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Siddiqui J, Kinney CE, Han JC. The Genetics of Obesity. Pediatr Clin North Am 2024; 71:897-917. [PMID: 39343500 DOI: 10.1016/j.pcl.2024.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
Abstract
Understanding the genetic causes of obesity permits anticipatory guidance and targeted treatments. Children with hyperphagia and severe early-onset obesity should receive genetic testing for rare monogenic and syndromic disorders caused by pathogenic variants involving a single gene or single chromosomal region. Gene panels covering the leptin pathway, the key regulator of energy balance, are becoming more widely available and at lower cost. Polygenic obesity is much more common and involves multiple genes throughout the genome, although the overlap in genes for rare and common disorders suggests a spectrum of severity and the potential of shared precision medicine approaches for treatment.
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Affiliation(s)
- Juwairriyyah Siddiqui
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics, Mount Sinai Hospital, Diabetes, Obesity, and Metabolism Institute, Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029, USA
| | - Clint E Kinney
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics, Mount Sinai Hospital, Diabetes, Obesity, and Metabolism Institute, Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029, USA
| | - Joan C Han
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics, Mount Sinai Hospital, Diabetes, Obesity, and Metabolism Institute, Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029, USA.
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2
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Schubert T, Schaaf CP. MAGEL2 (patho-)physiology and Schaaf-Yang syndrome. Dev Med Child Neurol 2024. [PMID: 38950199 DOI: 10.1111/dmcn.16018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2024] [Revised: 05/19/2024] [Accepted: 06/11/2024] [Indexed: 07/03/2024]
Abstract
Schaaf-Yang syndrome (SYS) is a complex neurodevelopmental disorder characterized by autism spectrum disorder, joint contractures, and profound hypothalamic dysfunction. SYS is caused by variants in MAGEL2, a gene within the Prader-Willi syndrome (PWS) locus on chromosome 15. In this review, we consolidate decades of research on MAGEL2 to elucidate its physiological functions. Moreover, we synthesize current knowledge on SYS, suggesting that while MAGEL2 loss-of-function seems to underlie several SYS and PWS phenotypes, additional pathomechanisms probably contribute to the distinct and severe phenotype observed in SYS. In addition, we highlight recent therapeutic advances and identify promising avenues for future investigation.
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Affiliation(s)
- Tim Schubert
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
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3
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Wu W, Chen Z, Han J, Qian L, Wang W, Lei J, Wang H. Endocrine, genetic, and microbiome nexus of obesity and potential role of postbiotics: a narrative review. Eat Weight Disord 2023; 28:84. [PMID: 37861729 PMCID: PMC10589153 DOI: 10.1007/s40519-023-01593-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/19/2023] [Indexed: 10/21/2023] Open
Abstract
Obesity is a public health crisis, presenting a huge burden on health care and the economic system in both developed and developing countries. According to the WHO's latest report on obesity, 39% of adults of age 18 and above are obese, with an increase of 18% compared to the last few decades. Metabolic energy imbalance due to contemporary lifestyle, changes in gut microbiota, hormonal imbalance, inherent genetics, and epigenetics is a major contributory factor to this crisis. Multiple studies have shown that probiotics and their metabolites (postbiotics) supplementation have an effect on obesity-related effects in vitro, in vivo, and in human clinical investigations. Postbiotics such as the SCFAs suppress obesity by regulating metabolic hormones such as GLP-1, and PPY thus reducing feed intake and suppressing appetite. Furthermore, muramyl di-peptides, bacteriocins, and LPS have been tested against obesity and yielded promising results in both human and mice studies. These insights provide an overview of targetable pharmacological sites and explore new opportunities for the safer use of postbiotics against obesity in the future.
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Affiliation(s)
- Weiming Wu
- Department of Endocrinology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu, 215500, Jiangsu, People's Republic of China
| | - Zhengfang Chen
- Department of Endocrinology, Changshu First People's Hospital, Changshu, 215501, Jiangsu, People's Republic of China.
| | - Jiani Han
- Department of Endocrinology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu, 215500, Jiangsu, People's Republic of China
| | - Lingling Qian
- Department of Endocrinology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu, 215500, Jiangsu, People's Republic of China
| | - Wanqiu Wang
- Department of Endocrinology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu, 215500, Jiangsu, People's Republic of China
| | - Jiacai Lei
- Department of Gastroenterology, Hangzhou Ninth People's Hospital, Hangzhou, 310005, Zhejiang, People's Republic of China
| | - Huaguan Wang
- Department of Gastroenterology, Hangzhou Ninth People's Hospital, Hangzhou, 310005, Zhejiang, People's Republic of China.
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Naeini Z, Abaj F, Rafiee M, Koohdani F. Interactions of BDNF Val66met and dietary indices in relation to metabolic markers among patient with type 2 diabetes mellitus: a cross-sectional study. JOURNAL OF HEALTH, POPULATION, AND NUTRITION 2023; 42:34. [PMID: 37072879 PMCID: PMC10111776 DOI: 10.1186/s41043-023-00375-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 04/07/2023] [Indexed: 04/20/2023]
Abstract
BACKGROUND Gene-diet interaction is related to the progression of diabetes and cardiovascular diseases biomarkers. We aimed to evaluate the interaction between diet quality indices and BDNF Val66Mat (rs6265) on cardiometabolic markers among diabetic patients. METHODS This cross-sectional study was conducted on 634 patients with type 2 diabetes mellitus, which were randomly recruited from diabetic centers in Tehran. Dietary intakes were estimated by a previously validated semi-quantitative food frequency questionnaire comprising 147 items. All participants were categorized into three categories, based on healthy eating index (HEI), diet quality index (DQI), and phytochemical index (PI) scores. Polymerase chain reaction was used for genotyping the BDNF Val66Met. Interactions were tested using analysis of covariance in adjusted and crude models. RESULTS Our result showed that higher DQI, HEI, and PI scores significantly decrease body mass index and waist circumference among individuals with Met/Met, Val/Met, and Val/Val genotypes (P interactions < 0.05). Moreover, the highest quartile of the DQI and PI, compared to the lowest, showed lower TG level among Met allele carriers compared to Val/Val homozygotes (P interaction = 0.004 and 0.01, respectively) and a faster reduction in IL-18 and TC level was seen among Met/Met, Val/Met who had higher HEI intake than those with Val/Val genotype. CONCLUSIONS BDNF Val66Met polymorphism may interact with HEI, DQI, and PI. We have revealed that Met allele acts as a protective allele for diabetic patients and may have a beneficial influence on cardio-metabolic factors through regulating dietary intake.
