Distribution and molecular composition of heterochromatin in the holocentric chromosomes of the aphid Rhopalosiphum padi (Hemiptera: Aphididae)

Monti, Valentina; Manicardi, Gian Carlo; Mandrioli, Mauro

doi:10.1007/s10709-010-9493-5

Cited by 11 publications

(9 citation statements)

References 55 publications

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“…The few studies carried out to date on satDNA sequences in organisms possessing holocentric chromosomes have mostly focused on nematodes (Roth, ; Collet & Westerman, ; Naclerio et al , ; Castagnone‐Sereno et al , 1998 a , b ). Among aphids, satellite DNAs have been isolated in five aphid species only: one in Megoura viciae (Bizzaro, Manicardi & Bianchi, ), one in Rhopalosiphon padi (Linnaeus) (Monti, Manicardi & Mandrioli, ), two in M. persicae (Spence et al , ; Mandrioli et al , 1999 a ), two in Amphorophora tuberculata (Spence & Blackman, ) and four in Aphis nerii (Mandrioli et al , )…”

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

“…Molecular analyses of these aphid satDNAs have shown that their consensus sequences are variable in length from 100 to 600 bp, and that none of them possesses significant direct or inverted repeats (Bizzaro et al , ; Spence et al , ; Monti et al , ; Mandrioli et al , ).…”

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

“…The few studies carried out to date on satDNA sequences in organisms possessing holocentric chromosomes have mostly focused on nematodes (Roth, 1979;Collet & Westerman, 1987;Naclerio et al, 1992;Castagnone-Sereno et al, 1998a,b). Among aphids, satellite DNAs have been isolated in five aphid species only: one in Megoura viciae , one in Rhopalosiphon padi (Linnaeus) (Monti, Manicardi & Mandrioli, 2010), two in M. persicae Mandrioli et al, 1999a), two in Amphorophora tuberculata and four in Aphis nerii (Mandrioli et al, 2011) The chromosomal localization of these satellites, investigated by fluorescent in situ hybridization (FISH), mostly corresponded to C-positive heterochromatic areas on the X chromosome (Fig. 5E).…”

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

“…The transcription of insect satDNAs has been studied in few species and just some of them present RNAs related to these repetitive DNAs (Palomeque & Lorite, 2008). Aphid satDNA transcripts have been searched by reversetranscription polymerase chain reaction (RT-PCR) in R. padi only without any positive result (Monti et al, 2010). However, transcription of insect satDNAs has been related to cell type, developmental stage and sex so that it may not be easy to detect any transcript (Renault et al, 1999;Palomeque & Lorite, 2008).…”

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

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The cytogenetic architecture of the aphid genome

2014

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In recent years aphids, with their well-defined polyphenism, have become favoured as model organisms for the study of epigenetic processes. The availability of the pea aphid (Acyrthosiphon pisum) genome sequence has engendered much research aimed at elucidating the mechanisms by which the phenotypic plasticity of aphids is inherited and controlled. Yet so far this research effort has paid little attention to the cytogenetic processes that play a vital part in the organisation, expression and inheritance of the aphid genome. Aphids have holocentric chromosomes, which have very different properties from the chromosomes with localised centromeres that are found in most other organisms. Here we review the diverse forms of aphid chromosome behaviour that occur during sex determination and male and female meiosis, often in response to environmental changes and mediated by endocrine factors. Remarkable differences occur, even between related species, that could have significant effects on the inheritance of all or parts of the genome. In relation to this, we review the particular features of the distribution of heterochromatin, rDNA genes and other repetitive DNA in aphid chromosomes, and discuss the part that these may play in the epigenetic modification of chromatin structure and function.

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Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

Section: Distribution Of Repeated Dna In the Aphid Chromosomesmentioning

confidence: 99%

See 2 more Smart Citations

The cytogenetic architecture of the aphid genome

2014

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“…72 This supports the opinion expressed above in relation to the Commission's endorsement of pollution abatement as an efficiency gain on par with traditional economic efficiencies in the Article 81(3) EC inquiry. 73 Secondly, the Commission explicitly acknowledges that the collective environmental benefits generated by the agreement would be sufficient, without more, to satisfy the second positive criterion of Article 81(3) EC. Some commentators have criticised this approach for extending the ambit of Article 81(3) EC from a provision essentially concerned with consumer benefits to one which addresses total welfare.…”

Section: Commission Decisional Practice: Post-amsterdammentioning

confidence: 99%

Disintegration: Environmental Protection and Article 81 EC

Casey

2009

European Law Journal

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This article addresses the question of whether the modernisation and decentralisation of EC competition law will affect the integration of environmental protection requirements into the framework of Article 81 EC. First, the interface between competition policy and environmental protection at both the constitutional level and operational level is investigated. Following this, the Commission's assessment of environmental benefits under Article 81(3) EC prior to decentralisation and modernisation is explored. It is submitted that the Commission's expansion of its interpretation of the first two positive criteria of Article 81(3) EC allowed environmental objectives and competition goals to be balanced within the framework of Article 81 EC. Finally, this article examines the extent to which the decentralisation and modernisation of Community competition law may impede the integration of environmental protection into the definition and implementation of Article 81 EC.

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