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J Mol Evol
1992 Jun 01;346:478-92. doi: 10.1007/bf00160462.
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The boll weevil vitellogenin gene: nucleotide sequence, structure, and evolutionary relationship to nematode and vertebrate vitellogenin genes.
Trewitt PM
,
Heilmann LJ
,
Degrugillier SS
,
Kumaran AK
.
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Boll weevil (Anthonomus grandis) eggs contain two yolk proteins, YP47 and YP160. Using anti-YP160 antiserum as probe, a partial-length complementary DNA (cDNA) was isolated from a lambda gt11 adult female cDNA library. A second partial-length cDNA was isolated from a lambda gt10 adult female cDNA library by differential screening with male vs. female cDNAs. Northern blot analysis showed that each cloned cDNA hybridized to a 6-kb female-specific transcript. These cDNAs were used to probe a genomic library, and two overlapping genomic clones were obtained that span the boll weevil vitellogenin gene. The entire transcription unit was sequenced, and introns were mapped by a combination of primer extension experiments, S1 nuclease protection experiments, and polymerase chain reaction-mediated synthesis of two additional cDNA clones. Based on these data, the vitellogenin mRNA is 5511 nucleotides [plus a poly(A) tail of undetermined length] and specifies a provitellogenin of 1790 amino acids. The deduced protein has a Glu+Gln content of 16.3%, which is a relatively high value that is typical of most vitellogenins. Protein sequence similarities including Cys clusters conserved between boll weevil vitellogenin and Xenopus laevis A2 or Caenorhabditis elegans vit-5 vitellogenins indicated that the boll weevil protein is a member of the ancient nematode-vertebrate vitellogenin family. Moreover, the six introns in the boll weevil vitellogenin gene interrupt the coding region at positions closely or exactly corresponding to a subset of the positions of the 34 vertebrate vitellogenin introns, further supporting the argument for a common evolutionary relationship. This report represents the first complete nucleotide sequence and structural analysis of a nondipteran insect vitellogenin gene.
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