Cloning of a beta1 tubulin cDNA from an insect endocrine gland: developmental and hormone-induced changes in mRNA expression.
A rapid increase in ecdysteroid hormone synthesis results when the insect prothoracic gland is stimulated with prothoracicotropic hormone (PTTH), a brain neuropeptide hormone. PTTH also stimulates the specific synthesis of several proteins, one of which is a beta tubulin. To further understand the possible roles of beta tubulin in the prothoracic gland, beta tubulin cDNA clones were isolated from a tobacco hornworm (Manduca sexta) gland cDNA library. Sequence analysis indicated that these clones were assignable to the beta1 tubulin isoform. Gland beta1 tubulin mRNA levels during the last larval instar and early pupal-adult development exhibited peaks that coincided with peaks in ecdysteroid synthesis. Manipulations of the glands hormonal milieu showed that beta1 tubulin mRNA levels respond to 20 hydroxyecdysone and PTTH. The data also support our earlier proposal that the prothoracic gland beta1 tubulin gene is ubiquitously expressed but exhibits tissue- and developmental-specific regulation of transcription and translation.
Rybczynski
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Department of Biology, University of North Carolina at Chapel Hill, 27599, USA. rybczy.wilson@mhs.unc.edu
Gilbert
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D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D015153:Blotting, Western; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification; D004441:Ecdysterone / Q000494:pharmacology; D004702:Endocrine Glands / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology; D005786:Gene Expression Regulation; D015723:Gene Library; D007301:Insect Hormones / Q000494:pharmacology*; D019476:Insect Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D018402:Manduca / Q000235:genetics* / Q000254:growth & development; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014404:Tubulin / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
D018076:DNA, Complementary; D005231:Fatty Acids, Unsaturated; D007301:Insect Hormones; D019476:Insect Proteins; D014404:Tubulin; C115276:beta1 tubulin protein, Manduca; C006481:ethyl-3,7,11-trimethyl-2,4-dodecadienoate; D004441:Ecdysterone; C009089:prothoracicotropic hormone