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Affiliation(s)
- Zeinab Naeini
- Department of Cellular and Molecular Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Faezeh Abaj
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran.
| | - Masoumeh Rafiee
- Department of Clinical Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences (IUMS), Isfahan, Iran.
| | - Fariba Koohdani
- Department of Cellular and Molecular Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran.
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Ferraguti G, Terracina S, Micangeli G, Lucarelli M, Tarani L, Ceccanti M, Spaziani M, D'Orazi V, Petrella C, Fiore M. NGF and BDNF in pediatrics syndromes. Neurosci Biobehav Rev 2023; 145:105015. [PMID: 36563920 DOI: 10.1016/j.neubiorev.2022.105015] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 11/02/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022]
Abstract
Neurotrophins (NTs) as nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) play multiple roles in different settings including neuronal development, function and survival in both the peripheral and the central nervous systems from early stages. This report aims to provide a summary and subsequent review of evidences on the role of NTs in rare and non-common pediatric human diseases associated with changes in neurodevelopment. A variety of diseases has been analyzed and many have been linked to NTs neurobiological effects, including chronic granulomatous disease, hereditary sensory and autonomic neuropathy, Duchenne muscular dystrophy, Bardet-Biedl syndrome, Angelman syndrome, fragile X syndrome, trisomy 16, Williams-Beuren syndrome, Prader-Willi syndrome, WAGR syndrome, fetal alcohol spectrum disorders, Down syndrome and Klinefelter Syndrome. NTs alterations have been associated with numerous pathologic manifestations including cognitive defects, behavioral abnormalities, epilepsy, obesity, tumorigenesis as well as muscle-skeletal, immunity, bowel, pain sensibility and cilia diseases. In this report, we discuss that further studies are needed to clear a possible therapeutic role of NTs in these still often uncurable diseases.
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Affiliation(s)
- Giampiero Ferraguti
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Sergio Terracina
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Ginevra Micangeli
- Department of Maternal Infantile and Urological Sciences, Sapienza University of Rome, Italy
| | - Marco Lucarelli
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Luigi Tarani
- Department of Maternal Infantile and Urological Sciences, Sapienza University of Rome, Italy
| | - Mauro Ceccanti
- SITAC, Società Italiana per il Trattamento dell'Alcolismo e le sue Complicanze, Rome, Italy
| | - Matteo Spaziani
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Valerio D'Orazi
- Department of Surgical Sciences, Sapienza University of Rome, Rome, Italy
| | - Carla Petrella
- Institute of Biochemistry and Cell Biology, IBBC-CNR, Rome, Italy.
| | - Marco Fiore
- Institute of Biochemistry and Cell Biology, IBBC-CNR, Rome, Italy.
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Mateus Pellenz F, Crispim D, Silveira Assmann T. Systems biology approach identifies key genes and related pathways in childhood obesity. Gene X 2022; 830:146512. [PMID: 35447237 DOI: 10.1016/j.gene.2022.146512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 03/18/2022] [Accepted: 04/14/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Childhood obesity is triggered by a complex interplay of environmental, genetic, and epigenetic factors; however, the molecular mechanisms behind this disease are not completely elucidated. Thus, the aim of this study was to investigate molecular mechanisms involved in childhood obesity by implementing a systems biology approach. METHODS Experimentally validated and computationally predicted genes related to childhood obesity were downloaded from DisGeNET database. A protein-protein interaction (PPI) network was constructed using the STRING database and analyzed at Cytoscape web-tool. Hub-bottleneck genes and functional clusters were identified through CytoHubba and MCODE plugins, respectively. Functional enrichment analyses were performed based on Gene Ontology terms and KEGG Pathways. RESULTS The DisGeNET search retrieved 191 childhood obesity-related genes. The resulting PPI network contained 12 hub-bottleneck genes (INS, LEP, STAT3, POMC, ALB, TNF, BDNF, CAT, GCG, PPARG, VEGFA, and ADIPOQ) and 4 functional clusters, with cluster 1 showing the highest interaction score. Genes at this cluster were enriched at inflammation, carbohydrate, and lipid metabolism pathways. With exception of POMC, all hub-bottleneck genes were found in cluster 1, which contains highly connected genes that possibly play key roles in obesity-related pathways. CONCLUSIONS Our systems biology approach revealed a set of highly interconnected genes associated with childhood obesity, providing comprehensive information regarding genetic and molecular factors involved in the pathogenesis of this disease.
