Testosterone-fuelled infantile males might be a product of Mom's behaviour
By comparing the testosterone levels of five-month old pairs of twins, both identical and non-identical, University of Montreal researchers were able to establish that testosterone levels in infancy are not inherited genetically but rather determined by environmental factors.
"Testosterone is a key hormone for the development of male reproductive organs, and it is also associated with behavioural traits, such as sexual behaviour and aggression," said lead author Dr. Richard E. Tremblay of the university's Research Unit on Children's Psychosocial Maladjustment. "Our study is the largest to be undertaken with newborns, and our results contrast with the findings gained by scientists working with adolescents and adults, indicating that testosterone levels are inherited." The findings were presented in an article published in Psychoneuroendocrinology on May 7, 2012.
The researchers took saliva samples from 314 pairs of twins and measured the levels of testosterone. They then compared the similarity in testosterone levels between identical and fraternal twins to determine the contribution of genetic and environmental factors. Results indicated that differences in levels of testosterone were due mainly to environmental factors. "The study was not designed to specifically identify these environmental factors which could include a variety of environmental conditions, such as maternal diet, maternal smoking, breastfeeding and parent-child interactions."
"Because our study suggests that testosterone levels in infants are determined by the circumstances in which the child develops before and after birth, further studies will be needed to find out exactly what these influencing factors are and to what extent they change from birth to puberty," Tremblay said.
More information: The article Genetic and environmental contributions to saliva testosterone levels in male and female infant twins was published in an advanced, online edition of Psychoneuroendocrinology on May 7, 2012, by Dr. Richard E Tremblay of the University of Montreal's Research Unit on Children's Psychosocial Maladjustment.
Provided by University of Montreal
- Prenatal testosterone linked to increased risk of language delay for male infants, study shows Jan 26, 2012 | not rated yet | 0
- Testosterone and body fat are controlled by the same genes Aug 05, 2008 | not rated yet | 0
- Men's testosterone levels predict competitiveness Dec 04, 2006 | not rated yet | 0
- High testosterone levels and lower heart risks tied together Oct 06, 2011 | not rated yet | 0
- High testosterone may mean shorter lives Apr 13, 2006 | not rated yet | 0
- Motion perception revisited: High Phi effect challenges established motion perception assumptions Apr 23, 2013 | 3 / 5 (2) | 2
- Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update) Apr 02, 2013 | 4.5 / 5 (11) | 5
- The visual system as economist: Neural resource allocation in visual adaptation Mar 30, 2013 | 5 / 5 (2) | 9
- Separate lives: Neuronal and organismal lifespans decoupled Mar 27, 2013 | 4.9 / 5 (8) | 0
- Sizing things up: The evolutionary neurobiology of scale invariance Feb 28, 2013 | 4.8 / 5 (10) | 14
How can there be villous adenoma in colon, if there are no villi there
3 hours ago As title suggest. Thanks :smile:
How can there be a term called "intestinal metaplasia" of stomach
May 21, 2013 Hello everyone, Ok Stomach's normal epithelium is simple columnar, now in intestinal type of adenocarcinoma of stomach it undergoes "intestinal...
Pressure-volume curve: Elastic Recoil Pressure don't make sense
May 18, 2013 From pressure-volume curve of the lung and chest wall (attached photo), I don't understand why would the elastic recoil pressure of the lung is...
If you became brain-dead, would you want them to pull the plug?
May 17, 2013 I'd want the rest of me to stay alive. Sure it's a lousy way to live but it beats being all-the-way dead. Maybe if I make it 20 years they'll...
MRI bill question
May 15, 2013 Dear PFers, The hospital gave us a $12k bill for one MRI (head with contrast). The people I talked to at the hospital tell me that they do not...
Ratio of Hydrogen of Oxygen in Dessicated Animal Protein
May 13, 2013 As an experiment, for the past few months I've been consuming at least one portion of Jell-O or unflavored Knox gelatin per day. I'm 64, in very...
- More from Physics Forums - Medical Sciences
More news stories
(Medical Xpress)—Preschoolers universally recognize that one's choices are not always free – that our decisions may be constrained by social obligations to be nice to others or follow rules set by parents ...
Psychology & Psychiatry 2 hours ago | not rated yet | 0
(Medical Xpress)—Do ethicists engage in better moral behavior than other professors? The answer is no. Nor are they more likely than nonethicists to act according to values they espouse, according to researchers from the ...
Psychology & Psychiatry 2 hours ago | 5 / 5 (1) | 0
Is it permissible to harm one to save many? Those who tend to say "yes" when faced with this classic dilemma are likely to be deficient in a specific kind of empathy, according to a report published in the scientific journal ...
Psychology & Psychiatry 5 hours ago | not rated yet | 0 |
(HealthDay)—The monstrous tornado that devastated Moore, Okla., on Monday, killing dozens of adults and children, is a stunning example of violent weather that can affect a child's mental well-being.
Psychology & Psychiatry 18 hours ago | not rated yet | 0
Youth who had a schoolmate die by suicide are significantly more likely to consider or attempt suicide, according to a study in published in CMAJ (Canadian Medical Association Journal). This effect can last 2 years or mo ...
Psychology & Psychiatry 22 hours ago | not rated yet | 0
Research presented today shows that high-fructose corn syrup can cause behavioural reactions in rats similar to those produced by drugs of abuse such as cocaine. These results, presented by addiction expert Francesco Leri, ...
46 minutes ago | not rated yet | 0
On May 22, JoVE will publish details of a technique to measure the health of human genetic material in relation to a patient's age. The method is demonstrated by the laboratory of Dr. Gil Atzmon at New York's Albert Einste ...
45 minutes ago | not rated yet | 0
New research shows that craving drugs such as nicotine can be visualized in specific regions of the brain that are implicated in determining the value of actions, in planning actions and in motivation. Dr. Alain Dagher, from ...
45 minutes ago | not rated yet | 0
(Medical Xpress)—Scientists supported by the National Institutes of Health have a new theory as to why a woman's fertility declines after her mid-30s. They also suggest an approach that might help slow ...
2 hours ago | not rated yet | 0 |
(Medical Xpress)—Health care spending is much higher for older Americans than for younger adults and children, on average, and analysts have said that increasing spending leads to longer life expectancy.
1 hour ago | not rated yet | 0
Medical researchers discover new ways to target, develop and design drugs to prevent and treat viral infection
Researchers at the University of Alberta have discovered a new drug target, developed a new drug and identified a new way to design drugs—all of which could be a winning combination in the battle against viruses.
2 hours ago | 4 / 5 (1) | 0 |