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Gardner M, Khorashad BS, Lee PA, Kogan BA, Sandberg DE. Recommendations for 46,XX Congenital Adrenal Hyperplasia Across Two Decades: Insights from the North American Differences of Sex Development Clinician Survey. ARCHIVES OF SEXUAL BEHAVIOR 2024; 53:1695-1711. [PMID: 38684620 PMCID: PMC11106198 DOI: 10.1007/s10508-024-02853-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 03/07/2024] [Accepted: 03/08/2024] [Indexed: 05/02/2024]
Abstract
Several aspects of clinical management of 46,XX congenital adrenal hyperplasia (CAH) remain unsettled and controversial. The North American Disorders/Differences of Sex Development (DSD) Clinician Survey investigated changes, over the last two decades, in clinical recommendations by specialists involved in the management of newborns with DSD. Members of the (Lawson Wilkins) Pediatric Endocrine Society and the Societies for Pediatric Urology participated in a web-based survey at three timepoints: 2003-2004 (T1, n = 432), 2010-2011 (T2, n = 441), and 2020 (T3, n = 272). Participants were presented with two clinical case scenarios-newborns with 46,XX CAH and either mild-to-moderate or severe genital masculinization-and asked for clinical recommendations. Across timepoints, most participants recommended rearing the newborn as a girl, that parents (in consultation with physicians) should make surgical decisions, performing early genitoplasty, and disclosing surgical history at younger ages. Several trends were identified: a small, but significant shift toward recommending a gender other than girl; recommending that adolescent patients serve as the genital surgery decision maker; performing genital surgery at later ages; and disclosing surgical details at younger ages. This is the first study assessing physician recommendations across two decades. Despite variability in the recommendations, most experts followed CAH clinical practice guidelines. The observation that some of the emerging trends do not align with expert opinion or empirical evidence should serve as both a cautionary note and a call for prospective studies examining patient outcomes associated with these changes.
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Affiliation(s)
- Melissa Gardner
- Department of Pediatrics, Susan B. Meister Child Health Evaluation and Research Center, University of Michigan Medical School, 2800 Plymouth Road, North Campus Research Complex, Building 16/G035E, Ann Arbor, MI, 48109, USA
| | - Behzad Sorouri Khorashad
- Department of Pediatrics, Susan B. Meister Child Health Evaluation and Research Center, University of Michigan Medical School, 2800 Plymouth Road, North Campus Research Complex, Building 16/G035E, Ann Arbor, MI, 48109, USA
| | - Peter A Lee
- Department of Pediatrics, Penn State Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA
| | - Barry A Kogan
- Department of Urology, Albany Medical College and Center, Albany, NY, USA
| | - David E Sandberg
- Department of Pediatrics, Susan B. Meister Child Health Evaluation and Research Center, University of Michigan Medical School, 2800 Plymouth Road, North Campus Research Complex, Building 16/G035E, Ann Arbor, MI, 48109, USA.
- Division of Pediatric Psychology, Department of Pediatrics, University of Michigan Medical School, Ann Arbor, MI, USA.
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2
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Kung KTF, Louie K, Spencer D, Hines M. Prenatal androgen exposure and sex-typical play behaviour: A meta-analysis of classic congenital adrenal hyperplasia studies. Neurosci Biobehav Rev 2024; 159:105616. [PMID: 38447820 DOI: 10.1016/j.neubiorev.2024.105616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/08/2024]
Abstract
Thousands of non-human mammal experiments have demonstrated that early androgen exposure exerts long-lasting effects on neurobehavioural sexual differentiation. In humans, females with classic congenital adrenal hyperplasia (CAH) are exposed to unusually high concentrations of androgens prenatally, whereas prenatal concentrations of androgens in males with CAH are largely normal. The current meta-analysis included 20 independent samples and employed multi-level meta-analytic models. Consistently across all 7 male-typical and female-typical play outcomes, in the expected directions, the present study found significant and large average differences between control males and control females (gs = 0.83-2.78) as well as between females with CAH and control females (gs = 0.95-1.08), but differences between males with CAH and control males were mostly negligible and were non-significant for 6 of the 7 outcomes (gs = 0.04-0.27). These meta-analytic findings suggest that prenatal androgen exposure masculinises and defeminises play behaviour in humans. Broader implications in relation to sex chromosomes, brain development, oestrogens, socio-cognitive influences, other aspects of sex-related behavioural development, and gender nonconformity are discussed.
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Affiliation(s)
- Karson T F Kung
- Department of Psychology, Jockey Club Tower, Centennial Campus, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region.
| | - Krisya Louie
- Department of Psychology, Jockey Club Tower, Centennial Campus, University of Hong Kong, Pokfulam, Hong Kong Special Administrative Region
| | - Debra Spencer
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom
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3
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Lafta MS, Mwinyi J, Affatato O, Rukh G, Dang J, Andersson G, Schiöth HB. Exploring sex differences: insights into gene expression, neuroanatomy, neurochemistry, cognition, and pathology. Front Neurosci 2024; 18:1340108. [PMID: 38449735 PMCID: PMC10915038 DOI: 10.3389/fnins.2024.1340108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 02/09/2024] [Indexed: 03/08/2024] Open
Abstract
Increased knowledge about sex differences is important for development of individualized treatments against many diseases as well as understanding behavioral and pathological differences. This review summarizes sex chromosome effects on gene expression, epigenetics, and hormones in relation to the brain. We explore neuroanatomy, neurochemistry, cognition, and brain pathology aiming to explain the current state of the art. While some domains exhibit strong differences, others reveal subtle differences whose overall significance warrants clarification. We hope that the current review increases awareness and serves as a basis for the planning of future studies that consider both sexes equally regarding similarities and differences.
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Affiliation(s)
- Muataz S. Lafta
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
| | - Jessica Mwinyi
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
- Centre for Women’s Mental Health, Uppsala University, Uppsala, Sweden
| | - Oreste Affatato
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
- Centre for Women’s Mental Health, Uppsala University, Uppsala, Sweden
| | - Gull Rukh
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
| | - Junhua Dang
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
| | - Gerhard Andersson
- Department of Behavioural Sciences and Learning, Linköping University, Linköping, Sweden
- Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Helgi B. Schiöth
- Department of Surgical Sciences, Functional Pharmacology and Neuroscience, Uppsala University, Uppsala, Sweden
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4
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Vedor JE. Revisiting Carl Jung's archetype theory a psychobiological approach. Biosystems 2023; 234:105059. [PMID: 37832929 DOI: 10.1016/j.biosystems.2023.105059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/09/2023] [Accepted: 10/10/2023] [Indexed: 10/15/2023]
Abstract
This paper delves into the concept of archetypes, universal patterns of behavior and cognition, and proposes a novel tripartite model distinguishing between structural, regulatory, and representational archetypes. Drawing on insights from code biology, neuroscience, genetics, and epigenetics, the model provides a nuanced framework for understanding archetypes and their role in shaping cognition and behavior. The paper also explores the interplay between these elements to express representational archetypes. Furthermore, it addresses the informational capacity of the genome and its influence on post-natal development and the psyche. The paper concludes by discussing the future trajectory of psychology, emphasizing the need for an integrative approach that combines our understanding of social constructs with insights into our inherent organizational propensities or archetypes. This exploration holds the potential to advance our understanding of the human condition.
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5
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Balthazart J, Roselli CE. Hormonal, Genetic, Immunological: An Array of Mechanisms but How Do They Interact, If at All? ARCHIVES OF SEXUAL BEHAVIOR 2023; 52:2963-2971. [PMID: 36376746 DOI: 10.1007/s10508-022-02469-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 10/28/2022] [Accepted: 10/30/2022] [Indexed: 05/20/2023]
Affiliation(s)
| | - Charles E Roselli
- Department of Chemical, Physiology & Biochemistry, Oregon Health & Science University, Portland, OR, USA
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6
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Sethuram S, Raymond S, Wang C, Barrett ES, Bush NR, Nguyen R, Sathyanarayana S, Swan SH, Evans SF. Early prenatal sex steroids and sex-typed play behavior at 4 years of age. Psychoneuroendocrinology 2023; 156:106288. [PMID: 37480735 DOI: 10.1016/j.psyneuen.2023.106288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 03/27/2023] [Accepted: 05/02/2023] [Indexed: 07/24/2023]
Abstract
During pregnancy, estrogens and testosterone influence brain development, resulting in sex-typical behavioral phenotypes. Prenatal testosterone exposure is associated with more male-typical behaviors in rodents, monkeys, and humans; however, few studies have examined the relationship between maternal sex hormones within the normal range and sex-dimorphic behaviors. In this study, we examined associations between prenatal estrogens and testosterone and sex-typical play in The Infant Development and the Environment Study (TIDES), a multicenter pregnancy cohort. We collected prenatal serum during the first trimester (mean=11.1 ± 2.6 weeks) and assessed child play behavior using the maternally completed Pre-School Activities Inventory (PSAI) at a mean age of 4.5 ± 0.3 years. This analysis includes mother-child pairs with complete data on hormones, play behavior, and covariates (n = 192 boys and 207 girls). No associations were seen between testosterone and PSAI scores in boys or girls or between estrogens and PSAI scores in boys. In girls, we observed an inverse relationship between feminine PSAI scores and both estradiol (E2) and estriol (E3) in multivariable linear regression analyses (E2: -0.11 [95% CI -0.20, -0.02]; E3: -0.44 [95% CI -0.83,-0.04]). Because the relationship between sex hormones and PSAI scores appeared nonlinear, we fit piecewise regression models to better fit the data and identify inflection points (point at which there is a significant change in slope). Piecewise regression analyses yielded inverse associations between masculine PSAI scores and estrone (E1) at values of E1 > 1340 pg/mL and E2 at values of E2 > 2870 pg/mL in girls. Further studies are needed to better understand the role of prenatal sex steroids on sexually dimorphic behavior.
