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Fernandes EDS, Ferreira IF, de Felipe RP, Segal N, Otta E. Brazilian Twin Studies: A Scoping Review. Twin Res Hum Genet 2024; 27:105-114. [PMID: 38619001 DOI: 10.1017/thg.2024.17] [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: 04/16/2024]
Abstract
The current study was motivated by an interest in deepening understanding of Brazilian twin research, which is underrepresented internationally, in an effort to rectify this situation. Our aim was threefold: (1) to carry out a comprehensive investigation of Brazilian research on twins according to the area of knowledge; (2) to evaluate the representation of research in the field of psychology in comparison with other areas; (3) to evaluate characteristics of the research that may have contributed to its exclusion from the comprehensive meta-analysis of 50 years of twin research. A scoping review was performed according to PRISMA guidelines. Titles and abstracts were searched up to 2022 in six databases: CAPES, BDLTD, PePSIC, PubMed, Google Scholar, and SciELO, using selected keywords both in Portuguese and in English (e.g., 'twins' and 'Brazil'; 'twinning' and 'Brazil'; 'gemelaridade' [twinning], and 'gêmeos' [twins]). Three hundred and forty publications were included in the review. Approximately half (53.8‰) used the classic twin design to investigate the heritability of several traits, and the other half (46.2%) used other research designs. The scoping review showed that the number of publications doubled approximately every 10 years. Most publications were from the health area, with medicine accounting for approximately half of the studies, followed by psychology, odontology, and biology. We found that the interest in studying twins among Brazilian scientists is increasing over the years and there are reasons to be enthusiastic about the potential impact of this trend in the global scenario.
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Affiliation(s)
- Eloisa de Souza Fernandes
- Departamento de Psicologia Experimental, Instituto de Psicologia (IP), Universidade de São Paulo (USP), Brazil
| | - Isabella França Ferreira
- Departamento de Psicologia Experimental, Instituto de Psicologia (IP), Universidade de São Paulo (USP), Brazil
| | - Renata Pereira de Felipe
- Departamento de Psicologia Experimental, Instituto de Psicologia (IP), Universidade de São Paulo (USP), Brazil
| | - Nancy Segal
- Department of Psychology, California State University, Fullerton, California, USA
| | - Emma Otta
- Departamento de Psicologia Experimental, Instituto de Psicologia (IP), Universidade de São Paulo (USP), Brazil
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İlisulu SC, Birant S, Kasimoglu Y, Koruyucu M, Tuna İnce EB, Seymen F. Clinical assessment of deleterious oral habits and dental caries-periodontal parameters among Turkish twins. J Dent Sci 2023; 18:1859-1866. [PMID: 37799885 PMCID: PMC10547993 DOI: 10.1016/j.jds.2023.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/07/2023] [Indexed: 10/07/2023] Open
Abstract
Abstract Background/purpose Twin studies are crucial to assess the relative contribution of genetic and environmental factors. This study was conducted to evaluate association between deleterious oral habits and dental caries-periodontal parameters among Turkish twins. Materials and methods The study comprised 143 pairs of dizygotic (DZ) twins and 59 pairs of monozygotic (MZ) twins aged 3-15 years. Twins were examined for dental caries, plaque index, gingival index, bleeding on probing and deleterious oral habits. Mann Whitney U test was used to examine the data. Results The MZ twin pairs consisted of 60 male and 58 female twin pairs, whereas the DZ twin pairs consisted of 144 male and 142 female. The mean age of the twins was 9.63 ± 3.0 in MZ twins and 9.47 ± 3.2 in DZ twins. The mean DMFS value of MZ twins with bruxism is higher than those of MZ twins without bruxism (P = 0.001). The mean DMFS value of DZ twins with pacifier sucking is lower than those without (P = 0.007). A statistically significant difference was found between MZ twins with and without nail biting in terms of bleeding on probing and dmfs values (P = 0.035; P = 0.012). The mean values of the plaque index increased due to the mouth breathing in DZ twins (P = 0.024). Regarding the bleeding on probing, there was a statistically significant difference between MZ twins with and without atypical swallowing (P = 0.016). Conclusion These findings suggest that dental caries-periodontal parameters are similarly affected by deleterious oral habits in MZ and DZ twins.
