A novel non-synonymous mutation in the melanocortin-4 receptor gene (MC4R) in a 2-year-old Austrian girl with extreme obesity

被引:23
作者
Rettenbacher, E.
Tarnow, P.
Brumm, H.
Prayer, D.
Wermter, A. -K.
Hebebrand, J.
Biebermann, H.
Hinney, A.
Widhalm, K.
机构
[1] Univ Duisburg, Rhein Klin Essen, Dept Child & Adolescent Psychiat, Essen, Germany
[2] Med Univ Vienna, Dept Paediat, Div Nutr & Metab, Vienna, Austria
[3] Humboldt Univ, Charite, Childrens Hosp, Berlin, Germany
[4] Med Univ Vienna, Div Neuroradiol, Dept Radiol, Vienna, Austria
[5] Univ Marburg, Dept Child & Adolescent Psychiat, Marburg, Germany
关键词
obesity; G proteins; signal transcluction; obesity melanocortin receptors;
D O I
10.1055/s-2007-949150
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background: Functionally relevant mutations in the melanocortin-4 receptor gene (MC4R) currently display the most common major gene/allele effect on extreme obesity. Objective: Mutation screen of the MC4R in consecutively ascertained Austrian children and adolescents with severe obesity, to analyse the phenotype of mutation carriers and to functionally characterise novel mutations. Subjects and Methods: 102 unrelated extremely obese children and adolescents (mean BMI 33.5 +/- 7.1 kg/m(2), > 97th centile; mean age 13.8 +/- 4.1yr) and 109 parents (79 mothers/30 fathers) of 88 of these patients were studied. The MC4P coding region was screened using denaturing high-performance liquid chromatography (dHPLC) PCR products of aberrant dHPLC pattern were re-sequenced. Signal transduction properties of mutant MC4R was investigated by challenge with the highly potent agonist NDP-alpha-MSH. Cell surface expression was determined by ELISA. Magnetic resonance imaging (MRI) of the central nervous system (CNS) was applied to a 2.3 year old index patient. Body fat and bone mineral content were assessed in three of the five mutation carriers by dual energy x-ray absorptiometry (DEXA). Oral glucose tolerance test (OGTT) was applied to some mutation carriers. Results: Heterozygous carriers of two non-synonymous mutations, two polymorphisms and a silent variation were identified within the study group. (1) A novel MC4P non-synonymous mutation (S136F) was detected in a 2.3 year old girl with extreme obesity (BMI 33.2 kg/m(2), > 99th centile); (2) a previously described non-synonymous mutation (V253I) was identified in an obese mother (BMI 28.1 kg/m(2)) who did not transmit this mutation to her extremely obese son; (3) two known polymorphisms (V103I and I251L) were also identified; and (4) one obese mother was carrier of a silent variation (c.594C > T; 1198). Co-segregation of S136F with the obesity phenotype was shown for three generations. In vitro functional studies revealed a complete loss of signal transduction activity of the mutant receptor while cell surface expression was only slightly reduced compared to the wild-type receptor. Conclusions: We detected a novel non-synonymous mutation (S136F) that leads to a complete loss of MC4R function in vitro.
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页码:7 / 12
页数:6
相关论文
共 47 条
[1]  
ARCHARYA S, 1996, J BIOL CHEM, V271, P25406
[2]   A conserved tyrosine residue (Y601) in transmembrane domain 5 of the human thyrotropin receptor serves as a molecular switch to determine G-protein coupling [J].
Biebermann, H ;
Schöneberg, T ;
Schulz, A ;
Krause, G ;
Grüters, A ;
Schultz, G ;
Gudermann, T .
FASEB JOURNAL, 1998, 12 (14) :1461-1471
[3]   Large quantitative effect of melanocortin-4 receptor gene mutations on body mass index [J].
Dempfle, A ;
Hinney, A ;
Heinzel-Gutenbrunner, M ;
Raab, M ;
Geller, F ;
Gudermann, T ;
Schäfer, H ;
Hebebrand, J .
JOURNAL OF MEDICAL GENETICS, 2004, 41 (10) :795-800
[4]   Mutational analysis of melanocortin-4 receptor, agouti-related protein, and α-melanocyte-stimulating hormone genes in severely obese children [J].
Dubern, B ;
Clément, K ;
Pelloux, V ;
Froguel, P ;
Girardet, JP ;
Guy-Grand, B ;
Tounian, P .
JOURNAL OF PEDIATRICS, 2001, 139 (02) :204-209
[5]   Role of melanocortinergic neurons in feeding and the agouti obesity syndrome [J].
Fan, W ;
Boston, BA ;
Kesterson, RA ;
Hruby, VJ ;
Cone, RD .
NATURE, 1997, 385 (6612) :165-168
[6]   Dominant and recessive inheritance of morbid obesity associated with melanocortin 4 receptor deficiency [J].
Farooqi, IS ;
Yeo, GSH ;
Keogh, JM ;
Aminian, S ;
Jebb, SA ;
Butler, G ;
Cheetham, T ;
O'Rahilly, S .
JOURNAL OF CLINICAL INVESTIGATION, 2000, 106 (02) :271-279
[7]   Clinical spectrum of obesity and mutations in the melanocortin 4 receptor gene [J].
Farooqi, IS ;
Keogh, JM ;
Yeo, GSH ;
Lank, EJ ;
Cheetham, T ;
O'Rahilly, S .
NEW ENGLAND JOURNAL OF MEDICINE, 2003, 348 (12) :1085-1095
[8]  
GANTZ I, 1993, J BIOL CHEM, V268, P15174
[9]   Melanocortin-4 receptor gene variant I103 is negatively associated with obesity [J].
Geller, F ;
Reichwald, K ;
Dempfle, A ;
Illig, T ;
Vollmert, C ;
Herpertz, S ;
Siffert, W ;
Platzer, M ;
Hess, C ;
Gudermann, T ;
Biebermann, H ;
Wichmann, HE ;
Schäfer, H ;
Hinney, A ;
Hebebrand, J .
AMERICAN JOURNAL OF HUMAN GENETICS, 2004, 74 (03) :572-581
[10]   Obesity-associated mutations in the melanocortin 4 receptor provide novel insights into its function [J].
Govaerts, C ;
Srinivasan, S ;
Shapiro, A ;
Zhang, SM ;
Picard, F ;
Clement, K ;
Lubrano-Berthelier, C ;
Vaisse, C .
PEPTIDES, 2005, 26 (10) :1909-1919