Comparative analysis of Mutator-like transposases in sugarcane
Comparative analysis of Mutator-like transposases in sugarcane
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DOI：
10.1007/s00438-004-1036-2
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发表时间：
2004-09-01
影响因子：
3.1
通讯作者：
Van Sluys, MA
中科院分区：
文献类型：
--
作者：
Rossi, M;Araujo, PG;Van Sluys, MA
The maize Mutator (Mu) system has been described as the most active and mutagenic plant transposon so far discovered. Mu-like elements (MULEs) are widespread among plants, and many and diverse variants can coexist in a particular genome. The autonomous regulatory element MuDR contains two genes. mudr A encodes the transposase, while the function of the mudr B gene product remains unknown. Although mudr A-like sequences are ubiquitous in plants, mudr B seems to be restricted to the genus Zea. In the SUCEST (the Brazilian Sugarcane EST Sequencing Project) database, several mudrA-like cDNAs have been identified, suggesting the presence of a transcriptionally active Mu system in sugarcane. Phylogenetic studies have revealed the presence in plants of four classes of mudrA-like sequences, which arose prior to the monocot/eudicot split. At least three of the four classes are also found in the progenitors of the sugarcane hybrid (Saccharum spp.), Saccharum officinarum and S. spontaneum. The frequency of putatively functional transposase ORFs varies among the classes, as revealed at both cDNA and genomic levels. The predicted products of some sugarcane mudrA-like transcripts contain both a DNA-binding domain and a transposase catalytic-site motif, supporting the idea that an active Mu system exists in this hybrid genome.
