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Sosa AL, Brucki SMD, Crivelli L, Lopera FJ, Acosta DM, Acosta‐Uribe J, Aguilar D, Aguilar‐Navarro SG, Allegri RF, Bertolucci PHF, Calandri IL, Carrillo MC, Mendez PAC, Cornejo‐Olivas M, Custodio N, Damian A, de Souza LC, Duran‐Aniotz C, García AM, García‐Peña C, Gonzales MM, Grinberg LT, Ibanez AM, Illanes‐Manrique MZ, Jack CR, Leon‐Salas JM, Llibre‐Guerra JJ, Luna‐Muñoz J, Matallana D, Miller BL, Naci L, Parra MA, Pericak‐Vance M, Piña‐Escudero SD, França Resende EDP, Ringman JM, Sevlever G, Slachevsky A, Suemoto CK, Valcour V, Villegas‐Lanau A, Yassuda MS, Mahinrad S, Sexton C. Advancements in dementia research, diagnostics, and care in Latin America: Highlights from the 2023 Alzheimer's Association International conference satellite symposium in Mexico City. Alzheimers Dement 2024; 20:5009-5026. [PMID: 38801124 PMCID: PMC11247679 DOI: 10.1002/alz.13850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 01/03/2024] [Indexed: 05/29/2024]
Abstract
INTRODUCTION While Latin America (LatAm) is facing an increasing burden of dementia due to the rapid aging of the population, it remains underrepresented in dementia research, diagnostics, and care. METHODS In 2023, the Alzheimer's Association hosted its eighth satellite symposium in Mexico, highlighting emerging dementia research, priorities, and challenges within LatAm. RESULTS Significant initiatives in the region, including intracountry support, showcased their efforts in fostering national and international collaborations; genetic studies unveiled the unique genetic admixture in LatAm; researchers conducting emerging clinical trials discussed ongoing culturally specific interventions; and the urgent need to harmonize practices and studies, improve diagnosis and care, and use affordable biomarkers in the region was highlighted. DISCUSSION The myriad of topics discussed at the 2023 AAIC satellite symposium highlighted the growing research efforts in LatAm, providing valuable insights into dementia biology, genetics, epidemiology, treatment, and care.
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Trigo AN, Muzzio M, Figueroa MI, Alfaro-Gómez EL, Bailliet G, Dopazo HJ, Dipierri JE. Apolipoprotein E Polymorphisms in Andean Population of Jujuy, Argentina. J Alzheimers Dis Rep 2024; 8:95-99. [PMID: 38312530 PMCID: PMC10836601 DOI: 10.3233/adr-230061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 12/13/2023] [Indexed: 02/06/2024] Open
Abstract
The pleiotropic nature of the apolipoprotein E (APOE) gene is associated with complex diseases in different populations. We analyzed APOE polymorphisms in 76 individuals from Jujuy - Argentina using NGS technology. The observed genotypes align with the expected Hardy-Weinberg equilibrium. APOE3 was the most common allele, followed by APOE4 and APOE2. The allele distribution pattern is consistent with findings in previously studied populations of Native Americans and Asians. The E4 allele's low frequency, always observed in a heterozygous state, raises questions regarding its relevance in explaining dementia and longevity associated with this marker in the Central Andes.
