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Nucleic Acids Research, 1981, Vol. 9, No. 5 1069-1086
© 1981

MOLECULAR BIOLOGY

Xenopus laevis ribosomal protein genes: isolation of recombinant cDNA clones and study of the genomic organization

Irene Bozzoni, Elena Beccari, Zhong Xun Luo*, Francesco Amaldi, Paola Pierandrei-Amaldi and Nadia Campioni

Centro Acidi Nucleici C.N.R., Istituto di Fisiologia Generale, Università degli Studi Roma Laboratorio di Biologia Cellulare C.N.R. via Romagnosi 18/A, Roma, Italy

Received December 31, 1980.

Poly-A+ mRNA from Xenopus laevis oocytes, partially enriched for r-protein coding capacity has been used as starting material for preparing a cDNA bank in plasmid pBR322. The clones containing sequences specific for r-proteins have been selected by translation of the complementary mRNAs. Clones for six different r-proteins have been identified and utilized as probes for studying their genomic organization. Two gene copies per haploid genome were found for r-proteins L1, L14, S19, and four-five for protein S1, S8 and L32. Moreover a population polymorphism has been observed for the genomic regions containing sequences for r-protein S1, S8 and L14.

*On leave of absence from the Biology Department of Wuhan Teacher's College, China.


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