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Affiliation(s)
- Swathi Sethuram
- Department of Pediatric Endocrinology, Massachusetts General Hospital, Boston, MA, USA.
| | - Samantha Raymond
- Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Christina Wang
- Clinical and Translational Science Institute, The Lundquist Institute and Harbor-UCLA Medical Center, Torrance, CA, USA
| | - Emily S Barrett
- Department of Biostatistics and Epidemiology, Rutgers School of Public Health, Piscataway, NJ, USA
| | - Nicole R Bush
- Departments of Psychiatry and Pediatrics, Center for Health and Community, University of California, San Francisco, CA, USA
| | - Ruby Nguyen
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, USA
| | - Sheela Sathyanarayana
- Department of Pediatrics, University of Washington, Seattle, WA, USA; Seattle Children's Research Institute, Seattle, WA, USA
| | - Shanna H Swan
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sarah Felice Evans
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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7
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Cross CP, Boothroyd LG, Jefferson CA. Agent-based models of the cultural evolution of occupational gender roles. ROYAL SOCIETY OPEN SCIENCE 2023; 10:221346. [PMID: 37388313 PMCID: PMC10300665 DOI: 10.1098/rsos.221346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 06/01/2023] [Indexed: 07/01/2023]
Abstract
The causes of sex differences in human behaviour are contested, with 'evolutionary' and 'social' explanations often being pitted against each other in the literature. Recent work showing positive correlations between indices of gender equality and the size of sex differences in behaviour has been argued to show support for 'evolutionary' over 'social' approaches. This argument, however, neglects the potential for social learning to generate arbitrary gender segregation. In the current paper we simulate, using agent-based models, a population where agents exist as one of two 'types' and can use social information about which types of agents are performing which 'roles' within their environment. We find that agents self-segregate into different roles even where real differences in performance do not exist, if there is a common belief (modelled as priors) that group differences may exist in 'innate' competence. Facilitating role changes such that agents should move without cost to the predicted highest-rewards for their skills (i.e. fluidity of the labour market) reduced segregation, while forcing extended exploration of different roles eradicated gender segregation. These models are interpreted in terms of bio-cultural evolution, and the impact of social learning on the expression of gender roles.
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Affiliation(s)
- C P Cross
- School of Psychology & Neuroscience, University of St Andrews, St Mary's College, St Andrew, Fife KY16 9AZ, UK
| | - L G Boothroyd
- Department of Psychology, Durham University, South Road, Durham DH1 3LE, UK
| | - C A Jefferson
- School of Computer Science, University of St Andrews, Jack Cole Building, North Haugh, St Andrews, Fife KY16 9SX, UK
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8
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Neufeld SAS, Collaer ML, Spencer D, Pasterski V, Hindmarsh PC, Hughes IA, Acerini C, Hines M. Androgens and child behavior: Color and toy preferences in children with congenital adrenal hyperplasia (CAH). Horm Behav 2023; 149:105310. [PMID: 36738514 PMCID: PMC9976950 DOI: 10.1016/j.yhbeh.2023.105310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 12/30/2022] [Accepted: 01/03/2023] [Indexed: 02/05/2023]
Abstract
Human males and females show average gender/sex differences for certain psychological phenomena. Multiple factors may contribute to these differences, including sex chromosomes, exposure to gonadal hormones, and socialization or learning. This study investigated potential hormonal and socialization/learning influences on gender/sex differences in childhood preferences for color, specifically pink and red vs. blues, and for toys. Children (aged 4 to 11 years) with congenital adrenal hyperplasia (CAH, n = 43 girls and 37 boys), marked by elevated prenatal adrenal androgen exposure, and without CAH (n = 41 girls and 31 boys) were studied. Prior research indicates girls with CAH are masculinized for certain behaviors, such as toy choices, while boys with CAH generally do not differ from boys without CAH. In the current study, children indicated preferences for stereotyped hues of pink vs. blue as well as two control color pairs. They also indicated their preference between gender/sex-typed toys (doll vs. car) presented in black and white, in gender/sex-congruent colors (pink doll vs. blue car) and in gender/sex-incongruent colors (pink car vs. blue doll). Color findings: Control girls preferred stereotyped pink over blue more than boys or girls with CAH did; the latter two groups did not differ in their color preferences. No preference differences occurred for other color pairs. Toy findings: In black/white or gender/sex-congruent colors, boys preferred the car more than control girls or girls with CAH did, while girls with CAH preferred the car more than control girls did. In gender/sex-incongruent colors (pink car vs. blue doll), boys still preferred the car, while girls with CAH showed reduced and control girls showed increased preferences for the pink car compared to the car preferences in black/white. Results support learning theories of color preferences, perhaps also influenced by pre-existing toy preferences which may occur for other reasons, including early androgen exposure. Specifically, girls with CAH may have learned they do not enjoy stereotypical toys for girls, often colored pink, and pink coloring may subsequently diminish their preference for a car. Our results highlight the importance of gonadal hormones and learning in the development of childhood toy and color preferences.
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Affiliation(s)
- Sharon A S Neufeld
- Department of Psychology, University of Cambridge, Downing Place, Cambridge CB2 3EB, UK.
| | - Marcia L Collaer
- Department of Psychology and Neuroscience Program, Middlebury College, Middlebury, VT 05753, USA.
| | - Debra Spencer
- Department of Psychology, University of Cambridge, Downing Place, Cambridge CB2 3EB, UK.
| | - Vickie Pasterski
- Department of Psychology, University of Cambridge, Downing Place, Cambridge CB2 3EB, UK; Department of Paediatrics, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK.
| | - Peter C Hindmarsh
- Developmental Endocrinology Research Group, Institute of Child Health, University College London, London, UK.
| | - Ieuan A Hughes
- Department of Paediatrics, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK.
| | - Carlo Acerini
- Department of Paediatrics, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Downing Place, Cambridge CB2 3EB, UK.
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9
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Ivan S, Daniela O, Jaroslava BD. Sex differences matter: Males and females are equal but not the same. Physiol Behav 2023; 259:114038. [PMID: 36423797 DOI: 10.1016/j.physbeh.2022.114038] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 11/18/2022] [Accepted: 11/19/2022] [Indexed: 11/23/2022]
Abstract
Sex differences between males and females can be detected early in life. They are present also later even to a much greater extent affecting our life in adulthood and a wide spectrum of physical, psychological, cognitive, and behavioral characteristics. Moreover, sex differences matter also in individual's health and disease. In this article, we reviewed at first the sex differences in brain organization and function with respect to the underlying biological mechanisms. Since the individual functional differences in the brain, in turn, shape the behavior, sex-specific psychological/behavioral differences that can be observed in infants but also adults are consequently addressed. Finally, we briefly mention sex-dependent variations in susceptibility to selected disorders as well as their pathophysiology, diagnosis, and response to therapy. The understanding of biologically determined variability between males and females can have important implications, especially in gender-specific health care. We have the impression that it is very important to emphasize that sex matters. Males and females are differently programmed by nature, and it must be respected. Even though we as males and females are not the same, we would like to emphasize that we are still equal and together form a worthy colorful continuum.
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Affiliation(s)
- Szadvári Ivan
- Institute of Physiology, Medical School, Comenius University, Bratislava, Slovakia
| | - Ostatníková Daniela
- Institute of Physiology, Medical School, Comenius University, Bratislava, Slovakia
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10
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deMayo BE, Jordan AE, Olson KR. Gender Development in Gender Diverse Children. ANNUAL REVIEW OF DEVELOPMENTAL PSYCHOLOGY 2022; 4:207-229. [PMID: 37638126 PMCID: PMC10457095 DOI: 10.1146/annurev-devpsych-121020-034014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
Within "mainstream" developmental science, gender researchers largely study the developmental trajectory of children considered to be "gender-typical", while research housed primarily in psychiatry and clinical psychology often documents the trajectories of gender diverse children. This article aims to bridge the studies of gender diversity and "mainstream" gender development. First, we review literature on the development of four commonly studied subgroups of gender diverse children - children referred to medical clinics because of their gender identity and expression, transgender children, female children with congenital adrenal hyperplasia, and tomboys - highlighting how these gender trajectories do or do not align with modal developmental patterns. We then describe social, cognitive, and biological determinants of gender in light of their implications for understanding diverse gender development. Finally, we note methodological suggestions for future research, with an eye toward better integrating research on gender diversity into "mainstream" gender development research.
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Affiliation(s)
- Benjamin E deMayo
- Department of Psychology, Princeton University, Princeton, New Jersey, USA
| | - Ashley E Jordan
- Department of Psychology, Princeton University, Princeton, New Jersey, USA
| | - Kristina R Olson
- Department of Psychology, Princeton University, Princeton, New Jersey, USA
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11
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Fine C. Fairly Criticized, or Politicized? Conflicts in the Neuroscience of Sex Differences in the Human Brain. Cold Spring Harb Perspect Biol 2022; 14:a039115. [PMID: 34872970 PMCID: PMC9341467 DOI: 10.1101/cshperspect.a039115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Investigations of sex differences in the human brain take place on politically sensitive terrain. While some scholars express concern that gendered biases and stereotypes remain embedded in scientific research, others are alarmed about the politicization of science. To help better understand these debates, this review sets out three kinds of conflicts that can arise in the neuroscience of sex differences: academic freedom versus gender equality; frameworks, background assumptions, and dominant methodologies; and inductive risk and social values. The boundaries between fair criticism and politicization are explored for each kind of conflict, pointing to ways in which the academic community can facilitate fair criticism while protecting against politicization.
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Affiliation(s)
- Cordelia Fine
- History & Philosophy of Science Programme, School of Historical & Philosophical Studies, The University of Melbourne, Victoria 3010, Australia
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12
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Swift-Gallant A, Shirazi T, Puts DA, Breedlove SM. Evidence for Perinatal Steroid Influence on Human Sexual Orientation and Gendered Behavior. Cold Spring Harb Perspect Biol 2022; 14:a039123. [PMID: 34872968 PMCID: PMC9341466 DOI: 10.1101/cshperspect.a039123] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
In laboratory animals, exposure to gonadal steroid hormones before and immediately after birth can exert permanent effects on many behaviors, particularly reproductive behaviors. The extent to which such effects occur in humans remains an open question, but several lines of evidence indicate that perinatal levels of both androgens and estrogens may affect adult human psychology and behavior, including sexual orientation and gender nonconformity. Some putative indicators of prenatal androgen exposure, including the ratio of the length of the index finger to that of the ring finger (2D:4D), have repeatedly indicated that lesbians, on average, were exposed to more prenatal androgens than straight women, suggesting that sufficient fetal androgen exposure predisposes a fetus to gynephilia (attraction to women) at maturity. The digit ratios of gay men do not differ from those of straight men, suggesting that prenatal androgen levels are not responsible for their androphilia (attraction to men). However, evidence that gay men who prefer an insertive anal sex role (ASR) have more masculine digit ratios than those preferring a receptive ASR suggests that early androgens influence some sexual preferences in men. Furthermore, digit ratios among gay men have been found to correlate with recalled childhood gender nonconformity (CGN). People with isolated gonadotropin-releasing hormone (GnRH) deficiency (IGD) offer further insight into the effects of perinatal gonadal steroid exposure. In people with IGD, gonadal hormone production is low or absent after the first trimester of gestation. However, because placental gonadotropins drive gonadal hormone secretion during the first trimester when genitalia sexually differentiate, individuals with IGD are unambiguously male or female at birth, consistent with their chromosomal and gonadal sex. Men with IGD report greater CGN, again suggesting that perinatal androgen exposure contributes to male-typical behavioral patterns in humans. Interestingly, women with IGD report less androphilia and more bisexuality than control women, suggesting that perinatal ovarian steroids in females typically augment androphilia in adulthood. Taken together, these findings indicate that the perinatal hormonal milieu influences human sexual orientation and gender conformity.
