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Previous Volume 333:343-347 August 10, 1995 Number 6 Next

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ABSTRACT

Background The ₃-adrenergic receptor is expressed in visceral adipose tissue and is thought to contribute to the regulation of the resting metabolic rate and lipolysis.

Methods To investigate whether mutations in the gene for the ₃-adrenergic receptor predispose patients to obesity and non-insulin-dependent diabetes mellitus (NIDDM), we studied this gene in 10 Pima Indians by analysis of single-stranded conformational polymorphisms and dideoxy sequence analysis. Association studies were performed in 642 Pima subjects (390 with NIDDM and 252 without NIDDM).

Results A missense mutation was identified in the gene for the ₃-adrenergic receptor that results in the replacement of tryptophan by arginine (Trp64Arg) in the first intracellular loop of the receptor. This mutation was detected with allelic frequencies of 0.31 in Pima Indians, 0.13 in 62 Mexican Americans, 0.12 in 49 blacks, and 0.08 in 48 whites in the United States. Among Pimas, the frequency of the Trp64Arg mutation was similar in nondiabetic and diabetic subjects. However, in subjects homozygous for the mutation the mean (±SD) age at the onset of NIDDM was significantly lower (36±10 years) than in Trp64Arg heterozygotes (40±10 years) or normal homozygotes (41±11 years; P = 0.02). Furthermore, subjects with the mutation tended to have a lower adjusted resting metabolic rate (P = 0.14 by analysis of covariance).

Conclusions Pima subjects homozygous for the Trp64Arg ₃-adrenergic–receptor mutation have an earlier onset of NIDDM and tend to have a lower resting metabolic rate. This mutation may accelerate the onset of NIDDM by altering the balance of energy metabolism in visceral adipose tissue.

Obesity is a known risk factor for the development of NIDDM^5,6 and, like NIDDM, has clear genetic determinants.^7,8 In humans, resting metabolic rate is a familial trait,^9,10 and a low resting metabolic rate is a risk factor for weight gain and obesity.^11,12 In rodents, resting metabolic rate is regulated by the sympathetic nervous system and acts through the modulation of lipolysis and thermogenesis in brown adipose tissue.^13,14 Although adult humans do not have anatomically distinct deposits of brown adipose tissue, the identification of uncoupling protein, a marker widely regarded as specific for such tissue, suggests that modulation of thermogenesis may also be important in human adipose tissue.¹⁵

The ₃-adrenergic receptor crosses the cell membrane seven times, is coupled to guanine-nucleotide–binding (G) proteins, and is localized in adipose tissue. Stimulation of the receptor by -adrenergic agonists activates adenylate cyclase, which increases intracellular concentrations of cyclic AMP (cAMP) and results in increased lipolysis and thermogenesis.^16,17,18 There is evidence that molecular abnormalities in the ₃-adrenergic receptor may lead to obesity and NIDDM. Expression of the receptor is markedly decreased in rodent models of obesity^19,20; mice with knockout (disruption) of the gene for the receptor have marked reductions in lipolysis stimulated by -agonists,²¹ and ₃-specific agonists have potent antiobesity and antidiabetic effects in both animals^22,23 and humans.^23,24 To examine further the potential role of inherited defects in this gene as contributors to obesity and NIDDM, we evaluated a group of Pima Indians, an ethnic group with a very high prevalence of these disorders, for the presence of mutations in the ₃-adrenergic–receptor gene.

Methods

Study Subjects

All protocols were approved by the ethics committees of the National Institute of Diabetes and Digestive and Kidney Diseases, the Indian Health Service, and the tribal council of the Gila River Indian Community and were performed after written informed consent was obtained from the subjects. The 642 subjects (390 with NIDDM and 252 without NIDDM) who participated in the main study were full-blooded Pima or Tohono O'odham Indians (or a mixture of these two closely related tribes) 35 to 87 years of age. The selection of subjects was not based on their familial relationship to any other subject or to the presence of diabetes. NIDDM was diagnosed on the basis of the classification system of the World Health Organization.²⁵ Anthropometric measurements and measurements of body composition were made by standard methods.²⁶ The relations among the ₃-adrenergic–receptor genotype, the resting metabolic rate (which was measured by indirect calorimetry with the subject in a respiratory chamber), plasma concentrations of glucose and insulin after oral glucose administration, and sensitivity to insulin (as determined by the hyperinsulinemic–euglycemic clamp technique) were studied in a separate group of 210 nondiabetic Pima Indians.^9,26 For the estimation of allelic frequencies, ₃-adrenergic–receptor genotypes were also determined in 62 Mexican Americans from San Antonio, Texas,²⁷ and in 49 blacks and 48 whites from the Baltimore metropolitan area.