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Affiliation(s)
- Felipe Mateus Pellenz
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil; Postgraduation Program in Medical Sciences: Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Daisy Crispim
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil; Postgraduation Program in Medical Sciences: Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Taís Silveira Assmann
- Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil; Postgraduation Program in Medical Sciences: Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
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de Souza VS, da Cunha GCR, Versiani BR, de Oliveira CP, Rosa MTAS, de Oliveira SF, Moretti PN, Mazzeu JF, Pic-Taylor A. Characterization of Associated Nonclassical Phenotypes in Patients with Deletion in the WAGR Region Identified by Chromosomal Microarray: New Insights and Literature Review. Mol Syndromol 2022; 13:290-304. [PMID: 36158055 PMCID: PMC9421677 DOI: 10.1159/000518872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 08/03/2021] [Indexed: 01/03/2023] Open
Abstract
WAGR syndrome (Wilms' tumor, aniridia, genitourinary changes, and intellectual disability) is a contiguous gene deletion syndrome characterized by the joint deletion of PAX6 and WT1 genes, located in the short arm of chromosome 11. However, most deletions include other genes, leading to multiple associated phenotypes. Therefore, understanding how genes deleted together can contribute to other clinical phenotypes is still considered a challenge. In order to establish genotype-phenotype correlation in patients with interstitial deletions of the short arm of chromosome 11, we selected 17 patients with deletions identified by chromosomal microarray analysis: 4 new subjects and 13 subjects previously described in the literature with detailed clinical data. Through the analysis of deleted regions and the phenotypic changes, it was possible to suggest the contribution of specific genes to several nonclassical phenotypes, contributing to the accuracy of clinical characterization of the syndrome and emphasizing the broad phenotypic spectrum found in the patients. This study reports the first patient with a PAX6 partial deletion who does not present any eye anomaly thus opening a new set of questions about the functional activity of PAX6.
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Affiliation(s)
- Vanessa Sodré de Souza
- Programa de Pós-graduação em Biologia Animal, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasília, Brazil
| | - Gabriela Corassa Rodrigues da Cunha
- Programa de Pós-graduação em Biologia Animal, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasília, Brazil
| | - Beatriz R. Versiani
- Hospital de Apoio de Brasília, Secretária de Estado de Saúde do Distrito Federal, Brasília, Brazil,Hospital Universitário, Universidade de Brasília, Brasília, Brazil
| | - Claudiner Pereira de Oliveira
- Hospital de Apoio de Brasília, Secretária de Estado de Saúde do Distrito Federal, Brasília, Brazil,Hospital Universitário, Universidade de Brasília, Brasília, Brazil
| | - Maria Teresa Alves Silva Rosa
- Hospital Universitário, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências Médicas, Universidade de Brasília, Brasília, Brazil
| | - Silviene F. de Oliveira
- Programa de Pós-graduação em Biologia Animal, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasília, Brazil,Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, Brazil
| | - Patricia N. Moretti
- Programa de Pós-graduação em Ciências Médicas, Universidade de Brasília, Brasília, Brazil
| | - Juliana F. Mazzeu
- Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências Médicas, Universidade de Brasília, Brasília, Brazil,Faculdade de Medicina, Universidade de Brasília, Brasília, Brazil,*Juliana F. Mazzeu,
| | - Aline Pic-Taylor
- Programa de Pós-graduação em Biologia Animal, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasília, Brazil,Programa de Pós-graduação em Ciências Médicas, Universidade de Brasília, Brasília, Brazil,Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, Brazil,**Aline Pic-Taylor,
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Di Rosa MC, Zimbone S, Saab MW, Tomasello MF. The Pleiotropic Potential of BDNF beyond Neurons: Implication for a Healthy Mind in a Healthy Body. Life (Basel) 2021; 11:life11111256. [PMID: 34833132 PMCID: PMC8625665 DOI: 10.3390/life11111256] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/14/2021] [Accepted: 11/15/2021] [Indexed: 12/14/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) represents one of the most widely studied neurotrophins because of the many mechanisms in which it is involved. Among these, a growing body of evidence indicates BDNF as a pleiotropic signaling molecule and unveils non-negligible implications in the regulation of energy balance. BDNF and its receptor are extensively expressed in the hypothalamus, regions where peripheral signals, associated with feeding control and metabolism activation, and are integrated to elaborate anorexigenic and orexigenic effects. Thus, BDNF coordinates adaptive responses to fluctuations in energy intake and expenditure, connecting the central nervous system with peripheral tissues, including muscle, liver, and the adipose tissue in a complex operational network. This review discusses the latest literature dealing with the involvement of BDNF in the maintenance of energy balance. We have focused on the physiological and molecular mechanisms by which BDNF: (I) controls the mitochondrial function and dynamics; (II) influences thermogenesis and tissue differentiation; (III) mediates the effects of exercise on cognitive functions; and (IV) modulates insulin sensitivity and glucose transport at the cellular level. Deepening the understanding of the mechanisms exploited to maintain energy homeostasis will lay the groundwork for the development of novel therapeutical approaches to help people to maintain a healthy mind in a healthy body.
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Affiliation(s)
- Maria Carmela Di Rosa
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 64, 95123 Catania, Italy; (M.C.D.R.); (M.W.S.)
- Institute of Crystallography, CNR, Via P. Gaifami 18, 95126 Catania, Italy;
| | - Stefania Zimbone
- Institute of Crystallography, CNR, Via P. Gaifami 18, 95126 Catania, Italy;
| | - Miriam Wissam Saab
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 64, 95123 Catania, Italy; (M.C.D.R.); (M.W.S.)
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Podyma B, Parekh K, Güler AD, Deppmann CD. Metabolic homeostasis via BDNF and its receptors. Trends Endocrinol Metab 2021; 32:488-499. [PMID: 33958275 PMCID: PMC8192464 DOI: 10.1016/j.tem.2021.04.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/10/2021] [Accepted: 04/12/2021] [Indexed: 12/12/2022]
Abstract
Metabolic disorders result from dysregulation of central nervous system and peripheral metabolic energy homeostatic pathways. To maintain normal energy balance, neural circuits must integrate feedforward and feedback signals from the internal metabolic environment to orchestrate proper food intake and energy expenditure. These signals include conserved meal and adipocyte cues such as glucose and leptin, respectively, in addition to more novel players including brain-derived neurotrophic factor (BDNF). In particular, BDNF's two receptors, tropomyosin related kinase B (TrkB) and p75 neurotrophin receptor (p75NTR), are increasingly appreciated to be involved in whole body energy homeostasis. At times, these two receptors even seem to functionally oppose one another's actions, providing the framework for a potential neurotrophin mediated energy regulatory axis, which we explore further here.