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Affiliation(s)
- Arturo Nicolás Trigo
- Genetics Unit, Maternal and Child Hospital “Dr. Hector Quintana”, Jujuy, Argentina
| | - Marina Muzzio
- Multidisciplinary Institute of Cellular Biology (IMBICE – CONICET – UNLP – CIC), La Plata, Argentina
| | - Marcelo Isidro Figueroa
- Genetics Unit, Maternal and Child Hospital “Dr. Hector Quintana”, Jujuy, Argentina
- Institute of Andean Ecoregions (INECOA – UNJu – CONICET), Jujuy, Argentina
| | - Emma Laura Alfaro-Gómez
- Institute of Andean Ecoregions (INECOA – UNJu – CONICET), Jujuy, Argentina
- Institute of Biology of the Altitude (INBIAL – UNJu), Jujuy, Argentina
| | - Graciela Bailliet
- Multidisciplinary Institute of Cellular Biology (IMBICE – CONICET – UNLP – CIC), La Plata, Argentina
| | - Hernán Javier Dopazo
- Institute of Ecology, Genetics and Evolution of Buenos Aires (IEGEBA – UBA – CONICET), Ciudad Autónoma de Buenos Aires, Argentina
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Nguyen HXT, Bradley K, McNamara BJ, Watson R, Malay R, LoGiudice D. Risk, protective, and biomarkers of dementia in Indigenous peoples: A systematic review. Alzheimers Dement 2024; 20:563-592. [PMID: 37746888 PMCID: PMC10917055 DOI: 10.1002/alz.13458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 08/10/2023] [Accepted: 08/13/2023] [Indexed: 09/26/2023]
Abstract
INTRODUCTION Dementia is an emergent health priority for Indigenous peoples worldwide, yet little is known about disease drivers and protective factors. METHODS Database searches were conducted in March 2022 to identify original publications on risk, protective, genetic, neuroradiological, and biological factors related to dementia and cognitive impairment involving Indigenous peoples. RESULTS Modifiable risk factors featured across multiple studies include childhood adversity, hearing loss, low education attainment, unskilled work history, stroke, head injury, epilepsy, diabetes, hypertension, hyperlipidemia, depression, low BMI, poor mobility, and continence issues. Non-modifiable risk factors included increasing age, sex, and genetic polymorphisms. Education, ex-smoking, physical and social activity, and engagement with cultural or religious practices were highlighted as potential protective factors. There is a paucity of research on dementia biomarkers involving Indigenous peoples. DISCUSSION Greater understanding of modifiable factors and biomarkers of dementia can assist in strength-based models to promote healthy ageing and cognition for Indigenous peoples.
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Affiliation(s)
- Huong X. T. Nguyen
- Department of MedicineRoyal Melbourne HospitalMelbourneVictoriaAustralia
- Department of Population Health and ImmunityWalter and Eliza Hall Institute of Medical ResearchMelbourneVictoriaAustralia
| | - Kate Bradley
- Department of MedicineRoyal Melbourne HospitalMelbourneVictoriaAustralia
| | - Bridgette J. McNamara
- Centre for Epidemiology and BiostatisticsUniversity of MelbourneVictoriaAustralia
- Barwon South‐West Public Health UnitBarwon HealthGeelongVictoriaAustralia
| | - Rosie Watson
- Department of MedicineRoyal Melbourne HospitalMelbourneVictoriaAustralia
- Department of Population Health and ImmunityWalter and Eliza Hall Institute of Medical ResearchMelbourneVictoriaAustralia
| | - Roslyn Malay
- Western Australian Centre for Health and AgeingUniversity of Western AustraliaPerthWAAustralia
| | - Dina LoGiudice
- Department of MedicineRoyal Melbourne HospitalMelbourneVictoriaAustralia
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Brugger SW, Davis MF. Influence of Admixture on Phenotypes. Curr Protoc 2023; 3:e953. [PMID: 38146906 DOI: 10.1002/cpz1.953] [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] [Indexed: 12/27/2023]
Abstract
Individuals of European descent have historically been the focus of genetic studies and possess relatively homogenous genomes. As a result, analytical methods have been developed and optimized with such genomes in mind. African-descent and Latino individuals generally possess genomes of greater architectural complexity due to mosaic genomic ancestry, which can extensively and intricately impact phenotypic expression. As such, genetic analyses of admixed individuals require that genetic admixture be quantified to accurately model the impact of genetic variation on phenotypic expression. In this overview, we explore how fundamental genetic concepts such as linkage disequilibrium and differential allele frequency interact with genetic admixture to uniquely influence phenotypes in admixed individuals. © 2023 The Authors. Current Protocols published by Wiley Periodicals LLC.
