Abstract

The primed in situ DNA labelling (PRINS) procedure was optimised for the rapid physical mapping of several types of repetitive DNA sequences on the mitotic chromosomes of Vicia faba, Pisum sativum and Secale cereale. A localization of the highly repeated FokI sequence on V. faba chromosomes was achieved after a 7-min total reaction time. In addition, we report a procedure for direct cycling-PRINS (C-PRINS), a variation of PRINS which involves a sequence of thermal cycles analogous to the polymerase chain reaction. Compared to PRINS, C-PRINS was more sensitive. Further work is needed to improve the sensitivity of the reaction to allow for the reliable detection of low-copy DNA sequences.

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