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Influences of genetics on human development
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Introduction
Turner Syndrome is a genetic disorder that is characterized by the absence of part or all of the second X chromosome in women. Women who have Turner Syndrome typically have short stature, sexual infantilism, congenital webbing of the neck, and cubitus valgus, which is when the forearm is angled away from the body at a greater degree than normal. A number of health issues accompany the absence of this X chromosome, indicating that a large number of specialists are needed in order to properly treat this disease. These specialists include embryology, pediatrics, gynecology and obstetrics, endocrinology, cardiology, gastroenterology, otorhinology, and ophthalmology (Gravholt, 2005).
This absence of part or all of the second X chromosome means that one important gene known as the SHOX gene is missing. The short stature homeobox (SHOX) gene is located on the pseudoautosomal region of both the X and Y chromosomes. This gene provides the instructions that are necessary for the making of proteins that regulate the functions of other genes. It is also important in controlling the formation of many of the body’s structures during early embryonic development. The SHOX gene is also essential in the growth and development of bones, specifically in the arms and legs Genetics Home Reference. Since one of the X chromosomes is missing, the SHOX gene is insufficient and cannot perform its actions as well as needed. This can explain the short stature of women with Turner Syndrome as well as changes in bone morphology, and sensorineural deafness (Gravholt, 2005). The absence of the second X chromosome may also contribute to the autoimmunity from which Turner Syndrome patients suffer (Grossi et al., 2013).
Prevalence/ Diagnosis
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...onal problems, and more. The true prevalence of TS is unknown, but is estimated to be around 50 per 100,000 women.
Hormone replacement therapy is the main treatment option for women with Turner Syndrome. Growth hormone, estrogen, and even progesterone are used in order to help patients cope with the disease. Growth hormone is used to increase the height of women as well as help BMI, cholesterol concentrations, triglycerides, and estrogen and FSH levels. Estrogen and progesterone are used in order to assist patients in developing secondary sex characteristics as well as increase uterine size and maturity.
Unfortunately, there is an increased mortality rate in women with Turner Syndrome. Management of the complications that can accompany TS is the only way to live with the disease. Turner Syndrome cannot be cured, but with proper care and treatment it can be managed.
Tay-Sachs disease is a rare hereditary disease found mainly in infants but is also found in juveniles and adults. It is caused by the abnormal metabolism of fats and is characterized by mental deterioration, blindness, and paralysis. There is no available treatment for this disease.
Twin studies have been used to distinguish between genetic and environmental factors for many disorders in the general population including ectodermal dysplasia, Ellis-van Creveld, and anencephaly. This review focuses on genetic disorders affecting monozygotic, dizygotic, and conjoined twins to gain a better understanding of them. Many studies focus on twins because they have a nearly identical genome, which eliminates environmental factors. In case studies, the concordance rates in monozygotic twins have supported that certain disorders were caused by genetics and not the environment. The discordant values in twins will also be evaluated briefly. Twinning studies have also shown linkages between specific disorders and the genes responsible for them. Knowing the location of these genes allows patients to be treated quickly and efficiently. This paper will discuss the possible causes of twinning and the various methods of identifying abnormalities in twins. These methods also allow preventive measures against the rise of birth defects during prenatal development. Epigenetics in twins is also viewed through the perspective of effects on them. Treatments for genetic disorders in twins are reviewed, ranging from the restoration of malformed teeth to the separation of conjoined twins. Support groups for twins in treatment, and their families are also briefly reviewed.
Achondroplasia (ACH) is the most common form of short-limb dwarfism occuring in 1 in 15,000 to 28,000 births and appears to be slightly more prevalent in females, but indiscriminent toward race (1-3). Evidence has been found in Egypt for cases of ACH dating back as far as 4500 B.C. (4). In simplest terms, ACH is a disease where the dwarfing of bones formed in the cartilage occurs (5). There are many features that accompany this disease including rhizomelic (proximal) shortening of the extremities, megalencephaly (enlarged brain), short stature, trident hand, and frontal bossing (prominent forehead) (1, 3, 4, 6-8). Expression of this gene at high levels is primarily found in cells of the nervous system and the cartilage rudiments and chondrocytes in the growth plates of developing bone (7, 9). Due to the fact that there are numerous types of skeletal dysplasia, some which appear similar to ACH at times, the only way for complete confirmation is to perform molecular techniques such as genetic testing (1, 4, 8).