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Affiliation(s)
- Ashlyn Swift-Gallant
- Department of Psychology, Memorial University of Newfoundland, St. John's A1B 3X9, Newfoundland and Labrador
| | - Talia Shirazi
- Department of Anthropology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - David A Puts
- Department of Anthropology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - S Marc Breedlove
- Neuroscience Program, Michigan State University, East Lansing, Michigan 48824, USA
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13
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Cesario's framework for understanding group disparities is radically incomplete. Behav Brain Sci 2022; 45:e94. [PMID: 35550026 DOI: 10.1017/s0140525x21000856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cesario argues that experimental studies of bias tell us little about why group disparities exist. We argue that Cesario's alternative approach implicitly frames understanding of group disparities as a false binary between "bias" and "group differences." This, we suggest, will contribute little to our understanding of the complex dynamics that produce group disparities, and risks inappropriately rationalizing them.
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14
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Bakker J. The role of steroid hormones in the sexual differentiation of the human brain. J Neuroendocrinol 2022; 34:e13050. [PMID: 34708466 DOI: 10.1111/jne.13050] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 09/03/2021] [Accepted: 10/05/2021] [Indexed: 12/31/2022]
Abstract
Widespread sex differences in human brain structure and function have been reported. Research on animal models has demonstrated that sex differences in brain and behavior are induced by steroid hormones during specific, hormone sensitive, developmental periods. It was shown that typical male neural and behavioral characteristics develop under the influence of testosterone, mostly acting during perinatal development. By contrast, typical female neural and behavioral characteristics may actually develop under the influence of estradiol during a specific prepubertal period. This review provides an overview of our current knowledge on the role of steroid hormones in the sexual differentiation of the human brain. Both clinical and neuroimaging data obtained in patients with altered androgen levels/actions (i.e., congenital adrenal hyperplasia or complete androgen insensitivity syndrome [CAIS]), point to an important role of (prenatal) androgens in inducing typical male neural and psychosexual characteristics in humans. In contrast to rodents, there appears to be no obvious role for estrogens in masculinizing the human brain. Furthermore, data from CAIS also suggest a contribution of sex chromosome genes to the development of the human brain. The final part of this review is dedicated to a brief discussion of gender incongruence, also known as gender dysphoria, which has been associated with an altered or less pronounced sexual differentiation of the brain.
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Affiliation(s)
- Julie Bakker
- Neuroendocrinology, GIGA Neurosciences, Liège University, Liege, Belgium
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15
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Riva D. Sex and gender difference in cognitive and behavioral studies in developmental age: An introduction. J Neurosci Res 2021; 101:543-552. [PMID: 34687075 DOI: 10.1002/jnr.24970] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 09/01/2021] [Accepted: 09/03/2021] [Indexed: 11/09/2022]
Abstract
This paper introduces a special issue focused on sex and gender (s/g) cognitive/behavioral differences at developmental ages providing an overview of this multifaceted and debated topic. It will provide a description of the biological systems that are strongly interconnected to generate s/g differences, that is, genetic determinants, sex hormones, differences in brain structure, organization, and/or function, inherited or modifiable under environmental pressures. Developmental studies are rare. Some addressed whether s/g differences in cognitive/behavioral characteristics are evident early in life and are consistent throughout development, entailing that s/g differences can follow the evolving steps in girls and boys in different domains. The data are far from being homogeneous and consistent about s/g difference in language, social skills, and visuo/spatial abilities. The differences are small, often with overlapping performances, similar to what is seen in adulthood. Given that several variables and the interactions between them are implicated, further longitudinal studies adopting adequate assessment tools, very large size multicultural samples stratified in different, well-sized and precise age groups, considering biological and sociocultural variables, are needed. Due to the complexity of the issue, there is still the need to support and adopt an s/g difference approach also in cognitive and behavioral studies at developmental ages. Finally, these studies have not only scientific importance and relevant cultural, anthropological, and social implications, but are also useful for pedagogical programming as well as for the study of the different susceptibility to develop CNS diseases and consequently to promote different therapies and treatments.
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Affiliation(s)
- Daria Riva
- Developmental Neurology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy.,Fondazione Pierfranco e Luisa Mariani, Milano, Italy.,Fondazione Together To Go, Milano, Italy
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16
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Gui A. A Neurodevelopmental Perspective on Sex-Differentiated Genetic Effects on Behavior. Biol Psychiatry 2021; 89:e63-e65. [PMID: 34082888 DOI: 10.1016/j.biopsych.2021.04.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Gui
- Department of Psychological Sciences, Centre for Brain and Cognitive Development, Birkbeck, University of London, London, United Kingdom.
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17
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Fausto-Sterling A. A Dynamic Systems Framework for Gender/Sex Development: From Sensory Input in Infancy to Subjective Certainty in Toddlerhood. Front Hum Neurosci 2021; 15:613789. [PMID: 33897391 PMCID: PMC8062721 DOI: 10.3389/fnhum.2021.613789] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 03/01/2021] [Indexed: 11/13/2022] Open
Abstract
From birth to 15 months infants and caregivers form a fundamentally intersubjective, dyadic unit within which the infant's ability to recognize gender/sex in the world develops. Between about 18 and 36 months the infant accumulates an increasingly clear and subjective sense of self as female or male. We know little about how the precursors to gender/sex identity form during the intersubjective period, nor how they transform into an independent sense of self by 3 years of age. In this Theory and Hypothesis article I offer a general framework for thinking about this problem. I propose that through repetition and patterning, the dyadic interactions in which infants and caregivers engage imbue the infant with an embodied, i.e., sensori-motor understanding of gender/sex. During this developmental period (which I label Phase 1) gender/sex is primarily an intersubjective project. From 15 to 18 months (which I label Phase 2) there are few reports of newly appearing gender/sex behavioral differences, and I hypothesize that this absence reflects a period of developmental instability during which there is a transition from gender/sex as primarily inter-subjective to gender/sex as primarily subjective. Beginning at 18 months (i.e., the start of Phase 3), a toddler's subjective sense of self as having a gender/sex emerges, and it solidifies by 3 years of age. I propose a dynamic systems perspective to track how infants first assimilate gender/sex information during the intersubjective period (birth to 15 months); then explore what changes might occur during a hypothesized phase transition (15 to 18 months), and finally, review the emergence and initial stabilization of individual subjectivity-the period from 18 to 36 months. The critical questions explored focus on how to model and translate data from very different experimental disciplines, especially neuroscience, physiology, developmental psychology and cognitive development. I close by proposing the formation of a research consortium on gender/sex development during the first 3 years after birth.
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Affiliation(s)
- Anne Fausto-Sterling
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, United States
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18
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Stewart-Williams S, Halsey LG. Men, women and STEM: Why the differences and what should be done? EUROPEAN JOURNAL OF PERSONALITY 2021. [DOI: 10.1177/0890207020962326] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
It is a well-known and widely lamented fact that men outnumber women in a number of fields in STEM (science, technology, engineering and maths). The most commonly discussed explanations for the gender gaps are discrimination and socialization, and the most common policy prescriptions target those ostensible causes. However, a great deal of evidence in the behavioural sciences suggests that discrimination and socialization are only part of the story. The purpose of this paper is to highlight other aspects of the story: aspects that are commonly overlooked or downplayed. More precisely, the paper has two main aims. The first is to examine the evidence that factors other than workplace discrimination contribute to the gender gaps in STEM. These include relatively large average sex differences in career and lifestyle preferences, and relatively small average differences in cognitive aptitudes – some favouring males, others favouring females – which are associated with progressively larger differences the further above the average one looks. The second aim is to examine the evidence suggesting that these sex differences are not purely a product of social factors but also have a substantial biological (i.e. inherited) component. A more complete picture of the causes of the unequal sex ratios in STEM may productively inform policy discussions.
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Affiliation(s)
| | - Lewis G Halsey
- Department of Life Sciences, University of Roehampton, London, UK
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19
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Galiano V, Solazzo G, Rabinovici J, Nahid F, Rina H, Baccarelli AA, Machtinger R. Cord blood androgen levels of females from same sex and opposite sex twins - A pilot study. Clin Endocrinol (Oxf) 2021; 94:85-89. [PMID: 32810873 DOI: 10.1111/cen.14317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 07/25/2020] [Accepted: 08/03/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Opposite-sex twins have shown behavioural and reproductive differences between females and males. These differences may be determined by higher intrauterine levels of androgens among females that were exposed to a male co-twin. The aim of this study was to compare cord blood androgen levels in females from same-sex and opposite-sex twins. DESIGN A prospective study. In this pilot study, we compared cord blood androgens (DHEA-S, Δ-4 androstenedione, total testosterone-TT) and sex hormone-binding globulin (SHBG) levels in 20 females from same sex and 20 females from opposite-sex dichorionic diamniotic twins. We used generalized estimating equation (GEE) modelling to assess differences in cord blood androgens between females from same-sex twin pregnancies and females from opposite-sex twin pregnancies. PATIENTS Twenty opposite-sex twin pairs (female-male twins) and 20 same-sex twin pairs (female-female). MEASUREMENTS Cord blood total testosterone, Δ-4 androstenedione, DHEA-S and sex hormone-binding globulin (SHBG) levels. RESULTS No difference in the levels of androgens as Δ-4 androstenedione, total testosterone and SHBG was identified between females that were exposed to a female co-twin compared with females that were exposed to a male co-twin. DHEA-S levels were significantly lower among females from opposite-sex twins compared with females from same-sex twins. CONCLUSIONS Our preliminary data do not support the hypothesis that females exposed to male co-twins are exposed to higher levels of androgens in utero compared with females exposed to female co-twins. Further studies are needed to explain the reported behavioural and reproductive differences among opposite-sex twins.
