Duane's Syndrome Essay

This syndrome is tested at birth with fluorescent in situ hybridization or FISH. With blood samples, they test the blood for the deletion of chromosome 7. FISH checks if many as of 22-26 genes are deleted. Because there is no cure for this syndrome, you will most likely have physical therapy and early education to help early development symptoms like speech delays and heart problems. This syndrome is not caused by environmental factors, it is completely genetic and NOT the parents fault.

INTRODUCTION. Idiopathic congenital nystagmus, or idiopathic infantile nystagmus is a disease characterized by the rapid, involuntary eye movement. This movement is typically in the horizontal direction, however, movement in other directions have been observed. One way to get nystagmus is through genetic mutations. Nystagmus caused by genetic mutation is seen at a relatively young age but cannot yet be treated. The disease is not understood well, it is believed that the cause is a developmental defect. The linkage, and inheritance has not been identified, the patterns suggest that multiple genes are involved in the disease and that there are loci on different chromosomes with three of the five loci located on the X chromosome. Mutations have been linked to the FRMD7 gene, a gene that consists of 12 exons, of the FERM family. The function of FRMD7 have yet to be determined however an abundance of the protein in the brain in areas associated with the eye. Mutations within this region consist of missense, deletion, tranversion and nonsense mutations. Over forty-four mutations that lead to ICN have been found in the FRMD7 gene. Learning more about the mutation of FRMD7 in ICN is important because these mutations may prevent elongation of neurite processes during differentiation preventing axons from responding to stimuli (Watkins et al. 2012).

Autosomal recessive inheritance is the third type known to cause muscular dystrophy, whereas both parents are carriers of the defective gene. For this reason the offspring have a 25% chance of being affected with both malformed genes, resulting in them being affected. The chance increases with cousin marriages.

This syndrome is not very common, because it is a rare condition. Its prevalence is not certain, but the proximate amount is 5 to 10 individuals per million newborns. Research workers appraise that there are approximately 200 to 300 individuals around the world who have this disorder. It is observed with equivalent recurrence in both males and females over all ethnic groups.

This syndrome is from a mutation of a gene on chromosome 15 and this causes problems in the production of fibrillin-1 which is a protein that is an important part of connective tissue. The name for the gene is FBN1. Basically, it is the “glue” that helps to support the tissues in the human body. A child born to a parent with this syndrome has a 50% of having it. However, in the remaining 25%, neither parent has the disease which gives them a 1 in 10,000 chance of having a child with this disorder. When a child of two unaffected parents is born with it then the genetic mutation occurs in either the egg or sperm cell at the time of conception.

Trisomy 13 is a very terrible disease to have. The disease causes many deformities. You would have a very deformed body. The disease happens when there is a third thirteenth chromosome. Instead of the normal two, there would be three. The symptoms are heart, brain, spinal cord, and bone abnormalities, also a hole in the iris lip and pallet. Along with those are small head, eyes, and lower jaw, then there is close-set eyes that can fuse into one and low-set ears.

Source http://www.epilepsy.com/learn/types-epilepsy-syndromes/dravet-syndrome The majority of Dravet mutations are not inherited from either parent, as is the case with Jayden whose parents do not carry the gene that causes Dravet syndrome. It is common for patients with this condition to exhibit cognitive impairment, behavioral disorders, and motor

Emery-Dreifuss muscular dystrophy (EDMD) is a rare form of muscular dystrophy. It is another one that only affects boys that appears from childhood to the early teen years and sometimes as late as the age of twenty five. It causes muscles weakness and wasting in the shoulders, upper arms, shins, and often causes problems with the joints becoming tighter. Life threatening heart problems are common and can also affect those who do not have this disease, but simply carry the genes for it. This is a slow progressing disease and often has slow progressing muscle weakness compared to other forms of muscular dystrophy.

This disease is inherited from parents, and it is dominant, meaning only one copy of the gene is needed to develop this disorder. It is extremely rare and it affects less than 0.01% of people of European ancestry. See figure 2 for heredity patterns.

Genetic disorders come in various forms. Some can be caused by mutations of the genes or chromosomes while others can be caused by a process called nondisjunction. Nondisjunction occurs when chromosomes during meiosis do not separate correctly and the daughter cells receive too much or too little genetic information. Klinefelter's is caused by nondisjunction which results in an extra X chromosome being present in a male.

                 Rett syndrome, including the age of onset and the severity of symptoms, varies from child to child. Before the symptoms begin, however, the child generally appears to grow and develop normally, although there are often subtle abnormalities even in early infancy, such as loss of muscle tone (hypotonia), difficulty feeding, and jerkiness in limb movements. Then, gradually, mental and physical symptoms appear. As the syndrome progresses, the child loses purposeful use of her hands and the ability to speak (Rett Syndrome, 2010). Other early symptoms may include problems crawling or walking and diminished eye contact (Rett Syndrome, 2010). The onset of a period of regression is sometimes sudden.  Apraxia — the inability to perform motor functions — is perhaps the most severely disabling feature of Rett syndrome, interfering with every body movement, including eye gaze

The disease may be found on a chromosome analysis. There is no said or found cure or treatment for the disease. It’s very rare, but not impossible, to get the disease from parents or grandparents.

The human brain is utterly baffling. A small organ weighing merely three pounds as an adult has the ability to control and shape a human’s life. Without it there would be nothing. There are so many different functions… and with that there are so many things that can go horribly wrong. It is amazing the capacities and that it possesses and we do not even realize it. That is why studying neurology and working on the treatment of neurological disorders is so critically important. Through the examination of Huntington’s disease, Bell’s Palsy, and Aphasia, neurologists can work to better the human mind and cure the diseases that attack it, which will infinitely enhance the lives of humans and create a brighter future for us all.

scoliosis, cataracts , scars, overweight, Chrohn diseasChromosome Patterns The normal female has 46 chromosomes, of

The gene carrying the defect that produces albinism is recessive, which means that both parents must carry this recessive gene in order to produce a child with the condition. When both parents carry the gene (and neither has albinism), there is a one in four chance with each pregnancy that their child will have albinism. The inheritance pattern of ocular albinism is alittle different. This condition is X-linked, meaning that the recessive gene for ocular albinism is located on the X chromosome. X-linked ocular albinism appears just about only in males who inherit the condition from their mothers.