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Hames A, Khan S, Gilliland C, Goldman L, Lo HW, Magda K, Keathley J. Carriers of autosomal recessive conditions: are they really 'unaffected?'. J Med Genet 2023; 61:1-7. [PMID: 37775265 DOI: 10.1136/jmg-2023-109563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 09/11/2023] [Indexed: 10/01/2023]
Abstract
Mendel's Law of Dominance suggests that recessive disease expression requires the inheritance of two mutated alleles as the dominant, wildtype allele suppresses disease presentation leading to the expression of physiological normal phenotypes. However, there is existing evidence that challenges this school of thought. Here, we summarise existing literature evaluating metabolic and health impacts among carriers of autosomal recessive conditions, focusing on phenylketonuria (PKU), classical homocystinuria, galactosemia and Usher syndrome as examples. Our findings suggest that carriers, often described as 'unaffected', may actually display attenuated symptoms for the recessive disease they are carrying. For instance, PKU is an inborn error of metabolism characterised by the build-up of plasma phenylalanine attributed to the deficiency of the phenylalanine hydroxylase (PAH) enzyme. While less severe, PKU carriers also exhibit this impaired enzymatic activity, leading to elevated plasma phenylalanine levels, especially after phenylalanine consumption. Related to these metabolic alterations in the PAH pathway, there is early evidence to suggest that PKU carriers may have compromised cognitive and mental health outcomes. Overall, research on the health and metabolic impacts of PKU carriers is sparse, with most studies conducted several decades ago. However, early evidence suggests that intermediate phenotypes among carriers of autosomal recessive conditions are plausible. The illustrated possible intermediate phenotypes observed among carriers necessitates future research to determine possible clinical implications among this population.
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Affiliation(s)
- Amber Hames
- Department of Family Relations and Applied Nutrition, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Sophia Khan
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Clara Gilliland
- Department of Food Science, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Lucy Goldman
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Hillary Wh Lo
- Department of Family Relations and Applied Nutrition, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Kevin Magda
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Southwestern Ontario, Canada
- Department of Biomedical Sciences, University of Guelph, Guelph, Southwestern Ontario, Canada
| | - Justine Keathley
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Southwestern Ontario, Canada
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Dhanapal ACTA, Wuni R, Ventura EF, Chiet TK, Cheah ESG, Loganathan A, Quen PL, Appukutty M, Noh MFM, Givens I, Vimaleswaran KS. Implementation of Nutrigenetics and Nutrigenomics Research and Training Activities for Developing Precision Nutrition Strategies in Malaysia. Nutrients 2022; 14:5108. [PMID: 36501140 PMCID: PMC9740135 DOI: 10.3390/nu14235108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/16/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022] Open
Abstract
Nutritional epidemiological studies show a triple burden of malnutrition with disparate prevalence across the coexisting ethnicities in Malaysia. To tackle malnutrition and related conditions in Malaysia, research in the new and evolving field of nutrigenetics and nutrigenomics is essential. As part of the Gene-Nutrient Interactions (GeNuIne) Collaboration, the Nutrigenetics and Nutrigenomics Research and Training Unit (N2RTU) aims to solve the malnutrition paradox. This review discusses and presents a conceptual framework that shows the pathway to implementing and strengthening precision nutrition strategies in Malaysia. The framework is divided into: (1) Research and (2) Training and Resource Development. The first arm collects data from genetics, genomics, transcriptomics, metabolomics, gut microbiome, and phenotypic and lifestyle factors to conduct nutrigenetic, nutrigenomic, and nutri-epigenetic studies. The second arm is focused on training and resource development to improve the capacity of the stakeholders (academia, healthcare professionals, policymakers, and the food industry) to utilise the findings generated by research in their respective fields. Finally, the N2RTU framework foresees its applications in artificial intelligence and the implementation of precision nutrition through the action of stakeholders.
