Organization and distribution pattern of MGLR-3, a novel retrotransposon in the rice blast fungus Magnaporthe grisea

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


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.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Ascomycota / genetics*
  • Ascomycota / isolation & purification
  • Ascomycota / pathogenicity
  • DNA, Fungal / genetics*
  • Genetic Variation
  • Molecular Sequence Data
  • Oryza / microbiology
  • Phylogeny
  • Retroelements / genetics*
  • Terminal Repeat Sequences


  • DNA, Fungal
  • Retroelements