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Affiliation(s)
- Valentina Galiano
- Department of Obstetrics and Gynecology, San Paolo Hospital Medical School, University of Milan, Milan, Italy
| | - Giulia Solazzo
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Jaron Rabinovici
- Department of Obstetrics and Gynecology, Sheba Medical Center, Tel Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Farzam Nahid
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel Hashomer, Israel
| | - Hemi Rina
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel Hashomer, Israel
| | - Andrea A Baccarelli
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Ronit Machtinger
- Department of Obstetrics and Gynecology, Sheba Medical Center, Tel Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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20
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Spencer D, Pasterski V, Neufeld SAS, Glover V, O'Connor TG, Hindmarsh PC, Hughes IA, Acerini CL, Hines M. Prenatal androgen exposure and children's gender-typed behavior and toy and playmate preferences. Horm Behav 2021; 127:104889. [PMID: 33181133 PMCID: PMC7856278 DOI: 10.1016/j.yhbeh.2020.104889] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 10/23/2022]
Abstract
We report findings from two studies investigating possible relations of prenatal androgen exposure to a broad measure of children's gender-typed behavior, as well as specifically to children's toy and playmate preferences. Study 1 investigated these outcomes for 43 girls and 38 boys, aged 4 to 11 years, with congenital adrenal hyperplasia (CAH, a genetic condition causing increased adrenal androgen production beginning prenatally) compared to similarly-aged, unaffected relatives (41 girls, 31 boys). The predicted sex differences were found for all of the outcome measures. Furthermore, girls with CAH showed increased male-typical and decreased female-typical behavior and toy and playmate preferences compared to unaffected girls. Study 2 investigated the relationship of amniotic fluid testosterone to gender-typed behavior and toy and playmate preferences in typically developing children (48 girls, 44 boys) aged 3 to 5 years. Although the predicted sex differences were found for all of the outcome measures, amniotic fluid testosterone was not a significant correlate, in the predicted direction, of any outcome measure for either sex. The results of study 1 provide additional support for an influence of prenatal androgen exposure on children's gender-typed behavior, including toy and playmate preferences. The results of study 2 do not, but amniotic fluid testosterone may be an insufficiently sensitive measure of early androgen exposure. A more sensitive and reliable measure of prenatal androgen exposure may be needed to consistently detect relations to later gender typed behavior in non-clinical populations.
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Affiliation(s)
- Debra Spencer
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
| | - Vickie Pasterski
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom; Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
| | - Sharon A S Neufeld
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
| | - Vivette Glover
- Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom.
| | - Thomas G O'Connor
- School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, NY 14642, USA.
| | - Peter C Hindmarsh
- Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, United Kingdom.
| | - Ieuan A Hughes
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
| | - Carlo L Acerini
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
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21
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Abstract
Human gender-related behavior/psychology is shaped by a developmental system that involves numerous influences interacting over time. Understanding of the full range of elements in the system and how they interact is currently incomplete. The available evidence suggests, however, that early exposure to testosterone, postnatal socialization, e.g., by parents and peers, and self-socialization related to cognitive understanding of gender are important elements. This article focuses on prenatal and early neonatal influences of testosterone on gender-related psychological/behavioral outcomes, and contextualizes these hormonal influences within an understanding of socialization influences. There is consistent evidence that early testosterone exposure influences childhood gender role behavior, including sex-typical toy play, as well as gender identity and sexual orientation. Evidence for similar hormonal influences on spatial ability and on traits related to autism, or autistic spectrum disorder, is inconsistent. Evidence from girls exposed to elevated testosterone prenatally suggests that they experience alterations in processes of external socialization, as well as self-socialization, and that these, along with early testosterone exposure, shape gender-related outcomes.
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Affiliation(s)
- Melissa Hines
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge, CB2 3RQ, UK.
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22
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Engberg H, Möller A, Hagenfeldt K, Nordenskjöld A, Frisén L. Identity, Sexuality, and Parenthood in Women with Congenital Adrenal Hyperplasia. J Pediatr Adolesc Gynecol 2020; 33:470-476. [PMID: 32473322 DOI: 10.1016/j.jpag.2020.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 11/17/2022]
Abstract
STUDY OBJECTIVE To explore how women with congenital adrenal hyperplasia (CAH) describe their experiences of gender role behavior, psychosexual development, and intimate relationships. CAH results in increased androgen exposure in affected females, and is the most common reason for unclear sex at birth. Women with CAH have been studied to find answers to the role of androgens in psychosexual development. Nevertheless, factors that may account for the variability of outcomes in women with CAH are unclear. DESIGN, SETTING AND PARTICIPANTS This was a qualitative study with 13 Swedish women (aged ≥18 years) with CAH. Semi-structured interviews were analyzed using inductive content analysis. MAIN OUTCOME MEASURES Direct quotes of patients' experiences derived from interview transcripts were sorted in categories, subcategories, and according to latent theme. RESULTS The main categories were "forming identity" and "establishing relationships." Forming identity encompasses that of a girl, a tomboy, and/or a woman. Establishing relationships focuses on intimate relationships, pregnancy, and parenthood. A latent theme was interpreted as "shifting perspectives," with CAH being the main focus of some participants' lives but a side issue for others. CONCLUSION These women's experiences are varied and describe shifting perspectives on how much CAH affects their lives. Health care providers can play an important role in helping women with CAH to separate what is caused by the condition and what is not. The long-term goal is to help girls and women to feel in control of their condition across their whole life.
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Affiliation(s)
- Hedvig Engberg
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Child and Adolescent Psychiatry Research Centre, Stockholm, Sweden; Department of Women's and Children's Health, Division of Obstetrics and Gynecology, Karolinska Institutet, Stockholm, Sweden.
| | - Anders Möller
- Ersta Sköndal University College, Campus Bräcke, Gothenburg, Sweden
| | - Kerstin Hagenfeldt
- Department of Women's and Children's Health, Division of Obstetrics and Gynecology, Karolinska Institutet, Stockholm, Sweden
| | - Agneta Nordenskjöld
- Department of Women's and Children's Health, Pediatric Surgery Unit and Centre for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden; Pediatric Surgery, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Louise Frisén
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden; Child and Adolescent Psychiatry Research Centre, Stockholm, Sweden
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23
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Wood EK, Jarman P, Cash E, Baxter A, Capitanio JP, Higley JD. Masculinized Second-to-Fourth Digit Ratio (2D:4D Ratio) Is Associated With Lower Cortisol Response in Infant Female Rhesus Monkeys ( Macaca mulatta). Front Behav Neurosci 2020; 14:94. [PMID: 33088262 PMCID: PMC7497207 DOI: 10.3389/fnbeh.2020.00094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 05/18/2020] [Indexed: 01/02/2023] Open
Abstract
The second-to-fourth digit ratio (2D:4D ratio) is considered a postnatal proxy measure for the degree of prenatal androgen exposure (PAE), which is the primary factor responsible for masculinizing the brain of a developing fetus. Some studies suggest that the organizational effects of PAE may extend to the hypothalamic-pituitary-adrenal (HPA) axis response to stress. This study investigates the relationship between 2D:4D ratio and HPA axis functioning using a rhesus monkey (Macaca mulatta) model. Subjects were N = 268 (180 females, 88 males) rhesus monkey infants (3–4 months of age). Plasma cortisol concentrations were assayed from two blood samples obtained during a 25-h experimental social separation stressor at 2- and 7-h post-separation. Subjects’ 2D:4D ratio was measured later in life (Mage = 6.70 years). It was hypothesized that infant rhesus monkeys that exhibited a more masculine-like 2D:4D ratio would show lower levels of circulating cortisol after a social separation and relocation stressor. The results showed that there was a sex difference in the left-hand 2D:4D ratio. The results also showed that there was an overall sex difference in cortisol concentrations and that female, but not male, monkeys that exhibited a more masculine-like right- and left-hand 2D:4D ratio exhibited lower mean stress-induced cortisol concentrations early in life. These findings suggest that higher levels of prenatal androgens in females, as measured by 2D:4D ratio, may be related to an attenuated HPA axis stress-response, as measured by plasma cortisol levels. To the extent that these findings generalize to humans, they suggest that the organizational effects of PAE extend to the infant HPA axis, modulating the HPA axis response, particularly in females.
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Affiliation(s)
- Elizabeth K Wood
- Department of Psychology, Brigham Young University, Provo, UT, United States
| | - Parker Jarman
- Department of Psychology, Brigham Young University, Provo, UT, United States
| | - Elysha Cash
- Department of Psychology, Brigham Young University, Provo, UT, United States
| | - Alexander Baxter
- Department of Psychology, University of California, Davis, Davis, CA, United States.,California National Primate Research Center (CNPRC), Davis, CA, United States
| | - John P Capitanio
- Department of Psychology, University of California, Davis, Davis, CA, United States.,California National Primate Research Center (CNPRC), Davis, CA, United States
| | - J Dee Higley
- Department of Psychology, Brigham Young University, Provo, UT, United States
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24
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Balthazart J. Sexual partner preference in animals and humans. Neurosci Biobehav Rev 2020; 115:34-47. [PMID: 32450091 PMCID: PMC7484171 DOI: 10.1016/j.neubiorev.2020.03.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 03/11/2020] [Accepted: 03/24/2020] [Indexed: 12/25/2022]
Abstract
Sex differences in brain and behavior of animals including humans result from an interaction between biological and environmental influences. This is also true for the differences between men and women concerning sexual orientation. Sexual differentiation is mediated by three groups of biological mechanisms: early actions of sex steroids, more direct actions of sex-specific genes not mediated by gonadal sex steroids and epigenetic mechanisms. Differential interactions with parents and conspecifics have additionally long-term influences on behavior. This presentation reviews available evidence indicating that these different mechanisms play a significant role in the control of sexual partner preference in animals and humans, in other words the homosexual versus heterosexual orientation. Clinical and epidemiological studies of phenotypically selected populations indicate that early actions of hormones and genetic factors clearly contribute to the determination of sexual orientation. The maternal embryonic environment also modifies the incidence of male homosexuality via immunological mechanisms. The relative contribution of each of these mechanisms remains however to be determined.
