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Mutations causing SOX3 loss-of-function do not affect the sex determination in mice or humans. However, transgenic mouse studies have shown that ectopic expression of Sox3 in the bipotential gonad in upregulation of Sox9, resulting in testicular induction and XX male sex reversal. However, the mechanism by which these rearrangements cause sex reversal and the frequency with which they are associated with disorders of sex development remains unclear.
XX maleness is a rare syndrome with a frequency of 1 in 20 —25 males. XX males exist in different clinical with ambiguous genitalia or partially to fully mature male genitalia, in combination with complete or incomplete masculinization. In this study, we report a case of SRY -negative XX male with complete masculinization but infertility. The patient had fully mature male genitalia with descended but small testes and no s of undervirilization. Absence of SRY gene was confirmed by three independent PCRs for each of two sets of primers covering an increasing length of the gene.
Swyer syndrome is a condition that affects sexual development. Sexual development is usually determined by an individual's chromosomes; however, in Swyer syndrome, sexual development does not match the affected individual's chromosomal makeup. People usually have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics.
Girls and women typically have two X chromosomes 46,XX karyotypewhile boys and men usually have one X chromosome and one Y chromosome 46,XY karyotype. In Swyer syndrome, individuals with one X chromosome and one Y chromosome in each cell, the pattern typically found in boys and men, have female reproductive structures. People with Swyer syndrome have typical female external genitalia. The uterus and fallopian tubes are normally-formed, but the gon ovaries or testes are not functional; affected individuals have undeveloped clumps of tissue called streak gon.
Because of the lack of development of the gon, Swyer syndrome is also called 46,XY complete gonadal dysgenesis. The residual gonadal tissue often becomes cancerous, so it is usually removed surgically early in life. People with Swyer syndrome are typically raised as girls and have a female gender identity.
Because they do not have functional ovaries, affected individuals usually begin hormone replacement therapy during adolescence to induce menstruation and development of female secondary sex characteristics such as breast enlargement and uterine growth. Hormone replacement therapy also helps reduce the risk of reduced bone density osteopenia and osteoporosis.
Health conditions related to genetic changes
Women with this disorder do not produce eggs ovabut they may be able to become pregnant with a donated egg or embryo. Swyer syndrome usually affects only sexual development; such cases are called isolated Swyer syndrome. However, depending on the genetic cause, Swyer syndrome may also occur along with health conditions such as nerve problems neuropathy or as part of a syndrome such as campomelic dysplasiawhich causes severe skeletal abnormalities.
Mutations in the SRY gene have been identified in approximately 15 percent of individuals with Swyer syndrome. The SRY gene, located on the Y chromosome, provides instructions for making the sex-determining region Y protein.
This protein is a transcription factor, which means it attaches binds to specific regions of DNA and helps control the activity of particular genes. The sex-determining region Y protein starts processes that are involved in male sexual development. These processes cause a fetus to develop male gon testes and prevent the development of female reproductive structures uterus and fallopian tubes.
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SRY gene mutations that cause Swyer syndrome prevent production of the sex-determining region Y protein or result in the production of a nonfunctioning protein. A fetus whose cells do not produce functional sex-determining region Y protein will not develop testes but will develop a uterus and fallopian tubes, despite having a typically male karyotype.
Swyer syndrome can also be caused by mutations in the MAP3K1 gene; research indicates that mutations in this gene may for up to 18 percent of cases. The MAP3K1 gene provides instructions for making a protein that helps regulate aling pathways that control various processes in the body.
These include the processes of determining sexual characteristics before birth. The mutations in this gene that cause Swyer syndrome decrease aling that le to male sexual differentiation and enhance aling that le to female sexual differentiation, preventing the development of testes and allowing the development of a uterus and fallopian tubes.
The DHH gene provides instructions for making a protein that is important for early development of tissues in many parts of the body. The NR5A1 gene provides instructions for producing another transcription factor called the steroidogenic factor 1 SF1.
This protein helps control the activity of several genes related to the production of sex hormones and sexual differentiation. Mutations in the DHH and NR5A1 genes affect the process of sexual differentiation, preventing affected individuals with a typically male karyotype from developing testes and causing them to develop a uterus and fallopian tubes.
Changes affecting other genes have also been identified in a small of people with Swyer syndrome. Nongenetic factors, such as hormonal medications taken by the mother during pregnancy, have also been associated with this condition. However, in most individuals with Swyer syndrome, the cause is unknown. Most cases of Swyer syndrome are not inherited; I like xx sex s occur in people with no history of the condition in their family.
These cases result either from nongenetic causes or from new de novo mutations in a gene that occur during the formation of reproductive cells eggs or sperm or in early embryonic development. SRY -related Swyer syndrome is usually caused by a new mutation. However, some individuals with Swyer syndrome inherit an altered SRY gene from an unaffected father who is mosaic for the mutation. Mosaic means that an individual has the mutation in some cells including some reproductive cells but not in others.
In rare cases, a father may carry the mutation in every cell of the body but also has other genetic variations that prevent him from being affected by the condition. In the rare inherited cases, the mutation may be inherited from either parent, since these genes are not on the Y chromosome. In these cases, the condition has an autosomal dominant pattern of inheritance, which means one copy of the altered gene in each cell is sufficient to cause the condition.
Swyer syndrome caused by mutations in the DHH gene is inherited in an autosomal recessive patternwhich means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition are carriers of one copy of the altered gene.
Female carriers of a DHH gene mutation generally have typical sex development.
Male carriers of a DHH gene mutation may also be unaffected, or they may have genital differences such as the urethra opening on the underside of the penis hypospadias. Genetics Home Reference has merged with MedlinePlus. Learn more. The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health.
Swyer syndrome. From Genetics Home Reference. Description Swyer syndrome is a condition that affects sexual development. Frequency Swyer syndrome occurs in approximately 1 in 80, people. Causes Mutations in the SRY gene have been identified in approximately 15 percent of individuals with Swyer syndrome.
Inheritance Most cases of Swyer syndrome are not inherited; they occur in people with no history of the condition in their family. DSDs: genetics, underlying pathologies and psychosexual differentiation.
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Mutations in MAP3K1 cause 46,XY disorders of sex development and implicate a common al transduction pathway in human testis determination. Am J Hum Genet. Swyer syndrome, 46,XY gonadal dysgenesis, a sex reversal disorder with dysgerminoma: a case report and literature review.
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