Abstract:
:Two families of high-cysteine chorion proteins in Bombyx mori are encoded in 15 tandemly arranged nonidentical gene pairs. It is assumed that this locus arose by duplication with subsequent sequence divergence. We have compared DNA sequences from two such neighboring pairs of genes in an attempt to understand the manner in which diversity has been generated and/or removed. A high level of sequence identity (91%-99%) was found between the repeats throughout the transcribed and flanking regions, with two significant exceptions. First, in the DNA segment encoding a conserved region of the chorion proteins, ten substitutions were detected in a 39-base-pair region. This localized region of high variability would suggest an intergene conversion-like event. Second, a length difference of 141 base pairs was detected in a region encoding the carboxy-terminal arm of the protein. This difference can be explained by three separate reiterations of single codons (3 base pairs) separated in time by duplication or triplication events.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Rodakis GC,Lecanidou R,Eickbush THdoi
10.1007/BF02104732subject
Has Abstractpub_date
1984-01-01 00:00:00pages
265-73issue
3-4eissn
0022-2844issn
1432-1432journal_volume
20pub_type
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journal_title:Journal of molecular evolution
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更新日期:2009-02-01 00:00:00
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journal_title:Journal of molecular evolution
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更新日期:1998-04-01 00:00:00
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