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25
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Messina V, Karlsson L, Hirvikoski T, Nordenström A, Lajic S. Cognitive Function of Children and Adolescents With Congenital Adrenal Hyperplasia: Importance of Early Diagnosis. J Clin Endocrinol Metab 2020; 105:5700796. [PMID: 31927590 PMCID: PMC7343998 DOI: 10.1210/clinem/dgaa016] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 01/09/2020] [Indexed: 11/19/2022]
Abstract
CONTEXT Patients with classic congenital adrenal hyperplasia (CAH) are treated postnatally with lifelong glucocorticoid (GC) replacement therapy. Previous results on general cognitive ability in individuals with CAH have been conflicting. OBJECTIVE To evaluate long-term cognitive effects of GC replacement therapy and the impact of early diagnosis in children with CAH. DESIGN AND SETTING Observational study with patients from a single research institute. PATIENTS 32 children with CAH (mean age 11.5 years) identified through the Swedish national neonatal screening program for CAH and 52 matched population controls (mean age 10.7 years). Eleven (6 female) children with CAH who were treated prenatally with dexamethasone (DEX), (CAH-DEX) (mean age 11.7 years). INTERVENTION GC replacement therapy, neonatal screening for CAH. MEASURES Cognitive abilities assessed with standardized neuropsychological tests (Wechsler scales, Span Board Test, Stroop Interference Test, NEPSY list learning). RESULTS Children with CAH (not prenatally treated) performed equally well as population controls on a series of tests assessing general intellectual ability and executive functions. No significant differences were observed in cognitive performance between patients with different genotypes (null, non-null). Patients with salt-wasting CAH performed poorer than patients with simple virilizing CAH in a test assessing visuo-spatial working memory (P = 0.039), although the performance was within the normal range for the population. Prenatally DEX-treated girls with CAH had lower verbal intellectual ability compared with CAH girls not exposed to prenatal treatment (P = 0.037). CONCLUSION Children and adolescents with CAH who were diagnosed early via a neonatal screening program and treated with hydrocortisone had normal psychometric intelligence and executive functions.
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Affiliation(s)
- Valeria Messina
- Department of Women’s and Children’s Health, Karolinska Institutet, Pediatric Endocrinology Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Leif Karlsson
- Department of Women’s and Children’s Health, Karolinska Institutet, Pediatric Endocrinology Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Tatja Hirvikoski
- Department of Women’s and Children’s Health, Pediatric Neuropsychiatry Unit, Center for Neurodevelopmental Disorders at Karolinska Institutet (KIND), Karolinska Institutet, Stockholm, Sweden
- Unit for Habilitation & Health, Stockholm County Council, Stockholm, Sweden
| | - Anna Nordenström
- Department of Women’s and Children’s Health, Karolinska Institutet, Pediatric Endocrinology Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Svetlana Lajic
- Department of Women’s and Children’s Health, Karolinska Institutet, Pediatric Endocrinology Unit, Karolinska University Hospital, Stockholm, Sweden
- Correspondence and Reprint Requests: Dr. Svetlana Lajic at the Department of Women’s and Children’s Health, Pediatric Endocrinology Unit (QB83), Karolinska University Hospital, SE-171 76 Stockholm, Sweden. E-mail:
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26
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Collaer ML, Hines M. No Evidence for Enhancement of Spatial Ability with Elevated Prenatal Androgen Exposure in Congenital Adrenal Hyperplasia: A Meta-Analysis. ARCHIVES OF SEXUAL BEHAVIOR 2020; 49:395-411. [PMID: 32052211 PMCID: PMC8784244 DOI: 10.1007/s10508-020-01645-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 01/19/2020] [Accepted: 01/21/2020] [Indexed: 05/12/2023]
Abstract
Spatial abilities contribute to life and occupational competencies, and certain spatial skills differ, on average, between males and females, typically favoring males when differences occur. Factors contributing to spatial skills could include prenatal as well as experiential/cultural influences, with biological and social influences likely interacting and difficult to disentangle. This meta-analysis examined the potential influence of prenatal androgen exposure on spatial skill by examining studies of patients with congenital adrenal hyperplasia (CAH). CAH involves elevated adrenal androgens prenatally, with overall androgen concentrations higher for females with CAH versus same-sex controls but with little overall difference between males with CAH versus controls. We hypothesized that, if androgens contribute prenatally to neurobehavioral development in humans as in many other species, females with CAH would show spatial enhancement versus control females, but with no definitive hypothesis for males. Meta-analysis of 12 studies examining overall spatial skill and three spatial subcategories failed to support enhanced spatial performance for females with CAH; males with CAH showed lower spatial ability compared to control males, at least for the category of overall spatial skill. Although statistical logic precludes accepting the null hypothesis for females, the meta-analysis failed to support the idea that prenatal exposure to androgens explains spatial gender/sex differences in humans. Alternative explanations for average gender/sex differences in some spatial tasks could include androgen exposure at other times, such as mini-puberty, or different social factors experienced by males and females. We also discuss possible explanations for the different outcomes seen in females versus males with CAH.
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Affiliation(s)
- Marcia L Collaer
- Department of Psychology and Program in Neuroscience, Middlebury College, Middlebury, VT, 05753, USA.
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Cambridge, UK
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27
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Gegenhuber B, Tollkuhn J. Signatures of sex: Sex differences in gene expression in the vertebrate brain. WILEY INTERDISCIPLINARY REVIEWS. DEVELOPMENTAL BIOLOGY 2020; 9:e348. [PMID: 31106965 PMCID: PMC6864223 DOI: 10.1002/wdev.348] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/10/2019] [Accepted: 04/22/2019] [Indexed: 12/13/2022]
Abstract
Women and men differ in disease prevalence, symptoms, and progression rates for many psychiatric and neurological disorders. As more preclinical studies include both sexes in experimental design, an increasing number of sex differences in physiology and behavior have been reported. In the brain, sex-typical behaviors are thought to result from sex-specific patterns of neural activity in response to the same sensory stimulus or context. These differential firing patterns likely arise as a consequence of underlying anatomic or molecular sex differences. Accordingly, gene expression in the brains of females and males has been extensively investigated, with the goal of identifying biological pathways that specify or modulate sex differences in brain function. However, there is surprisingly little consensus on sex-biased genes across studies and only a handful of robust candidates have been pursued in the follow-up experiments. Furthermore, it is not known how or when sex-biased gene expression originates, as few studies have been performed in the developing brain. Here we integrate molecular genetic and neural circuit perspectives to provide a conceptual framework of how sex differences in gene expression can arise in the brain. We detail mechanisms of gene regulation by steroid hormones, highlight landmark studies in rodents and humans, identify emerging themes, and offer recommendations for future research. This article is categorized under: Nervous System Development > Vertebrates: General Principles Gene Expression and Transcriptional Hierarchies > Regulatory Mechanisms Gene Expression and Transcriptional Hierarchies > Sex Determination.
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Affiliation(s)
- Bruno Gegenhuber
- Watson School of Biological Sciences, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York
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28
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Neuroscience and Sex/Gender: Looking Back and Forward. J Neurosci 2019; 40:37-43. [PMID: 31488609 DOI: 10.1523/jneurosci.0750-19.2019] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 08/30/2019] [Accepted: 09/03/2019] [Indexed: 12/18/2022] Open
Abstract
Phoenix et al. (1959) reported that treating pregnant guinea pigs with testosterone had enduring effects on the sex-related behavior of their female offspring. Since then, similar enduring effects of early testosterone exposure have been found in other species, including humans, and for other behaviors that show average sex differences. In humans, the affected outcomes include gender identity, sexual orientation, and children's sex-typical play behavior. The evidence linking early testosterone exposure to sex-typed play is particularly robust, and sex-typed play is also influenced by many other factors, including socialization by parents and peers and self-socialization, based on cognitive understanding of gender. In addition to influencing behavior, testosterone and hormones produced from testosterone affect mammalian brain structure. Studies using human autopsy material have found some sex differences in the human brain similar to those seen in other species, and have reported that some brain sex differences correlate with sexual orientation or gender identity, although the causes of these brain/behavior relationships are unclear. Studies that have imaged the living human brain have found only a small number of sex differences, and these differences are generally small in magnitude. In addition, they have not been linked to robust psychological or behavioral sex differences. Future research might benefit from improved imaging technology, and attention to other brain characteristics. In addition, it might usefully explore how different types of factors, such as early testosterone exposure and parental socialization, work together in the developmental system that produces sex/gender differences in human brain and behavior.
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Onal H, Kutlu E, Aydın B, Ersen A, Topal N, Adal E, Güneş H, Doktur H, Tanıdır C, Pirhan D, Sayın N. Assessment of retinal thickness as a marker of brain masculinization in children with congenital adrenal hyperplasia: a pilot study. J Pediatr Endocrinol Metab 2019; 32:683-687. [PMID: 31199773 DOI: 10.1515/jpem-2018-0397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 04/01/2019] [Indexed: 01/05/2023]
Abstract
Objective To investigate the relationship between brain masculinization and retinal thickness in children with congenital adrenal hyperplasia (CAH). Methods Forty-five patients with CAH aged between 4 and 18 years and 30 age-matched healthy controls were included in this prospective study. Macular area was examined with optical coherence tomography (OCT); central subfield thickness (CST), cube volume (CV) and macular retinal thickness (MT) were measured in each subject. A gender identity questionnaire (GIQ) was used for the evaluation of gender happiness index. Results Girls with CAH had a higher CV (p = 0.002) and MT (p = 0.003) than healthy girls. No significant difference was found between boys with CAH and healthy boys regarding the retinal thickness measurements. Mean CST, CV and MT were significantly higher in boys than in girls in the control group (p = 0.013, p < 0.001, respectively), but there was no significant difference in those parameters between girls and boys with CAH. The gender happiness index was not different between healthy boys and boys with CAH, but was significantly lower in girls with CAH than healthy girls (p = 0.01). Conclusions As retina is part of the brain, our finding appears to be a morphological evidence of the excess androgen exposure on brain structures in girls with CAH. In addition, we suggest using retinal thickness measurements as a marker of prenatal excess androgen exposure in future studies.