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Affiliation(s)
- Steven W Brugger
- Department of Molecular Biology and Microbiology, Brigham Young University, Provo, Utah
| | - Mary F Davis
- Department of Molecular Biology and Microbiology, Brigham Young University, Provo, Utah
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Belloy ME, Andrews SJ, Le Guen Y, Cuccaro M, Farrer LA, Napolioni V, Greicius MD. APOE Genotype and Alzheimer Disease Risk Across Age, Sex, and Population Ancestry. JAMA Neurol 2023; 80:1284-1294. [PMID: 37930705 PMCID: PMC10628838 DOI: 10.1001/jamaneurol.2023.3599] [Citation(s) in RCA: 28] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 08/03/2023] [Indexed: 11/07/2023]
Abstract
Importance Apolipoprotein E (APOE)*2 and APOE*4 are, respectively, the strongest protective and risk-increasing, common genetic variants for late-onset Alzheimer disease (AD), making APOE status highly relevant toward clinical trial design and AD research broadly. The associations of APOE genotypes with AD are modulated by age, sex, race and ethnicity, and ancestry, but these associations remain unclear, particularly among racial and ethnic groups understudied in the AD and genetics research fields. Objective To assess the stratified associations of APOE genotypes with AD risk across sex, age, race and ethnicity, and global population ancestry. Design, Setting, Participants This genetic association study included case-control, family-based, population-based, and longitudinal AD-related cohorts that recruited referred and volunteer participants. Data were analyzed between March 2022 and April 2023. Genetic data were available from high-density, single-nucleotide variant microarrays, exome microarrays, and whole-exome and whole-genome sequencing. Summary statistics were ascertained from published AD genetic studies. Main Outcomes and Measures The main outcomes were risk for AD (odds ratios [ORs]) and risk of conversion to AD (hazard ratios [HRs]), with 95% CIs. Risk for AD was evaluated through case-control logistic regression analyses. Risk of conversion to AD was evaluated through Cox proportional hazards regression survival analyses. Results Among 68 756 unique individuals, analyses included 21 852 East Asian (demographic data not available), 5738 Hispanic (68.2% female; mean [SD] age, 75.4 [8.8] years), 7145 non-Hispanic Black (hereafter referred to as Black) (70.8% female; mean [SD] age, 78.4 [8.2] years), and 34 021 non-Hispanic White (hereafter referred to as White) (59.3% female; mean [SD] age, 77.0 [9.1] years) individuals. There was a general, stepwise pattern of ORs for APOE*4 genotypes and AD risk across race and ethnicity groups. Odds ratios for APOE*34 and AD risk attenuated following East Asian (OR, 4.54; 95% CI, 3.99-5.17),White (OR, 3.46; 95% CI, 3.27-3.65), Black (OR, 2.18; 95% CI, 1.90-2.49) and Hispanic (OR, 1.90; 95% CI, 1.65-2.18) individuals. Similarly, ORs for APOE*22+23 and AD risk attenuated following White (OR, 0.53, 95% CI, 0.48-0.58), Black (OR, 0.69, 95% CI, 0.57-0.84), and Hispanic (OR, 0.89; 95% CI, 0.72-1.10) individuals, with no association for Hispanic individuals. Deviating from the global pattern of ORs, APOE*22+23 was not associated with AD risk in East Asian individuals (OR, 0.97; 95% CI, 0.77-1.23). Global population ancestry could not explain why Hispanic individuals showed APOE associations with less pronounced AD risk compared with Black and White individuals. Within Black individuals, decreased global African ancestry or increased global European ancestry showed a pattern of APOE*4 dosage associated with increasing AD risk, but no such pattern was apparent for APOE*2 dosage with AD risk. The sex-by-age-specific interaction effect of APOE*34 among White individuals (higher risk in women) was reproduced but shifted to ages 60 to 70 years (OR, 1.48; 95% CI, 1.10-2.01) and was additionally replicated in a meta-analysis of Black individuals and Hispanic individuals (OR, 1.72; 95% CI, 1.01-2.94). Conclusion and Relevance Through recent advances in AD-related genetic cohorts, this study provided the largest-to-date overview of the association of APOE with AD risk across age, sex, race and ethnicity, and population ancestry. These novel insights are critical to guide AD clinical trial design and research.
