Cytological evidence for automictic thelytoky in parthenogenetic oribatid mites (Acari, Oribatida) : Synaptonemal complexes confirm meiosis in Archegozetes longisetosus
| Autor: | Bergmann, Paavo, Laumann, Michael, Norton, Roy A., Heethoff, Michael |
|---|---|
| Přispěvatelé: | Universität Konstanz, Institut für Evolution und Ökologie, Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, State University of New York (SUNY) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Arthropoda prophasic arrest Acariformes 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Meiosis ddc:570 Mite Animalia holokinetic chromosomes "ancient asexuals" diakinesis failure prophasic arrest unisexual Acari Oribatida GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) achiasmate biology Parthenogenesis diakinesis failure biology.organism_classification Archegozetes longisetosus unisexual Sarcoptiformes [SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology 030104 developmental biology holokinetic chromosomes Evolutionary biology Insect Science ’ancient asexuals’ Thelytoky |
| Zdroj: | Acarologia Acarologia, Acarologia, 2018, 58 (2), pp.342-356. ⟨10.24349/acarologia/20184246⟩ |
| ISSN: | 0044-586X 2107-7207 |
| DOI: | 10.24349/acarologia/20184246⟩ |
| Popis: | International audience; Diplo-diploid parthenogenesis (thelytoky) is a widespread phenomenon in the mite taxon Sarcoptiformes, and is unusually frequent in the suborder Oribatida, where it characterizes almost 10% of extant species, including whole genera and families. Based on molecular and cytological data, terminal fusion automixis with an inverted meiotic sequence based on holokinetic chromosomes has been suggested as the reproductive mode in these mites. However, unequivocal structural evidence for meiosis is missing. The model organism Archegozetes longisetosus, a thelytokous member of the parthenogenetic family Trhypochthoniidae, was studied to gain ultrastructural insight in oocyte progression and meiotic processes. In this study, ovarian nuclear organization of its tritonymphal instar was examined by transmission electron microscopy (TEM). Numerous synaptonemal complexes were observed in the ovary, unequivocally confirming automixis (meiotic thelytoky) in oribatid mites for the first time. No recombination nodules were found. The nuclei are transcriptionally active in late prophase. Inverted meiosis is discussed as a result of the spatial arrangement of chromatid segregation. |
| Databáze: | OpenAIRE |
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