Fragile X Syndrome video
new gene linked to fragile x syndrome discovered
New Gene Linked To Fragile X Syndrome -- Suggests Potential Targets For Autism And Other Neurological Disorders
ScienceDaily (2008) — Scientists at The Scripps Research Institute have discovered a new gene involved in fragile X syndrome, a condition that often shares many symptoms of autism. The discovery may lead to new tests or treatments for several neurological disorders. click here to read full article at sciencedaily
ScienceDaily (2008) — Scientists at The Scripps Research Institute have discovered a new gene involved in fragile X syndrome, a condition that often shares many symptoms of autism. The discovery may lead to new tests or treatments for several neurological disorders. click here to read full article at sciencedaily
genetic disease and fragile x syndrome
Fragile x syndrome is caused alteration of the FMR1 gene located on chromosome X.
Males have one X chromosome and one Y, in women has two copies of chromosome X, the disease occurs only when both copies of the gene is altered , in women homozygous recessive. Women who have a healthy gene on one X and one altered on X are called heterozygous not develop symptoms and are healthy carriers, because they can still transmit the mutation to their children. The name of the disease stems from the fact that the X chromosome has a characteristic shrinkage.
Males have one X chromosome and one Y, in women has two copies of chromosome X, the disease occurs only when both copies of the gene is altered , in women homozygous recessive. Women who have a healthy gene on one X and one altered on X are called heterozygous not develop symptoms and are healthy carriers, because they can still transmit the mutation to their children. The name of the disease stems from the fact that the X chromosome has a characteristic shrinkage.
fragile x syndrome genetic disease
Fragile X syndrome genetic disease characterized by mental retardation in a more or less serious delays in the development of language and behavior disorders. With an incidence of 1 in 1200 males and 1 in 2000 females, is the most frequent cause of mental retardation after Down syndrome.
human genetic diseases caused by mutations
Fragile X syndrome (or syndrome Martin Bell) is a human genetic disease caused by mutation of the FMR1 gene on the X chromosome, this mutation in a male over in 4000 and a female at 6000. About 1 in 256 women are carriers of Fragile-X and can transmit it to their children. About 1 in 800 males are carriers of Fragile-X; their daughters will, in turn, carry the gene. It accounts with Down syndrome primacy as the most common genetic cause of mental retardation.
Normally, the FMR1 gene contains between 6 and 53 repeats of CGG codon (repetition of trinucleotidi). In individuals suffering from Fragile X syndrome, the FMR1 allele has more than 230 repetizioni of this codon. This level of expansion causes the methylation of cytosine in the promoter of the FMR1 gene, thus silencing the expression of the FMR1 gene. The methylation of the locus FMR1, which is located on chromosome band Xq27.3, causing at that point, the constriction and the fragility of the X chromosome, a phenomenon that gives its name to the syndrome.
Males with a FMR1 gene with a significant expansion of the CGG triplet with the symptoms of the disease, since you normally have only one copy of chromosome X. Females, by contrast, have two copies of chromosome X and therefore have a chance to own at least twice a functional allele. The women with an expanded FMR1 gene on one of the two X chromosomes may show some symptoms of the disease or be normal (Figure right on all'ereditarietà linked recessive X chromosome does not correspond exactly to the case of Fragile X syndrome , But it exemplifies the situation).
Apart from the mental retardation of varying degrees from moderate to severe, other obvious features of the syndrome are elongated face, large ears, large testicles (macrorchidismo), and low muscle tone. Behavioral characteristics may include stereotypical movements (for example, beat their hands) and atypical social development, particularly shyness and limited eye contact situations. Some individuals suffering from Fragile X syndrome are also in the diagnostic criteria of autism.
The mutation and methylation of the FMR1 gene leads to the abolition of production of the protein for which the FMR1 gene encoding, that FMRP (fragile-X mental retardation protein). FMRP is a protein binding to RNA (RNA-binding protein) expressed mainly in the testicles and brain tissues most affected by the syndrome. FMRP RNA is associated with major messengers coding neural protein, and regulates some essential aspects, such as transportation along the dendriti to the synapses and the translation into proteins. In the absence of FMRP, many of the target RNA messengers of the protein are more deregulated and are translated into protein. There are also new molecular functions of protein, such as adjusting the stability of messenger RNA.