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Affiliation(s)
- Michael E. Belloy
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, California
- NeuroGenomics and Informatics Center, Washington University School of Medicine, St. Louis, Missouri
- Department of Neurology, Washington University School of Medicine, St. Louis, Missouri
| | - Shea J. Andrews
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco
| | - Yann Le Guen
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, California
| | - Michael Cuccaro
- John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, Florida
- Dr. John T. Macdonald Foundation, Department of Human Genetics, University of Miami Miller School of Medicine, Miami, Florida
| | - Lindsay A. Farrer
- Department of Medicine, Biomedical Genetics, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts
- Department of Neurology, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts
- Department of Ophthalmology, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts
- Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts
- Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts
| | - Valerio Napolioni
- School of Biosciences and Veterinary Medicine, University of Camerino, Camerino, Italy
| | - Michael D. Greicius
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, California
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Lambert JC, Ramirez A, Grenier-Boley B, Bellenguez C. Step by step: towards a better understanding of the genetic architecture of Alzheimer's disease. Mol Psychiatry 2023; 28:2716-2727. [PMID: 37131074 PMCID: PMC10615767 DOI: 10.1038/s41380-023-02076-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 04/12/2023] [Accepted: 04/14/2023] [Indexed: 05/04/2023]
Abstract
Alzheimer's disease (AD) is considered to have a large genetic component. Our knowledge of this component has progressed over the last 10 years, thanks notably to the advent of genome-wide association studies and the establishment of large consortia that make it possible to analyze hundreds of thousands of cases and controls. The characterization of dozens of chromosomal regions associated with the risk of developing AD and (in some loci) the causal genes responsible for the observed disease signal has confirmed the involvement of major pathophysiological pathways (such as amyloid precursor protein metabolism) and opened up new perspectives (such as the central role of microglia and inflammation). Furthermore, large-scale sequencing projects are starting to reveal the major impact of rare variants - even in genes like APOE - on the AD risk. This increasingly comprehensive knowledge is now being disseminated through translational research; in particular, the development of genetic risk/polygenic risk scores is helping to identify the subpopulations more at risk or less at risk of developing AD. Although it is difficult to assess the efforts still needed to comprehensively characterize the genetic component of AD, several lines of research can be improved or initiated. Ultimately, genetics (in combination with other biomarkers) might help to redefine the boundaries and relationships between various neurodegenerative diseases.
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Affiliation(s)
- Jean-Charles Lambert
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1167-RID-AGE Facteurs de risque et déterminants moléculaires des maladies liées au vieillissement, Lille, France.
