Abstract:
:Transposable elements are disproportionately abundant in the heterochromatin of Drosophila melanogaster. Among the forces contributing to this bias in genomic distribution, fixation due to positive selection has been put forward. We have studied I-related elements which are located in pericentromeric heterochromatin and are believed to have a role in the control of active I elements. Flies straight from the wild have been studied where fixed elements are expected to emerge clearly over the highly polymorphic background in the genomic distribution of transposable elements. The results show that some restriction fragments due to I-related elements are conserved in size and are present in all individuals tested, consistent with a selective pressure for a role. Other fragments are polymorphic in presence/absence and intensity in individuals from the wild but appear homogeneous in laboratory stocks. Although the significance of this type of instability is unclear, the finding that these polymorphic bands are recurrent in populations from distant geographical locations is also suggestive of a selective pressure for a role.
journal_name
Cytogenet Genome Resjournal_title
Cytogenetic and genome researchauthors
Junakovic N,Fortunati D,Soriano Sdoi
10.1159/000084950keywords:
subject
Has Abstractpub_date
2005-01-01 00:00:00pages
173-80issue
1-4eissn
1424-8581issn
1424-859Xpii
84950journal_volume
110pub_type
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abstract::Genetic maps are based on the recombination frequency of molecular markers which often show different positions in comparison to the corresponding physical maps. To decipher the position and order of DNA sequences genetically mapped to terminal and interstitial regions of barley (Hordeum vulgare) chromosome 3H, fluore...
journal_title:Cytogenetic and genome research
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更新日期:2017-01-01 00:00:00
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journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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更新日期:2007-01-01 00:00:00
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journal_title:Cytogenetic and genome research
pub_type: 杂志文章
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更新日期:2016-01-01 00:00:00
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journal_title:Cytogenetic and genome research
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更新日期:2012-01-01 00:00:00
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journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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更新日期:2006-01-01 00:00:00
abstract::Chromosome homologies in reptiles have been investigated extensively by gene mapping and chromosome painting. Relative chromosome size can be estimated roughly from conventional karyotypes, but chromosome GC content cannot be evaluated by any of these approaches. However, GC content can be obtained by whole-genome seq...
journal_title:Cytogenetic and genome research
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abstract::The INRA and the CHORI-241 horse BAC libraries were screened by hybridization with DNA probes and/or directly by PCR with primers designed in consensus sequences of genes localized at the end of each human chromosome. BAC clones were retrieved and 36 could be FISH mapped after the expected gene was confirmed in each B...
journal_title:Cytogenetic and genome research
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更新日期:2005-01-01 00:00:00
abstract::Both cattle (Bos taurus) and sheep (Ovis aries) belong to the Bovidae family but to different subfamilies, Bovinae and Caprinae, respectively. From a chromosomal point of view, apart from the already known centric fusions (that occurred during the evolutionary process in the Bovidae family) and the small differences i...
journal_title:Cytogenetic and genome research
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journal_title:Cytogenetic and genome research
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abstract::To define the process of karyotypic evolution in the Galliformes on a molecular basis, we conducted genome-wide comparative chromosome painting for eight species, i.e. silver pheasant (Lophura nycthemera), Lady Amherst's pheasant (Chrysolophus amherstiae), ring-necked pheasant (Phasianus colchicus), turkey (Meleagris ...
journal_title:Cytogenetic and genome research
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