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Nucleic Acids Research, 1983, Vol. 11, No. 22 7701-7716
© 1983

MOLECULAR BIOLOGY

Scattering of repetitive DNA sequences in the albumin and vitellogenin gene loci of Xenopus laevis

Gerhart U. Ryffel*, Daniel B. Muellener*, Susan Gerber-Huber*, Toni Wyler* and Walter Wahli+

*Abteilung für Zell- und Entwicklungsbiologie, Zoologisches Institut, Universität Bern Baltzerstrasse 4, CH-3012 Bern +Institut de Biologie Animale, Université de Lausanne, Bätiment de Biologie CH-1015 Lausanne, Switzerland

Received September 28, 1983. Accepted October 26, 1983.

We have analyzed middle repetitive DNA in the albumin and vitellogenin gene families of Xenopus laevis. Mapping specific repetitive DNA sequences derived from introns of the Al vitellogenin gene reveals that these sequences are scattered within and around the four vitellogenin genes (Al, A2, Bl and B2) and the two albumin genes (74 kd and 68 kd). Three repetitive DNA elements present 1n the Al vitellogenin transcriptional unit are also located in introns of the 74 kd albumin gene. This apparently random distribution of middle repetitive DNA in the two gene families suggests that the analyzed sequences are not Involved in gene regulation, but rather that they might represent unstable genetic elements. This hypothesis is further supported by the finding that size polymorphism in the Al vitellogenin gene and in the 74 kd albumin gene is correlated with the presence or absence of repetitive DNA.


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