Analysis of Single-Stranded Conformational Polymorphisms of the ₃-Adrenergic–Receptor Gene

Genomic DNA was prepared from leukocytes or immortalized cell lines by established methods. Genomic DNA was amplified by the polymerase chain reaction (PCR) as described elsewhere.²⁸ Ten pairs of primers were used to generate 10 overlapping PCR products encompassing the entire coding region, the 5' untranslated region, the exon–intron splice junctions, and 521 base pairs (bp) of the regulatory region of the ₃-adrenergic–receptor gene^17,20,29 (and data deposited with the National Auxiliary Publications Service, ^*). For the analysis of single-stranded conformational polymorphisms, the PCR products were radiolabeled by the addition of [-³²P]deoxycytidine triphosphate to the reaction mixture. Denatured PCR products were loaded onto a polyacrylamide gel (MDE, AT Biochemicals, Malvern, Pa.), and subjected to electrophoresis at 4 to 6 W for 18 to 20 hours under four gel conditions: with and without 10 percent glycerol at 4°C and at 25°C.³⁰ The gel was vacuum-dried, and autoradiography was performed.

Dideoxy Sequence Analysis

Variants detected by analysis of single-stranded conformational polymorphisms were subjected to direct dideoxy sequence analysis with asymmetric PCR²⁸ and Sequenase Version 2.0 kits (United States Biochemicals, Cleveland). Changes in bases were confirmed by the sequencing of the opposite strands and by digestion with restriction enzymes.

Detection of the Mutated Receptor by Hybridization with Allele-Specific Oligonucleotides

A 367-bp fragment of the ₃-adrenergic–receptor gene encompassing the mutation site was amplified by PCR with primers 5'TTCCTTCTTTCCCTACCGCCC3' and 5'GCAGCCAGTGGCGCCCAACGG3'. The PCR products were blotted in duplicate onto nylon membranes. Hybridization was accomplished with ³²P-radiolabeled oligonucleotides corresponding to either the normal sequence of the ₃-adrenergic–receptor gene (5'CATCGCCTGGACTCCGA3'; the probe for Trp64) or the sequence of the Trp64Arg ₃-adrenergic–receptor gene (5'CATCGCCCGGACTCCGA3'; the probe for Arg64).³¹ The membranes were then washed twice in 2x sodium chloride–sodium phosphate–EDTA (SSPE) (1x SSPE is 150 mM sodium chloride, 10 mM sodium phosphate, and 1.25 mM EDTA; pH 7.4) and 0.05 percent sodium dodecyl sulfate at 60°C (the Trp64 probe) or 62°C (the Arg64 probe) for 15 minutes, and autoradiography was performed.

Statistical Analysis

In the studies of the association of variables with genotype, chi-square tests were performed. In the analysis of quantitative traits, an analysis of variance was used and, where appropriate, covariates were included in the models.

Results

Analysis of Single-Stranded Conformational Polymorphisms

Ten Pima Indians with obesity and NIDDM, none of whom were first-degree relatives of each other, were initially screened for variation in the ₃-adrenergic–receptor gene. Analysis of single-stranded conformational polymorphisms revealed two variant patterns in the coding region. Dideoxy sequence analysis of one variant (present in 2 of the 10 Pimas) revealed a silent replacement of cytosine (C) by thymidine (T) at nucleotide position 381 (codon 127; i.e., ACC^ThrACT^Thr). Sequence analysis of the second variant (present in 5 of the 10 Pimas) revealed a heterozygous pattern with a replacement of thymidine (T) by cytosine (C) at nucleotide position 190 (Figure 1A and Figure 1B). This change in bases predicted a replacement of tryptophan (TGG) by arginine (CGG) at position 64 (Trp64Arg), an amino acid in the first of the three intracellular loops of the receptor (Figure 2). This change in bases was confirmed by restriction-enzyme digestion with BstNI (Figure 3A and Figure 3B). To screen for mutations that may have been missed in the analysis of single-stranded conformational polymorphisms, the entire coding region of the ₃-adrenergic–receptor gene was sequenced in two additional Pima Indians with NIDDM. No new base changes were identified.

View larger version (17K): [in this window] [in a new window]   Figure 1. Identification of the Trp64Arg Mutation of the 3-Adrenergic–Receptor Gene. Panel A shows an autoradiograph of an analysis of conformational polymorphisms in a single strand of DNA from a region of the 3-adrenergic–receptor gene in 7 of 10 diabetic Pima Indians. The arrow shows a variant pattern in lanes 2 through 6. Panel B shows autoradiographs obtained by direct sequence analysis of a region of the gene, with the normal sequence on the left. The sequencing of one of the PCR products that revealed a variant pattern in Panel A showed both a thymidine (T) and a cytosine (C) at nucleotide position 190. The patient with this pattern was therefore heterozygous for the nucleotide substitution that alters the predicted sequence of amino acids at codon 64, causing a replacement of tryptophan by arginine (TGGCGG, or Trp64Arg).

