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Genital anomalies, ranging from female genitalia to milder degrees of undervirilization, are rarely reported in Klinefelter syndrome, in which a male is classically expected to be born with male external genitalia. Though androgen insensitivity syndrome (AIS) is one of the possible pathogenic mechanisms also in Klinefelter syndrome with genital anomalies, to date the AR gene has not been analyzed in any of the published cases of Klinefelter syndrome of the milder phenotype, except for those patients presenting with a severe phenotype, such as female external genitalia.Lack of interest in considering androgen insensitivity in Klinefelter syndrome with a milder phenotype of genital anomalies may impede its identification through an accurate diagnosis. We present a 14-month-old boy with penoscrotal hypospadias, micropenis, and a ventral penile chordee abnormality who was observed to have both a 47,XXY karyotype and a known missense mutation in the ARgene that was inherited from his mother. Although it is recommended that Klinefelter syndrome be considered in the differential diagnosis of penoscrotal abnormalities, mutations in specific genes involved in androgen synthesis or responsiveness should also be investigated.
This article was published in the following journal.
Name: Hormones (Athens, Greece)
Klinefelter syndrome is a condition in which a male patient has one Y chromosome and one or more extra X chromosomes. It is the most common sex chromosome disorder. Klinefelter syndrome is distinguish...
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...
To investigate the clinical application and outcomes of microdissection testicular sperm extraction (micro-TESE) in patients with nonmosaic Klinefelter syndrome (KS).
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...
Hypospadias is the second most common malformation of the male genitalia and consists in a congenital hypoplasia of its ventral face. Hypospadias results from abnormal development of the p...
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...
A form of long QT syndrome that is without congenital deafness. It is caused by mutation of the KCNQ1 gene which encodes a protein in the VOLTAGE-GATED POTASSIUM CHANNEL.
A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.
Congenital syndrome characterized by a spectrum of malformations including the absence of the THYMUS and PARATHYROID GLANDS resulting in T-cell immunodeficiency and HYPOCALCEMIA. Other features include defects in the outflow tract of the HEART and craniofacial anomalies (velocardiofacial syndrome). Most cases result from a deletion of chromosome 22q11.2 or mutation in the TBX1 gene.
A condition characterized genotypically by mutation of the distal end of the long arm of the X chromosome (at gene loci FRAXA or FRAXE) and phenotypically by cognitive impairment, hyperactivity, SEIZURES, language delay, and enlargement of the ears, head, and testes. MENTAL RETARDATION occurs in nearly all males and roughly 50% of females with the full mutation of FRAXA. (From Menkes, Textbook of Child Neurology, 5th ed, p226)
A syndrome caused by large deletions of the telomereic end of the short arm of CHROMOSOME 4 (4p) in Wolf-Hirchhorn syndrome critial regions (WHSCRs). Several candidate genes have been identified including WHSC1 and WHSCH2 which appear to be responsible for the core phenotype and in combination with other linked and unlinked genes determine the severity and inclusion of rarer phenotypes. Most cases have a characteristic cranio-facial defect often referred to as "Greek helmet face" - a combined result of MICROCEPHALY, broad forehead, prominent glabella, HYPERTELORISM, high arched eyebrows, short philtrum and micrognathia. In addition there is mental retardation, growth delays, EPILEPSY, and frequently a wide range of midline and skeletal defects, including HYPOSPADIAS; CONGENITAL HEART DEFECTS; CLEFT LIP; CLEFT PALATE; colobomata; CLUBFOOT; clinodactyly; SCOLIOSIS; and KYPHOSIS.
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...