An efficient strategy for cloning 5′ extremities of rare transcripts permits isolation of multiple 5′-untransiated regions of rat tryptophan hydroxylase mRNA

Abstract

The 5'' end mapping of rat tryptophan hydroxylase (TPH) mRNA indicated a diversity in 5''-untranslated regions. Corresponding sequences were isolated by a variant of the Polymerse Chain Reaction, recently designed as ''anchor PCR'', and a ''cRNA enrichment'' procedure. The latter circumvents the limitations of ''anchor PCR'', which failed to yield minor TPH sequences: this novel strategy allows purification of specific DNA fragments by elimination of the unspecific products, generated by the PCR, which prevent further amplification. Analysis of TPH sequences strongly suggests that TPH mRNAs are synthesized from at least two promoters, the proximal one exhibiting two ''CCAAT homologies''.