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Nucleic Acids Research, 1985, Vol. 13, No. 19 7129-7138
© 1985

Articles

The nucleotide sequence of a nematode vitellogenin gene

John Spieth, Karen Denison, Erin Zucker and Thomas Blumenthal

Program in Molecular, Cellular and Developmental Biology, and Department of Biology, Indiana University Bloomington, IN 47405, USA

Received August 12, 1985. Accepted September 4, 1985.

The nematode, Caenorhabditis elegans, contains a family of six genes that code for vitellogenins. Here we report the complete nucleotide sequence of one of these genes, vit-5. The gene specifies a mRNA of 4869 nucleotides, including untranslated regions of 9 bases at the 5' end and 51 bases at the 3' end. Vit-5 contains four short introns totalling 218 bp. The predicted vitellogenin, yp170A, has a molecular weight of 186,430. At its N terminus it is clearly related to the vitellogenins of vertebrates. However, the vit-5-encoded protein does not contain a serine-rich sequence related to the vertebrate vitellin, phosvitin. In fact, the amino acid composition of the nematode protein is very similar to that of the vertebrate protein without phosvitin. Vit-5 has a highly asymmetric codon choice dictionary. The favored codons are different from those favored in other organisms, but are characteristic of highly expressed C. elegans genes. The strong selection against rare codons is not as great near the 5' end of the gene; rare codons are 15 times more frequent within the first 54 bp than in the next 4.8 kb.


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[Abstract] [Full Text] [PDF]


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