 1 X 2 X 3 Y), heteropycnotic corpuscles in the polyploid spermatogonial cells, interfasic and profasic nucleus, and chromocenter with four sex chromosomes during prophase. Thus, we conclude that besides the morphologic similarity of T. melanocephala with T. vitticeps, they also have similar spermatogenesis and cytogenetics.

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“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Alevi¹,

Moreira

Jurberg

et al. 2016

Genet. Mol. Res.

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ABSTRACT. Triatoma pintodiasi has been described and recently grouped in the Rubrovaria subcomplex. T. pintodiasi was initially compared to T. carcavalloi by staining and subsequently identified as T. circummaculata. However, after thorough examination, it was observed to be a cryptic species of T. circummaculata, and was described based on morphological features, morphometric data, and biochemical patterns of hemolymph. Thus, this paper aims to describe the karyotype of, and spermatogenesis in, T. pintodiasi, in order to elucidate the reproductive biology and taxonomy of the species. Sex chromosomes of T. pintodiasi formed a heteropyknotic chromocenter, and compaction of chromatin was observed during prophase. However, in contrast to observations in T. carcavalloi and T. circummaculata, in T. pintodiasi it was observed individualization of the sex chromosomes. The diploid chromosome set of the species 2n = 22 (20A + XY) is described through analysis of metaphases I and II. Initial cytogenetic characteristics of T. pintodiasi are described and the observed differences in the chromocenter

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Chromosome numbers in the Triatominae (Hemiptera-Reduviidae): a review

Abstract: The chromosome numbers of 46 out of the 122 currently recognized species of Triatominae (Hemiptera, Reduviidae) are summarized. We present the number of autosomes, the sex mechanism and the first reference for each karyotype.

Cited by 32 publications

References 9 publications

Spermatogenesis and nucleolar activity in Triatoma klugi (triatomine, Heteroptera)

Spermatogenesis and nucleolar activity in Triatoma klugi (triatomine, Heteroptera)

Short Communication Spermatogenesis in Triatoma melanocephala (Hemiptera: Triatominae)

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

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