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Affiliation(s)
- Sabiha Ceren İlisulu
- Altınbaş University, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
| | - Sinem Birant
- Istanbul University-Cerrahpaşa, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
| | - Yelda Kasimoglu
- Istanbul University, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
| | - Mine Koruyucu
- Istanbul University, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
| | - Elif Bahar Tuna İnce
- Istanbul University, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
| | - Figen Seymen
- Altınbaş University, Faculty of Dentistry, Department of Pedodontics, Istanbul, Turkey
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A Computer-Based Tool for the Assessment of Voice Quality Through Visual Analogue Scales: VAS-Simplified Vocal Profile Analysis. J Voice 2019; 35:497.e9-497.e21. [PMID: 31727412 DOI: 10.1016/j.jvoice.2019.10.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 10/10/2019] [Accepted: 10/11/2019] [Indexed: 01/22/2023]
Abstract
In this study we propose a new tool for the perceptual assessment of voice quality. For its design, we have adapted the Simplified Vocal Profile Analysis so that the new tool features two main characteristics: (1) the ordinal scalar degrees of the original protocol are turned into a visual analog scale; and (2) the original paper-based version of the protocol is now a computer-based implementation. In order to assess the reliability of the new tool, five phoneticians listened to 12 different speakers and evaluated their voice quality using the proposed tool. Inter-rater agreement was then calculated using the Intraclass Correlation Coefficient. The results show that high agreement was reached for most of the perceptual settings of the protocol. Yet more investigations seem necessary into the continuous nature of the perceptual dimensions making up the voice quality of a speaker. As a preliminary approach to the graphical possibilities that the visual analog scale offers to the Simplified Vocal Profile Analysis, we explore the usefulness of multiple dot plots and propose an adaptation of the Bland-Altman plot to be used in pairwise comparisons. In this study, these visualization techniques are tested on two pairs of identical twins.
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Waszak M, Cieślik K, Skrzypczak-Zielińska M, Szalata M, Wielgus K, Kempiak J, Bręborowicz G, Słomski R. Ecosensitivity and genetic polymorphism of somatic traits in the perinatal development of twins. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2015; 67:138-49. [PMID: 26619791 DOI: 10.1016/j.jchb.2015.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 07/26/2015] [Indexed: 11/27/2022]
Abstract
In view of criticism regarding the usefulness of heritability coefficients, the aim of this study was to analyze separately the information on genetic and environmental variability. Such an approach, based on the normalization of trait's variability for its value, is determined by the coefficients of genetic polymorphism (Pg) and ecosensitivity (De). The studied material included 1263 twin pairs of both sexes (among them 424 pairs of monozygotic twins and 839 pairs of dizygotic twins) born between the 22nd and 41st week of gestation. Variability of six somatic traits was analyzed. The zygosity of same-sex twins was determined based on the polymorphism of DNA from lymphocytes of the umbilical cord blood, obtained at birth. The coefficients of genetic polymorphism and ecosensitivity for analyzed traits of male and female twins born at various months of gestation were calculated. Our study revealed that a contribution of the genetic component predominated over that of the environmental component in determining the phenotypic variability of somatic traits of newborns from twin pregnancies. The genetically determined phenotypic variability in male twins was greater than in the females. The genetic polymorphism and ecosensitivity of somatic traits were relatively stable during the period of fetal ontogeny analyzed in this study. Only in the case of body weight, a slight increase in the genetic contribution of polygenes to the phenotypic variance could be observed with gestational age, along with a slight decrease in the influence of environmental factors.
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Affiliation(s)
- Małgorzata Waszak
- Department of Functional Anatomy, University School of Physical Education in Poznań, Królowej Jadwigi 27/39, 61-871 Poznań, Poland.
