l'influenza dei geni sull'omosessualità

[elechtra2000]

Ciao a tutti,scrivo in questo forum per chiedere a qualcuno di voi se ha del materiale riguardo alle basi genetiche dell'omosessualità maschile.Infatti questo sarà l'argomento della mia tesi di laurea.Sarebbero utili anche studi su linee famliari e gli spetti evoluzionistici di tale fenomeno (Darwin).Grazie di cuore a quanti mi risponderanno! Marika

[Pandora]

Caspita, non avevo mai sentito parlare di influenza dei geni sull'omosessualità maschile, per lo meno riguardo alla specie umana!

[doctor2009]

Caspita, non avevo mai sentito parlare di influenza dei geni sull'omosessualità maschile, per lo meno riguardo alla specie umana!

Io la trovo anche molto poco plausibile e, comunque, di "valore" più ideologico che scientifico.

[Pandora]

...io aggiungerei che potrebbe diventare anche un pericoloso strumento di etichettamento e di discriminazione.

Immagino le possibili conseguenze di una simile teoria:.... se un'omosessuale maschio ha un figlio maschio ci potrebbero essere tot probabilità che diventi omosessuale?
Magari a qualcuno potrebbe venire in mente qualche tipo di trattamento per impedire che il potenziale omosessuale diventi tale, una sorta di "psicoterapia ortosessuale preventiva"......aiuto!

[willy61]

A Candidate Gene Study of CYP19 (Aromatase) and Male Sexual Orientation.
By: Michael G. DuPree, Michael C.; Brian S. Mustanski, Michael C.; Sven Bocklandt, Michael C.; Caroline Nievergelt, Michael C.; Dean H. Hamer. Behavior Genetics, May2004, Vol. 34 Issue 3, p243-250, 8p Abstract: Aromatase cytochrome P450 (CYP19), which is necessary for the conversion of androgens to estrogens, plays an important role in the sexual differentiation of the brain. To investigate whether differences in the gene encoding the aromatase enzyme influence sexual orientation in men, we conducted linkage, association, and expression analyses in a large sample of homosexual brothers using microsatellite markers in and around CYP19. No linkage was detected, and a gene-specific relative risk of 1.5-fold could be excluded at a lod score of -2. Results of the TDT demonstrated no preferential transmission of any of the CYP19 alleles in this sample. Expression of aromatase mRNA by microarray analysis was not significantly different between heterosexual and homosexual men. These results suggest that variation in the gene for this subunit of the aromatase enzyme complex is not likely to be a major factor in the development of individual differences in male sexual orientation. [ABSTRACT FROM AUTHOR] (AN 12406229)

A therapist's guide to the genetics of human sexual orientation.
By: Mustanski, Brian S.; Bailey, J. Michael. Sexual & Relationship Therapy, Nov2003, Vol. 18 Issue 4, p429-436, 8p; Abstract: Examines the genetic influences on sexual orientation. Question facing therapists on whether genes make people gay; Surveys of Americans that have found an association between the belief that homosexuality is genetically determined and less negative attributes towards gay people; Examination of the question of whether sexual orientation is genetically determined. (AN 11659148)

Legal Rights to Homosexuals into the Areas of Domestic Partnerships and Marriages: Public Support and Genetic Causation Attribution.
By: Tyagart, C.E.. Educational Research Quarterly, Mar2002, Vol. 25 Issue 3, p20, 9p Abstract: In a random national sample of 800 English-speaking adults, ages 18 and over, 26 percent supported legalization of homosexual marriages and 42 percent endorsed homosexual domestic partnerships. The greater the degree to which this sample attributed homosexuality to genetics, the greater was the support for extending homosexual rights. These effects were maintained at the multivariate level of analysis. The effects of genetic attribution for extending homosexual rights seem to benefit from other ideologies. Having a deterministic rather than a free will worldview was a strong influence for homosexual rights. Political liberalism and conservative libertarianism increased support. On the other hand, the moderate bivariate effects of religiosity were eliminated at the multivariate level of analysis. [ABSTRACT FROM AUTHOR] (AN 7600632)

