kraftiekortie wrote:
Fragile X is actually fairly common. It might be the second most common known cause of intellectual disability, next to Down Syndrome. It should be noted that a particular "cause," most of the time, is not found within people with intellectual disability.
Autism is a part of some people with Fragile X; the prevalence of autism with Fragile X has been estimated at between 15 and 60 percent.
There are other genetic disorders which have autism as a symptom. It's not the autism that causes variances in facial structure--it's the other genetic disorder.
I thought I was getting a fact slap down! But then I looked it up and no, I was right and you were wrong. (imagine that in a sing song voice.) I love being right.
"Conservative estimates report that fragile X syndrome affects approximately 1 in 2500-4000 males and 1 in 7000-8000 females. The prevalence of female carrier status has been estimated to be as high as 1 in 130-250 population; the prevalence of male carrier status is estimated to be 1 in 250-800 population."
The discrepancy happens because its relatively common to carry the genetic code for fragile X, but not express the syndrome. So you have the gene but its not actively causing the disorder.
That fragile X is very common among genetic factors in intellectual disability doesn't mean all that much, since very few disorders are confirmed to be genetic. Autism, for example, is suspected to be strongly genetic. But there is no autism gene. Its not seen as a genetic disorder. Its rare as heck to have any clear genetic explanation for intellectual disability. I didn't do an exhaustive search for this one, but they don't take into account trisomy 21 (down syndrome). I'm guessing its a point of grammar, as Down S. is at least as commonly expressed as fragile X, as far as I'm aware. (Maybe there are a larger portion of fragile x-ers who don't need services and therefore wouldn't stand out to me as a special educator?)