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Rousset RZ, den Braber A, Verberk IMW, Boonkamp L, Wilson DH, Ligthart L, Teunissen CE, de Geus EJC. Heritability of Alzheimer's disease plasma biomarkers: A nuclear twin family design. Alzheimers Dement 2025; 21:e14269. [PMID: 39588748 PMCID: PMC11775461 DOI: 10.1002/alz.14269] [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: 05/17/2024] [Revised: 08/23/2024] [Accepted: 08/27/2024] [Indexed: 11/27/2024]
Abstract
INTRODUCTION Alzheimer's disease (AD) is a highly heritable disease (60%-80%). Amyloid beta (Aβ) 42/40, neurofilament light chain (NfL), and glial fibrillary acidic protein (GFAP) are plasma biomarkers for AD. Clinical biomarker research would be served by an understanding of the sources of variance in these markers. METHODS Blood concentrations of Aβ42/40, NfL, and GFAP of twins and their families (monozygotic twins: 1574, dizygotic twins: 1266, other: 3657) were analyzed on the Simoa HD-X. Twin-family models were used to estimate proportional genetic contributions to the variance in biomarker levels. RESULTS Heritability estimates were 16% for Aβ42/40, 42% for NfL, and 60% for GFAP. NfL and GFAP were significantly correlated with each other (0.37) but not with Aβ42/40. DISCUSSION The heritability of Aβ42/40 (16%) is lower than the heritability of AD, suggesting strong environmental influences on this biomarker. The lack of correlation between NfL/GFAP and Aβ42/40 indicates these markers may be on different biological pathways. HIGHLIGHTS Heritability is found for glial fibrillary acidic protein (60%), neurofilament light chain (42%), and amyloid beta (Aβ) 42/40 (16%) plasma levels. Aβ42/40 plasma levels are sensitive to person-specific environmental influences.
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Affiliation(s)
- Rebecca Z. Rousset
- Neurochemistry LaboratoryDepartment of Clinical ChemistryAmsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam NeuroscienceAmsterdamThe Netherlands
| | - Anouk den Braber
- Alzheimer CenterDepartment of NeurologyAmsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam NeuroscienceAmsterdamThe Netherlands
- Department of Biological PsychologyVrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Inge M. W. Verberk
- Neurochemistry LaboratoryDepartment of Clinical ChemistryAmsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam NeuroscienceAmsterdamThe Netherlands
| | - Lynn Boonkamp
- Neurochemistry LaboratoryDepartment of Clinical ChemistryAmsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam NeuroscienceAmsterdamThe Netherlands
| | | | - Lannie Ligthart
- Department of Biological PsychologyVrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Charlotte E. Teunissen
- Neurochemistry LaboratoryDepartment of Clinical ChemistryAmsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam NeuroscienceAmsterdamThe Netherlands
| | - Eco J. C. de Geus
- Department of Biological PsychologyVrije Universiteit AmsterdamAmsterdamThe Netherlands
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Xia Q, Anwar U, Weijian Y, Yingshuai W, Hui L. Genetic characteristics of spouse selection based on short tandem repeats in DNA and lunula count on fingertip. Genes Environ 2023; 45:26. [PMID: 37864262 PMCID: PMC10588066 DOI: 10.1186/s41021-023-00281-6] [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: 04/10/2023] [Accepted: 09/26/2023] [Indexed: 10/22/2023] Open
Abstract
OBJECTIVE The aim of this study was to assess the correlation of spouse selection with short tandem repeats (STRs) in DNA and with the number of fingertip lunulae to investigate the role of heredity in spouse selection. METHODS We randomly selected a total of 286 couples (husband and wife) as a couple group while 200 paired subjects (a man randomly matched with a woman as a pair of subjects) were selected as a non-spouse group for DNA typing, and to investigate lunulae in spouse selection, a total of 554 couples were selected as a couple group and 500 pairs of subjects were selected as a control group. RESULTS A significant difference of STR matching number (a large value implies a higher genetic similarity) between spouse group and non-spouse group were observed (12.3 ± 2.7 vs. 11.8 ± 2.6; p < 0.05). A significant difference of the lunula matching number (difference of lunula counts between a paired subjects, a lower value implies a higher genetic similarity) between two groups were also observed for the lunula counts (1.55 ± 1.88 vs. 3.53 ± 2.40; p < 0.01). CONCLUSION Significant and unprecedented relationships were found between the couples and polymorphic STRs, and between spouse selection and lunula counts. Polymorphic STRs and fingertip lunulae counts provide an initial insight into the potentially important contributions that genetic characteristics may play a key role in spouse selection.