 

View larger version (4K): [in this window] [in a new window]   Figure 2. Diagram of the 3-Adrenergic Receptor. Each amino acid is shown as a circle. The Trp64Arg mutation appears at the beginning of the first intracellular loop.

 

View larger version (6K): [in this window] [in a new window]   Figure 3. Use of Restriction-Enzyme Digestion to Confirm the Presence of the Trp64Arg Mutation. Panel A shows a restriction map of the 367-bp PCR product used for digestion with BstNI. Digestion of the normal sequence yields fragments of 15, 34, 61, 66, 94, and 97 bp in length, whereas the Trp64Arg mutation eliminates one of the BstNI sites (dashed line), yielding a novel 158-bp product. Panel B shows an ethidium bromide–stained gel after the digestion of two DNA samples with BstNI. One subject was heterozygous for the Trp64Arg mutation of the 3-adrenergic–receptor gene (Trp/Arg), and the other was homozygous for the normal receptor (Trp/Trp). As predicted, the mutation eradicated one of the five BstNI sites in the normal sequence, causing a 158-bp product that is not normally present to appear.

 
Allelic Frequencies of the Trp64Arg Mutation in Pima Indians and Other Subjects

Genomic DNA from 642 Pima Indians (390 subjects with NIDDM and 252 without NIDDM) was subjected to genotyping for the Trp64Arg missense mutation in the ₃-adrenergic receptor by hybridization with allele-specific oligonucleotides (Figure 4). The frequency of the Trp64Arg allele was 0.31. Nine percent of the subjects were homozygous for the mutation, 45 percent were heterozygous, and 46 percent lacked the mutation. When the genotypes were analyzed according to the subjects' age and sex, there was a statistically significant underrepresentation of Trp64Arg homozygotes among men 45 or older (P = 0.02) (Table 1).

View larger version (26K): [in this window] [in a new window]   Figure 4. Detection of Mutated and Normal 3-Adrenergic Receptors by Hybridization with Allele-Specific Oligonucleotides. The 367-bp PCR products encompassing the Trp64Arg mutation in five Pima Indians were subjected to slot blot analysis in duplicate with oligonucleotide probes that specifically recognize either the normal 3-adrenergic receptor (the Trp64 probe) or the mutation (the Arg64 probe), and autoradiography was performed. Normal homozygotes (Trp/Trp), heterozygotes (Trp/Arg), and Trp64Arg homozygotes (Arg/Arg) could be detected rapidly with this assay.

 

View this table: [in this window] [in a new window]   Table 1. Frequency of Homozygosity for the Trp64Arg Mutation of the b3-Adrenergic–Receptor Gene among the Pima Indians Studied, According to Age.

 
The frequency of the Trp64Arg allele among the 62 Mexican Americans (with 124 alleles) was 0.13. Among the 49 blacks (with 98 alleles) it was 0.12, and among the 48 whites (with 96 alleles) it was 0.08.

The Trp64Arg Genotype, NIDDM, and Obesity

Diabetes was not significantly associated with the Trp64Arg genotype in the 642 Pima Indians; the prevalence of NIDDM was 72 percent, 60 percent, and 60 percent, respectively, among Trp64Arg homozygotes, Trp64Arg heterozygotes, and normal homozygotes (P = 0.19). From these data we concluded that the prevalence of NIDDM was slightly but not significantly higher among Trp64Arg homozygotes than among the Pima subjects with the other two genotypes (prevalence-rate ratio, 1.2; 95 percent confidence interval, 1.0 to 1.5). The mean age of the Trp64Arg homozygotes at the onset of NIDDM was significantly lower than that of the heterozygotes and the normal homozygotes (P = 0.02) (Table 2). In view of this finding, we also examined the prevalence of diabetes that was diagnosed before the age of 25 years. Overall, this prevalence did not differ significantly between the three groups (P = 0.11), although our data showed that the prevalence of diabetes diagnosed before the age of 25 years was higher among Trp64Arg homozygotes than among subjects with either of the other two genotypes (prevalence-rate ratio, 2.7; 95 percent confidence interval, 1.1 to 6.8).

View this table: [in this window] [in a new window]   Table 2. Characteristics of 642 Pima Indians According to Genotype of the b3-Adrenergic Receptor.

 
There was a trend toward a higher mean (±SD) body-mass index (the weight in kilograms divided by the square of the height in meters) among the subjects homozygous for the Trp64Arg mutation (35.2±8.0) than among subjects heterozygous for the mutation (34.1±7.9) or the normal homozygotes (33.9±7.5) (Table 2). Although this trend persisted after adjustment for age and sex, the differences were not statistically significant; nor were there significant differences in the ratio of the waist to the hip circumference.

