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Nucleic Acids Research, 1990, Vol. 18, No. 16 4665-4670
© 1990

Articles

Coding potential of transfected human placental lactogen genes

Diana Reséndez-Pérez, Ramiro Ramírez-solís, Alfredo Varela-Echavarría, Herminia G. Martínez-Rodríguez and Hugo A. Barrera-Saldana*

Unidad de Laboratories de Ingenieria y Expresión Genticas, Departamento de Bioquímica, Facultad de Medicina de la Universidad Autónoma de Nuevo León Monterrey, NL, Mexico

*To whom correspondence should be addressed

Received June 28, 1990. Revised July 16, 1990. Accepted July 16, 1990.

We have joined the promoter-less sequences of the three hPL genes (hPL-1, hPL-3 and hPL-4) to strong transcriptional control elements, in vivo 35S-labeled proteins from the culture medium of cells transfected with the genes were resolved on SDS-polyacrylamide gels. The presence of characteristic labeled bands, visualized by autoradiography, determined that hPL-4 and hPL-3, but not hPL-1, contribute to the production of mature hPL. In these experiments hPL-3 expressed more RNA and protein than hPL-4. By exchanging the first two exons among hPL and hGH genes, we determined that the abundance of chimeric proteins depended on the genetic origin of the first two exons. Finally, we found evidence indicating that the splice mutation (G->A) at the beginning of the second intron of hPL-1, is not the only cause of the apparent lack of inactivity of this gene, since its reversion does not restore expression.


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