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Affiliation(s)
- Hasan Onal
- Health Sciences University, Kanuni Sultan Suleyman Research and Training Hospital, Department of Pediatric Endocrinology and Metabolism, Istanbul, Turkey
| | - Esra Kutlu
- Bezmialem Vakif Universitesi, Tip Fakultesi, Pediatric Endocrinology, Istanbul, Turkey
| | - Banu Aydın
- Health Sciences University, Kanuni Sultan Suleyman Research and Training Hospital, Department of Pediatric Endocrinology and Metabolism, Istanbul, Turkey
| | - Atilla Ersen
- Okmeydanı Research and Training Hospital, Department of Pediatrics, Istanbul, Turkey
| | - Neval Topal
- Health Sciences University, Kanuni Sultan Suleyman Research and Training Hospital, Department of Pediatric Endocrinology and Metabolism, Istanbul, Turkey
| | - Erdal Adal
- Medipol University Faculty of Medicine, Department of Pediatric Endocrinology and Metabolism, Istanbul, Turkey
| | - Hatice Güneş
- Bakirkoy Prof. Dr. Mazhar Osman Education and Research Hospital, Department of Child and Adolescent Psychiatry, Istanbul, Turkey
| | - Hilal Doktur
- Bakirkoy Prof. Dr. Mazhar Osman Education and Research Hospital, Department of Child and Adolescent Psychiatry, Istanbul, Turkey
| | - Canan Tanıdır
- Istanbul Gelisim Universitesi, Psychology, Istanbul, Turkey
| | - Dilara Pirhan
- Kocaeli University School of Medicine, Ophthalmology Department, Kocaeli, Turkey
| | - Nihat Sayın
- Health Sciences University, Kanuni Sultan Suleyman Training and Research Hospital, Department of Ophthalmology, Istanbul, Turkey
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Gegenhuber B, Tollkuhn J. Sex Differences in the Epigenome: A Cause or Consequence of Sexual Differentiation of the Brain? Genes (Basel) 2019; 10:genes10060432. [PMID: 31181654 PMCID: PMC6627918 DOI: 10.3390/genes10060432] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 05/29/2019] [Accepted: 06/03/2019] [Indexed: 12/19/2022] Open
Abstract
Females and males display differences in neural activity patterns, behavioral responses, and incidence of psychiatric and neurological diseases. Sex differences in the brain appear throughout the animal kingdom and are largely a consequence of the physiological requirements necessary for the distinct roles of the two sexes in reproduction. As with the rest of the body, gonadal steroid hormones act to specify and regulate many of these differences. It is thought that transient hormonal signaling during brain development gives rise to persistent sex differences in gene expression via an epigenetic mechanism, leading to divergent neurodevelopmental trajectories that may underlie sex differences in disease susceptibility. However, few genes with a persistent sex difference in expression have been identified, and only a handful of studies have employed genome-wide approaches to assess sex differences in epigenomic modifications. To date, there are no confirmed examples of gene regulatory elements that direct sex differences in gene expression in the brain. Here, we review foundational studies in this field, describe transcriptional mechanisms that could act downstream of hormone receptors in the brain, and suggest future approaches for identification and validation of sex-typical gene programs. We propose that sexual differentiation of the brain involves self-perpetuating transcriptional states that canalize sex-specific development.
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Affiliation(s)
- Bruno Gegenhuber
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
- Watson School of Biological Sciences, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
| | - Jessica Tollkuhn
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
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Wren B, Launer J, Reiss MJ, Swanepoel A, Music G. Can evolutionary thinking shed light on gender diversity? BJPSYCH ADVANCES 2019. [DOI: 10.1192/bja.2019.35] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
SUMMARYIssues of sexual reproduction lie at the core of evolutionary thinking, which often places an emphasis on how individuals attempt to maximise the number of successful offspring that they can produce. At first sight, it may therefore appear that individuals who opt for gender-affirming medical interventions are acting in ways that are evolutionarily disadvantageous. However, there are persuasive hypotheses that might make sense of such choices in evolutionary terms and we explore these here. It is premature to claim knowledge of the extent to which evolutionary arguments can usefully be applied to issues of gender identity, although worth reflecting on the extent to which nature tends towards diversity in matters of sex and gender. The importance of acknowledging and respecting different views in this domain, as well as recognising both the uncertainty and likely multiplicity of causal pathways, has implications for clinicians. We make some suggestions about how clinicians might best respond when faced with requests from patients in this area.LEARNING OBJECTIVESAfter reading this article you will be able to:•understand evolutionary arguments about diversity in human gender identity•identify strengths and weaknesses in evolutionary arguments applied to transgender issues•appreciate the range and diversity of gender experience and gender expression among people who present to specialist gender services, as well as the likely complexities of their reasons for requesting medical intervention.
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Evidence that prenatal testosterone transfer from male twins reduces the fertility and socioeconomic success of their female co-twins. Proc Natl Acad Sci U S A 2019; 116:6749-6753. [PMID: 30886089 PMCID: PMC6452670 DOI: 10.1073/pnas.1812786116] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
During sensitive periods in utero, gonadal steroids help organize biological sex differences in humans and other mammals. In litter-bearing species, chromosomal females passively exposed to prenatal testosterone from male littermates exhibit altered physical and behavioral traits as adults. The consequences of such effects are less well understood in humans, but recent near-doubling of twinning rates in many countries since 1980, secondary to advanced maternal age and increased reliance on in vitro fertilization, means that an increasing subset of females in many populations may be exposed to prenatal testosterone from their male co-twin. Here we use data on all births in Norway (n = 728,842, including 13,800 twins) between 1967 and 1978 to show that females exposed in utero to a male co-twin have a decreased probability of graduating from high school (15.2%), completing college (3.9%), and being married (11.7%), and have lower fertility (5.8%) and life-cycle earnings (8.6%). These relationships remain unchanged among the subsets of 583 and 239 females whose male co-twin died during the first postnatal year and first 28 days of life, respectively, supporting the interpretation that they are due primarily to prenatal exposure rather than to postnatal socialization effects of being raised with a male sibling. Our findings provide empirical evidence, using objectively measured nation-level data, that human females exposed prenatally to a male co-twin experience long-term changes in marriage, fertility, and human capital. These findings support the hypothesis of in utero testosterone transfer between twins, which is likely affecting a small but growing subset of females worldwide.
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Speiser PW, Arlt W, Auchus RJ, Baskin LS, Conway GS, Merke DP, Meyer-Bahlburg HFL, Miller WL, Murad MH, Oberfield SE, White PC. Congenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab 2018; 103:4043-4088. [PMID: 30272171 PMCID: PMC6456929 DOI: 10.1210/jc.2018-01865] [Citation(s) in RCA: 554] [Impact Index Per Article: 92.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 08/27/2018] [Indexed: 01/29/2023]
Abstract
Objective To update the congenital adrenal hyperplasia due to steroid 21-hydroxylase deficiency clinical practice guideline published by the Endocrine Society in 2010. Conclusions The writing committee presents updated best practice guidelines for the clinical management of congenital adrenal hyperplasia based on published evidence and expert opinion with added considerations for patient safety, quality of life, cost, and utilization.
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Affiliation(s)
- Phyllis W Speiser
- Cohen Children’s Medical Center of New York, New York, New York
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York
| | - Wiebke Arlt
- University of Birmingham, Birmingham, United Kingdom
| | | | | | | | - Deborah P Merke
- National Institutes of Health Clinical Center, Bethesda, Maryland
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
| | - Heino F L Meyer-Bahlburg
- New York State Psychiatric Institute, Vagelos College of Physicians & Surgeons of Columbia University, New York, New York
| | - Walter L Miller
- University of California San Francisco, San Francisco, California
| | - M Hassan Murad
- Mayo Clinic’s Evidence-Based Practice Center, Rochester, Minnesota
| | - Sharon E Oberfield
- NewYork–Presbyterian, Columbia University Medical Center, New York, New York
| | - Perrin C White
- University of Texas Southwestern Medical Center, Dallas, Texas
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Kung KTF, Spencer D, Pasterski V, Neufeld SAS, Hindmarsh PC, Hughes IA, Acerini CL, Hines M. Emotional and behavioral adjustment in 4 to 11-year-old boys and girls with classic congenital adrenal hyperplasia and unaffected siblings. Psychoneuroendocrinology 2018; 97:104-110. [PMID: 30015005 DOI: 10.1016/j.psyneuen.2018.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/20/2018] [Accepted: 07/02/2018] [Indexed: 01/27/2023]
Abstract
It has been suggested that atypical hormone environments during early development may contribute to subsequent development of psychopathology. Also, it has been suggested that individuals with the autosomal recessive genetic variant, classic congenital adrenal hyperplasia (CAH), might be at increased risk of psychopathology. The present study examined emotional and behavioral adjustment in young children with CAH and their unaffected siblings in the United Kingdom. The parent-reported version of the Strengths and Difficulties Questionnaire (SDQ) was employed to assess adjustment in children aged 4 to 11 years. There were 38 boys with CAH, 43 girls with CAH, 23 unaffected brothers, and 31 unaffected sisters. No differences in emotional or behavioral problems were found between boys or girls with CAH and unaffected same-sex siblings. In addition, affected and unaffected boys in the current sample generally did not differ from boys in the general population. However, compared with girls in the general population, girls with CAH had more difficulties related to conduct problems, hyperactivity/ inattention, and prosocial behavior, and unaffected sisters had more difficulties related to peer problems, conduct problems, and prosocial behavior. These findings suggest that both girls with CAH and unaffected sisters of girls or boys with CAH may be at increased risk of developing behavioral problems. Potential influences related to the early hormone environment, familial process, and social stigma are considered.
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Affiliation(s)
- Karson T F Kung
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, UK.
| | - Debra Spencer
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, UK
| | - Vickie Pasterski
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, UK; Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - Sharon A S Neufeld
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, UK
| | - Peter C Hindmarsh
- Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
| | - Ieuan A Hughes
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - Carlo L Acerini
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, UK
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36
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Abstract
Gender socialization influences children at early ages, shaping their developing identities. The toys provided by parents deliver some of the earliest gender-based messages by encouraging children to engage in activities associated with, for example, dolls and trucks. In the current study, we measured the influence of parental socialization by assessing 5- and 12 ½-month-old infants' exposure to dolls and trucks and by experimentally manipulating parents' encouragement to play with these toys. We found that infants displayed gender-typical toy preferences at 12 ½, but not 5 months, a pattern characteristic of previous studies. However, brief encouragement by a parent to play with toys from each category was ineffective in altering infants' preferences. Rather, the types of toys present in the home predicted preferences, suggesting that at-home exposure to toys may be influential in the development of toy preferences. These findings reveal that socialization processes may indeed play a role in the formation of early gender-typical toy preferences and highlight the importance of equal toy exposure during infancy to ensure optimal development.
