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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.
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).
Monosomy is the reason that one X chromosome is missing completely, which means that every cell in the person’s body is missing one X chromosome. Mosaic Turner Syndrome, also known as mosaicism or Turner mosaicism, is an error that occurs in the early stages of fetal devel...
Deletion is a mutation in which a part of the chromosome or the DNA is absent or lost. It may be inherent, or it may be due to improper chromosomal crossing-over during meiosis. This deletion is responsible for the abnormalities in the patient. One of the known disorders seen due to deletion is the Wolf-Hirschhorn syndrome.
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...
It is pretty outstanding how Achondroplasia is such a common disorder. However, what is really mind boggling is that there is still no cure or treatment that a person could go through. Since the disorder is so common and so impactful, you would think more research would be dedicated to finding a cure. Achondroplasia has many painful side effects and causes much strain on people’s lives. If a person suffers from Achondroplasia and decides to have kids, they have a 50% chance of passing it on to their children. Overall, Achondroplasia is a debilitating autosomal disorder that causes unnecessary amounts of strain on everyday lives.
There are many possible reasons why a child may grow slowly, including: hereditary factors (short parents), diseases affecting the kidneys; heart, lungs or intestines; hormone imbalances; severe stress or emotional deprivation; infections in the womb before birth; bone diseases; and genetic or chromosomal abnormalities. The Turner Syndrome (known as Ullrich-Turner Syndrome in Germany) is a congenital disease. A German doctor named Ullrich published his article in 1930. American doctor Henry Turner recognized a pattern of short stature and incomplete sexual maturation in otherwise normal females.
This genetic disorder is not specific to a certain age, ethnic group, or gender; theref...
Every cell contains forty-six chromosomes (twenty-three pairs). One, out of the twenty-three pairs, is in control of a person’s gender. There two different kinds of chromosomes: X and Y. Males are born with one X chromosome and one Y chromosome. Females, however, are born with two X chromosomes. According to Cindy Dunham and Catherine H. Ward, girls with Turner syndrome are missing part of, or all of the X chromosome (3). The chromosome becomes absent before or shortly after conception (Overview par. 3). Girls diagnosed with Turner syndrome are confirme...
Lesch Nyhan Syndrome (LNS) was first reported in 1964 by Michael Lesch and William L. Nyhan. It is a rare disorder located on the x chromosome. It is a sex-linked trait, which means that it is passed from mother to son. This condition can be inherited or occur spontaneously as a result of a genetic mutation. It usually appears once in every 100,000 male births. Since the defective gene is recessive, females almost never exhibit symptoms of the disease. However, they can be carriers of the allele.
In order to test the hypothesis and ensure that other genes in the larger chromosome region were not the real cause of pelvic loss the scientists generated F1 hybrids between both pelvic-completed and pelvic-reduced sticklebacks as well as two pelvic-complete populations. These F1 hybrids allowed for combination of the alleles of Pitx1 from pelvic-complete (FRIL, LITC) and pelvic-reduced (PAXB) populations. Brain and pelvic tissues were isolated to compare the expression of either the LITC or PAXB allele to the FRIL allele. The results supported the initial hypothesis as expression of the PAXB Pitx1 allele was greatly reduced in the pelvis but not the head of F1 hybrids, indicating a tissue-specific, cis-regulatory change in the Pitx1 locus. If indeed other genes in the larger chromosome region were the real cause of pelvic reduction then there would have been a secondary or trans-acting reduction seen in the expressions of Pitx1 in both
The growth and development of a prenatal baby is sometimes taken for granted by the parents, but one little change in a chromosome can result in a variety of genetic disorders. Discovered by Dr. Jerome Lejune, Cri-du-Chat Syndrome is the production of a deletion in the short arm of the chromosome number 5. Cri-du-Chat Syndrome has a number of symptoms, but the distinctive feature is the cat-like “mew” that infants produce, which is what the syndrome is named for. This rare genetic disorder affects an estimated 1 in 20,000 to 50,000 live births, is more common in females (a 4:3 ratio), and is seen in all ethnicities. (4& 5 Curriti)
The second reason woman get medical attention for PCOS, is that they have worries about their physical ...
This is usually caused by non-disjunction. Other causes of TS cells are missing all or part of an X chromosome. Another words instead of XX or XY, it’s an XO chromosome. The missing X, or Y, Chromosome of TS causes errors during fetal development and other problems after birth.
There are many different types of dwarfism that researchers have confirmed today, but there still are many genes for dwarfism that remain unidentified.The most common of these known causes is achondroplasia, a bone growth disorder.The Little People Online website states that most dwarfs who suffer from achondroplasia are born to “average-size” parents, and that their birth rate is somewhere between onein26,000-40,000www.lpaonline.org).The main characteristics of this form of dwarfism are normal trunk size with short appendages, irregularly large heads wi...