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Affiliation(s)
- Qi Xia
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, China
| | - Ullah Anwar
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, China
| | - Yu Weijian
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, China
| | - Wang Yingshuai
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, China
| | - Liu Hui
- College of Medical Laboratory, Dalian Medical University, Dalian, 116044, China.
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Murray DR, Moran JB, Prokosch ML, Kerry N. No evidence for a relationship between MHC heterozygosity and life history strategy in a sample of North American undergraduates. Sci Rep 2020; 10:10140. [PMID: 32576939 PMCID: PMC7311407 DOI: 10.1038/s41598-020-67406-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 06/08/2020] [Indexed: 12/05/2022] Open
Abstract
Although allelic diversity at the major histocompatibility complex (MHC) has implications for adaptive immunity, mate choice, and social signalling, how diversity at the MHC influences the calibration of life history strategies remains largely uninvestigated. The current study investigated whether greater MHC heterozygosity was associated with markers of slower life history strategies in a sample of 789 North American undergraduates. Contrary to preregistered predictions and to previously published findings, MHC heterozygosity was not related to any of the psychological life history-relevant variables measured (including short- vs. long-term sexual strategy, temporal discounting, the Arizona life history battery, past and current health, disgust sensitivity, and Big Five personality traits). Further, no meaningful effects emerged when analysing women and men separately. Possible reasons for why the current results are inconsistent with previous work are discussed.
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Affiliation(s)
- Damian R Murray
- Department of Psychology, Tulane University, 2007 Percival Stern Hall, New Orleans, LA, 70118, USA.
| | - James B Moran
- Department of Psychology, Tulane University, 2007 Percival Stern Hall, New Orleans, LA, 70118, USA
| | - Marjorie L Prokosch
- Department of Psychology, Tulane University, 2007 Percival Stern Hall, New Orleans, LA, 70118, USA
| | - Nicholas Kerry
- Department of Psychology, Tulane University, 2007 Percival Stern Hall, New Orleans, LA, 70118, USA
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Havlíček J, Winternitz J, Roberts SC. Major histocompatibility complex-associated odour preferences and human mate choice: near and far horizons. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190260. [PMID: 32306884 PMCID: PMC7209936 DOI: 10.1098/rstb.2019.0260] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/16/2019] [Indexed: 12/11/2022] Open
Abstract
The major histocompatibility complex (MHC) is a core part of the adaptive immune system. As in other vertebrate taxa, it may also affect human chemical communication via odour-based mate preferences, with greater attraction towards MHC-dissimilar partners. However, despite some well-known findings, the available evidence is equivocal and made complicated by varied approaches to quantifying human mate choice. To address this, we here conduct comprehensive meta-analyses focusing on studies assessing: (i) genomic mate selection, (ii) relationship satisfaction, (iii) odour preference, and (iv) all studies combined. Analysis of genomic studies reveals no association between MHC-dissimilarity and mate choice in actual couples; however, MHC effects appear to be independent of the genomic background. The effect of MHC-dissimilarity on relationship satisfaction was not significant, and we found evidence for publication bias in studies on this area. There was also no significant association between MHC-dissimilarity and odour preferences. Finally, combining effect sizes from all genomic, relationship satisfaction, odour preference and previous mate choice studies into an overall estimate showed no overall significant effect of MHC-similarity on human mate selection. Based on these findings, we make a set of recommendations for future studies, focusing both on aspects that should be implemented immediately and those that lurk on the far horizon. We need larger samples with greater geographical and cultural diversity that control for genome-wide similarity. We also need more focus on mechanisms of MHC-associated odour preferences and on MHC-associated pregnancy loss. This article is part of the Theo Murphy meeting issue 'Olfactory communication in humans'.
