Linked Life Data

11746562

Source:http://linkedlifedata.com/resource/pubmed/id/11746562

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2001-12-17
pubmed:abstractText
Although developmental variation in activity and inducibility is typical of cytochrome P450 monooxygenases (P450s) in insects, the adaptive significance of such variation is often unclear, in part because the natural function of insect P450s is rarely known. In this study, we examined developmental variation in expression of CYP6B1 and CYP6B3 in Papilio polyxenes, the black swallowtail. Enzymes encoded by these genes have been implicated in the metabolism of xanthotoxin, a furanocoumarin characteristic of the apiaceous hostplants of P. polyxenes. In each life stage-egg, five larval instars, pupa, and adult-we examined individuals exposed to foliage with and without supplemental xanthotoxin. For each stage, we conducted enzyme assays to estimate xanthotoxin metabolism, Northern analysis to detect constitutive and induced mRNA levels, and RT-PCR amplification and Southern analysis to differentiate among P450 genes expressed. Inducible xanthotoxin metabolism, previously reported in fifth instars, was observed in four of five larval stages but was absent or undetectable in all stages that do not feed on foliage; the highest levels of activity were in early larval instars. The same pattern was observed in both Northern and RT-PCR gel blot analyses. In inducible larval stages, inducibility of CYP6B1 transcripts by xanthotoxin was greater than the inducibility of CYP6B3 transcripts. These findings support earlier suggestions that these two P450s contribute to xanthotoxin metabolism in this species and that expression of these P450 genes is regulated in an adaptive fashion with respect to probability of exposure to hostplant toxins over the course of development.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0739-4462
pubmed:author
pubmed:copyrightInfo
Copyright 2001 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:volume
48
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
179-89
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:11746562-Animals, pubmed-meshheading:11746562-Blotting, Northern, pubmed-meshheading:11746562-Blotting, Southern, pubmed-meshheading:11746562-Butterflies, pubmed-meshheading:11746562-Coumarins, pubmed-meshheading:11746562-Cytochrome P-450 Enzyme System, pubmed-meshheading:11746562-DNA, Plant, pubmed-meshheading:11746562-Enzyme Induction, pubmed-meshheading:11746562-Female, pubmed-meshheading:11746562-Gene Expression Regulation, Developmental, pubmed-meshheading:11746562-Gene Expression Regulation, Enzymologic, pubmed-meshheading:11746562-Methoxsalen, pubmed-meshheading:11746562-Plant Leaves, pubmed-meshheading:11746562-RNA, Messenger, pubmed-meshheading:11746562-RNA, Plant, pubmed-meshheading:11746562-Reverse Transcriptase Polymerase Chain Reaction, pubmed-meshheading:11746562-Steroid Hydroxylases
pubmed:year
2001
pubmed:articleTitle
Developmental variation in cytochrome P450 expression in Papilio polyxenes in response to xanthotoxin, a hostplant allelochemical.
pubmed:affiliation
Department of Entomology, University of Illinois, Urbana, Illinois 61801, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't