Targeted Gene Replacement in Drosophila Via P Element-Induced Gap Repair

作者：Gregory Brian Gloor, Nadine A. Nassif, Dena M. Johnson-Schlitz, Christine R Preston, William R. Engels · 发表于：Science · 年份：1991 · DOI：10.1126/science.1653452 · 被引用次数：353 · 研究领域：Chromosomal and Genetic Variations、RNA modifications and cancer、RNA Research and Splicing

Transposable elements of the P family in Drosophila are thought to transpose by a cut-and-paste process that leaves a double-strand gap. The repair of such gaps resulted in the transfer of up to several kilobase pairs of information from a homologous template sequence to the site of P element excision by a process similar to gene conversion. The template was an in vitro-modified sequence that was tested at various genomic positions. Characterization of 123 conversion tracts provided a detailed description of their length and distribution. Most events were continuous conversion tracts that overlapped the P insertion site without concomitant conversion of the template. The average conversion tract was 1379 base pairs, and the distribution of tract lengths fit a simple model of gap enlargement. The conversion events occurred at sufficiently high frequencies to form the basis of an efficient means of directed gene replacement.