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Twins in Biological News

'Freaks' help scientist unravel nature and nurture

... hand-walker. And in Minnesota, conjoined twins Abigail and Brittany Hensel live successfully ... goat to walk upright, or to teach the Hensel twins to coordinate their motions when they swim or ... The Elephant Man, the Bearded Lady, the Siamese twins -- at fairs and circuses. In Elizabethan England ...

Rethinking the genetic theory of inheritance

... by comparing monozygotic (genetically identical) twins to dizygotic (genetically different) twins. A trait or disease is called heritable if monozygotic twins are more similar to each other than dizygotic ... analysis of 100 sets of monozygotic and dizygotic twins in the first study of its kind. Said Dr. ...

Embryo biopsy does not affect early growth and risk of congenital malformations in PGD/PGS babies

... (14.3%). In addition, the researchers excluded twins from the study because of the impact twin ... "Further research on the outcome of PGD and PGS twins compared to ICSI and SC twins is mandatory," concluded Prof Bonduelle. ...

Identical twins not as identical as believed

... Contrary to our previous beliefs, identical twins are not genetically identical. This surprising ... these small genetic differences in identical twins where one of them is sick, we have a way of tying ... These researchers studied 19 pairs of identical twins and found that they indeed had the same DNA but ...

Is political orientation transmitted genetically?

... data from political opinions of more than 12,000 twins in the United States and supplemented it with findings from twins in Australia. Alford found that identical twins were more likely to agree on political issues ...

The effect of parental education on the heritability of children's reading disability

... of parental education. In this study, 545 pairs of identical and fraternal twins were selected wherein at least one of the twins in each pair had a reading disability. In addition, the researchers ...

MU researcher identifies possible genetic causes of borderline personality disorder

... In an ongoing study of the health and lifestyles of families with twins in the Netherlands, Trull and colleagues examined 711 pairs of siblings ... a previous study, Trull and research colleagues examined data from 5,496 twins in the Netherlands, Belgium and Australia to assess the extent of genetic ...

Why do people vote? Genetic variation in political participation

... the turnout patterns of identical and non-identical twinsincluding 396 twins in Los Angeles County and 806 twins in the National Longitudinal Study of Adolescent Health. Their findings ...

War between the sexes begins before twins' birth, TAU researchers say

... in pediatrics at Tel Aviv Universitys Sackler School of Medicine. Girl twins Lose Their Advantage Compared to premature twin boys, premature twin ... uterus, says Prof. Reichman, citing studies showing that females with male twins may be more masculinized later in life. A Pediatrics commentary on the ...

Asthma link to post-traumatic stress disorder, says Mailman School of Public Health study

... with post-traumatic stress disorder (PTSD) among adults. The study of male twins who were veterans of the Vietnam era suggests that the association between ... the link between asthma and PTSD, the results between these two types of twins would have been different, but we didn't find substantial differences ...

Genetic contributions to human brain morphology and intelligence

... were found to be because of common environmental influences shared by twins from the same family [Carmelli et al., 2002]. These results point to the ... by a single-gene polymorphism Conclusion MRI studies in twins indicate that, given the basic additive genetic model, overall brain ...

NIH expands Human Microbiome Project; funds sequencing centers and disease projects

... between the inflammatory bowel disease, Crohn's disease, the intestinal microbiome, and bacterial proteins will be explored in samples from pairs of twins with and without the disease. Ellen Li, M.D., Ph.D., Washington University School of Medicine, Saint Louis Digestive tract: Crohn's Disease ...

A genetic link to premature ejaculation

... study suggests that it might be a genetic disorder. Researchers from Turku, Finland, interviewed more than three thousand men - all pairs of male twins and their older or younger brothers - about the first time they had sex. Many participants in the study reported that they had suffered from erectile ...

Identification of genetic variants affecting age at menopause could help improve fertility treatment

... between 40 and 60 year of age, with an average at around 50. The reasons for this variation are unknown, but there is evidence from studies of twins that this could be due to inheritable genetic factors. However, until now, GWAS had not been used to study the effect of genetic variants on age at ...

Bone deformities linked to inbreeding in Isle Royale wolves

... this winter, although calf numbers were low, "so the wolves probably didn't save any for the winter," said Vucetich. In fact, a pair of moose calf twins both survived, a rare occurrence. Genetic Rescue? "What we learned raises the question of whether the wolves of Isle Royale should be ...

Brain background to body mass

... suggest that the picture for common obesity is very similar: many or most genes associated with increased BMI are active in the brain." Studies in twins suggest that genetics can account for 40-70% of the variation in BMI. Yet only one of the genes that were previously discovered had been thought to ...

Gene associated with pair-bonding in animals has similar effects in human males

... interviewed 2,186 adults taking part in the Twin and Offspring Study in Sweden (TOSS). The TOSS study collected detailed information from pairs of twins and their partners or spouses about their marital relationships, personality and mental health, as well as genetic data. They report in this ...

Protein marker for schizophrenia risk

... diagnosis, which means that higher levels of alpha defensins were not caused by medication or progression of the disease. Because both discordant twins had elevated alpha defensins, these proteins do not indicate disease onset, but the researchers suggest they could be a useful and simple marker for ...

Political participation is partially rooted in genetic inheritance

... show clearly that identical twins, who share 100 per cent of their genes, are significantly more similar in their voting behavior than fraternal twins who share only 50 per cent of their genes on average. The results indicate that 53 per cent of the variation in voter turnout is due to differences ...

