A repetitive DNA sequence associated with karyotype variability in Fusarium poae

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Abstract

A moderately repetitive DNA element has been cloned from Fusarium poae a strictly asexual fungus, which is frequently occurring secondary invader of small-grain cereals. The element, named ZIT1 selectively hybridised to the polymorphic, 1.0-3.7 Mb chromosomal region of the fungus, but no hybridisation signal was observed on any of the large chromosomes. Nucleotide sequence analysis indicated that ZIT1 shares only a moderate level of similarity to gag genes of fungal retrotransposons which was mainly due to a small cysteine-reach motif, known as zinc-finger DNA binding domain. No significant homology was found with any other published nucleotide sequence. The coincidence of the polymorphic chromosome region and the chromosomal distribution of ZIT1 in several strains of F. poae suggests that this repeat, that could be a remnant of a formerly active element still may generate chromosome rearrangements through recombination among its scattered homologous sequences.

Original languageEnglish
Pages (from-to)29-38
Number of pages10
JournalActa Phytopathologica et Entomologica Hungarica
Volume32
Issue number1-2
Publication statusPublished - 1997

Fingerprint

Fusarium poae
karyotyping
chromosomes
nucleotide sequences
fungi
zinc finger motif
retrotransposons
sequence homology
cysteine
small cereal grains
hybridization
sequence analysis
DNA
genes

ASJC Scopus subject areas

  • Insect Science
  • Plant Science

Cite this

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title = "A repetitive DNA sequence associated with karyotype variability in Fusarium poae",
abstract = "A moderately repetitive DNA element has been cloned from Fusarium poae a strictly asexual fungus, which is frequently occurring secondary invader of small-grain cereals. The element, named ZIT1 selectively hybridised to the polymorphic, 1.0-3.7 Mb chromosomal region of the fungus, but no hybridisation signal was observed on any of the large chromosomes. Nucleotide sequence analysis indicated that ZIT1 shares only a moderate level of similarity to gag genes of fungal retrotransposons which was mainly due to a small cysteine-reach motif, known as zinc-finger DNA binding domain. No significant homology was found with any other published nucleotide sequence. The coincidence of the polymorphic chromosome region and the chromosomal distribution of ZIT1 in several strains of F. poae suggests that this repeat, that could be a remnant of a formerly active element still may generate chromosome rearrangements through recombination among its scattered homologous sequences.",
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