Synapsis with and without recombination in the male meiosis of the leaf-footed bug <Emphasis Type="Italic">Holhymenia rubiginosa</Emphasis> (Coreidae,Heteroptera) |
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Authors: | María Ayelén Toscani María Inés Pigozzi María José Bressa Alba G Papeschi |
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Institution: | (1) Laboratorio de Citogenética y Evolución, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, UBA, Intendente Güiraldes 2620, Pabellón 2 - piso 4, Buenos Aires, C1428EHA, Argentina;(2) Centro de Investigaciones en Reproducción, Facultad de Medicina, UBA, Paraguay 2155 - piso 10, Buenos Aires, C1121ABG, Argentina |
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Abstract: | In organisms with chiasmatic meiosis two different relationships have been described between crossing over and synapsis: in
one group of organisms synapsis depends on the initiation of meiotic recombination while in the other group it is independent
of this initiation. These patterns have been observed mainly in organisms where all meiotic bivalents in the set have similar
behaviors. In some heteropteran insects a pair of chromosomes named m chromosomes is known to behave differently from autosomes
regarding synapsis and recombination. Here we used immunodetection of a synaptonemal complex component and acid-fixed squashes
to investigate the conduct of the small m chromosome pair during the male meiosis in the coreid bug Holhymenia rubiginosa. We found that the m chromosomes form a synaptonemal complex during pachytene, but they are not attached by a chiasma in
diakinesis. On the other hand, the autosomal bivalents synapse and recombine regularly. The co-existence of these variant
chromosome behaviors during meiosis I add further evidence to the absence of unique patterns regarding the interdependence
of synapsis and recombination. |
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Keywords: | Heteroptera Holokinetic chromosomes Meiosis Recombination Synapsis |
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