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Eclosion hormone (EH) is a 62-amino acid neuropeptide that initiates the ecdysis behavior of insects. The EH-encoding gene of the tobacco hornworm, Manduca sexta, was isolated by using a designed 72-mer oligonucleotide probe. Sequence analysis of this gene and its corresponding cDNA showed that the EH gene is 7.8 kilobases and consists of three exons. Exon I is totally nontranslated; exon II contains a 26-amino acid signal peptide and amino acids 1-4 of the EH peptide, and exon III encodes the remainder of the peptide. The EH gene is present in a single copy per haploid genome and transcribes an 0.8-kb mRNA that is expressed in larval, diapausing pupal, and developing adult brains but not in the ventral nerve cord or in nonneural tissues. In situ hybridization showed that the EH gene is expressed in two pairs of ventromedial neurosecretory cells in brains of both larvae and developing adults.

Isolation and expression of the eclosion hormone gene from the tobacco hornworm, Manduca sexta.