Is male homosexuality maternally linked?
By: McKnight, Jim; Malcolm, Jim. Psychology, Evolution & Gender, Dec2000, Vol. 2 Issue 3, p229-239, 11p, 6 charts Abstract: Is male homosexuality maternally linked? In 1993 Hamer et al. noted a preponderance of male relatives in the maternal lines of gay men relative to heterosexual controls, and then reported a possible X-chromosome linkage to male homosexuality. This paper is the first notice of an ongoing investigation measuring whether this is a maternal inheritance effect or a general fecundity effect through the female line. The test of Hamer's proposition is, first, in finding a difference in the numbers of gay uncles and male cousins between maternal and paternal parental lines; then, in finding a difference in the numbers of gay male cousins between the male and female maternal lines; and last, in finding an increased reproductive rate for maternal line relatives, particularly female ones. A genetic pedigree was taken of a matched sample of 60 straight and 60 homosexual men drawn from the gay population of Sydney, Australia, and the first two tests were not supported and only partial support was found for the third proposition. What was found was a strong maternal line effect for gross reproductive rates and, given the excess of aunts in the sample, it is suggested this is most probably a female line, rather than maternal line effect. [ABSTRACT FROM AUTHOR] DOI: 10.1080/14616660010024599 (AN 4318963)

Etiology of male sexual orientation in an Australian twin sample.
By: Kirk, K.M.; Bailey, J.M.; Martin, N.G.. Psychology, Evolution & Gender, Dec2000, Vol. 2 Issue 3, p301-311, 11p, 2 charts Abstract: Previous studies investigating the etiology of male homosexuality have found evidence for familial aggregation of male homosexuality. However, most of these have used highly selected samples, leading to the possibility that the results obtained are due to volunteer biases. The data analysed here consist of anonymous responses to a questionnaire on sexual behaviour and attitudes obtained from a large community-based sample of Australian male twins aged 18–52. Significant heritabilities were observed for a range of psychological and behavioural measures (orientation of present sexual feelings and fantasies, ever having been sexually attracted to a man, attitude to homosexual sex, number of male and female sexual partners), with approximately 42 to 60 per cent of observed variance estimated to be due to genetic influences in these variables. Familial aggregation was also observed in other measures (sexual behaviour in the past twelve months, attitude to heterosexual sex) but it was not possible to determine whether this was due to genetic or shared environmental influences. [ABSTRACT FROM AUTHOR] DOI: 10.1080/14616660010024418 (AN 4318960)

Measurement Models for Sexual Orientation in a Community Twin Sample.
By: Kirk, K.M.; Bailey, J.M.; Dunne, M.P.; Martin, N.G.. Behavior Genetics, Jul2000, Vol. 30 Issue 4, p345, 12p Abstract: Multivariate structural equation modeling techniques have been applied to examine the causes of individual differences in responses to several items concerning sexual orientation. To minimize potential ascertainment and response biases, the study sample involved a large (N = 4901) community-based cohort of Australian twins aged 18–52 who answered an anonymous questionnaire on sexual behavior and attitudes. The statistical power of the analysis was increased by the availability of multiple measures of sexual orientation (behaviors, attitudes and feelings), providing stronger evidence for the existence of additive genetic influences on this phenotype than in a previous analysis (Bailey et al., 2000). Estimates of the heritability of homosexuality in this sample ranged between 50 and 60% in females but were significantly lower (heritability of approximately 30%) in males. [ABSTRACT FROM AUTHOR] (AN 11304869)

A Twin Registry Study of Male and Female Sexual Orientation.
By: Hershberger, Scott L.. Journal of Sex Research, 1997, Vol. 34 Issue 2, p212-222, 11p, 8 charts, 1 diagram Abstract: Monozygotic (MZ), same sex dizygotic (DZ), and opposite sex (OS) twins from the Minnesota Twin Registry responded to a sexual orientation survey. Using the relative frequencies of heterosexuals, bisexuals, and homosexuals responding to the survey and generalizing these frequencies to the entire Registry, the prevalence of bisexuality among women was estimated as 1.58% and among men, 2.08%. For homosexuality, prevalence rates for women and men were 1.68% and 2.49%, respectively. Homosexual and heterosexual attraction, behavior, and self-identification were significantly more heritable in women than men. For men, no significant genetic effects were found for number of opposite- and same-sex sexual encounters, nor for sexual orientation. No evidence was fouled for different genes influencing the sexual orientation of men and women. [ABSTRACT FROM AUTHOR] (AN 9709072617)