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Affiliation(s)
- Brandon Podyma
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, VA 22908-0738, USA.
| | - Kavya Parekh
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Ali D Güler
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
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Lazea C, Sur L, Florea M. ROHHAD (Rapid-onset Obesity with Hypoventilation, Hypothalamic Dysfunction, Autonomic Dysregulation) Syndrome-What Every Pediatrician Should Know About the Etiopathogenesis, Diagnosis and Treatment: A Review. Int J Gen Med 2021; 14:319-326. [PMID: 33542648 PMCID: PMC7853626 DOI: 10.2147/ijgm.s293377] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 12/31/2020] [Indexed: 12/14/2022] Open
Abstract
Rapid-onset obesity with hypoventilation, hypothalamic dysfunction, autonomic dysregulation (ROHHAD) syndrome is a rare disease with unknown and debated etiology, characterized by precipitous obesity in young children, hypoventilation and autonomic dysregulation with various endocrine abnormalities. Neuroendocrine tumors can be associated in more than half of the cases. This rare condition has a severe outcome because of high morbidity and mortality. We provide a comprehensive description of the etiopathogenetic theories of the disease, clinical presentation, diagnostic workup and treatment possibilities.
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Affiliation(s)
- Cecilia Lazea
- Department Pediatrics I, Emergency Pediatric Hospital, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania
| | - Lucia Sur
- Department Pediatrics I, Emergency Pediatric Hospital, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania
| | - Mira Florea
- Community Medicine Department, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania
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da Fonseca ACP, Abreu GDM, Palhinha L, Zembrzuski VM, Campos Junior M, Carneiro JRI, Nogueira Neto JF, Magno FCCM, Rosado EL, Maya-Monteiro CM, de Cabello GMK, Cabello PH, Bozza PT. A Rare Potential Pathogenic Variant in the BDNF Gene is Found in a Brazilian Patient with Severe Childhood-Onset Obesity. Diabetes Metab Syndr Obes 2021; 14:11-22. [PMID: 33442278 PMCID: PMC7797284 DOI: 10.2147/dmso.s267202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 08/29/2020] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Brain-derived neurotrophic factor (BDNF) is a pro-survival factor in the brain that also regulates energy balance. BDNF loss-of-function point mutations are responsible for haploinsufficiency, causing severe early-onset obesity. Up to date, only a few studies have sequenced this gene to search for rare mutations related to obesity. In this study, we aimed to investigate the prevalence of BDNF variants in a cohort of adults with severe obesity from Brazil. MATERIAL AND METHODS This study comprised 201 adults with severe obesity (BMI ≥ 35.0 kg/m2) with onset during childhood- or adolescence/youth. As controls, 73 subjects with normal weight (18.5 ≤ BMI ≤ 24.9 kg/m2) were selected. The exclusion criteria were pregnancy, lactation, the use of medication to lose or gain weight, and the presence of symptoms suggestive of syndromic obesity (only for the case group). The coding region of the BDNF gene was screened by Sanger sequencing. Demographic, anthropometric, and blood pressure parameters were obtained from the participants as well as serum hormone and cytokines concentrations and biochemical values. RESULTS As a result, three missense variants [p.(Thr2Ile), p.(Val66Met), and p.(Arg209Gln)] and four synonymous variants (p.Leu107=, p.Thr149=, p.Ala150=, and p.Ser213=) were identified. The p.(Arg209Gln) was predicted as pathogenic by all in silico algorithms used and was not observed in the control group. The individuals carrying the p.(Val66Met) mutated allele had higher waist circumference, HDL-cholesterol and MCP1 levels, and reduced risk of developing metabolic syndrome. CONCLUSION We observed that the common BDNF p.(Val66Met) variant has influenced waist circumference, HDL-cholesterol, and MCP1 levels. This polymorphism has also a protective effect on metabolic syndrome susceptibility. Additionally, we described for the first time a rare potentially pathogenic BDNF variant in a Brazilian patient with severe obesity and childhood-onset.
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Affiliation(s)
- Ana Carolina Proença da Fonseca
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Correspondence: Ana Carolina Proença da Fonseca Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, 4365 Brasil Avenue, Leônidas Deane Building – Office 611/615, Rio de Janeiro, RJ21040-360, BrazilTel +552138658192Fax +552138658239 Email
| | | | - Lohanna Palhinha
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | | | - Mario Campos Junior
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - João Regis Ivar Carneiro
- Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Eliane Lopes Rosado
- Institute of Nutrition Josué de Castro, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Pedro Hernán Cabello
- Human Genetics Laboratory, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
- Human Genetics Laboratory, Grande Rio University, Rio de Janeiro, Brazil
| | - Patricia Torres Bozza
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
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Marcos-Pasero H, Aguilar-Aguilar E, Ikonomopoulou MP, Loria-Kohen V. BDNF Gene as a Precision Skill of Obesity Management. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1331:233-248. [PMID: 34453302 DOI: 10.1007/978-3-030-74046-7_15] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The scarcity of the results obtained for the treatment of obesity leads us to consider new strategies, contemplating all the factors involved in the development of the disease. One of the key molecules for controlling body weight and energy homeostasis is the brain-derived neurotrophic factor (BDNF). This work summarizes the mechanisms in which BDNF gene regulates this multifactorial disease. In addition, we discuss the role of other BDNF polymorphisms as genetic determinants of obesity. In this context, a total of 14 SNPs near or inside BDNF/BDNF-AS related to BMI were identified in various GWASs. Finally, we assess gene-diet interaction as a novel tool to prevent obesity and formulate solid and personalized nutritional management. Our research group has performed the first study on the association of BDNF-AS rs925946 polymorphism and calcium intake as potential modulators of the nutritional status. Although these results should be confirmed in future studies, they open the path for new prevention opportunities.