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Affiliation(s)
- Josh L Boe
- Department of Human Development and Family Science, University of Georgia, Athens, GA 30602, USA
| | - Rebecca J Woods
- Department of Human Development and Family Science, North Dakota State University, Dept. 2615, P.O. Box 6050, Fargo, ND 58108, USA
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Berenbaum SA, Beltz AM, Bryk K, McHale S. Gendered Peer Involvement in Girls with Congenital Adrenal Hyperplasia: Effects of Prenatal Androgens, Gendered Activities, and Gender Cognitions. ARCHIVES OF SEXUAL BEHAVIOR 2018; 47:915-929. [PMID: 29318470 PMCID: PMC9173056 DOI: 10.1007/s10508-017-1112-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 08/16/2017] [Accepted: 11/01/2017] [Indexed: 06/07/2023]
Abstract
A key question in understanding gender development concerns the origins of sex segregation. Children's tendencies to interact with same-sex others have been hypothesized to result from gender identity and cognitions, behavioral compatibility, and personal characteristics. We examined whether prenatal androgen exposure was related to time spent with boys and girls, and how that gendered peer involvement was related to sex-typed activities and gender identity and cognitions. We studied 54 girls with congenital adrenal hyperplasia (CAH) aged 10-13 years varying in degree of prenatal androgen exposure: 40 girls with classical CAH (C-CAH) exposed to high prenatal androgens and 14 girls with non-classical CAH (NC-CAH) exposed to low, female-typical, prenatal androgens. Home interviews and questionnaires provided assessments of gendered activity interests and participation, gender identity, and gender cognitions. Daily phone calls over 7 days assessed time spent in gendered activities and with peers. Girls with both C-CAH and NC-CAH interacted more with girls than with boys, with no significant group differences. The groups did not differ significantly in gender identity or gender cognitions, but girls with C-CAH spent more time in male-typed activities and less time in female-typed activities than did girls with NC-CAH. Time spent with girls reflected direct effects of gender identity/cognitions and gender-typed activities, and an indirect effect of prenatal androgens (CAH type) through gender-typed activities. Our results extend findings that prenatal androgens differentially affect gendered characteristics and that gendered peer interactions reflect combined effects of behavioral compatibility and feelings and cognitions about gender. The study also shows the value of natural experiments for testing hypotheses about gender development.
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Affiliation(s)
- Sheri A Berenbaum
- Department of Psychology, 453 Moore Building, The Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Pediatrics, The Pennsylvania State University, University Park, PA, USA.
| | - Adriene M Beltz
- Department of Psychology, University of Michigan, Ann Arbor, MI, USA
| | - Kristina Bryk
- Department of Psychology, 453 Moore Building, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Susan McHale
- Department of Human Development and Family Studies, The Pennsylvania State University, University Park, PA, USA
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Endendijk JJ, Groeneveld MG, Mesman J. The Gendered Family Process Model: An Integrative Framework of Gender in the Family. ARCHIVES OF SEXUAL BEHAVIOR 2018; 47:877-904. [PMID: 29549542 PMCID: PMC5891573 DOI: 10.1007/s10508-018-1185-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 02/27/2018] [Accepted: 03/01/2018] [Indexed: 05/23/2023]
Abstract
This article reviews and integrates research on gender-related biological, cognitive, and social processes that take place in or between family members, resulting in a newly developed gendered family process (GFP) model. The GFP model serves as a guiding framework for research on gender in the family context, calling for the integration of biological, social, and cognitive factors. Biological factors in the model are prenatal, postnatal, and pubertal androgen levels of children and parents, and genetic effects on parent and child gendered behavior. Social factors are family sex composition (i.e., parent sex, sexual orientation, marriage status, sibling sex composition) and parental gender socialization, such as modeling, gender-differentiated parenting, and gender talk. Cognitive factors are implicit and explicit gender-role cognitions of parents and children. Our review and the GFP model confirm that gender is an important organizer of family processes, but also highlight that much is still unclear about the mechanisms underlying gender-related processes within the family context. Therefore, we stress the need for (1) longitudinal studies that take into account the complex bidirectional relationship between parent and child gendered behavior and cognitions, in which within-family comparisons (comparing behavior of parents toward a boy and a girl in the same family) are made instead of between-family comparisons (comparing parenting between all-boy families and all-girl families, or between mixed-gender families and same-gender families), (2) experimental studies on the influence of testosterone on human gender development, (3) studies examining the interplay between biology with gender socialization and gender-role cognitions in humans.
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Affiliation(s)
- Joyce J Endendijk
- Centre for Child and Family Studies, Leiden University, P.O. Box 9555, 2300 RB, Leiden, The Netherlands
- Child and Adolescent Studies, Utrecht University, P.O. Box 80140, 3508 TC, Utrecht, The Netherlands
| | - Marleen G Groeneveld
- Centre for Child and Family Studies, Leiden University, P.O. Box 9555, 2300 RB, Leiden, The Netherlands
| | - Judi Mesman
- Centre for Child and Family Studies, Leiden University, P.O. Box 9555, 2300 RB, Leiden, The Netherlands.
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Fine C, Dupré J, Joel D. Sex-Linked Behavior: Evolution, Stability, and Variability. Trends Cogn Sci 2018; 21:666-673. [PMID: 28821346 DOI: 10.1016/j.tics.2017.06.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 05/11/2017] [Accepted: 06/27/2017] [Indexed: 11/28/2022]
Abstract
Common understanding of human sex-linked behaviors is that proximal mechanisms of genetic and hormonal sex, ultimately shaped by the differential reproductive challenges of ancestral males and females, act on the brain to transfer sex-linked predispositions across generations. Here, we extend the debate on the role of nature and nurture in the development of traits in the lifetime of an individual, to their role in the cross-generation transfer of traits. Advances in evolutionary theory that posit the environment as a source of trans-generational stability, and new understanding of sex effects on the brain, suggest that the cross-generation stability of sex-linked patterns of behavior are sometimes better explained in terms of inherited socioenvironmental conditions, with biological sex fostering intrageneration variability.
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Affiliation(s)
- Cordelia Fine
- History and Philosophy of Science Program, School of Historical and Philosophical Studies, University of Melbourne, Melbourne, VIC, Australia.
| | - John Dupré
- The Centre for the Study of Life Sciences (Egenis), University of Exeter, Exeter, UK
| | - Daphna Joel
- School of Psychological Sciences and Sagol School of Neuroscience, Tel-Aviv University, Tel-Aviv, Israel
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The Sexual Differentiation of the Human Brain: Role of Sex Hormones Versus Sex Chromosomes. Curr Top Behav Neurosci 2018; 43:45-67. [PMID: 30599078 DOI: 10.1007/7854_2018_70] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Men and women differ, not only in their anatomy but also in their behavior. Research using animal models has convincingly shown that sex differences in the brain and behavior are induced by sex hormones during a specific, hormone-sensitive period during early development. Thus, male-typical psychosexual characteristics seem to develop under the influence of testosterone, mostly acting during early development. By contrast, female-typical psychosexual characteristics may actually be organized under the influence of estradiol during a specific prepubertal period. The sexual differentiation of the human brain also seems to proceed predominantly under the influence of sex hormones. Recent studies using magnetic resonance imaging have shown that several sexually differentiated aspects of brain structure and function are female-typical in women with complete androgen insensitivity syndrome (CAIS), who have a 46 XY karyotype but a female phenotype due to complete androgen resistance, suggesting that these sex differences most likely reflect androgen action, although feminizing effects of estrogens or female-typical socialization cannot be ruled out. By contrast, some male-typical neural characteristics were also observed in women with CAIS suggesting direct effects of sex chromosome genes in the sexual differentiation of the human brain. In conclusion, the sexual differentiation of the human brain is most likely a multifactorial process including both sex hormone and sex chromosome effects, acting in parallel or in combination.
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Fraternal birth order effect on sexual orientation explained. Proc Natl Acad Sci U S A 2017; 115:234-236. [PMID: 29259109 DOI: 10.1073/pnas.1719534115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Spencer D, Pasterski V, Neufeld S, Glover V, O'Connor TG, Hindmarsh PC, Hughes IA, Acerini CL, Hines M. Prenatal androgen exposure and children's aggressive behavior and activity level. Horm Behav 2017; 96:156-165. [PMID: 28939371 PMCID: PMC5722694 DOI: 10.1016/j.yhbeh.2017.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 09/15/2017] [Accepted: 09/17/2017] [Indexed: 10/18/2022]
Abstract
Some human behaviors, including aggression and activity level, differ on average for males and females. Here we report findings from two studies investigating possible relations between prenatal androgen and children's aggression and activity level. For study 1, aggression and activity level scores for 43 girls and 38 boys, aged 4 to 11years, with congenital adrenal hyperplasia (CAH, a genetic condition causing increased adrenal androgen production beginning prenatally) were compared to those of similarly-aged, unaffected relatives (41 girls, 31 boys). Girls with CAH scored higher on aggression than unaffected girls, d=0.69, and unaffected boys scored higher on activity level than unaffected girls, d=0.50. No other group differences were significant. For study 2, the relationship of amniotic fluid testosterone to aggression and activity level was investigated in typically-developing children (48 girls, 44 boys), aged 3 to 5years. Boys scored higher than girls on aggression, d=0.41, and activity level, d=0.50. However, amniotic fluid testosterone was not a significant predictor of aggression or activity level for either sex. The results of the two studies provide some support for an influence of prenatal androgen exposure on children's aggressive behavior, but not activity level. The within-sex variation in amniotic fluid testosterone may not be sufficient to allow reliable assessment of relations to aggression or activity level.
