Obesity Surgery

, Volume 21, Issue 8, pp 1257–1264

Pilot Study Examining the Frequency of Several Gene Polymorphisms Involved in Morphine Pharmacodynamics and Pharmacokinetics in a Morbidly Obese Population

  • Célia Lloret Linares
  • Aline Hajj
  • Christine Poitou
  • Guy Simoneau
  • Karine Clement
  • Jean Louis Laplanche
  • Jean-Pierre Lépine
  • Jean François Bergmann
  • Stéphane Mouly
  • Katell Peoc’h
Clinical Report


Morbidly obese patients are at significantly elevated risk of postsurgery complications and merit closer monitoring by health care professionals after bariatric surgery. It is now recognized that genetic factors influence individual patient’s response to drug used in anesthesia and analgesia. Among the many drug administered by anesthetists, we focused in this pilot study on morphine, since morphine patient-controlled anesthesia in obese patients undergoing gastric bypass surgery is frequently prescribed. We examined the allelic frequency of three polymorphisms involved in morphine pharmacodynamics and pharmacokinetics in patients with body mass index (BMI) >40. One hundred and nine morbidly obese patients (BMI = 49.1 ± 7.7 kg/m²) were genotyped for three polymorphisms c.A118G of mu opioid receptor (OPRM1), c.C3435T of the P-glycoprotein gene (ABCB1), and p.Val158Met of catechol-O-methyltransferase gene (COMT). Allelic frequencies were 118G—0.22, C3435—0.55, and 158Met—0.5 in our whole population and 0.23, 0.5, and 0.47 in Caucasian population. Allelic frequencies did not differ according to gender. Mean BMI did no differ according to the allelic variant. OPRM1118G allele was more frequent in our population than in most previously described European populations. Since the concept of “personalized medicine” promises to individualize therapeutics and optimize medical treatment in term of efficacy and safety, especially when prescribing drugs with a narrow therapeutic index such as morphine, further clinical studies examining the clinical consequences of the OPRM1 c.A118G polymorphism in patients undergoing gastric bypass surgery are needed.


Morphine Pharmacogenetics Obesity OPRM1 ABCB1 COMT Analgesia 

List of abbreviations


ATP-binding cassette, subfamily B, member 1


body mass index


catechol-O-methyltransferase (enzyme and gene)


deoxyribonucleic acid


ethylenediaminetetraacetic acid




monoamine oxydase A


monoamine oxydase B


mu opioid receptor


mu opioid receptor gene




single nucleotide polymorphism


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Copyright information

© Springer Science + Business Media, LLC 2010

Authors and Affiliations

  • Célia Lloret Linares
    • 1
    • 2
  • Aline Hajj
    • 3
    • 4
  • Christine Poitou
    • 1
    • 5
  • Guy Simoneau
    • 2
  • Karine Clement
    • 1
    • 5
  • Jean Louis Laplanche
    • 3
    • 4
  • Jean-Pierre Lépine
    • 3
  • Jean François Bergmann
    • 2
  • Stéphane Mouly
    • 2
    • 3
  • Katell Peoc’h
    • 3
    • 4
    • 6
  1. 1.Department of Nutrition and EndocrinologyAssistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière HospitalParisFrance
  2. 2.Department of Internal MedicineAssistance Publique-Hôpitaux de Paris, Hôpital Lariboisière, Unit of Therapeutic ResearchParis Cedex 10France
  3. 3.Institut National de la Santé et de la Recherche Médicale U705, Centre National de la Recherche Scientifique UMR 7157, Faculty of PharmacyParis-Cité Descartes UniversityParisFrance
  4. 4.Department of Biochemistry and Molecular BiologyAssistance Publique-Hôpitaux de Paris, Hôpital LariboisièreParis Cedex 10France
  5. 5.Institut National de la Santé et de la Recherche Médicale, U872 team7, Nutriomique, Cordelier Research CenterParisFrance
  6. 6.Hôpital Lariboisière, Service de Biochimie et Biologie MoléculaireParisFrance

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