The Causes and Effects of Down Syndrome

As shown, Down syndrome, also known as trisomy 21, occurs when a child is born on chromosome 21. This can be caused by three different processes, no separation, mosaic, or translocation. After the oocyte and sperm are bound, unbound from 46 to 23 occurs during chromosome ablation, and the parent passes through 24 instead of 23. For Down's syndrome, the extra chromosome is chromosome 21. Mosaic is a rare occurrence that occurs "about 1% to 2% of cases of Down's syndrome" (Johnson, 2013).

Most cases of Down's syndrome are caused by trisomy 21. Occasionally, extra chromosome 21 or part thereof is connected to another chromosome of ovum or sperm; this may lead to "translocation down syndrome". This is the only form of Down's syndrome that can be inherited from parents. The # 21 chromosome is bound to other chromosomes but it does not affect its health, the reorganization of some of the parents is called balanced translocation. In rare cases, if cell division occurs after fertilization, another form called "mixed type Down syndrome" may appear. Among these individuals, there is an extra chromosome # 21 (a total of 47 chromosomes), and other cells have a normal number (a total of 46 chromosomes).

What is the cause of Down's syndrome? Down syndrome is usually caused by a cell division abnormality called non-segregation. However, two other types of chromosomal aberrations, mosaics and translocations are also associated with Down's syndrome. Regardless of the type of down syndrome in humans, all people with Down's syndrome have chromosome 21 added to all or part of the cells. This additional genetic material alters the developmental process and leads to syndrome-related features.

Down syndrome is a hereditary disorder caused by trisomy of human chromosome 21. Down syndrome is a common chromosomal abnormality in human mental retardation. It is caused by three types of chromosomal abnormalities, free trisomy 21, translocation Down syndrome and mosaic down syndrome. Most patients with Down's syndrome experience neuropathology like Alzheimer's disease, such as dementia, neurofibrillary tangles. Genes containing SOD-1, DSCR1, APP gene and S100B on chromosome 21 are deeply involved in the relationship between Down's syndrome and Alzheimer's disease. In addition to the genes involved, other factors such as oxidative stress and hormones are also described in this review.

Many people with Down's syndrome develop Alzheimer's disease. The symptoms and signs of Alzheimer's disease often appear 10 to 20 years earlier than people with Down's syndrome. Genes contained in extra chromosomes that cause Down's syndrome markedly increase the risk of Alzheimer's disease. These risk factors are also associated with vascular dementia, which is a type of dementia caused by damaged blood vessels in the brain. Cooperating with your medical team to plan to manage these factors will help protect your heart - and may also help reduce the risk of Alzheimer's disease and vascular dementia Hmm