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Affiliation(s)
- Jan Havlíček
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, 128 42 Prague 2, Czech Republic
| | - Jamie Winternitz
- Department of Animal Behaviour, Bielefeld University, Bielefeld 33615, Germany
| | - S. Craig Roberts
- Division of Psychology, University of Stirling, Stirling FK9 4LA, UK
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Dandine-Roulland C, Laurent R, Dall'Ara I, Toupance B, Chaix R. Genomic evidence for MHC disassortative mating in humans. Proc Biol Sci 2020; 286:20182664. [PMID: 30890093 DOI: 10.1098/rspb.2018.2664] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Although pervasive in many animal species, the evidence for major histocompatibility complex (MHC) disassortative mating in humans remains inconsistent across studies. Here, to revisit this issue, we analyse dense genotype data for 883 European and Middle Eastern couples. To distinguish MHC-specific effects from socio-cultural confounders, the pattern of relatedness between spouses in the MHC region is compared to the rest of the genome. Couples from Israel exhibit no significant pattern of relatedness across the MHC region, whereas across the genome, they are more similar than random pairs of individuals, which may reflect social homogamy and/or cousin marriages. On the other hand, couples from The Netherlands and more generally from Northern Europe are significantly more MHC-dissimilar than random pairs of individuals, and this pattern of dissimilarity is extreme when compared with the rest of the genome. Our findings support the hypothesis that the MHC influences mate choice in humans in a context-dependent way: MHC-driven preferences may exist in all populations but, in some populations, social constraints over mate choice may reduce the ability of individuals to rely on such biological cues when choosing their mates.
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Affiliation(s)
- Claire Dandine-Roulland
- Eco-Anthropologie, UMR 7206, CNRS, MNHN, Université Paris Diderot , Sorbonne Paris Cité, Paris , France
| | - Romain Laurent
- Eco-Anthropologie, UMR 7206, CNRS, MNHN, Université Paris Diderot , Sorbonne Paris Cité, Paris , France
| | - Irene Dall'Ara
- Eco-Anthropologie, UMR 7206, CNRS, MNHN, Université Paris Diderot , Sorbonne Paris Cité, Paris , France
| | - Bruno Toupance
- Eco-Anthropologie, UMR 7206, CNRS, MNHN, Université Paris Diderot , Sorbonne Paris Cité, Paris , France
| | - Raphaëlle Chaix
- Eco-Anthropologie, UMR 7206, CNRS, MNHN, Université Paris Diderot , Sorbonne Paris Cité, Paris , France
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Nishi A, Alexander M, Fowler JH, Christakis NA. Assortative mating at loci under recent natural selection in humans. Biosystems 2020; 187:104040. [PMID: 31585150 PMCID: PMC7471337 DOI: 10.1016/j.biosystems.2019.104040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 09/23/2019] [Accepted: 09/24/2019] [Indexed: 11/25/2022]
Abstract
Genetic correlation between mates at specific loci can greatly alter the evolutionary trajectory of a species. Genetic assortative mating has been documented in humans, but its existence beyond population stratification (shared ancestry) has been a matter of controversy. Here, we develop a method to measure assortative mating across the genome at 1,044,854 single-nucleotide polymorphisms (SNPs), controlling for population stratification and cohort-specific cryptic relatedness. Using data on 1683 human couples from two data sources, we find evidence for both assortative and disassortative mating at specific, discernible loci throughout the entire genome. Then, using the composite of multiple signals (CMS) score, we also show that the group of SNPs exhibiting the most assortativity has been under stronger recent positive selection. Simulations using realistic inputs confirm that assortative mating might indeed affect changes in allele frequency over time. These results suggest that genetic assortative mating may be speeding up evolution in humans.
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Affiliation(s)
- Akihiro Nishi
- Department of Epidemiology, UCLA Fielding School of Public Health, Los Angeles, CA 90095, USA.
| | - Marcus Alexander
- Yale Institute for Network Science, Yale University, CT 06520, USA.
| | - James H Fowler
- Division of Medical Genetics and Department of Political Science, University of California, San Diego, La Jolla, CA, 92103, USA.
| | - Nicholas A Christakis
- Yale Institute for Network Science, Yale University, CT 06520, USA; Department of Sociology, Ecology and Evolutionary Biology, Medicine, Biomedical Engineering, and Statistics & Data Science, Yale University, New Haven, CT, USA.