| | - Alfredo Ramirez
- Division of Neurogenetics and Molecular Psychiatry, Department of Psychiatry and Psychotherapy, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Department of Neurodegenerative diseases and Geriatric Psychiatry, University Hospital Bonn, Medical Faculty, Bonn, Germany
- Department of Psychiatry & Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, San Antonio, TX, USA
- German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany
- Cluster of Excellence Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Benjamin Grenier-Boley
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1167-RID-AGE Facteurs de risque et déterminants moléculaires des maladies liées au vieillissement, Lille, France
| | - Céline Bellenguez
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1167-RID-AGE Facteurs de risque et déterminants moléculaires des maladies liées au vieillissement, Lille, France
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Huggins LKL, Min SH, Kaplan S, Wei J, Welsh-Bohmer K, Xu H. Meta-Analysis of Variations in Association between APOE ɛ4 and Alzheimer's Disease and Related Dementias Across Hispanic Regions of Origin. J Alzheimers Dis 2023; 93:1095-1109. [PMID: 37182874 PMCID: PMC10441171 DOI: 10.3233/jad-221167] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
BACKGROUND Emerging research has shown racial and ethnic variations in the magnitude of association between the apolipoprotein ɛ4 (APOE ɛ4) allele and the risk of developing Alzheimer's disease and related dementias (ADRD). Studies researching this association among Hispanic groups within and outside of the United States have produced inconsistent results. OBJECTIVE To examine the association between the APOE ɛ4 allele and the risk of developing ADRD in global Hispanic populations from different ethnic regions of origin. METHODS PubMed, Embase, Scopus, and PsycInfo were searched for studies relating to Hispanic/Latin American origin, APOE ɛ4, and ADRD. Odds ratios (OR) of ADRD risk for individuals with APOE ɛ4 versus those without APOE ɛ4 were extracted and calculated using random effects analysis. RESULTS 20 eligible studies represented Caribbean Hispanic, Mexican, South American, Spanish, and Cuban groups. Overall, APOE ɛ4 was significantly associated with increased risk of ADRD (Odds Ratio [OR] 3.80, 95% CI: 2.38-6.07). The association was only significant in the South American (OR: 4.61, 95% CI: 2.74-7.75) subgroup. CONCLUSION There was an association between APOE ɛ4 and increased ADRD risk for the South American subgroup. The strength of this association varied across Hispanic subgroups. Data is limited with more studies especially needed for adjusted analysis on Spanish, Central American, Cuban Hispanic, and Caribbean Hispanic groups. Results suggest additional environmental or genetic risk factors are associated with ethnic variations.
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Affiliation(s)
- Lenique KL Huggins
- Department of Biology, Duke University, Durham, NC, USA
- Yale School of Medicine, New Haven, CT, USA
| | - Se Hee Min
- Columbia University School of Nursing, New York, NY, USA
| | - Samantha Kaplan
- Duke University Medical Center Library and Archives, Durham, NC, USA
| | - Jingkai Wei
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | - Kathleen Welsh-Bohmer
- Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, USA
- Department of Neurology, Duke University School of Medicine, Durham, NC, USA
| | - Hanzhang Xu
- Duke University School of Nursing, Durham, NC, USA
- Department of Family Medicine and Community Health, Duke University School of Medicine, Durham, NC, USA
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Naslavsky MS, Suemoto CK, Brito LA, Scliar MO, Ferretti-Rebustini RE, Rodriguez RD, Leite REP, Araujo NM, Borda V, Tarazona-Santos E, Jacob-Filho W, Pasqualucci C, Nitrini R, Yaffe K, Zatz M, Grinberg LT. Global and local ancestry modulate APOE association with Alzheimer's neuropathology and cognitive outcomes in an admixed sample. Mol Psychiatry 2022; 27:4800-4808. [PMID: 36071110 PMCID: PMC9734036 DOI: 10.1038/s41380-022-01729-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 07/10/2022] [Accepted: 07/26/2022] [Indexed: 02/05/2023]
Abstract
Dementia is more prevalent in Blacks than in Whites, likely due to a combination of environmental and biological factors. Paradoxically, clinical studies suggest an attenuation of APOE ε4 risk of dementia in African ancestry (AFR), but a dearth of neuropathological data preclude the interpretation of the biological factors underlying these findings, including the association between APOE ε4 risk and Alzheimer's disease (AD) pathology, the most frequent cause of dementia. We investigated the interaction between African ancestry, AD-related neuropathology, APOE genotype, and functional cognition in a postmortem sample of 400 individuals with a range of AD pathology severity and lack of comorbid neuropathology from a cohort of community-dwelling, admixed Brazilians. Increasing proportions of African ancestry (AFR) correlated with a lower burden of neuritic plaques (NP). However, for individuals with a severe burden of NP and neurofibrillary tangles (NFT), AFR proportion was associated with worse Clinical Dementia Rating sum of boxes (CDR-SOB). Among APOE ε4 carriers, the association between AFR proportion and CDR-SOB disappeared. APOE local ancestry inference of a subset of 309 individuals revealed that, in APOE ε4 noncarriers, non-European APOE background correlated with lower NP burden and, also, worse cognitive outcomes than European APOE when adjusting by NP burden. Finally, APOE ε4 was associated with worse AD neuropathological burden only in a European APOE background. APOE genotype and its association with AD neuropathology and clinical pattern are highly influenced by ancestry, with AFR associated with lower NP burden and attenuated APOE ε4 risk compared to European ancestry.
