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A second locus for the 5S multigene family in Secale L.: sequence divergence in two lineages of the family


A second locus for the 5S multigene family in Secale L.: sequence divergence in two lineages of the family



Genome 32(3): 457-467



ISSN/ISBN: 0831-2796

PMID: 2545523

DOI: 10.1139/g89-469

The 5S RNA genes in Secale sp. are arranged as tandem arrays of a 460- and 480-bp repeating sequence. These size classes were initially discovered by restriction endonuclease analysis using BamHI and subsequently by DNA sequencing of cloned units. The length variation between short and long units originated from major deletion-insertion events in the noncoding spacer region of the 5S DNA repeat units. In situ hybridization with [3H]cRNA and biotin-labelled probes synthesized from both the short and long 5S DNA units of S. cereale localized the sites on chromosome 1R and a new site on a chromosome identified as 5R. We propose that the chromosome 1R locus, which has been mapped previously, be named 5SDna-R1 and the second locus, reported in the present paper, be referred to as 5SDna-R2. A preferential hybridization of a probe from the long unit to the 5SDna-R2 locus and of a probe from the short unit to the 5SDna-R1 locus is reported. The clustering of long units in the 5SDna-R2 locus was confirmed by restriction endonuclease digestion of DNA from rye chromosome 5R additions to wheat. Nucleotide sequence alignment of 5S DNA repeat units from a number of Secale species, using both phenetic and cladistic computer programmes, demonstrated that two clear lineages corresponding to the long and short units existed in this genus. The different Secale species could not be unambiguously differentiated using the 5S DNA sequences.

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Accession: 006965112

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