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Affiliation(s)
- Anto Cordelia T. A. Dhanapal
- Centre for Biomedical and Nutrition Research, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Kampar 31900, Malaysia
| | - Ramatu Wuni
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, Reading RG6 6DZ, UK
| | - Eduard F. Ventura
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, Reading RG6 6DZ, UK
| | - Teh Kuan Chiet
- Centre for Community Health Studies (ReaCH), Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur 50300, Malaysia
| | - Eddy S. G. Cheah
- Centre for Biomedical and Nutrition Research, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Kampar 31900, Malaysia
| | - Annaletchumy Loganathan
- Centre for Biomedical and Nutrition Research, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Kampar 31900, Malaysia
| | - Phoon Lee Quen
- Centre for Biomedical and Nutrition Research, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Kampar 31900, Malaysia
| | - Mahenderan Appukutty
- Faculty of Sports Science and Recreation, Universiti Teknologi MARA, Shah Alam 40450, Malaysia
- Nutrition Society of Malaysia, Jalan PJS 1/48 off Jalan Klang Lama, Petaling Jaya 46150, Malaysia
| | - Mohd F. M. Noh
- Institute for Medical Research, National Institutes of Health, Jalan Setia Murni U13/52, Shah Alam 40170, Malaysia
| | - Ian Givens
- Institute for Food, Nutrition and Health (IFNH), University of Reading, Reading RG6 6AH, UK
| | - Karani Santhanakrishnan Vimaleswaran
- Hugh Sinclair Unit of Human Nutrition, Department of Food and Nutritional Sciences and Institute for Cardiovascular and Metabolic Research (ICMR), University of Reading, Reading RG6 6DZ, UK
- Institute for Food, Nutrition and Health (IFNH), University of Reading, Reading RG6 6AH, UK
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Wang F, Zheng J, Cheng J, Zou H, Li M, Deng B, Luo R, Wang F, Huang D, Li G, Zhang R, Ding X, Li Y, Du J, Yang Y, Kan J. Personalized nutrition: A review of genotype-based nutritional supplementation. Front Nutr 2022; 9:992986. [PMID: 36159456 PMCID: PMC9500586 DOI: 10.3389/fnut.2022.992986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 08/17/2022] [Indexed: 11/13/2022] Open
Abstract
Nutritional disorders have become a major public health issue, requiring increased targeted approaches. Personalized nutrition adapted to individual needs has garnered dramatic attention as an effective way to improve nutritional balance and maintain health. With the rapidly evolving fields of genomics and nutrigenetics, accumulation of genetic variants has been indicated to alter the effects of nutritional supplementation, suggesting its indispensable role in the genotype-based personalized nutrition. Additionally, the metabolism of nutrients, such as lipids, especially omega-3 polyunsaturated fatty acids, glucose, vitamin A, folic acid, vitamin D, iron, and calcium could be effectively improved with related genetic variants. This review focuses on existing literatures linking critical genetic variants to the nutrient and the ways in which these variants influence the outcomes of certain nutritional supplementations. Although further studies are required in this direction, such evidence provides valuable insights for the guidance of appropriate interventions using genetic information, thus paving the way for the smooth transition of conventional generic approach to genotype-based personalized nutrition.
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Affiliation(s)
| | | | - Junrui Cheng
- Department of Molecular and Structural Biochemistry, North Carolina State University, Kannapolis, NC, United States
| | - Hong Zou
- Sequanta Technologies Co., Ltd, Shanghai, China
| | | | - Bin Deng
- Nutrilite Health Institute, Guangzhou, China
| | - Rong Luo
- Nutrilite Health Institute, Guangzhou, China
| | - Feng Wang
- Nutrilite Health Institute, Guangzhou, China
| | | | - Gang Li
- Nutrilite Health Institute, Shanghai, China
| | - Rao Zhang
- School of Public Health, Institute of Nutrition and Health, Qingdao University, Qingdao, China
| | - Xin Ding
- School of Public Health, Institute of Nutrition and Health, Qingdao University, Qingdao, China
| | - Yuan Li
- Sequanta Technologies Co., Ltd, Shanghai, China
| | - Jun Du
- Nutrilite Health Institute, Shanghai, China
- Jun Du
| | - Yuexin Yang
- Chinese Center for Disease Control and Prevention, National Institute for Nutrition and Health, Beijing, China
- Yuexin Yang
| | - Juntao Kan
- Nutrilite Health Institute, Shanghai, China
- *Correspondence: Juntao Kan
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