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The Journal of Heredity 1996:87(3):191-198
© 1996 The American Genetic Association 87:191-198

research-article

Genomic Distribution of P Elements in Drosophila willistoni and a Search for Their Relationship With Chromosomal Inversions

L. P. Regner, M. S. O. Pereira, C. E. V. Alonso, E. Abdelhay, and V. L. S. Valente

From the Departamento de Genética, Instituto de Biocienclas, Universidade Federal do Rlo Grande do Sul P.O. Box 15053, CEP 91501-970

Corresponding Editor: Ross Macintyre

Abstract

According to the recent-invasion hypothesis, Drosophila melanogaster may have acquired its P elements in a fairly recent process of horizontal transmission between species. Drosophila willistoni has been identified as the potential donor species in that transfer process. A most remarkable feature of D. willistoni is its extensive chromosomal polymorphism due to inversions—the adaptiveness of which has been the subject of many classical studies on evolutionary genetics. In this article, we further extend the study of P elements in D. willistoni, focusing on the possible role they may play in the generation of chromosomal inversions. Our results may be summarized as follows. P-homologous sequences were detected in South American populations of D. willistoni. In two of them, a recently collected wild population and an old laboratory stock, the P insertion sites were located in the polytene chromosomes. Several hybridization sites were mapped in all major chromosome arms of the natural population, which was also chromosomally polymorphic; in the laboratory population, nearly devold of inversions, hybridization sites were found to be confined to the chromocenter. In the wild population, 10 of the 24 P hybridized sites coincided with several inversions break points and another five sites located themselves very close to those points. The results are discussed within the context of evolutionary hypotheses.


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