What is the phenotype of Klinefelter syndrome?
What is the phenotype of Klinefelter syndrome?
Klinefelter syndrome (KS) (47,XXY) occurs in ∼1 in 650 males, and is associated with a physical phenotype that can include tall stature, hypogonadism, and fertility problems.
What is the characteristics of Klinefelter syndrome?
Boys and teenagers Taller than average stature. Longer legs, shorter torso and broader hips compared with other boys. Absent, delayed or incomplete puberty. After puberty, less muscle and less facial and body hair compared with other teens.
What is the phenotype of child who has XXY?
The behavioral phenotype of 47,XXY (Klinefelter syndrome) includes increased risks for developmental delays, language-based learning disabilities, executive dysfunction/ADHD, and socialemotional difficulties.
What is the karyotype of Klinefelter syndrome?
Klinefelter Syndrome (47, XXY) is a chromosomal variation in males in which one extra X chromosome is present, resulting in a 47,XXY karyotype. The extra X chromosome typically affects physical, neurodevelopmental, behavioral, and neurocognitive functioning.
What is the karyotype of Down syndrome?
The trisomy 21 karyotype figure shows the chromosomal arrangement, with the prominent extra chromosome 21. Trisomy 21 is the cause of approximately 95% of observed Down syndrome, with 88% coming from nondisjunction in the maternal gamete and 8% coming from nondisjunction in the paternal gamete.
What type of aneuploidy is Klinefelter syndrome?
The term Klinefelter syndrome (KS) describes a group of chromosomal disorder in which there is at least one extra X chromosome to a normal male karyotype, 46,XY. XXY aneuploidy is the most common disorder of sex chromosomes in humans, with prevalence of one in 500 males.
What does XX XY mean in karyotyping?
Each person normally has 23 pairs of chromosomes in each cell (23 pairs = 46 total chromosomes). One of these pairs is called the sex chromosomes (X and Y). They determine if you will be male or female. If you are male, you have an XY pair. If you are female, you have an XX pair.
How are karyotypes interpreted?
A karyotype examines a person’s chromosomes to determine if the right number is present and to determine if each chromosome appears normal. It requires experience and expertise to perform properly and to interpret the results.
Is Klinefelter syndrome caused by aneuploidy?
Klinefelter syndrome (XXY aneuploidy) is the most common human sex chromosome disorder. Approximately 1 in 500-600 males is born with an extra X chromosome.
What is the incidence of Klinefelter syndrome?
The prevalence of Klinefelter syndrome is approximately 1 to 2.5 per 1000 boys and men (0.1 to 0.25 percent) [1-4]. Only 25 to 50 percent of patients with Klinefelter syndrome are diagnosed during their lifetimes [1,3,4]. Klinefelter syndrome results from supernumerary X chromosomes in an XY male (X1+nY).
What are the side effects of Klinefelter syndrome?
Klinefelter syndrome may adversely affect testicular growth, resulting in smaller than normal testicles, which can lead to lower production of testosterone. The syndrome may also cause reduced muscle mass, reduced body and facial hair, and enlarged breast tissue. The effects of Klinefelter syndrome vary,…
How is Klinefelter syndrome diagnosed?
See a doctor. Klinefelter Syndrome is usually diagnosed by evaluating the outward symptoms (e.g. small testes, tall/slender build, and low testosterone), and confirmed by analyzing the chromosomes in white blood cells.
What causes Klinefelter syndrome (KS)?
Definition. Klinefelter or XXY syndrome is a genetic disease that causes babies to be born with an extra X chromosome.
What is karyotype Klinefelter syndrome?
Klinefelter Syndrome (47, XXY) is a chromosomal variation in males in which one extra X chromosome is present, resulting in a XXY sex chromosome karyotype. The extra X chromosome can affect physical, developmental, behavioral, and cognitive functioning.
