genetics   20517

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A Precocious Puberty Case: I Went Through Puberty at Age 2
With a rare case of extremely precocious puberty, called familial male-limited precocious puberty, Patrick Burleigh was a 4-year-old trapped in a teenager’s body. “I was all of the things people are when they’re 14 or 15” — except a decade younger.
health  medicine  genetics  sceience  parenting 
1 hour ago by bradbarrish
Twins get some 'mystifying' results when they put 5 ancestry DNA kits to the test | CBC News
A simple test with identical twins shows that the ancestry information that genetic testing services provide, is pretty much entirely bullshit.
science  genetics  via:HackerNews 
9 hours ago by mcherm
Longevity defined as top 10% survivors and beyond is transmitted as a quantitative genetic trait
> Survival to extreme ages clusters within families. However, identifying genetic loci conferring longevity and low morbidity in such longevous families is challenging. There is debate concerning the survival percentile that best isolates the genetic component in longevity. Here, we use three-generational mortality data from two large datasets, UPDB (US) and LINKS (Netherlands). We study 20,360 unselected families containing index persons, their parents, siblings, spouses, and children, comprising 314,819 individuals. Our analyses provide strong evidence that longevity is transmitted as a quantitative genetic trait among survivors up to the top 10% of their birth cohort. We subsequently show a survival advantage, mounting to 31%, for individuals with top 10% surviving first and second-degree relatives in both databases and across generations, even in the presence of non-longevous parents. To guide future genetic studies, we suggest to base case selection on top 10% survivors of their birth cohort with equally long-lived family members.
aging  longevity  genetics 
2 days ago by porejide
Strongest opponents of GM foods know the least but think they know the most | Environment | The Guardian
Analysis of surveys from US, France and Germany could also have implications for science communication in other fields
food  genetics 
2 days ago by geetarista
Strongest opponents of GM foods know the least but think they know the most • The Guardian
Ian Sample:
<p>The most extreme opponents of genetically modified foods know the least about science but believe they know the most, researchers have found.

The findings from public surveys in the US, France and Germany suggest that rather than being a barrier to the possession of strongly held views, ignorance of the matter at hand might better be described as a fuel.

“This is part and parcel of the psychology of extremism,” said Philip Fernbach, a researcher at the University of Colorado and co-author of the 2017 book The Knowledge Illusion. “To maintain these strong counter-scientific consensus views, you kind of have to have a lack of knowledge.”

Fernbach and others analysed surveys completed by nationally representative samples of the US, French and German public. Those who took part were asked about their attitudes to GM foods and given instructions on how to judge their understanding of the topic. Next, they completed a scientific literacy test. Among the statements the participants had to wrestle with were: “Ordinary tomatoes do not have genes, whereas genetically modified tomatoes do” (false), and “the oxygen we breathe comes from plants” (true).

The results from more than 2,500 respondents revealed the curious trend. “What we found is that as the extremity of opposition increased, objective knowledge went down, but self-assessed knowledge went up,” Fernbach said.</p>


When I was writing a lot about GM foods, about 20 years ago, it was noticeable that many of the arguments against them came from emotion. (There are some legitimate arguments against GM, around intellectual property on seeds.) But I suspect this result could be generalised; it's something of a <a href="https://en.wikipedia.org/wiki/Dunning–Kruger_effect">Dunning-Kruger</a> corollary.
genetics  gm  food  science 
3 days ago by charlesarthur

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