Genes and environment interact in first graders to predict physical but not social aggression

... approximately 400 pairs of 7-year-old twins, each of whom was asked to list up to three friends in their classroom. Teachers and peers evaluated the twins and their friends levels of social and physical aggression. The researchers found that friends physical aggression interacts with genetic ...

Genes influence age-related hearing loss

... Waltham, MAA new Brandeis University study of twins shows that genes play a significant role in the level of hearing loss that often appears in late middle age. The research, in the Journal of ...

Breastfeeding boost IQ in infants with 'helpful' genetic variant

... and are involved in neuronal growth and regeneration. The study included 1,037 children in New Zealand and 1,116 families with same sex twins in England and Wales. Those who were breastfed and had the genetic variant FADS2 had IQs that were 5.6 to 6.3 points higher than children who were ...

Chronic fatigue syndrome impairs a person's slow wave activity during sleep

... of Michigan, focused on 13 pairs of identical twins discordant for CFS. Analyses, which were ... did not differ between the CFS and healthy twins during a regular night's sleep. According to ... them awake an extra four hours) that the CFS twins exhibited significantly less SWA power in the ...

Study finds that a woman's chances of having twins can be modified by diet

... since older women are more likely to have twins even without ART. "The continuing increase in ... and vegan diet, he found that the vegan women had twins at only one-fifth the rate of women who commonly ... for the first time that the chance of having twins is affected by both heredity and environment, or ...

Nutrition a major factor in rise in twin pregnancies

... culprit in the steady increase in the numbers of twins born over the past thirty years was challenged by ... ?where two embryos are involved and half the twins will be of different sex - was relatively ... all are of like sex), the excess rate of same-sex twins among natural conceptions has risen steadily for ...

How can identical twins be genetically different?

... find it impossible to tell them apart. Identical twins who grow up together share just about everything, ... the expression patterns varied between identical twins where only one twin had RA. Results of the U-M ... developing RA, yet only 15 percent of identical twins will both develop it. Scientists compared ...

Genes affecting blood pressure change as children become adults

... study of black and white identical and fraternal twins showed that changes in gene expression between ... part of the individual differences between the twins were due to new genetic effects between this ... believed ?and some previous studies in adult twins have shown ?that the genes are consistent over a ...

UCLA scientists discover immune response to HIV differs, even in identical twins

... the immune systems in two HIV-positive identical twins responded to the infection in different ways. ... The researchers followed the cases of male twins who were infected shortly after their 1983 births ... Infected with the same strain of the virus, the twins continue to live in the Los Angeles area and grew ...

Scientists find evidence of catastrophic sand avalanches, sea level changes in Gulf of Mexico

... Identical twins lose some fundamental similarities as they grow ... changes are normal and may explain why pairs of twins lose some of their identical attributes as they ... Madrid . The researchers studied 40 pairs of twins recruited in Spain , Denmark and the United ...

Identical twins may have more differences than meet the eye

... Identical twins lose some fundamental similarities as they grow ... changes are normal and may explain why pairs of twins lose some of their identical attributes as they ... Madrid . The researchers studied 40 pairs of twins recruited in Spain , Denmark and the United ...

Twin studies reveal genetic components leading to cardiac and kidney disease

... together unexpected stories," he said. Studying genetic variations in twins provides scientists with data on traits that are heritable, or passed down ... are determined in part by particular genes. "Behavioral studies with twins have been conducted for decades, but in the post-genomic era, we can now ...

Stanford-led study closes in on genes that may predispose some people to severe depression

... studies on the genetics of depression." Researchers learned that depression is influenced by genetics by studying patterns of depression in twins and families. No single gene is thought responsible for determining the risk for developing depression. Instead, multiple genes are probably ...

Good behavior, religiousness may be genetic

... course, no specific gene for religiousness, but individuals do have biological predispositions to behave in certain ways," says Koenig. "The use of twins in the current study allowed for an investigation of the genetic and environmental influences on this type of behavior." This research is ...

The penalty of having a sister -- why sibling sex matters for male saiga antelopes

... Having a twin sister could put male saiga antelopes at a reproductive disadvantage, says new research published today. The study shows that male twins with a sister are born lighter than those with a brother, making them smaller than the optimal size for males. The research also shows that saigas ...

Heavy smoking cuts women's chance of pregnancy -- even with donated oocytes

... much lower in heavy smokers, for those that did become pregnant the multiple pregnancy rate was much higher, with 60% of the heavy smokers expecting twins against 31% of the non-heavy smokers. "This is counter-intuitive," said Dr Soares, "and although we controlled for all known interfering ...

When nerve cells can't make contact

... in small children has no scientific basis at all. Today, it is clear that genetic factors are the major cause of the illness. Studies of identical twins have been particularly convincing in demonstrating this fact - the probability that the identical twin of an autistic person will also be autistic ...

U of M study examines kidney stone prevention in astronauts

... risk for developing kidney stones is genetic. The study participants had no history of kidney stones and were placed on standardized diets. The twins were put on bed rest on a tilted bed that positioned their head lower than their feet to simulate low gravity for 30 days. One twin per pair was ...

Alzheimer's found to be mostly genetic

... only a 45 percent concordance rate for identical male pairs. This means that of all pairs where one twin has Alzheimer's, 55 percent of the healthy twins either will never get the disease or will develop it later in life. In her previous research with twins, Gatz identified possible preventive or ...

Phenotype is influenced by nature, nurture and noise

... an analysis of such fine details of gene regulation explains not only the observed variability of cells, but also, in a larger sense, why identical twins don't necessarily have identical fingerprints," said Hasty. "Given that every potential feature of an organism is ultimately determined at the ...
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