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Affiliation(s)
- Helena Marcos-Pasero
- Nutrition and Clinical Trials Unit, GENYAL Platform, IMDEA-Food Institute, CEI UAM + CSIC, Madrid, Spain
| | - Elena Aguilar-Aguilar
- Nutrition and Clinical Trials Unit, GENYAL Platform, IMDEA-Food Institute, CEI UAM + CSIC, Madrid, Spain
| | - Maria P Ikonomopoulou
- Translational Venomics Group, IMDEA-Food, CEI UAM+CSIC, Madrid, Spain.,Institute for Molecular Bioscience, The University of Queensland, St Lucia, Australia
| | - Viviana Loria-Kohen
- Nutrition and Clinical Trials Unit, GENYAL Platform, IMDEA-Food Institute, CEI UAM + CSIC, Madrid, Spain. .,Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, Madrid, Spain.
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Javed S, Selliah T, Lee YJ, Huang WH. Dosage-sensitive genes in autism spectrum disorders: From neurobiology to therapy. Neurosci Biobehav Rev 2020; 118:538-567. [PMID: 32858083 DOI: 10.1016/j.neubiorev.2020.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/26/2020] [Accepted: 08/17/2020] [Indexed: 12/24/2022]
Abstract
Autism spectrum disorders (ASDs) are a group of heterogenous neurodevelopmental disorders affecting 1 in 59 children. Syndromic ASDs are commonly associated with chromosomal rearrangements or dosage imbalance involving a single gene. Many of these genes are dosage-sensitive and regulate transcription, protein homeostasis, and synaptic function in the brain. Despite vastly different molecular perturbations, syndromic ASDs share core symptoms including social dysfunction and repetitive behavior. However, each ASD subtype has a unique pathogenic mechanism and combination of comorbidities that require individual attention. We have learned a great deal about how these dosage-sensitive genes control brain development and behaviors from genetically-engineered mice. Here we describe the clinical features of eight monogenic neurodevelopmental disorders caused by dosage imbalance of four genes, as well as recent advances in using genetic mouse models to understand their pathogenic mechanisms and develop intervention strategies. We propose that applying newly developed quantitative molecular and neuroscience technologies will advance our understanding of the unique neurobiology of each disorder and enable the development of personalized therapy.
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Affiliation(s)
- Sehrish Javed
- Centre for Research in Neuroscience, Department of Neurology and Neurosurgery, The Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - Tharushan Selliah
- Centre for Research in Neuroscience, Department of Neurology and Neurosurgery, The Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - Yu-Ju Lee
- Centre for Research in Neuroscience, Department of Neurology and Neurosurgery, The Research Institute of the McGill University Health Centre, Montréal, Québec, Canada
| | - Wei-Hsiang Huang
- Centre for Research in Neuroscience, Department of Neurology and Neurosurgery, The Research Institute of the McGill University Health Centre, Montréal, Québec, Canada.
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Gowda S, Seibert T, Uli N, Farrell R. Pediatric Obesity: Endocrinologic and Genetic Etiologies and Management. CURRENT CARDIOVASCULAR RISK REPORTS 2019. [DOI: 10.1007/s12170-019-0632-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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In vivo epigenetic editing of Sema6a promoter reverses transcallosal dysconnectivity caused by C11orf46/Arl14ep risk gene. Nat Commun 2019; 10:4112. [PMID: 31511512 PMCID: PMC6739341 DOI: 10.1038/s41467-019-12013-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 08/12/2019] [Indexed: 12/15/2022] Open
Abstract
Many neuropsychiatric risk genes contribute to epigenetic regulation but little is known about specific chromatin-associated mechanisms governing the formation of neuronal connectivity. Here we show that transcallosal connectivity is critically dependent on C11orf46, a nuclear protein encoded in the chromosome 11p13 WAGR risk locus. C11orf46 haploinsufficiency was associated with hypoplasia of the corpus callosum. C11orf46 knockdown disrupted transcallosal projections and was rescued by wild type C11orf46 but not the C11orf46R236H mutant associated with intellectual disability. Multiple genes encoding key regulators of axonal development, including Sema6a, were hyperexpressed in C11orf46-knockdown neurons. RNA-guided epigenetic editing of Sema6a gene promoters via a dCas9-SunTag system with C11orf46 binding normalized SEMA6A expression and rescued transcallosal dysconnectivity via repressive chromatin remodeling by the SETDB1 repressor complex. Our study demonstrates that interhemispheric communication is sensitive to locus-specific remodeling of neuronal chromatin, revealing the therapeutic potential for shaping the brain's connectome via gene-targeted designer activators and repressor proteins.
