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Nucleic Acids Research, 1995, Vol. 23, No. 11 1901-1911
© 1995

GENOME STRUCTURE AND MAPPING

Chromosomal mapping of the MADS-box multigene family in Zea mays reveals dispersed distribution of allelic genes as well as transposed copies

Achim Fischer, Nikolai Baum, Heinz Saedler and Günter Theiβen*

Max-Planck-lnstitut fur Züchtungsforschung, Abteilung Molekulare Pflanzengenetik Carl-von-Linné-Weg 10, D-50829 Köln, Germany

* To whom correspondence should be addressed

Received February 28, 1995. Revised April 20, 1995. Accepted April 20, 1995.

A linker PCR procedure has been developed for preparing repetitive DNA-free probes from genomlc clones, which is especially efficient for members of gene families. Using this procedure as well as standard methods to prepare hybridization probes, chromosomal map positions of MADS-box genes were determined In recombinant inbred lines of maize (Zea mays ssp. mays). It appears that MADS-box genes are scattered throughout the maize genome. While there Is evidence that this genomlc distribution is representative for plant MADS-box genes in general, the following two other observations probably reflect Zea genome organization. First, at least one family of MADS-box-carrylng elements contains line-specific versions, which are present In some maize lines at certain chromosomal positions, but are absent from these loci in other lines. The members of this family resemble transposable elements In some respects. Secondly, the finding of pairs of highly related MADS-box genes which are accompanied by other duplicated markers Is a further indication of the ancestral polyploid genome constitution revealed with other markers. The importance of these findings for an understanding of the genomic organization of MADS-box genes and the evolution of the MADS-box gene family Is discussed.


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