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Affiliation(s)
- Michel Satya Naslavsky
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, University of São Paulo, São Paulo, SP, Brazil
- Human Genome and Stem Cell Research Center, University of São Paulo, São Paulo, SP, Brazil
- Hospital Israelita Albert Einstein, São Paulo, SP, Brazil
| | - Claudia K Suemoto
- Division of Geriatrics, University of São Paulo Medical School, São Paulo, SP, Brazil
| | - Luciano Abreu Brito
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, University of São Paulo, São Paulo, SP, Brazil
- Human Genome and Stem Cell Research Center, University of São Paulo, São Paulo, SP, Brazil
| | | | - Renata Eloah Ferretti-Rebustini
- Escola de Enfermagem, Programa de Pós-Graduação em Enfermagem na Saúde do Adulto, University of São Paulo, São Paulo, SP, Brazil
| | | | - Renata E P Leite
- Department of Pathology, LIM-22, University of São Paulo Medical School, São Paulo, SP, Brazil
| | - Nathalia Matta Araujo
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Victor Borda
- University of Maryland School of Medicine, Baltimore, MD, USA
| | - Eduardo Tarazona-Santos
- Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Wilson Jacob-Filho
- Division of Geriatrics, University of São Paulo Medical School, São Paulo, SP, Brazil
| | - Carlos Pasqualucci
- Department of Pathology, LIM-22, University of São Paulo Medical School, São Paulo, SP, Brazil
| | - Ricardo Nitrini
- Department of Neurology, University of São Paulo Medical School, São Paulo, SP, Brazil
| | - Kristine Yaffe
- Department of Psychiatry, Neurology, and Epidemiology and Biostatistics, University of California, San Francisco, CA, USA
- VA Medical Center, San Francisco, San Francisco, CA, USA
| | - Mayana Zatz
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, University of São Paulo, São Paulo, SP, Brazil
- Human Genome and Stem Cell Research Center, University of São Paulo, São Paulo, SP, Brazil
| | - Lea T Grinberg
- Department of Pathology, LIM-22, University of São Paulo Medical School, São Paulo, SP, Brazil.
- Memory and Aging Center, Department of Neurology, and Pathology, University of California, San Francisco, San Francisco, CA, USA.
- Global brain Health Institute, University of California, San Francisco, San Francisco, CA, USA.
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Harerimana NV, Goate AM, Bowles KR. The influence of 17q21.31 and APOE genetic ancestry on neurodegenerative disease risk. Front Aging Neurosci 2022; 14:1021918. [PMID: 36337698 PMCID: PMC9632173 DOI: 10.3389/fnagi.2022.1021918] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 09/26/2022] [Indexed: 09/08/2024] Open
Abstract
Advances in genomic research over the last two decades have greatly enhanced our knowledge concerning the genetic landscape and pathophysiological processes involved in multiple neurodegenerative diseases. However, current insights arise almost exclusively from studies on individuals of European ancestry. Despite this, studies have revealed that genetic variation differentially impacts risk for, and clinical presentation of neurodegenerative disease in non-European populations, conveying the importance of ancestry in predicting disease risk and understanding the biological mechanisms contributing to neurodegeneration. We review the genetic influence of two important disease-associated loci, 17q21.31 (the "MAPT locus") and APOE, to neurodegenerative disease risk in non-European populations, touching on global population differences and evolutionary genetics by ancestry that may underlie some of these differences. We conclude there is a need to increase representation of non-European ancestry individuals in genome-wide association studies (GWAS) and biomarker analyses in order to help resolve existing disparities in understanding risk for, diagnosis of, and treatment for neurodegenerative diseases in diverse populations.