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Tyszkiewicz-Nwafor M, Rybakowski F, Dmitrzak-Weglarz M, Skibinska M, Paszynska E, Dutkiewicz A, Słopien A. Brain-Derived Neurotrophic Factor and Oxytocin Signaling in Association With Clinical Symptoms in Adolescent Inpatients With Anorexia Nervosa-A Longitudinal Study. Front Psychiatry 2019; 10:1032. [PMID: 32184739 PMCID: PMC7058805 DOI: 10.3389/fpsyt.2019.01032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 12/31/2019] [Indexed: 01/11/2023] Open
Abstract
INTRODUCTION Brain-derived neurotrophic factor (BDNF), as well as oxytocin (OXY), are centrally secreted neuropeptides regulating a range of physiological processes, including food intake and metabolism. Moreover, numerous reports suggest their role in affective and cognitive symptoms of various psychiatric disorders. Thus, the study aimed to measure the serum level of BDNF and its receptor-tropomyosin-related kinase B (TrkB) and OXY in the malnourished anorexia nervosa patients and following partial weight-recovery. The correlations between levels of these proteins with the primary symptoms of the anorexia nervosa (AN) were also analyzed. METHODOLOGY Eighty-four adolescent AN patients were recruited into the study, but only forty-two AN patients completed it. The control group comprises of thirty age- and height-matched girls (CG). Serum BDNF, TrkB, and OXY levels were measured in AN group in two time-points-at the beginning of the hospitalization in malnourished patients (AN-T1) and again after partial weight normalization, on the day of discharge (AN-T2). The severity of eating disorders, as well as depressive and obsessive-compulsive symptoms, were assessed at the same two-time points. RESULTS Body mass index (BMI) differed significantly between the AN-T1, AN-T2, and CG. BDNF levels for the AN-T2 increased significantly in comparison to the AN-T1, but at two-time points were significantly lower than in the CG. The OXY level did not change with weight gain and in both groups AN-T1 and AN-T2 were statistically significantly higher than in the CG. Statistically significant negative correlations between BDNF and the severity of eating disorders symptoms were found. Depressive and obsessive-compulsive symptoms did not show significant correlations with levels of studied proteins for either malnourished or partially weight recovered AN patients. CONCLUSIONS BDNF serum levels were decreased in the malnourished AN patients and tended to normalize with partial weight recovery. OXY serum levels were found to be increased in the malnourished AN patients and did not normalize with partial weight recovery, confirming previous reports about its role in the etiopathogenesis of AN. BDNF can be related to aberrant eating behaviors occurring in AN. Our results do not support the role of serum levels of BDNF, TrkB, or OXY in the modulation of depressive or obsessive-compulsive symptoms.
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Affiliation(s)
- Marta Tyszkiewicz-Nwafor
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, Poznan, Poland
| | - Filip Rybakowski
- Department Psychiatry, Poznan University of Medical Sciences, Poznan, Poland
| | | | - Maria Skibinska
- Department of Psychiatric Genetics, Poznan University of Medical Sciences, Poznan, Poland
| | - Elżbieta Paszynska
- Department of Integrated Dentistry, Poznan University of Medical Sciences, Poznan, Poland
| | - Agata Dutkiewicz
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, Poznan, Poland
| | - Agnieszka Słopien
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, Poznan, Poland
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Şiraz ÜG, Ökdemir D, Direk G, Akın L, Hatipoğlu N, Kendirci M, Kurtoğlu S. ROHHAD Syndrome, a Rare Cause of Hypothalamic Obesity: Report of Two Cases. J Clin Res Pediatr Endocrinol 2018; 10:382-386. [PMID: 29553042 PMCID: PMC6280328 DOI: 10.4274/jcrpe.0027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Rapid-onset obesity with hypoventilation, hypothalamic dysfunction and autonomic dysregulation (ROHHAD) syndrome is a rare disease that is difficult to diagnosis and distinguish from genetic obesity syndromes. The underlying causes of the disease have not been fully explained. Hypothalamic dysfunction causes endocrine problems, respiratory dysfunction and autonomic alterations. Currently there are around 80 reported patients although this is likely due to underdiagnosis due to lack of recognition. We present two female patients suspected of ROHHAD due to weight gain starting in early childhood. Clinical and biochemical findings such as respiratory and circulatory dysfunction, hypothalamic hypernatremia, central hypothyrodism, hyperprolactinemia and central early puberty in these patients matched the criteria for ROHHAD syndrome. ROHHAD syndrome should be considered in the differential diagnosis of monogenic obesity.
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Affiliation(s)
- Ülkü Gül Şiraz
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey,* Address for Correspondence: Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey Phone: +90 532 505 87 09 E-mail:
| | - Deniz Ökdemir
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
| | - Gül Direk
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
| | - Leyla Akın
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
| | - Nihal Hatipoğlu
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
| | - Mustafa Kendirci
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
| | - Selim Kurtoğlu
- Erciyes University Faculty of Medicine, Department of Pediatric Endocrinology, Kayseri, Turkey
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Lee JM, Shin J, Kim S, Gee HY, Lee JS, Cha DH, Rim JH, Park SJ, Kim JH, Uçar A, Kronbichler A, Lee KH, Shin JI. Rapid-Onset Obesity with Hypoventilation, Hypothalamic, Autonomic Dysregulation, and Neuroendocrine Tumors (ROHHADNET) Syndrome: A Systematic Review. BIOMED RESEARCH INTERNATIONAL 2018; 2018:1250721. [PMID: 30584530 PMCID: PMC6280256 DOI: 10.1155/2018/1250721] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 09/24/2018] [Accepted: 10/28/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIM ROHHADNET (rapid-onset obesity with hypoventilation, hypothalamic, autonomic dysregulation, neuroendocrine tumor) syndrome is a rare disease with grave outcome. Although early recognition is essential, prompt diagnosis may be challenging due to its extreme rarity. This study aimed to systematically review its clinical manifestation and to identify genetic causes. MATERIALS AND METHODS We firstly conducted a systematic review on ROHHAD/NET. Electronic databases were searched using related terms. We secondly performed whole exome sequencing (WES) and examined copy number variation (CNV) in two patients to identify genetic causes. RESULTS In total, 46 eligible studies including 158 patients were included. There were 36 case reports available for individual patient data (IPD; 48 patients, 23 ROHHAD, and 25 ROHHADNET) and 10 case series available for aggregate patient data (APD; 110 patients, 71 ROHHAD, and 39 ROHHADNET). The median age at onset calculated from IPD was 4 years. Gender information was available in 100 patients (40 from IPD and 60 from APD) in which 65 females and 35 males were showing female preponderance. Earliest manifestation was rapid obesity, followed by hypothalamic symptoms. Most common types of neuroendocrine tumors were ganglioneuromas. Patients frequently had dysnatremia and hyperprolactinemia. Two patients were available for WES. Rare variants were identified in PIK3R3, SPTBN5, and PCF11 in one patient and SRMS, ZNF83, and KMT2B in another patient, respectively. However, there was no surviving variant shared by the two patients after filtering. CONCLUSIONS This study systematically reviewed the phenotype of ROHHAD/NET aiming to help early recognition and reducing morbidity. The link of variants identified in the present WES requires further investigation.