Although there is still no cure for the syndrome, there is hope that a better understanding of its causes may lead to new therapies. Currently, the syndrome can be treated through behavioral therapy, special education, and when necessary, treatment of physical abnormalities. We advise people who have relatives suffering from Fragile X syndrome to contact the geneticists to assess the probability of having sick children, and to know the seriousness of the problems that may have affected the descendants of the syndrome.
Normally, the FMR1 gene contains between 6 and 53 repeats of CGG codon (repetition of trinucleotidi). In individuals suffering from Fragile X syndrome, the FMR1 allele has more than 230 repetizioni of this codon. This level of expansion causes the methylation of cytosine in the promoter of the FMR1 gene, thus silencing the expression of the FMR1 gene. The methylation of the locus FMR1, which is located on chromosome band Xq27.3, causing at that point, the constriction and the fragility of the X chromosome, a phenomenon that gives its name to the syndrome.
Males with a FMR1 gene with a significant expansion of the CGG triplet with the symptoms of the disease, since you normally have only one copy of chromosome X. Females, by contrast, have two copies of chromosome X and therefore have a chance to own at least twice a functional allele. The women with an expanded FMR1 gene on one of the two X chromosomes may show some symptoms of the disease or be normal (Figure right on all'ereditarietà linked recessive X chromosome does not correspond exactly to the case of Fragile X syndrome , But it exemplifies the situation).
Apart from the mental retardation of varying degrees from moderate to severe, other obvious features of the syndrome are elongated face, large ears, large testicles (macrorchidismo), and low muscle tone. Behavioral characteristics may include stereotypical movements (for example, beat their hands) and atypical social development, particularly shyness and limited eye contact situations. Some individuals suffering from Fragile X syndrome are also in the diagnostic criteria of autism.
The mutation and methylation of the FMR1 gene leads to the abolition of production of the protein for which the FMR1 gene encoding, that FMRP (fragile-X mental retardation protein). FMRP is a protein binding to RNA (RNA-binding protein) expressed mainly in the testicles and brain tissues most affected by the syndrome. FMRP RNA is associated with major messengers coding neural protein, and regulates some essential aspects, such as transportation along the dendriti to the synapses and the translation into proteins. In the absence of FMRP, many of the target RNA messengers of the protein are more deregulated and are translated into protein. There are also new molecular functions of protein, such as adjusting the stability of messenger RNA.
Although there is still no cure for the syndrome, there is hope that a better understanding of its causes may lead to new therapies. Currently, the syndrome can be treated through behavioral therapy, special education, and when necessary, treatment of physical abnormalities. We advise people who have relatives suffering from Fragile X syndrome to contact the geneticists to assess the probability of having sick children, and to know the seriousness of the problems that may have affected the descendants of the syndrome.
Fragile X syndrome
The fragile X syndrome is a syndrome is the leading cause of inherited mental retardation (second leading cause of mental retardation of genetic origin after trisomy 21)
6% of children with learning disorders are carriers of this syndrome. The disease does not malformation and children affected by the disease have normal growth.
The disease manifests itself mainly in boys mainly by delays in mental and behavioural disorders various up autism. The girls affected by this disease have a delay intellectual means.
The disease reached 12 000 people in France.
6% of children with learning disorders are carriers of this syndrome. The disease does not malformation and children affected by the disease have normal growth.
The disease manifests itself mainly in boys mainly by delays in mental and behavioural disorders various up autism. The girls affected by this disease have a delay intellectual means.
The disease reached 12 000 people in France.
Fragile X
Fragile x syndrome is a genetical disease. This blog about fragile x syndrome, and fragile pictures, fragile images, fragile videos, fragile x syndromes, fragile x medias, fragile x visual, fragile x disease, fragile x patients, fragile x cure, fragile x girls, fragile x syndrome boys
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