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Affiliation(s)
- Debra Spencer
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
| | - Vickie Pasterski
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom; Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
| | - Sharon Neufeld
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
| | - Vivette Glover
- Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom.
| | - Thomas G O'Connor
- School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, NY 14642, USA.
| | - Peter C Hindmarsh
- Institute of Child Health, University College London, 30 Guilford Street, London, WC1N 1EH, United Kingdom.
| | - Ieuan A Hughes
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
| | - Carlo L Acerini
- Department of Paediatrics, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, United Kingdom.
| | - Melissa Hines
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge CB2 3RQ, United Kingdom.
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Berenbaum SA. Beyond Pink and Blue: The Complexity of Early Androgen Effects on Gender Development. CHILD DEVELOPMENT PERSPECTIVES 2017; 12:58-64. [PMID: 29736184 DOI: 10.1111/cdep.12261] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Why do girls and women differ from boys and men? Gender development is typically considered to result from socialization, but sex hormones present during sensitive periods of development, particularly prenatal androgens, play an important role. Data from natural experiments, especially from females with congenital adrenal hyperplasia, show the complexity of the effects of androgens on behavior: Prenatal androgens apparently have large effects on interests and engagement in gendered activities; moderate effects on spatial abilities; and relatively small or no effects on gender identity, gender cognitions, and gendered peer involvement. These differential effects provide an opportunity to move beyond identifying sources of variation in behavior to understanding developmental processes. These processes include links among gendered characteristics, psychological and neural mechanisms underlying development, and the joint effects of biological predispositions and social experiences.
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Picut CA, Ziejewski MK, Stanislaus D. Comparative Aspects of Pre- and Postnatal Development of the Male Reproductive System. Birth Defects Res 2017; 110:190-227. [PMID: 29063715 DOI: 10.1002/bdr2.1133] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 08/29/2017] [Accepted: 08/30/2017] [Indexed: 01/01/2023]
Abstract
This review describes pre- and postnatal development of the male reproductive system in humans and laboratory animals, and highlights species differences in the timing and control of hormonal and morphologic events. Major differences are that the fetal testis is dependent on gonadotropins in humans, but is independent of such in rats; humans have an extended postnatal quiescent period, whereas rats exhibit no quiescence; and events such as secretion by the prostate and seminal vesicles, testicular descent, and the appearance of spermatogonia are all prenatal events in humans, but are postnatal events in rats. Major differences in the timing of the developmental sequence between rats and humans include: gonocyte transformation period (rat: postnatal day 0-9; human: includes gestational week 22 to 9 months of age); masculinization programming window (rat: gestational day 15.5-17.5; human: gestational week 9-14); and mini-puberty (rat: 0-6 hr after birth; human: 3-6 months of age). Endocrine disruptors can cause unique lesions in the prenatal and early postnatal testis; therefore, it is important to consider the differences in the timing of the developmental sequence when designing preclinical studies as identification of windows of sensitivity for endocrine disruption or toxicants will aid in interpretation of results and provide clues to a mode of action. Birth Defects Research 110:190-227, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Catherine A Picut
- Charles River Laboratories, Pathology Associates, Durham, North Carolina
| | - Mary K Ziejewski
- GlaxoSmithKline Research & Development, King of Prussia, Pennsylvania
| | - D Stanislaus
- GlaxoSmithKline Research & Development, King of Prussia, Pennsylvania
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van Bever Y, Wolffenbuttel KP, Brüggenwirth HT, Blom E, de Klein A, Eussen BHJ, van der Windt F, Hannema SE, Dessens AB, Dorssers LCJ, Biermann K, Hersmus R, de Rijke YB, Looijenga LHJ. Multiparameter Investigation of a 46,XX/46,XY Tetragametic Chimeric Phenotypical Male Patient with Bilateral Scrotal Ovotestes and Ovulatory Activity. Sex Dev 2017; 12:145-154. [PMID: 28926831 DOI: 10.1159/000479946] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We report on an adult male initially presenting with gynecomastia and a painless scrotal mass without additional genital anomalies. Hyperpigmentation of the skin following the Blaschko's lines was identified. He underwent gonadectomy because of suspected cancer. Histological analyses revealed an ovotestis with ovulatory activity confirmed by immunohistochemistry with multiple markers. Karyotyping of cultured peripheral blood lymphocytes and a buccal smear revealed a 46,XX/46,XY chimeric constitution with different percentages. Multiple molecular analyses as well as blood typing implied a tetragametic origin. After the unilateral gonadectomy, the patient developed recurrent painful cystic swellings of the remaining gonad. Because of the wish to preserve hormonal activity as well as future fertility, the patient underwent surgical resection of a cystic gonadal area. The removed tissue showed ovulation-related features in addition to both testicular and ovarian tissue, diagnosed as an ovotestis. Testosterone therapy was initiated to suppress the persistently elevated gonadotropins and thereby suppress ovarian activity. During treatment, the recurrent pain complaints and cystic swellings ceased, although gonadotropin levels were not fully suppressed. Based on these observations, the importance of a detailed genetic and pathological diagnosis and the clinical dilemmas including the pros and cons of personalized treatment with gonadal preservative surgery are discussed.
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Affiliation(s)
- Yolande van Bever
- Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands
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46
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Ghosh S, Klein RS. Sex Drives Dimorphic Immune Responses to Viral Infections. THE JOURNAL OF IMMUNOLOGY 2017; 198:1782-1790. [PMID: 28223406 DOI: 10.4049/jimmunol.1601166] [Citation(s) in RCA: 146] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 10/24/2016] [Indexed: 02/07/2023]
Abstract
New attention to sexual dimorphism in normal mammalian physiology and disease has uncovered a previously unappreciated breadth of mechanisms by which females and males differentially exhibit quantitative phenotypes. Thus, in addition to the established modifying effects of hormones, which prenatally and postpubertally pattern cells and tissues in a sexually dimorphic fashion, sex differences are caused by extragonadal and dosage effects of genes encoded on sex chromosomes. Sex differences in immune responses, especially during autoimmunity, have been studied predominantly within the context of sex hormone effects. More recently, immune response genes have been localized to sex chromosomes themselves or found to be regulated by sex chromosome genes. Thus, understanding how sex impacts immunity requires the elucidation of complex interactions among sex hormones, sex chromosomes, and immune response genes. In this Brief Review, we discuss current knowledge and new insights into these intricate relationships in the context of viral infections.
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Affiliation(s)
- Soumitra Ghosh
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110
| | - Robyn S Klein
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110; .,Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110; and.,Department of Neuroscience, Washington University School of Medicine, St. Louis, MO 63110
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47
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Controversies of Sex Re-assignment in Genetic Males with Congenital Inadequacy of the Penis. Indian J Pediatr 2017; 84:700-708. [PMID: 28687949 DOI: 10.1007/s12098-017-2412-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 06/08/2017] [Indexed: 10/19/2022]
Abstract
Sex assignment in 46XY genetic male children with congenital inadequacy of the penis (CIP) is controversial. Traditionally, children with penile length less than 2 cm at birth are considered unsuitable to be raised as males. They are typically re-assigned to female-sex and feminizing genitoplasty is usually done in infancy. However, the concept of cerebral androgen imprinting has caused paradigm shift in the philosophy of sex re-assignment. Masculinization of the brain, rather than length of the penis, is the modern criterion of sex re-assignment in CIP. This review summarizes the current understanding of the complex issue. In 46XY children with CIP, male-sex assignment appears appropriate in non-hormonal conditions such as idiopathic micropenis, aphallia and exstrophy. Female-sex re-assignment appears acceptable in complete androgen insensitivity (CAIS), while partial androgen insensitivity syndrome (PAIS) patients are highly dissatisfied with the assignment of either sex. Children with 5-alpha reductase deficiency are likely to have spontaneous penile lengthening at puberty. Hence, they are better raised as males. Although female assignment is common in pure gonadal dysgenesis, long-term results are not known to justify the decision.
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Balthazart J, Court L. Human Sexual Orientation: The Importance of Evidentiary Convergence. ARCHIVES OF SEXUAL BEHAVIOR 2017; 46:1595-1600. [PMID: 28500563 PMCID: PMC5532062 DOI: 10.1007/s10508-017-0997-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 05/02/2017] [Indexed: 05/26/2023]
Affiliation(s)
- Jacques Balthazart
- GIGA Neurosciences, University of Liège, 15 Avenue Hippocrate, 4000, Liège, Belgium.
| | - Lucas Court
- GIGA Neurosciences, University of Liège, 15 Avenue Hippocrate, 4000, Liège, Belgium
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Pasterski V. Fetal Androgens and Human Sexual Orientation: Searching for the Elusive Link. ARCHIVES OF SEXUAL BEHAVIOR 2017; 46:1615-1619. [PMID: 28660433 PMCID: PMC5529473 DOI: 10.1007/s10508-017-1021-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 06/17/2017] [Indexed: 05/04/2023]
Affiliation(s)
- Vickie Pasterski
- Department of Psychology, University of Cambridge, Free School Lane, Cambridge, CB2 3RQ, UK.
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50
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Motta-Mena NV, Puts DA. Endocrinology of human female sexuality, mating, and reproductive behavior. Horm Behav 2017; 91:19-35. [PMID: 27866819 DOI: 10.1016/j.yhbeh.2016.11.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 11/02/2016] [Accepted: 11/12/2016] [Indexed: 10/20/2022]
Abstract
Hormones orchestrate and coordinate human female sexual development, sexuality, and reproduction in relation to three types of phenotypic changes: life history transitions such as puberty and childbirth, responses to contextual factors such as caloric intake and stress, and cyclical patterns such as the ovulatory cycle. Here, we review the endocrinology underlying women's reproductive phenotypes, including sexual orientation and gender identity, mate preferences, competition for mates, sex drive, and maternal behavior. We highlight distinctive aspects of women's sexuality such as the possession of sexual ornaments, relatively cryptic fertile windows, extended sexual behavior across the ovulatory cycle, and a period of midlife reproductive senescence-and we focus on how hormonal mechanisms were shaped by selection to produce adaptive outcomes. We conclude with suggestions for future research to elucidate how hormonal mechanisms subserve women's reproductive phenotypes.
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Affiliation(s)
- Natalie V Motta-Mena
- Department of Psychology, Pennsylvania State University, University Park, PA 16802, United States
| | - David A Puts
- Department of Anthropology, Center for Brain, Behavior, and Cognition, Center for Human Evolution and Diversity, Pennsylvania State University, University Park, PA 16802¸ United States.
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