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Affiliation(s)
- Nadia V. Harerimana
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Ronald M. Loeb Center for Alzheimer’s Disease, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Icahn Genomics Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Alison M. Goate
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Ronald M. Loeb Center for Alzheimer’s Disease, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Icahn Genomics Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Estelle and Daniel Maggin Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Kathryn R. Bowles
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Ronald M. Loeb Center for Alzheimer’s Disease, Icahn School of Medicine at Mount Sinai, New York, NY, United States
- Icahn Genomics Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States
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Ju D, Hui D, Hammond DA, Wonkam A, Tishkoff SA. Importance of Including Non-European Populations in Large Human Genetic Studies to Enhance Precision Medicine. Annu Rev Biomed Data Sci 2022; 5:321-339. [PMID: 35576557 PMCID: PMC9904154 DOI: 10.1146/annurev-biodatasci-122220-112550] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
One goal of genomic medicine is to uncover an individual's genetic risk for disease, which generally requires data connecting genotype to phenotype, as done in genome-wide association studies (GWAS). While there may be clinical promise to employing prediction tools such as polygenic risk scores (PRS), it currently stands that individuals of non-European ancestry may not reap the benefits of genomic medicine because of underrepresentation in large-scale genetics studies. Here, we discuss why this inequity poses a problem for genomic medicine and the reasons for the low transferability of PRS across populations. We also survey the ancestry representation of published GWAS and investigate how estimates of ancestry diversity in GWASparticipants might be biased. We highlight the importance of expanding genetic research in Africa, one of the most underrepresented regions in human genomics research, and discuss issues of ethics, resources, and technology for equitable advancement of genomic medicine.
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Affiliation(s)
- Dan Ju
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
| | - Daniel Hui
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
- Graduate Program in Genomics and Computational Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Dorothy A Hammond
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
- Penn Center for Global Genomics & Health Equity, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ambroise Wonkam
- Division of Human Genetics, Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Department of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA;
| | - Sarah A Tishkoff
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
- Department of Biology, School of Arts and Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Factors Influencing Alzheimer's Disease Risk: Whether and How They are Related to the APOE Genotype. Neurosci Bull 2022; 38:809-819. [PMID: 35149974 PMCID: PMC9276873 DOI: 10.1007/s12264-021-00814-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 11/25/2021] [Indexed: 11/21/2022] Open
Abstract
Alzheimer's disease (AD) is the most prevalent neurodegenerative disease featuring progressive cognitive impairment. Although the etiology of late-onset AD remains unclear, the close association of AD with apolipoprotein E (APOE), a gene that mainly regulates lipid metabolism, has been firmly established and may shed light on the exploration of AD pathogenesis and therapy. However, various confounding factors interfere with the APOE-related AD risk, raising questions about our comprehension of the clinical findings concerning APOE. In this review, we summarize the most debated factors interacting with the APOE genotype and AD pathogenesis, depict the extent to which these factors relate to APOE-dependent AD risk, and discuss the possible underlying mechanisms.