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Marchi N, Mennecier P, Georges M, Lafosse S, Hegay T, Dorzhu C, Chichlo B, Ségurel L, Heyer E. Close inbreeding and low genetic diversity in Inner Asian human populations despite geographical exogamy. Sci Rep 2018; 8:9397. [PMID: 29925873 PMCID: PMC6010435 DOI: 10.1038/s41598-018-27047-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 04/13/2018] [Indexed: 01/12/2023] Open
Abstract
When closely related individuals mate, they produce inbred offspring, which often have lower fitness than outbred ones. Geographical exogamy, by favouring matings between distant individuals, is thought to be an inbreeding avoidance mechanism; however, no data has clearly tested this prediction. Here, we took advantage of the diversity of matrimonial systems in humans to explore the impact of geographical exogamy on genetic diversity and inbreeding. We collected ethno-demographic data for 1,344 individuals in 16 populations from two Inner Asian cultural groups with contrasting dispersal behaviours (Turko-Mongols and Indo-Iranians) and genotyped genome-wide single nucleotide polymorphisms in 503 individuals. We estimated the population exogamy rate and confirmed the expected dispersal differences: Turko-Mongols are geographically more exogamous than Indo-Iranians. Unexpectedly, across populations, exogamy patterns correlated neither with the proportion of inbred individuals nor with their genetic diversity. Even more surprisingly, among Turko-Mongols, descendants from exogamous couples were significantly more inbred than descendants from endogamous couples, except for large distances (>40 km). Overall, 37% of the descendants from exogamous couples were closely inbred. This suggests that in Inner Asia, geographical exogamy is neither efficient in increasing genetic diversity nor in avoiding inbreeding, which might be due to kinship endogamy despite the occurrence of dispersal.
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Affiliation(s)
- Nina Marchi
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France.
| | - Philippe Mennecier
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France
| | - Myriam Georges
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France.,LM2E-UMR6197, Laboratoire de Microbiologie des Environnements Extrêmes, Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, Plouzane, 29280, France
| | - Sophie Lafosse
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France
| | - Tatyana Hegay
- Republican Scientific Center of Immunology, Ministry of Public Health, Tashkent, 100060, Uzbekistan
| | - Choduraa Dorzhu
- Department of biology and ecology, Tuvan State University, Kyzyl, 667000, Russia
| | - Boris Chichlo
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France
| | - Laure Ségurel
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France
| | - Evelyne Heyer
- Eco-anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Univ Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, 75016, Paris, France.
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8
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Qiao Z, Powell JE, Evans DM. MHC-Dependent Mate Selection within 872 Spousal Pairs of European Ancestry from the Health and Retirement Study. Genes (Basel) 2018; 9:E53. [PMID: 29361785 PMCID: PMC5793204 DOI: 10.3390/genes9010053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/09/2018] [Accepted: 01/15/2018] [Indexed: 01/29/2023] Open
Abstract
Disassortative mating refers to the phenomenon in which individuals with dissimilar genotypes and/or phenotypes mate with one another more frequently than would be expected by chance. Although the existence of disassortative mating is well established in plant and animal species, the only documented example of negative assortment in humans involves dissimilarity at the major histocompatibility complex (MHC) locus. Previous studies investigating mating patterns at the MHC have been hampered by limited sample size and contradictory findings. Inspired by the sparse and conflicting evidence, we investigated the role that the MHC region played in human mate selection using genome-wide association data from 872 European American spouses from the Health and Retirement Study (HRS). First, we treated the MHC region as a whole, and investigated genomic similarity between spouses using three levels of genomic variation: single-nucleotide polymorphisms (SNPs), classical human leukocyte antigen (HLA) alleles (both four-digit and two-digit classifications), and amino acid polymorphisms. The extent of MHC dissimilarity between spouses was assessed using a permutation approach. Second, we investigated fine scale mating patterns by testing for deviations from random mating at individual SNPs, HLA genes, and amino acids in HLA molecules. Third, we assessed how extreme the spousal relatedness at the MHC region was compared to the rest of the genome, to distinguish the MHC-specific effects from genome-wide effects. We show that neither the MHC region, nor any single SNPs, classic HLA alleles, or amino acid polymorphisms within the MHC region, were significantly dissimilar between spouses relative to non-spouse pairs. However, dissimilarity in the MHC region was extreme relative to the rest of genome for both spousal and non-spouse pairs. Despite the long-standing controversy, our analyses did not support a significant role of MHC dissimilarity in human mate choice.
