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Title:   Author  item
                                            TIAN, YANG - PURDUE UNIVERSITYitem
                                            Goodwin, Stephen

                                                         - *Steve*
  Submitted to: Phytopathology
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/29/2002
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: We previously identified a putative transposable element in a DNA fingerprint probe from the wheat leaf blotch pathogen Mycosphaerella graminicola. This transposable element is very stable. However, it moved occasionally in one isolate during asexual reproduction. The active copy and four inactive copies of the reverse transcriptase gene were cloned and sequenced. A high frequency of RIP mutations (G:C to A:T transitions) were found by DNA sequence comparison of these five clones. These mutations occurred not only in the reverse transcriptase gene coding region but also in the flanking region. All copies except the active one contain one or more stop codons within the coding region. Furthermore, most of the stop codon mutations were G:C to A:T, most likely due to RIP. By comparison, a single-copy gene from M. graminicola showed no evidence of RIP. This may provide the first evidence for RIP in a Loculoascomycete and indicates that RIP may be important for inactivating transposable elements for fungi in the genus Mycosphaerella.


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