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Granot‐Hershkovitz E, Tarraf W, Kurniansyah N, Daviglus M, Isasi CR, Kaplan R, Lamar M, Perreira KM, Wassertheil‐Smoller S, Stickel A, Thyagarajan B, Zeng D, Fornage M, DeCarli CS, González HM, Sofer T. APOE alleles' association with cognitive function differs across Hispanic/Latino groups and genetic ancestry in the study of Latinos-investigation of neurocognitive aging (HCHS/SOL). Alzheimers Dement 2021; 17:466-474. [PMID: 33155766 PMCID: PMC8016734 DOI: 10.1002/alz.12205] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
INTRODUCTION Apolipoprotein E (APOE) alleles are associated with cognitive decline, mild cognitive impairment (MCI), and Alzheimer's disease in Whites, but have weaker and inconsistent effects reported in Latinos. We hypothesized that this heterogeneity is due to ancestry-specific genetic effects. METHODS We investigated the associations of the APOE alleles with significant cognitive decline and MCI in 4183 Latinos, stratified by six Latino backgrounds, and explored whether the proportion of continental genetic ancestry (European, African, and Amerindian) modifies these associations. RESULTS APOE ε4 was associated with an increased risk of significant cognitive decline (odds ratio [OR] = 1.15, P-value = 0.03), with the strongest association in Cubans (OR = 1.46, P-value = 0.007). APOE-ε2 was associated with decreased risk of MCI (OR = 0.37, P-value = 0.04) in Puerto Ricans. Amerindian genetic ancestry was found to protect from the risk conferred by APOE ε4 on significant cognitive decline. DISCUSSION Results suggest that APOE alleles' effects on cognitive outcomes differ across six Latino backgrounds and are modified by continental genetic ancestry.
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Affiliation(s)
- Einat Granot‐Hershkovitz
- Division of Sleep and Circadian DisordersDepartment of Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
- Department of MedicineHarvard Medical SchoolBostonMassachusettsUSA
| | - Wassim Tarraf
- Institute of GerontologyWayne State UniversityDetroitMichiganUSA
| | - Nuzulul Kurniansyah
- Division of Sleep and Circadian DisordersDepartment of Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Martha Daviglus
- Department of Medicine, Institute for Minority Health ResearchUniversity of Illinois at ChicagoChicagoIllinoisUSA
| | - Carmen R. Isasi
- Department of Epidemiology & Population HealthDepartment of PediatricsAlbert Einstein College of MedicineBronxNew YorkUSA
| | - Robert Kaplan
- Department of Epidemiology & Population HealthDepartment of PediatricsAlbert Einstein College of MedicineBronxNew YorkUSA
- Division of Public Health SciencesFred Hutchinson Cancer Research CenterSeattleWashingtonUSA
| | - Melissa Lamar
- Department of Medicine, Institute for Minority Health ResearchUniversity of Illinois at ChicagoChicagoIllinoisUSA
- Rush Alzheimer's Disease Research CenterRush University Medical CenterChicagoIllinoisUSA
| | - Krista M. Perreira
- Department of Social MedicineUniversity of North Carolina School of MedicineChapel HillNorth CarolinaUSA
| | - Sylvia Wassertheil‐Smoller
- Department of Epidemiology & Population HealthDepartment of PediatricsAlbert Einstein College of MedicineBronxNew YorkUSA
| | - Ariana Stickel
- Department of Neurosciences and Shiley‐Marcos Alzheimer's Disease CenterUniversity of California, San DiegoLa JollaCaliforniaUSA
| | - Bharat Thyagarajan
- Department of Laboratory Medicine and PathologyUniversity of MinnesotaMinneapolisMinnesotaUSA
| | - Donglin Zeng
- Department of Biostatistics, Gillings School of Global Public HealthUniversity of North CarolinaChapel HillNorth CarolinaUSA
| | - Myriam Fornage
- Institute of Molecular MedicineThe University of Texas Health Science Center at HoustonHoustonTexasUSA
| | - Charles S. DeCarli
- Department of NeurologyCenter for NeuroscienceUniversity of California at DavisSacramentoCaliforniaUSA
| | - Hector M. González
- Department of Neurosciences and Shiley‐Marcos Alzheimer's Disease CenterUniversity of California, San DiegoLa JollaCaliforniaUSA
| | - Tamar Sofer
- Division of Sleep and Circadian DisordersDepartment of Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
- Department of MedicineHarvard Medical SchoolBostonMassachusettsUSA
- Department of BiostatisticsHarvard T.H. Chan School of Public HealthBostonMassachusettsUSA
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