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. 2001 Feb;32(1):11-9.
doi: 10.1006/fgbi.2000.1246.

Organization and Distribution Pattern of MGLR-3, a Novel Retrotransposon in the Rice Blast Fungus Magnaporthe Grisea

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Organization and Distribution Pattern of MGLR-3, a Novel Retrotransposon in the Rice Blast Fungus Magnaporthe Grisea

S Kang. Fungal Genet Biol. .

Abstract

A specific telomere was deleted in spontaneous, gain-of-virulence mutants derived from a rice pathogen of Magnaporthe grisea. Three different types of transposons, including Pot2, Mg-SINE, and a novel, 6-kb-long LTR (long terminal repeat)-type retrotransposon designated MGLR-3, were identified on this chromosomal end. The 114-bp-long telomeric repeat is immediately followed by the 3' LTR of MGLR-3. A truncated copy of Pot2 immediately flanks the 5' LTR, suggesting that this telomere was generated by a transposition event of MGLR-3 into this Pot2 element, causing the breakage of a chromosome. The subsequent addition of a telomeric repeat to the 3' LTR of MGLR-3 most probably repaired the broken end of the chromosome. Mg-SINE is located 25 bp away from the truncated Pot2 element. MGLR-3 exhibited strong homology to various gypsy-class retrotransposons, including grh and MAGGY in M. grisea. MGLR-3 is ubiquitous regardless of the host of origin.

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