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Affiliation(s)
- Zhen Qiao
- University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland 4102, Australia.
| | - Joseph E Powell
- Institute for Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia.
| | - David M Evans
- University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland 4102, Australia.
- Medical Research Council (MRC) Integrative Epidemiology Unit, School of Social & Community Medicine, University of Bristol, Bristol BS8 1TH, UK.
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Winternitz J, Abbate JL, Huchard E, Havlíček J, Garamszegi LZ. Patterns of MHC-dependent mate selection in humans and nonhuman primates: a meta-analysis. Mol Ecol 2016; 26:668-688. [DOI: 10.1111/mec.13920] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 10/14/2016] [Accepted: 10/19/2016] [Indexed: 12/27/2022]
Affiliation(s)
- J. Winternitz
- Department of Evolutionary Ecology; Max Planck Institute for Evolutionary Biology; August-Thienemann-Strasse 2 24306 Ploen Germany
- Institute of Vertebrate Biology; Czech Academy of Sciences; v.v.i. Květná 8 603 65 Brno Czech Republic
- Institute of Botany; Czech Academy of Sciences; v.v.i. Lidická 25/27 657 20 Brno Czech Republic
| | - J. L. Abbate
- Institute of Ecology and Evolution; University of Bern; Balterstrasse 6 3006 Bern Switzerland
- INRA - UMR 1062 CBGP (INRA; IRD; CIRAD; Montpellier SupAgro); 755 Avenue du campus Agropolis 34988 Montferrier-sur-Lez France
| | - E. Huchard
- CEFE UMR5175; CNRS - Université de Montpellier - EPHE; 1919 Route de Mende 34295 Montpellier Cedex 5 France
| | - J. Havlíček
- Department of Zoology; Faculty of Science; Charles University; Viničná 7 128 44 Prague 2 Czech Republic
| | - L. Z. Garamszegi
- Department of Evolutionary Ecology; Estación Biológica de Doñana-CSIC; c/Americo Vespucio s/n 41092 Seville Spain
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Gazal S, Génin E, Leutenegger AL. Relationship inference from the genetic data on parents or offspring: A comparative study. Theor Popul Biol 2015; 107:31-8. [PMID: 26431644 DOI: 10.1016/j.tpb.2015.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 09/16/2015] [Accepted: 09/17/2015] [Indexed: 02/08/2023]
Abstract
Relationship inference in a population is of interest for many areas of research from anthropology to genetics. It is possible to directly infer the relationship between the two individuals in a couple from their genetic data or to indirectly infer it from the genetic data of one of their offspring. For this reason, one can wonder if it is more advantageous to sample couples or single individuals to study relationships of couples in a population. Indeed, sampling two individuals is more informative than sampling one as we are looking at four haplotypes instead of two, but it also doubles the cost of the study and is a more complex sampling scheme. To answer this question, we performed simulations of 1000 trios from 10 different relationships using real human haplotypes to have realistic genome-wide genetic data. Then, we compared the genome sharing coefficients and the relationship inference obtained from either a pair of individuals or one of their offspring using both single-point and multi-point approaches. We observed that for relationships closer than 1st cousin, pairs of individuals were more informative than one of their offspring for relationship inference, and kinship coefficients obtained from single-point methods gave more accurate or equivalent genome sharing estimations. For more remote relationships, offspring were more informative for relationship inference, and inbreeding coefficients obtained from multi-point methods gave more accurate genome sharing estimations. In conclusion, relationship inference on a parental pair or on one of their offspring provides complementary information. When possible, sampling trios should be encouraged as it could allow spanning a wider range of potential relationships.
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Affiliation(s)
- Steven Gazal
- Inserm, UMR 1137, IAME, Paris, France; Université Paris Diderot, Sorbonne Paris Cité, UMR 1137, Paris, France; Plateforme de Génétique constitutionnelle-Nord (PfGC-Nord), Paris, France
| | - Emmanuelle Génin
- Inserm, UMR 1078, Brest, France; Université Bretagne Occidentale, Brest, France; Centre Hospitalier Régional Universitaire, Brest, France
| | - Anne-Louise Leutenegger
- Inserm, U946, Genetic Variation and Human Diseases Lab, Paris, France; Université Paris Diderot, Sorbonne Paris Cité, Institut Universitaire d'Hématologie, UMR 946, Paris, France.
