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Nucleic Acids Research, 1983, Vol. 11, No. 8 2313-2323
© 1983

MOLECULAR BIOLOGY

Chromosomal mapping of Xenopus 5S genes: somatic-type versus oocyte-type

Mary E. Harper, Jennifer Price+ and Laurence Jay Korn+

The Agouron Institute 505 Coast Boulevard South, La Jolla, CA 9203 +Department of Genetics, Stanford University School of Medicine Stanford, CA 94305, USA

Received February 24, 1983. Accepted March 17, 1983.

Xenopus 5S RNA genes exhibit a pattern of differential expression during development in which some members (oocyte-type) are transcribed only in oocytes, while others (somatic-type) are expressed in both oocytes and somatic cells. Using cloned DNA probes specific for each gene type, we determined the positions of these genes on Xenopus metaphase chromosomes by in situ hybridization. Somatic-type 5S genes in both X. laevis and X. borealis are located at the distal end of the long arm of only one chromosome (number 9). The oocyte-type 5S RNA genes are found at the distal ends of the long arms of most Xenopus chromosomes, including chromosome 9. Thus, large scale differences in chromosomal location cannot explain the selective expression of these genes, as suggested previously.


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