Nucleic Acids Research, 1983, Vol. 11, No. 10 2979-2997
© 1983
MOLECULAR BIOLOGY |
VlteBogtnin B2 gene in Xenopus laevis: Isolation, in vitro transcription and relation to other vitellogenin genes
*Institut de Biologie animale, Universiteède Lsausanee, Palais de Rurnine Ch-1005 Lausanne +Abteilung fur Zell-und Entwicklungsbiologie, Universitat Bern Baltzerstrasse 4, CH-3012
Received March 30, 1983. Accepted April 27, 1983.
The isolation of the four Xenopus laevis vitellogenin genes has been completed by the purification from a DNA library of the B2 gene together with its flanking sequences. The overlapping DNA fragments analyzed cover 34 kilobases. The B2 gene which has a length of 17.5 kilobases was charxacterized by heteroduplex and R-loop mapping 1n the electron microscope and by in vitro transcription 1n a HeLa whole-cell extract. Its structural organization is compared with that of the closely related Bl gene. The mRNA-coding sequence of about 6 kilobases 1s interrupted 34 times in the Bl gene and 33 times in the B2 gene. Sequence homology between the two genes was not only found in exons. In addition, 54% of the intron sequences as well as 6356 and 48.5% respectively of the 5' and 3' flanking sequences, show enough homology to form stable duplexes. These findings are compared with earlier results obtained with the two other closely related members of the vitellogenin gene family, the Al and the A2 genes
1Present address: Institute National de la santeè et de la Recherche Meèdicale (U 148), 60, Rue de Navacelles, F-34100 Montpellier, France.
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