The Biopsychology of Sexual Orientation.
By: Gladue, Brian A.. Current Directions in Psychological Science, Oct94, Vol. 3 Issue 5, p150-154, 5p; Abstract: The origins of homosexuality and lesbianism have been deliberated by scholars and scientists for nearly a century. In scholarly journals as well as in popular media, the debate center around whether one's sexual partner preference (man or woman) can be understood by natural science or is a function of social opportunities, circumstances, and outright choice. These findings, combined with new working hypotheses about psycho-sexual development, have led to the newly emerging viewpoint that sexual orientation is a complex interplay of genetics, neuroanatomy, neuroendocrinology, and environmental factors. DOI: 10.1111/1467-8721.ep10770648 (AN 10770648)

SCIENCE AND THE POLITICS OF PATHOLOGY.
By: Gagnon, John H.. Journal of Sex Research, Feb87, Vol. 23 Issue 1, p120, 4p; Abstract: The article focuses on studies related to science and pathology. A researcher has identified an important continuity with traditional scientific homophobia in his discussion of recent biological and sociological on gender' preference in erotic relations. Historically the strongest supporters for the belief in either the genetic, hormonal, or early childhood origins of gender preference in adult erotic relations could be found among those who were seeking evidence for the pathological origins for what they believed was a pathological outcome. Various points apparently need constant reiteration. Most of the interest that has been expressed about the origins of same gender erotic preference has derived not from its scientific interest but from social and political struggles over the moral, value of homosexuality. If there were no connection between such scientific efforts and specific cultural prejudices, one could afford to be untroubled by what would otherwise be a harmless culturally induced obsession. However, the ways in which scientific hypotheses became the basis for or confirmatory of a vulgar belief in the defective origins of the homosexual poses a more complex question. (AN 5686927)

Buona vita e buona tesi

Guglielmo

[elechtra2000]

Grazie mille Dott. Rottigni,e a voi altri scusate se vi rispondo in ritardo..Non credo neanch'io che siano esclusiavemente i geni a determinare l'identità sessuale di una persona.Credo,infatti,di piu' nell'influenza di un particolare stile genitoriale nei confronti di un figlio.Tuttavia nel giugno del 2008,alcuni ricercatori dell'università di Padova hanno dimostrato che esistono dei fattori genetici che influenzano l'omosessualità e bisessualità maschile...ma le dimostrazioni di ciò vanno oltre al singolo gene che influenzerebbe questo comportamento (Xq28);si parla anche di studi su linee familiari e spiegazioni evoluzionistiche...

[StatoReattivo]

Ciao, probabilmente non ti dirò niente di nuovo, ma riguardo a tali argomenti io conosco il trattato Psicologia dell'omossessualità di Adler. L'ho letto nel 93, quindi ne ho un ricordo vago, ma ricordo che nel testo vi erano delle teorie a proposito di "anomalie" alle strutture cerebrali. Poi anche nel manuale di Canestrari sullo sviluppo c'è qualcosina a proposito. Di più nin zò! Buona ricerca!

[alepegoli]

avevo letto anche io qualcosa riguardo al tema perchè mi interessa molto l'omosessualità però ho letto un sacco di smentite scientifiche sul discorso geni, mi ricordo che la smentita è venuta da diversi casi di gemelli che avendo lo stesso DNA hanno sviluppato diversi orientamenti sessuali... cmq se ci fosse qualcosa di scientifo al riguardo l'arcigay l'avrebbe gia fatto mettere nella costituzione italiana eheh

[elechtra2000]

salve.qualcuno di voi sa come posso scaricare gratuitamente degli articoli scientifici che si trovano nel sito del "Journal of sexual medicine"?grazie