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Klinefelter syndrome, a congenital chromosomal abnormality with one or more extra X chromosomes, occurs in out of 400 live male births. The majority of Klinefelter men present with a 47, XXY karyotype. The "poly-X variant", with the 49,XXXXY karyotype is uncommon. This syndrome, where subjects have two or more X chromosomes presents with primary hypogonadism, and, particularly if associated with the 49,XXXXY karyotype, significantly impacts life skills across a variety of dimensions, including areas of communication, community use, functional academics, home/school living, health and safety, leisure, self-care, self direction, and work. Adaptive behavior abnormalities in 46,XXY men are well known and described. In the poly-X variant of the 49,XXXXY karyotype, adaptive behavior abnormalities are expected to be much more significant, making these patients eligible for services and Social Security benefits.
In 49,XXXXY men no study to date has examined these areas of inquiry in a large patient population, using a psychometrically sound instrument in a large patient population. Current publications are limited to individual case reports or small case summaries. It is important to study the adaptive behavior in its highly abnormal presentation in 49,XXXXY men in order to learn more about the effect of additional X chromosomes on adaptive skills, which determine how an individual responds to daily demands and in order to develop treatment and training goals.
Observational Model: Case-Only, Time Perspective: Prospective
University of Wisconsin School of Medicine and Public Health
University of Wisconsin, Madison
Published on BioPortfolio: 2014-08-27T03:43:42-0400
The haemostatic balance and neurocognitive capability of men with Klinefelter syndrome is compared to healthy controls by using specific biochemical assays for coagulation and fibrinolysis...
The purpose of this study is to evaluate the effects of low-dose androgen on the motor and cognitive development of boys with Klinefelter syndrome.
The purpose of this study is to investigate the following: 1. Whether Klinefelter Syndrome is associated with altered total and regional brain volumes and altered brain activity. ...
This study plans to learn more about how to measure the way the the body's energy system works in boys with Klinefelter syndrome, including the heart, lungs, muscles, and liver. This is im...
Klinefelter syndrome (KS) is the most common sex-chromosome disorder with a prevalence of one in 660 men and is a frequent cause of hypogonadism and infertility. It is caused by the presen...
Males with Klinefelter syndrome (KS) (47,XXY) may be more likely to develop germ cell tumors (GCTs), particularly mediastinal GCTs. To date, there are no reports characterizing the prevalence of KS am...
Multidisciplinary management of Klinefelter cases is now considered good clinical practice in order to ensure optimal quality of life. Reproductive performance of Klinefelter men is an important issue...
Approximately 1 in 650 boys are born with an extra X chromosome. Boys and men with 47,XXY (Klinefelter syndrome) are at risk for neurodevelopmental disorders and specific cognitive impairments. This s...
Klinefelter syndrome (KS) (47, XXY) is the most common sex chromosome disorder, with a prevalence of 1 in every 660 newborn males. Despite the profound adverse effects of anxiety and depression, and t...
Klinefelter Syndrome (KS) is the most common sex chromosome aneuploidy (47,XXY) and cause of male hypergonadotropic hypogonadism. It is characterized by an extreme clinical heterogeneity in presentati...
A form of male HYPOGONADISM, characterized by the presence of an extra X CHROMOSOME, small TESTES, seminiferous tubule dysgenesis, elevated levels of GONADOTROPINS, low serum TESTOSTERONE, underdeveloped secondary sex characteristics, and male infertility (INFERTILITY, MALE). Patients tend to have long legs and a slim, tall stature. GYNECOMASTIA is present in many of the patients. The classic form has the karyotype 47,XXY. Several karyotype variants include 48,XXYY; 48,XXXY; 49,XXXXY, and mosaic patterns ( 46,XY/47,XXY; 47,XXY/48,XXXY, etc.).
Condition with a variable constellation of phenotypes due to deletion polymorphisms at chromosome location 22q11. It encompasses several syndromes with overlapping abnormalities including the DIGEORGE SYNDROME, VELOCARDIOFACIAL SYNDROME, and CONOTRUNCAL AMOMALY FACE SYNDROME. In addition, variable developmental problems and schizoid features are also associated with this syndrome. (From BMC Med Genet. 2009 Feb 25;10:16) Not all deletions at 22q11 result in the 22q11deletion syndrome.
Rare congenital disorder with multiple anomalies including: characteristic dysmorphic craniofacial features, musculoskeletal abnormalities, neurocognitive delay, and high prevalence of cancer. Germline mutations in H-Ras protein can cause Costello syndrome. Costello syndrome shows early phenotypic overlap with other disorders that involve MAP KINASE SIGNALING SYSTEM (e.g., NOONAN SYNDROME and cardiofaciocutaneous syndrome).
An autosomal dominant aneurysm with multisystem abnormalities caused by increased TGF-BETA signaling due to mutations in type I or II of TGF-BETA RECEPTOR. Additional craniofacial features include CLEFT PALATE; CRANIOSYNOSTOSIS; HYPERTELORISM; or bifid uvula. Phenotypes closely resemble MARFAN SYNDROME; Marfanoid craniosynostosis syndrome (Shprintzen-Goldberg syndrome); and EHLERS-DANLOS SYNDROME.
Birth defect that results in a partial or complete absence of the CORPUS CALLOSUM. It may be isolated or a part of a syndrome (e.g., AICARDI'S SYNDROME; ACROCALLOSAL SYNDROME; ANDERMANN SYNDROME; and HOLOPROSENCEPHALY). Clinical manifestations include neuromotor skill impairment and INTELLECTUAL DISABILITY of variable severity.
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...