In search of autism genes: a needle in a haystack

Given that autism is a diagnosis based solely on specific behavioral criteria [as there are no imaging studies and / or laboratory with diagnostic significance] is not a disease of the psyche, but the brain [encephalopathy], who, like everyone other organs, has its fundamental roots in the expression of the genetic heritage contained in the cells, the conclusion is that, as well as a genetic alteration in the load HLA may increase the risk of getting a particular disease, there must be one or more alterations genetic charged to the DNA of neurons, making them responsible for the onset of autism or other psychiatric illnesses.

A simple and strong reasoning, at first sight, exercising a accativante appeal to the mass media.

In 2004, for example, the mass media have given ample space to a search [ I cite this as an example of a widespread tendency bad ] which shows the genetic origin of the depression so-called \”major\” as a risk factor for suicide. In fact, the study, coordinated by George S. Zubenko [neurobiologist at the University of Pittsburgh in Pennsylvania] shows that people who get into multiple and severe depressive episodes, at a young age [under 25], they have, as they say a familiarity particularly strong, in that it is common to find the father or mother, or brothers or sisters of these young depressed, in turn suffering of some mood disorder.

In this study, which covered 81 families of people with depression classified \” recurrent and early onset \”, about half of first-degree relatives suffered from depression or anxiety. This percentage is reduced to a quarter in the case of second-degree relatives [cousins, uncles, nephews]. This shows the genetic origin of the depression? … It \’was perhaps found the gene [or genes] of depression, which is transmitted from genitorie to son? … Of course not!