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Affiliation(s)
- Jiwon M. Lee
- Department of Pediatrics, Chungnam National University Hospital, Daejeon, Republic of Korea
| | - Jaewon Shin
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Sol Kim
- Yonsei University Wonju College of Medicine, Seoul, Republic of Korea
| | - Heon Yung Gee
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Joon Suk Lee
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Do Hyeon Cha
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - John Hoon Rim
- Department of Pharmacology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Se-Jin Park
- Department of Pediatrics, Geoje Children's Hospital, Ajou University School of Medicine, Geoje, Republic of Korea
| | - Ji Hong Kim
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Ahmet Uçar
- Department of Pediatric Endocrinology and Diabetes, Health Sciences University, Sisli Hamidiye Etfal Education & Research Hospital, Istanbul, Turkey
| | - Andreas Kronbichler
- Department of Internal Medicine IV (Nephrology and Hypertension), Medical University Innsbruck, Innsbruck, Austria
| | - Keum Hwa Lee
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, Republic of Korea
- Division of Pediatric Nephrology, Severance Children's Hospital, Seoul, Republic of Korea
| | - Jae Il Shin
- Department of Pediatrics, Yonsei University College of Medicine, Seoul, Republic of Korea
- Division of Pediatric Nephrology, Severance Children's Hospital, Seoul, Republic of Korea
- Institute of Kidney Disease Research, Yonsei University College of Medicine, Seoul, Republic of Korea
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Abstract
PURPOSE OF REVIEW This review aims to present current information on genes underlying severe obesity, with the main emphasis on the three genes LEP, LEPR and MC4R. RECENT FINDINGS There is a substantial amount of evidence that variants in at least ten different genes are the cause of severe monogenic obesity. The majority of these are involved in the leptin-melanocortin signalling pathway. Due to the frequency of some of the identified variants, it is clear that monogenic variants also make a significant contribution to common obesity. The artificial distinction between rare monogenic obesity and common polygenic obesity is now obsolete with the identification of MC4R variants of strong effect in the general population.
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Affiliation(s)
- Una Fairbrother
- School of Human Sciences, London Metropolitan University, North Campus, 166-220 Holloway Road, London, N7 8DB, UK
| | - Elliot Kidd
- School of Human Sciences, London Metropolitan University, North Campus, 166-220 Holloway Road, London, N7 8DB, UK
| | - Tanya Malagamuwa
- Institute of Medical and Biomedical Education, St George's University of London, Cranmer Terrace, Tooting, London, SW17 0RE, UK
| | - Andrew Walley
- Institute of Medical and Biomedical Education, St George's University of London, Cranmer Terrace, Tooting, London, SW17 0RE, UK.
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Geets E, Meuwissen MEC, Van Hul W. Clinical, molecular genetics and therapeutic aspects of syndromic obesity. Clin Genet 2018; 95:23-40. [PMID: 29700824 DOI: 10.1111/cge.13367] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/05/2018] [Accepted: 04/16/2018] [Indexed: 12/13/2022]
Abstract
Obesity has become a major health problem worldwide. To date, more than 25 different syndromic forms of obesity are known in which one (monogenic) or multiple (polygenic) genes are involved. This review gives an overview of these forms and focuses more in detail on 6 syndromes: Prader Willi Syndrome and Prader Willi like phenotype, Bardet Biedl Syndrome, Alström Syndrome, Wilms tumor, Aniridia, Genitourinary malformations and mental Retardation syndrome and 16p11.2 (micro)deletions. Years of research provided plenty of information on the molecular genetics of these disorders and the obesity phenotype leading to a more individualized treatment of the symptoms, however, many questions still remain unanswered. As these obesity syndromes have different signs and symptoms in common, it makes it difficult to accurately diagnose patients which may result in inappropriate treatment of the disease. Therefore, the big challenge for clinicians and scientists is to more clearly differentiate all syndromic forms of obesity to provide conclusive genetic explanations and eventually deliver accurate genetic counseling and treatment. In addition, further delineation of the (functions of the) underlying genes with the use of array- or next-generation sequencing-based technology will be helpful to unravel the mechanisms of energy metabolism in the general population.
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Affiliation(s)
- E Geets
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - M E C Meuwissen
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - W Van Hul
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
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Page LC, Shi M, Freemark M. Early-Onset Obesity Caused by Monogenic Disorders. CURRENT PEDIATRICS REPORTS 2017. [DOI: 10.1007/s40124-017-0132-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Cuéllar R, Montero S, Luquín S, García-Estrada J, Melnikov V, Virgen-Ortiz A, Lemus M, Pineda-Lemus M, de Álvarez-Buylla E. BDNF and AMPA receptors in the cNTS modulate the hyperglycemic reflex after local carotid body NaCN stimulation. Auton Neurosci 2017; 205:12-20. [PMID: 28254195 DOI: 10.1016/j.autneu.2017.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 11/29/2016] [Accepted: 02/01/2017] [Indexed: 11/30/2022]
Abstract
The application of sodium cyanide (NaCN) to the carotid body receptors (CBR) (CBR stimulation) induces rapid blood hyperglycemia and an increase in brain glucose retention. The commissural nucleus tractus solitarius (cNTS) is an essential relay nucleus in this hyperglycemic reflex; it receives glutamatergic afferents (that also release brain derived neurotrophic factor, BDNF) from the nodose-petrosal ganglia that relays CBR information. Previous work showed that AMPA in NTS blocks hyperglycemia and brain glucose retention after CBR stimulation. In contrast, BDNF, which attenuates glutamatergic AMPA currents in NTS, enhances these glycemic responses. Here we investigated the combined effects of BDNF and AMPA (and their antagonists) in NTS on the glycemic responses to CBR stimulation. Microinjections of BDNF plus AMPA into the cNTS before CBR stimulation in anesthetized rats, induced blood hyperglycemia and an increase in brain arteriovenous (a-v) of blood glucose concentration difference, which we infer is due to increased brain glucose retention. By contrast, the microinjection of the TrkB antagonist K252a plus AMPA abolished the glycemic responses to CBR stimulation similar to what is observed after AMPA pretreatments. In BDNF plus AMPA microinjections preceding CBR stimulation, the number of c-fos immunoreactive cNTS neurons increased. In contrast, in the rats microinjected with K252a plus AMPA in NTS, before CBR stimulation, c-fos expression in cNTS decreased. The expression of AMPA receptors GluR2/3 did not change in any of the studied groups. These results indicate that BDNF in cNTS plays a key role in the modulation of the hyperglycemic reflex initiated by CBR stimulation.
