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Genetic structure of a natural population of Dictyostelium discoideum , a cellular slime mould
Author(s) -
FRANCIS D.,
EISENBERG R.
Publication year - 1993
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.1993.tb00031.x
Subject(s) - dictyostelium discoideum , biology , genetics , linkage disequilibrium , population , slime mold , dictyostelium , gene , genetic structure , transposable element , gene flow , genotype , genetic variation , haplotype , botany , genome , demography , sociology
Dictyostelium discoideum is a eukaryotic microbe feeding on soil bacteria. A first step towards describing the genetic structure of populations of this species was made by examining multiple isolates from a single locale. The isolates were grown clonally and their RFLP patterns compared, using a probe specific for a family of tRNA genes. Thirty‐nine types were distinguished in 54 isolates. To determine if genetic exchange occurs among members of the population, an analysis of linkage disequilibrium was performed on the RFLP data. Little disequilibrium was found, implying gene flow in the population. In conflict with this result is the finding that no recombinant progeny were recovered from many attempted crosses between pairs of isolates. The tentative conclusion is that genetic exchange does not in fact occur, and that the observed shuffling of RFLP bands is caused by insertion and excision of transposons known to be associated with the tRNA genes of Dictyostelium.