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  • 1
    Electronic Resource
    Electronic Resource
    The distribution of satellite and main-band DNA components in the melanogaster species subgroup of Drosophila (1978)
    Springer
    Chromosoma 67 (1978), S. 341-363 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Fractionation of total adult DNA of five of the seven species of the melanogaster species sub-group of Drosophila in actinomycin D and distamycin A caesium density gradients has revealed the presence of three main-band DNA components, common to all species, and ten satellite DNAs that are distributed between the species. Satellite DNAs are either unique to a species or common to two or more species. The abundance of a common satellite DNA varies between species. There is no simple relationship between the presence of a satellite DNA and a branch point of phylogenetic divergence; nevertheless the arrangement of the species in a phylogeny that is based on the numbers of satellites held in common accurately reflects the pattern of relationships between the same species based on differences in inversions of polytene chromosomes. The species can be similarly arranged according to the compositions of their mitochondrial DNAs. It is possible that the same basic set of sequences, each of low frequency, is common to all species with arbitrary or selected amplification of particular sequences to differing extents in individual species. The conservation of satellites in the group and the close parallel between the distributions of satellites and inversions between the species suggests that either the processes that operate to change both chromosomal phenomena are similarly time-dependent and occurring at relatively low rates or that their rates of change are restricted according to some undetermined functions of these aspects of the genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285965
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The organisation, nucleotide sequence, and chromosomal distribution of a satellite DNA from Allium cepa (1985)
    Springer
    Chromosoma 92 (1985), S. 185-192 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have investigated the organisation, nucleotide sequence, and chromosomal distribution of a tandemly repeated, satellite DNA from Allium cepa (Liliaceae). The satellite, which constitutes about 4% of the A. cepa genome, may be resolved from main-band DNA in antibiotic-CsCl density gradients, and has a repeat length of about 375 base pairs (bp). A cloned member of the repeat family hybridises exclusively to chromosome telomeres and has a non-random distribution in interphase nuclei. We present the nucleotide sequences of three repeats, which differ at a large number of positions. In addition to arrays made up of 375-bp repeats, homologous sequences are found in units with a greater repeat length. This divergence between repeats reflects the heterogeneity of the satellite determined using other criteria. Possible constraints on the interchromosomal exchange of repeated sequences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348692
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular analysis of the structure of the maize B-chromosome (1996)
    Springer
    Chromosome research 4 (1996), S. 15-23 
    Details
    ISSN: 1573-6849
    Keywords: B-chromosome ; DNA sequence composition ; PREM-1 element ; random amplification of polymorphic DNA ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The overall composition of the maize B is similar to that of the standard chromosome complement (A-chromosomes). This has been demonstrated by the use of several methods including: (a) genomicin situ hybridization (GISH), (b) analysis of highly repetitive sequences by the comparison of restriction digests of 0B and +B DNA and (c) the characterization of middle-repetitive cloned sequences. By the use of the technique of random amplification of polymorphic DNA-polymerase chain reaction, we have identified a B-specific repetitive sequence family. Sequence analysis of the B-specific clone reveals a relationship to the PREM-1 family of maize retroelements, which are preferentially transcribed in pollen. These results suggest an internal origin of the B-chromosome from within the maize genome, but demonstrate also that specific sequences can evolve by rapid processes of genomic turnover. Models for the origin of the maize B are discussed in the context of the present data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02254939
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    Paper (German National Licenses)
    Fulltext
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