Abstract
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 characterized by heteroduplex and R-loop mapping in the electron microscope and by in vitro transcription in a HeLa whole-cell extract. Its structural organization is compared with that of the closely related B1 gene. The mRNA-coding sequence of about 6 kilobases is interrupted 34 times in the B1 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 63% 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 A1 and the A2 genes.
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