Gene 1988 Apr 15;641:77-85.

Complete synthesis and transcription in vitro of a gene coding for human ribosomal 5S RNA.

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The gene coding for the major human ribosomal 5S RNA was chemically synthesized and cloned into a pUC13 vector. This approach was taken, because attempts to isolate the human 5S gene have thus far yielded either pseudogenes or variant 5S genes of unknown function. The synthetic human gene was transcribed by RNA polymerase III either in a crude HeLa cell extract or in a system reconstituted from partially purified transcription factors. Comparative studies with the Xenopus laevis somatic 5S gene show that the human gene is transcribed with similar fidelity and an efficiency of about 80% under optimal conditions. The time-course of transcription and optimal concentrations of template and transcription factors were found to be similar for both genes studied. The synthetic gene described may prove useful to study its interaction with human transcription factors in a homologous system.

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