Abstract
We isolated DNA fragments containing various repetitive elements from the genome of a sea bream Acanthopagrus latus. Sequence analysis indicated that two fragments have particularly interesting features. Fragment AL87 contained a tetranucleotide repeat and a quasipalindromic sequence. Sequence comparison suggested that AL87 may be a part of a gene encoding a serine/threonine protein kinase, and that the quasipalindrome is situated at the junction of an intron and an exon. Moreover, the quasipalindrome is conserved in several other fishes, even though it has the potential to form a stem-loop structure at the splicing site. Fragment AL79 contained a minisatellite sequence made up of six 30-bp units in tandem. DNase I sensitivity assays and statistical analyses showed the repeat region to be flexible when subjected to bending stress. In addition, atomic force microscopic imaging of AL79 showed the presence of highly curved (kinked) segments flanking the repeat region. The structural features of these repetitive elements may be key factors facilitating the amplification of the repeats.
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Abbreviations
- AFM:
-
atomic force microscopy
- bp:
-
base pairs
- GnRH:
-
gonadotropin-releasing hormone gene
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Elmesiry, G.E., Okai, S., Hokabe, S. et al. Isolation and characterization of simple repeat sequences from the yellow fin sea bream Acanthopagrus latus (Sparidae). Mol Biol Rep 32, 117–126 (2005). https://doi.org/10.1007/s11033-004-0566-3
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DOI: https://doi.org/10.1007/s11033-004-0566-3