Dual-function stem molecular beacons to assess mRNA expression in AT-rich transcripts of Plasmodium falciparum

Biotechniques. 2004 Mar;36(3):488-92, 494. doi: 10.2144/04363RN04.

Abstract

The genome of the human malaria parasite Plasmodium falciparum is extremely AT-rich such that it is particularly difficult to design standard probes to identify and quantify specific transcripts. Biased AT genome contents (70%-80%) lead to a high proportion of short repetitions and a low free energy of binding between target sequences and their specific probes during hybridization. This causes nonspecific annealing and high background noise. We constructed molecular beacon probes with dual-function stems to avoid nonspecific detection and establish identical melting patterns for use with several fluorescent probes for the analysis of mRNA expression in P. falciparum in real-time reverse transcription PCR (RT-PCR) assays. The method proved highly efficient at detecting low transcript levels in P. falciparum microcultures. Conditions were established for two types of real-time instruments, demonstrating that molecular beacons with dual-function stems are a useful tool for the functional analysis of high AT genomes. The procedure could be adapted to high-throughput gene expression protocols for the biomolecular screening of the P. falciparum and other AT-rich genomes.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • AT Rich Sequence / genetics
  • Animals
  • Gene Expression Profiling / methods*
  • Online Systems
  • Plasmodium falciparum / genetics*
  • Plasmodium falciparum / metabolism*
  • RNA Probes / genetics*
  • RNA, Messenger / analysis
  • RNA, Messenger / genetics*
  • RNA, Messenger / metabolism*
  • Reverse Transcriptase Polymerase Chain Reaction / methods*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism

Substances

  • RNA Probes
  • RNA, Messenger
  • Transcription Factors