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Characterization of ard B and ard C actin gene loci of Physarum polycephalum

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Summary

Physarum polycephalum (strain M3CVIII) contains four unlinked actin gene loci, each with two alleles (ard A1, ard A2, ard B1, ard B2, ard C1, ard C2, ard D1 and ard D2). The 4.8 kbp HindIII component of the ard C2 locus was isolated as a recombinant phage-λ, after HindIII fragments of Physarum DNA ranging from 4.3 kbp to 5.5 kbp were cloned into phage-λ NM1149. The fraction of Physarum DNA cloned contained the ard C locus, and no other actin locus. Small inserts were favoured to reduce the probability of cloning a complete repetitive element, because such elements have been found to adversely affect the stability of recombinants.

The coding sequences of the actin gene (approximately 1.1 kbp) spanned more than 3 kbp indicating the presence of introns. A 1.6 kbp HindIII/EcoRI fragment of the ard C locus, which contained some coding sequences, hybridized extensively with HindIII fragments of genomic DNA indicating the presence of repetitive sequences. A 2.3 kbp HindIII/EcoRI fragment containing most of the coding sequences of the C2 allele of the ard C locus hybridized with the C1, allele and both alleles of the ard B locus, but not with the ard A locus or ard D locus. This distinction was used to establish for the ard B and ard C loci the relationship between the EcoRI and HindIII fragments that define an ard locus. The ability to distinguish between ard loci may facilitate studies of the expression of particular actin loci.

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Authors and Affiliations

  1. National Institute for Medical Research, Mill Hill, NW7 1AA, London, Great Britain

    Mervyn M. Monteiro & Robert A. Cox

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  1. Mervyn M. Monteiro
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  2. Robert A. Cox
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Communicated by C. Auerbach

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Monteiro, M.M., Cox, R.A. Characterization of ard B and ard C actin gene loci of Physarum polycephalum . Molec Gen Genet 204, 153–160 (1986). https://doi.org/10.1007/BF00330203

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  • DOI: https://doi.org/10.1007/BF00330203

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