The Duchenne gene has been located on the short arm of the X chromosome. This means that Duchenne muscular dystrophy is inherited as an X-linked recessive disease. Females have two X chromosomes, while males have one X chromosome and one Y chromosome. Therefore, in females, a normal X...
Because Williams Syndrome is very uncommon within a large crowd among people, the causes that are known to trigger the disorder are very few. The causes or conditions that are known to trigger Williams Syndrome is by the deletion of twenty-six to twenty-eight genes on chromosome #7. Many people may conclude that just because Williams Syndrome is a “genetic” disorder meaning that it has to be inherited from their parents are incorrect. Most people may not inherit Williams syndrome because the chances of his or her child to inherit the syndrome is a low 50/50 chance. That is because when the deletion of the 26 – 28 genes that takes place within the chromosome number seven are of what randomly chosen events that particularly occur in the male or female eggs or sperm .When dealing with Williams syndrome many symptoms may come upon the person with this disorder. Some of the symptoms may be not be that eye catching or life threating but some, however some can be life threating. In resulting the person to ...
Although there is no cure for TSD, there are several revention methods for the disease, which gives hope to those who are carrier, but would like to bring a family into the world. Hopefully, further study and research of Tay-Sachs will lead to a cure one day, and TSD will no longer be a deadly factor for infants, and bring hope to their parents.
Achondroplasia (ACH) is a genetic disorder that is inherited as an autosomal dominant trait. This means that the disorder is not X or Y linked and is caused by the mutation of any other type of chromosome. Since ACH is a dominant disorder, meaning only one copy of a gene has a mutation or a mistake; it only takes one parent to cause the gene mutations. Dominant disorders are not inherited from mutated gene in the parent; they are new mutated genes that develop in the child, which is why people that suffer from Achondroplasia can have average-sized kids. ACH is a birth defect that is caused by mutations in the Fibroblast Growth Factor Receptor 3 (FGFR3) gene. FGFR3 is the protein responsible for lengthening bones. Its specific role is to slow down bone growth and balance the effects of other receptors and molecules that encourage growth. When FGFR3 is active, bone growth is slowed and when it’s inactive, bone growth accelerates. In people that suffer from Achondroplasia, FGFR3 is never in inactive so their bone growth never accelerates. Mutations on the FGFR3 gene are what prevent the growth of cartilage. When the receptor (R) of FGFR3 is missing, the growth factor can’t act properly and the growth...
Trussell, J., Stewart, F., Potts, M., Guest, F., & Ellertson, C. (1993). Should Oral Contraceptives
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Identification and Cure Although Turner Syndrome can be identified in the fetus or with a blood test, there is not a known cure for it. With growth hormone replacement therapy and oestrogen injections (female hormones), the female victim of Turner syndrome can live an outwardly normal life. Ongoing research in reproduction and adoption make it possible for these women to marry and raise children.
Lewis, Ricki, (2014), Human Genetics, 11th Edition, Chapter 12. Gene Mutation. [VitalSource Bookshelf Online]. Retrieved from
Many people across the world are unfamiliar with disorders associated with autism. Some people do not even know what autism actually is. Asperger’s Syndrome is one perplexing disorder, of countless, that needs to be acknowledged. Although it is one of the more well-known disorders, an understanding of Asperger’s is far from common knowledge. There is an abundance of misconceptions and people unaware of what Asperger Syndrome actually is. Being uncertain about the characteristics of a person with Asperger’s allows people to go through life not understanding the disorder itself and people who have it.
Klinefelter syndrome is a syndrome in which a person inherits an extra X-chromosome making their genetic makeup xxy instead of the normal
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