| | - Krystyna Cieślik
- Department of Functional Anatomy, University School of Physical Education in Poznań, Królowej Jadwigi 27/39, 61-871 Poznań, Poland
| | | | - Marlena Szalata
- Institute of Human Genetics, Polish Academy of Sciences, Strzeszyńska 32, 60-479 Poznań, Poland
| | - Karolina Wielgus
- Department of Biotechnology and Molecular Biology, Institute of Natural Fibres and Medicinal Plants, Wojska Polskiego 71b, 60-630 Poznań, Poland
| | - Joanna Kempiak
- Department of Perinatology and Gynaecology in Poznan, University of Medical Sciences, Polna 33, 60-535 Poznań, Poland
| | - Grzegorz Bręborowicz
- Department of Perinatology and Gynaecology in Poznan, University of Medical Sciences, Polna 33, 60-535 Poznań, Poland
| | - Ryszard Słomski
- Institute of Human Genetics, Polish Academy of Sciences, Strzeszyńska 32, 60-479 Poznań, Poland
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Mazher W. A Foucaultian critique of learning disability discourses: personal narratives and science. INTERNATIONAL JOURNAL OF QUALITATIVE STUDIES IN EDUCATION 2012. [DOI: 10.1080/09518398.2011.569767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
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Deryakulu D, Calışkan E. A twin study of computer anxiety in Turkish adolescents. CYBERPSYCHOLOGY BEHAVIOR AND SOCIAL NETWORKING 2012; 15:212-8. [PMID: 22394420 DOI: 10.1089/cyber.2011.0499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The present study investigated computer anxiety within a sample of Turkish twins aged 10-18. A total of 185 twin-pairs participated in the study. Of the twins, 64 pairs (34.6 percent) were monozygotic (MZ) and 121 pairs (65.4 percent) were dizygotic (DZ). Of the 121 DZ twins, 54 pairs (44.63 percent) were same-sex twins and 67 pairs (55.37 percent) were opposite-sex twins. Computer anxiety was assessed using Computer Anxiety Rating Scale-Turkish Version (CARS-TV), one of the three main scales of "Measuring Technophobia Instruments" developed by Rosen and Weil. The results of paired t test comparisons showed no significant differences in MZ and same-sex DZ twin-pairs' levels of computer anxiety. On the other hand, a significant difference was found in opposite-sex DZ twin-pairs' level of computer anxiety. Interesting enough, males appeared to be more computer anxious than their female co-twins. In the present study, using Falconer's formula, heritability estimate for computer anxiety was derived from correlations based on MZ and DZ twins' mean scores on CARS-TV. The results showed that 57 percent of the variance in computer anxiety was from genetics and 41.5 percent was from nonshared environmental factors. Shared environmental influence, on the other hand, was very small and negligible. Interpretations of results and potential directions for future research are presented.
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Affiliation(s)
- Deniz Deryakulu
- Department of Computer and Instructional Technologies Education, Ankara University, Ankara, Turkey.
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Mellins CA, Gatz M, Baker L. Children's methods of coping with stress: a twin study of genetic and environmental influences. J Child Psychol Psychiatry 1996; 37:721-30. [PMID: 8894953 DOI: 10.1111/j.1469-7610.1996.tb01464.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The relative importance of environmental and hereditary factors in how children cope with stress was examined. Emotion-focused, problem-focused, and additional coping variables were assessed in 44 monozygotic (MZ) and 30 dizygotic (DZ) twin pairs, aged 9-16 years. The effects of heritability, shared environment, and unshared environment were examined in structural modelling analyses. Genetic factors accounted for a majority of the reliable variance in four of seven coping variables, while effects of twins' shared environment were negligible for all but one coping variable. Environmental factors important to individual differences in coping strategies were primarily unique to each child (unshared between the twins), highlighting the importance of individual experiences in shaping coping behaviors.
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Affiliation(s)
- C A Mellins
- HIV Center for Clinical and Behavioral Studies, New York State Psychiatric Institute, Columbia University, USA
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Whitfield KE. The use of quantitative genetic methodology to gain insights into the origins of individual differences in later life. Exp Aging Res 1994; 20:135-43. [PMID: 8020540 DOI: 10.1080/03610739408253959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
There is great interest in the interindividual variability in aged populations. Knowledge of the etiology of these individual differences may lead to a more comprehensive understanding of aging. The purpose of this article is to discuss the use of quantitative genetic (or behavioral genetic) methodology to identify sources of individual variation in later life. These methods can provide insights into the proportion of environmental and genetic influences on behavior. Some of the basic procedures used in quantitative genetic analyses and their rationales are provided. In addition, the use of structural equation modeling to model genetic and environmental effects is discussed. Lastly, some of the special issues involved in quantitative genetic research on aged populations are discussed.
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Segal NL, Russell JM. Twins in the Classroom: School Policy issues and Recommendations. JOURNAL OF EDUCATIONAL AND PSYCHOLOGICAL CONSULTATION 1992. [DOI: 10.1207/s1532768xjepc0301_5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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