The Trp64Arg Mutation and the Resting Metabolic Rate

When we studied the separate group of 210 Pima Indians, we found a trend toward a lower resting metabolic rate in subjects with the Trp64Arg mutation of the ₃-adrenergic receptor (Table 2). After we adjusted for known covariates of the resting metabolic rate (fat-free mass, fat mass, and sex), the 22 subjects homozygous for the mutation expended an average of 82 kcal per day less than the 82 normal homozygotes; in the 106 heterozygotes, the average resting metabolic rate (36 kcal per day less than that of the normal homozygotes) was intermediate between the values for the two other groups (P = 0.14 by analysis of covariance). There were no significant associations of genotype with plasma concentrations of glucose or insulin during an oral glucose-tolerance test or with sensitivity to insulin as measured by the hyperinsulinemic–euglycemic clamp technique in this group.

Discussion

We have identified a mutation in the ₃-adrenergic–receptor gene that, although not in itself associated with NIDDM, was associated with the onset of NIDDM at an earlier age among Pima Indians homozygous for the mutation. This finding suggests that the mutation is not a major determinant of NIDDM in these subjects, but rather acts to accelerate the course of the disease. The underrepresentation in the study sample of men 45 or older who were homozygous for the mutation may indicate early mortality, perhaps due to the long-term complications of diabetes that would be expected if the disease had an earlier onset.

Very small decrements in the resting metabolic rate can lead to excess accumulation of energy, weight gain, and obesity. In prospective studies of adult Pima Indians, a small daily difference in the metabolic rate (70 kcal) was a risk factor for weight gain and obesity.¹² Indeed, subjects with the Trp64Arg mutation in the gene for the ₃-adrenergic receptor tended to have lower resting metabolic rates but were no more obese than normal subjects. Prospective measures of weight gain in younger subjects and association studies in subjects less genetically predisposed to obesity will be needed to define further the influence of this mutation on low energy expenditure and the development of obesity and NIDDM. Indeed, data from Widén and Clément and their colleagues,^32,33 in addition to our own studies of Mexican Americans (unpublished data), implicate this mutation, even in its heterozygous form, as a contributor to central obesity and weight gain, as well as to insulin resistance and NIDDM with an accelerated onset. These studies provide additional evidence that this missense mutation contributes to the genetic basis of the common forms of obesity, insulin resistance, and NIDDM.

The Trp64Arg mutation appears at the beginning of the first intracellular loop of the ₃-adrenergic receptor (Figure 2). On the basis of studies of the related ₂-adrenergic receptor³⁴ and rhodopsin,³⁵ the first intracellular loop is thought to be important for the proper movement of the receptor to the cell surface and possibly also for its coupling to G proteins. Defective expression at the cell surface or impaired signaling may lead to decreased lipolysis and thermogenesis in visceral fat tissue that may contribute to central obesity, insulin resistance, and NIDDM.

Supported by a grant (NIA 5T32AG00120) from the National Institutes of Health and by grants from the Mallinckrodt Foundation (to Dr. Shuldiner), the American Federation of Aging Research (to Dr. Shuldiner), the Chesapeake Education and Research Trust (to Drs. Walston, Silver, Austin, and Shuldiner), the Robert Wood Johnson Foundation (to Dr. Austin), and the Hartford Foundation (to Drs. Walston and Austin). Dr. Walston was supported by a Pfizer–American Geriatrics Society postdoctoral fellowship.

We are indebted to Drs. John Burton and Philip Zieve for their support; to Drs. Reubin Andres, Terri Beaty, and Chahrzad Rafizadeh-Montrose for their advice and helpful comments; and to Mr. Keith Tanner and Ms. Amy Patterson for their assistance.

^* See NAPS document no. 05233 for one page of supplementary material. To order, contact NAPS c/o Microfiche Publications, 248 Hempstead Tpk., West Hempstead, NY 11552.

Source Information

From the Divisions of Geriatric Medicine and Gerontology (J.W., F.S.C., S.A., J.R., A.R.S.) and Endocrinology and Metabolism (K.S.), Johns Hopkins University School of Medicine, Baltimore; the Clinical Diabetes and Nutrition Section (C.B.) and the Diabetes and Arthritis Epidemiology Section (W.C.K.), National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, Ariz.; the Laboratory of Clinical Physiology, National Institute on Aging, Baltimore (F.S.C., J.D.S.); the Arthritis and Rheumatism Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, Md. (N.R.); the Laboratoire d'Immunopharmacologie Moléculaire, Institut Cochin de Génétique Moléculaire, Paris (B.M., A.D.S.); and the Department of Medicine, Division of Clinical Epidemiology, University of Texas Health Science Center, San Antonio (M.P.S.).

Address reprint requests to Dr. Shuldiner at the Johns Hopkins University School of Medicine, 5501 Bayview Cir., Rm. 5A42, Baltimore, MD 21224.

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