Cloning and expression of a cDNA encoding a mouse brain orphanin FQ/nociceptin precursor

Ying Xian Pan, Jin Xu, Gavril W. Pasternak

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By using a reverse transcription-PCR approach we have cloned a peptide precursor from mouse brain which contains the sequence of orphanin FQ/nociceptin. The mouse sequence of orphanin FQ/nociceptin is identical at the amino acid level with that isolated from rat and porcine brain. Northern analysis of the mRNA encoding the precursor reveals a single band of approx. 1 kb, with the highest levels in the brain and much lower levels in kidney and spleen. Southern analysis is consistent with a single gene. The precursor peptide from mouse contains two other putative peptides. Upstream from the orphanin FQ/nociceptin is a 41-amino-acid peptide which is almost identical, except for a six-amino-acid insertion, with the corresponding 35-amino-acid peptide predicted from the rat sequence. Interestingly, the mouse contains a triple AEPGAD repeat within this peptide that is not seen in the rat sequence. Downstream from the orphanin FQ/nociceptin sequence is another 17-amino-acid peptide which is identical with that found in the rat.

Original languageEnglish (US)
Pages (from-to)11-13
Number of pages3
JournalBiochemical Journal
Issue number1
StatePublished - Apr 1 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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