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Abstract
Qualitative-consciousness arises at the sensory level of olfactory processing and pervades our experience of smells to the extent that qualitative character is maintained whenever we are aware of undergoing an olfactory experience. Building upon the distinction between Access and Phenomenal Consciousness the paper offers a nuanced distinction between Awareness and Qualitative-consciousness that is applicable to olfaction in a manner that is conceptual precise and empirically viable. Mounting empirical research is offered substantiating the applicability of the distinction to olfaction and showing that olfactory qualitative-consciousness can occur without awareness, but any olfactory state that we are aware of being in is always qualitative. Evidence that olfactory sensory states have a qualitatively character in the absence of awareness derives from research on mate selection, the selection of social preference for social interaction and acquaintances, as well as the role of olfactory deficits in causing affective disorders. Furthermore, the conservation of secondary processing measures of olfactory valence during olfactory imagery experiments provides verification that olfactory awareness is always qualitatively conscious-all olfactory consciousness smells phenomenal.
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Affiliation(s)
- Benjamin D Young
- Department of Cognitive and Brain Science, Ben-Gurion University of the Negev Beer-Sheva, Israel
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Israeli M, Kristt D, Nardi Y, Klein T. Genetic considerations in human sex-mate selection: partners share human leukocyte antigen but not short-tandem-repeat identity markers. Am J Reprod Immunol 2014; 71:467-71. [PMID: 24589062 DOI: 10.1111/aji.12213] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 01/13/2014] [Indexed: 11/26/2022] Open
Abstract
PROBLEM Previous studies support a role for MHC on mating preference, yet it remains unsettled as to whether mating occurs preferentially between individuals sharing human leukocyte antigen (HLA) determinants or not. Investigating sex-mate preferences in the contemporary Israeli population is of further curiosity being a population with distinct genetic characteristics, where multifaceted cultural considerations influence mate selection. METHOD OF STUDY Pairs of male-female sex partners were evaluated in three groups. Two groups represented unmarried (n = 1002) or married (n = 308) couples and a control group of fictitious male-female couples. HLA and short-tandem-repeat (STR) genetic identification markers were assessed for the frequency of shared antigens and alleles. RESULTS Human leukocyte antigen results showed that Class I and/ or Class II single antigen as well as double antigen sharing was more common in sex partners than in control group couples (P < 0.001). Married versus unmarried pairs were not distinguishable. In contrast, STR-DNA markers failed to differentiate between sex-mates and controls (P = 0.78). CONCLUSION Sex partnerships shared HLA determinants more frequently than randomly constituted male-female pairs. The observed phenomenon does not reflect a syngenetic background between sex-mates as STR markers were not selectively shared. Thus, sex-mate selection in man may contravene the evolutionary pressure for genetic diversity in regard to HLA.
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Affiliation(s)
- Moshe Israeli
- Tissue Typing Laboratory, Rabin Medical Center, Petach-Tikva, Israel
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Overath P, Sturm T, Rammensee HG. Of volatiles and peptides: in search for MHC-dependent olfactory signals in social communication. Cell Mol Life Sci 2014; 71:2429-42. [PMID: 24496643 PMCID: PMC4055862 DOI: 10.1007/s00018-014-1559-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 01/06/2014] [Indexed: 01/11/2023]
Abstract
Genes of the major histocompatibility complex (MHC), which play a critical role in immune recognition, are considered to influence social behaviors in mice, fish, humans, and other vertebrates via olfactory cues. As studied most extensively in mice, the polymorphism of MHC class I genes is considered to bring about a specific scent signature, which is decoded by the olfactory system resulting in an individual-specific reaction such as mating. On the assumption that this signature resides in volatiles, extensive attempts to identify these MHC-specific components in urine failed. Alternatively, it has been suggested that peptide ligands of MHC class I molecules are released into urine and can elicit an MHC-haplotype-specific behavioral response after uptake into the nose by sniffing. Analysis of the urinary peptide composition of mice shows that MHC-derived peptides are present, albeit in extremely low concentrations. In contrast, urine contains abundant peptides which differ between mouse strains due to genomic variations such as single-nucleotide variations or complex polymorphisms in multigene families as well as in their concentration. Thus, urinary peptides represent a real-time sampling of the expressed genome available for sensory evaluation. It is suggested that peptide variation caused by genomic differences contains sufficient information for individual recognition beyond or instead of an influence of the MHC in mice and other vertebrates.
