Word: cystic
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That can't be the whole answer, of course, since plenty of Americans take showers without getting sick. Studies show that nearly half of NTM patients are also genetically predisposed to lung infections. Some have inherited one of the genes for cystic fibrosis. Others have a defective alpha-1 anti-trypsin gene, a condition that has been linked to a high risk of emphysema. Perhaps it is a combination of bad genes and bad luck that is making people sick...
...genes that set the stage for autistic disorders could derail developing brains in a number of ways. They could encode harmful mutations like those responsible for single-gene disorders--cystic fibrosis, for instance, or Huntington's disease. They could equally well be garden-variety variants of normal genes that cause problems only when they combine with certain other genes. Or they could be genes that set up vulnerabilities to any number of stresses encountered by a child...
Even if you could identify the genes involved in Asperger's, it's not clear what you would do about them. It's not as if they are lethal genetic defects, like the ones that cause Huntington's disease or cystic fibrosis. "Let's say that a decade from now we know all the genes for autism," suggests Bryna Siegel, a psychologist at the University of California, San Francisco. "And let's say your unborn child has four of these genes. We may be able to tell you that 80% of the people with those four genes will be fully...
...cousin marriages in all states. It is highly hypocritical for the government to deny marriage to these couples when they allow those with even more easily transferable conditions to marry. A child whose parents each have a single gene for a recessive disease such as sickle cell anemia or cystic fibrosis has a 25 percent chance of actually contracting the disease, yet the government does not restrict their marital choices. Even more damning is the case of dominant genetic diseases like Huntington’s disease, where if even a single parent has the disease, the child...
That view may have to change. A comprehensive study published last week in the Journal of Genetic Counseling indicates such children run an only slightly higher risk of significant genetic disorders like cystic fibrosis or congenital heart defects--about two percentage points above the average 3% to 4%. Says the study's lead author, Robin Bennett, president-elect of the National Society of Genetic Counselors, which funded the study: "Aside from a thorough medical family history, there is no need to offer any genetic testing on the basis of consanguinity alone...