ISSN:
1617-4623
Keywords:
Cryptic Ac-homologous sequence
;
Activator transposable element
;
Hypermethylation
;
Transposition
;
Maize
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Sequences sharing homology to the transposable element Activator (Ac) are prevalent in the maize genome. A cryptic Ac-like DNA, cAc-11, was isolated from the maize inbred line 4Co63 and sequenced. Cryptic Ac-11 has over 90% homology to known Ac sequences and contains an 11 by inverted terminal repeat flanked by an 8 by target site duplication, which are characteristics of Ac and Dissociation (Ds) transposable elements. Unlike the active Ac element, which encodes a transposase, the corresponding sequence in cAc-11 has no significant open reading frame. A 44 by tandem repeat was found at one end of cAc-11, which might be a result of aberrant transposition. The sequence data suggest that cAc-11 may represent a remnant of an Ac or a Ds element. Sequences homologous to cAc-11 can be detected in many maize inbred lines. In contrast to canonical Ac elements, cAc-11 DNA in the maize genome is hypermethylated and does not transpose even in the presence of an active Ac element.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00265438
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