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Affiliation(s)
- Peter Overath
- Interfakultäres Institut für Zellbiologie, Abteilung Immunologie, Universität Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany,
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Abstract
Natural selection defined by differential survival and reproduction of individuals in populations is influenced by genetic, developmental, and environmental factors operating at every age and stage in human life history: generation of gametes, conception, birth, maturation, reproduction, senescence, and death. Biological systems are built upon a hierarchical organization nesting subcellular organelles, cells, tissues, and organs within individuals, individuals within families, and families within populations, and the latter among other populations. Natural selection often acts simultaneously at more than one level of biological organization and on specific traits, which we define as multilevel selection. Under this model, the individual is a fundamental unit of biological organization and also of selection, imbedded in a larger evolutionary context, just as it is a unit of medical intervention imbedded in larger biological, cultural, and environmental contexts. Here, we view human health and life span as necessary consequences of natural selection, operating at all levels and phases of biological hierarchy in human life history as well as in sociological and environmental milieu. An understanding of the spectrum of opportunities for natural selection will help us develop novel approaches to improving healthy life span through specific and global interventions that simultaneously focus on multiple levels of biological organization. Indeed, many opportunities exist to apply multilevel selection models employed in evolutionary biology and biodemography to improving human health at all hierarchical levels. Multilevel selection perspective provides a rational theoretical foundation for a synthesis of medicine and evolution that could lead to discovering effective predictive, preventive, palliative, potentially curative, and individualized approaches in medicine and in global health programs.
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The Major Histocompatibility Complex and Primate Behavioral Ecology: New Tools and Future Questions. INT J PRIMATOL 2013. [DOI: 10.1007/s10764-013-9700-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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16
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Huchard E, Baniel A, Schliehe-Diecks S, Kappeler PM. MHC-disassortative mate choice and inbreeding avoidance in a solitary primate. Mol Ecol 2013; 22:4071-86. [DOI: 10.1111/mec.12349] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 04/03/2013] [Accepted: 04/09/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Elise Huchard
- Behavioral Ecology and Sociobiology Unit; German Primate Center; Kellnerweg 4 Göttingen Germany
- Courant Research Centre Evolution of Social Behaviour; University of Göttingen; Kellnerweg 6 Göttingen Germany
| | - Alice Baniel
- Behavioral Ecology and Sociobiology Unit; German Primate Center; Kellnerweg 4 Göttingen Germany
| | - Susanne Schliehe-Diecks
- Behavioral Ecology and Sociobiology Unit; German Primate Center; Kellnerweg 4 Göttingen Germany
- Courant Research Centre Evolution of Social Behaviour; University of Göttingen; Kellnerweg 6 Göttingen Germany
| | - Peter M. Kappeler
- Behavioral Ecology and Sociobiology Unit; German Primate Center; Kellnerweg 4 Göttingen Germany
- Courant Research Centre Evolution of Social Behaviour; University of Göttingen; Kellnerweg 6 Göttingen Germany
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Laurent R, Chaix R. HapMap European American genotypes are compatible with the hypothesis of MHC-dependent mate choice (response to DOI 10.1002/bies.201200023, Derti and Roth). Bioessays 2012; 34:871-2. [PMID: 22777848 DOI: 10.1002/bies.201200075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Romain Laurent
- Eco-Anthropologie et Ethnobiologie, UMR 7206 CNRS, MNHN, Université Paris Diderot, Sorbonne Paris Cité, Paris, France
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Derti A, Roth FP. Response to "MHC-dependent mate choice in humans: Why genomic patterns from the HapMap European American data set support the hypothesis". HapMap genotypes do not confidently support a role for the MHC locus in human mate selection. Bioessays 2012; 34:576-7. [PMID: 22467222 DOI: 10.1002/bies.201200023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Adnan Derti
- Novartis Institutes for BioMedical Research, Cambridge, MA, USA
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