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Affiliation(s)
- R Cuéllar
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Ave. 25 de Julio 965, Colima 28045, Mexico; Departamento de Neurociencias, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Sierra Mojada 950, Guadalajara 44340, Mexico
| | - S Montero
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Ave. 25 de Julio 965, Colima 28045, Mexico; Facultad de Medicina, Universidad de Colima, Ave. Universidad 333, Colima 28040, Mexico
| | - S Luquín
- Departamento de Neurociencias, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Sierra Mojada 950, Guadalajara 44340, Mexico
| | - J García-Estrada
- Departamento de Neurociencias, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Sierra Mojada 950, Guadalajara 44340, Mexico; División de Investigación Quirúrgica, Centro de Investigación Biomédica de Occidente, IMSS, Guadalajara, Mexico
| | - V Melnikov
- Facultad de Medicina, Universidad de Colima, Ave. Universidad 333, Colima 28040, Mexico
| | - A Virgen-Ortiz
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Ave. 25 de Julio 965, Colima 28045, Mexico
| | - M Lemus
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Ave. 25 de Julio 965, Colima 28045, Mexico
| | - M Pineda-Lemus
- Facultad de Medicina, Universidad de Colima, Ave. Universidad 333, Colima 28040, Mexico
| | - E de Álvarez-Buylla
- Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Ave. 25 de Julio 965, Colima 28045, Mexico.
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Plotkin JL, Wu C. Neurotrophin biology at NGF 2016: From fundamental science to clinical applications. Int J Dev Neurosci 2016; 56:27-34. [PMID: 27888062 DOI: 10.1016/j.ijdevneu.2016.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Accepted: 11/21/2016] [Indexed: 12/21/2022] Open
Affiliation(s)
- Joshua L Plotkin
- Department of Neurobiology & Behavior, Stony Brook University School of Medicine, Stony Brook, NY 11794, USA.
| | - Chengbiao Wu
- Department of Neuroscience, University of California San Diego School of Medicine, La Jolla, CA 92093, USA.
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Dysregulation of hypothalamic modulation in olanzapine treated male rats. Prog Neuropsychopharmacol Biol Psychiatry 2016; 71:103-7. [PMID: 27353111 DOI: 10.1016/j.pnpbp.2016.06.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 06/21/2016] [Accepted: 06/23/2016] [Indexed: 01/09/2023]
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Interaction of BDNF rs6265 variants and energy and protein intake in the risk for glucose intolerance and type 2 diabetes in middle-aged adults. Nutrition 2016; 33:187-194. [PMID: 27553771 DOI: 10.1016/j.nut.2016.07.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 07/01/2016] [Accepted: 07/19/2016] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Brain-derived neurotrophic factor (BDNF) is associated with the risk for Alzheimer's disease and type 2 diabetes. The aim of this study was to examine the association of BDNF variants with type 2 diabetes and the interactions of different BDNF genotypes with dietary habits and food and nutrient intakes in middle-aged adults. METHODS The study population included 8840 adults ages 40 to 65 y from the Ansan and Asung areas in the Korean Genome Epidemiology Study, a cross-sectional study of Korean adults, conducted from 2001 to 2002. Adjusted odd ratios for the prevalence of glucose intolerance and type 2 diabetes according to BDNF genotypes were calculated after adjusting for age, sex, residence area, body mass index, physical activity, and smoking and stress status. Nutrient intake was calculated from usual food intake determined by semiquantitative food frequencies using the nutrient assessment software. RESULTS BDNF rs6265 Val/Met and Met/Met variants were negatively associated with the risk for type 2 diabetes after adjusting for covariates. Serum glucose levels after glucose loading and hemoglobin A1c, but not serum insulin levels, also were negatively associated with BDNF Val/Met and Met/Met. In subgroup analysis, sex and stress levels had an interaction with BDNF Val/Met in the risk for type 2 diabetes. Glucose-intolerant and diabetic, but not nondiabetic, patients with BDNF Met/Met had nominally, but significantly higher intakes of energy than those with BDNF Val/Val. BDNF rs6265 had consistent gene-diet interactions with energy and protein intake. With low-energy, low-protein, and high-carbohydrate intake, BDNF Val/Met lowered the risk for type 2 diabetes after adjusting for confounding factors. BDNF Val/Met did not compensate for developing type 2 diabetes with high-energy intake. Additionally, indexes of insulin resistance and insulin secretion showed the same gene-energy interaction as type 2 diabetes. CONCLUSIONS BDNF Val/Met and Met/Met variants (rs6265) decreases the risk for glucose intolerance and type 2 diabetes. BDNF variants interacted with nutrient intake, especially energy and protein intake: Middle-aged individuals with BDNF Val/Val are prone to developing type 2 diabetes even with low energy and protein intake.
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