The XXY condition that causes Klinefelter syndrome can't be changed, but medical a child the usual way. He may be eligible If one of these defective cells contributes to a successful pregnancy, the baby This is called a haploid set. Klinefelter Syndrome (XXY chromosome) A person with this condition has an extra X chromosome, and is usually socialized as male, meaning the doctor will say, “It’s a boy!” at the delivery, and the baby henceforth will be treated like a boy. Triple X syndrome is also called 47,XXX syndrome because the extra X chromosome results in 47 chromosomes in each cell instead of the usual 46. and development. Software. Affecting about 1 in 650 newborn boys, this is one of the most common sex chromosome variations. Other forms of therapy include © 1995-document.write(KHcopyDate); The Nemours Foundation. These include 24 pairs of “autosomes” (which refers to all Klinefelter syndrome, also known as the XXY condition, is a term used to describe males who have an extra X chromosome in most of their cells. This test checks the number of chromosomes to see if the XXY syndrome is present. Klinefelter Syndrome (XXY chromosome) A person with this condition has an extra X chromosome, and is usually socialized as male, meaning the doctor will say, “It’s a boy!” at the delivery, and the baby henceforth will be treated like a boy. Older women have a slightly higher chance of having a boy with XXY syndrome, but the chance is small. Germ cells do not survive in the testes, leading to decreased sperm and androgens. larger breasts (a condition called gynecomastia), delayed or incomplete puberty (some boys won't go through puberty at all), less facial and body hair following puberty. Symptoms of Klinefelter vary with age and include: To diagnose Klinefelter syndrome, your doctor will start with a physical exam and questions about your symptoms and general health. Chromosomes are packages of genes found in every cell in the body. They rarely cause trouble and The extra X chromosomes are maternally derived in 60% of cases. Babies with Klinefelter syndrome typically have weak muscles, reduced strength, Males with XXY syndrome are born with cells that have an extra X chromosome, or XXY. Many boys with Klinefelter syndrome show symptoms related to their development Boys who have Klinefelter syndrome are born with it. The typical number of chromosomes in each human cell is 46. one X chromosome and one Y chromosome, or XY, but boys with XXY syndrome have an extra When a boy is born with the XXY condition in only some of his cells, it's called Klinefelter syndrome (KS), also known as 47,XXY is the set of symptoms that result from two or more X chromosomes in males. growth of the penis and facial and body hair. Low hormone Usually, a person has 46 chromosomes in each cell, divided into 23 pairs, which Germ cells do not survive in the testes, leading to decreased sperm and androgens. It is sometimes referred to as a variant of Klinefelter syndrome, but differs from Klinefelter syndrome in many ways and is more severe. # mosaicism involving sex chromosomes. Even the much less common 48,XXYY had been discovered in 1960, a year before 47,XYY. An illustration of a ... XXY Chromosomes Item Preview 1 nsia-XXYChromosomes/XXY Chromosomes 01.pdf. A chromosome is a strand of DNA. and the other half from the mother. This may include examining the genital area and chest, performing tests to check reflexes, and assessing development and functioning.The main tests used to diagnose Klinefelter syndrome are: 1. Because boys with Klinefelter syndrome can have problems with schoolwork and sports, can help relieve some of the symptoms. and many are less self-confident and less active than other boys their age. By the time a child with Klinefelter syndrome It can also help with penis size and stronger muscles and bones, but it won’t affect testicle size or fertility. Many benefit from extra assistance when it comes to The typical number of chromosomes in each human cell is 46. About X and Y Variations X and Y Variations, also known medically as Sex Chromosome Aneuploidy (SCA), involve variations in the typical number and type of sex chromosomes. © 2005 - 2021 WebMD LLC. Klinefelter syndrome (47, XXY) is a condition that occurs in men who have an extra X chromosome, resulting in an XXY sex chromosome karyotype. The Focus Foundation’s efforts are geared toward X & Y Chromosomal Variations including: 47, XXY (Klinefelter syndrome), 47, XYY (Jacob’s syndrome), 47, XXX (Triple X), 48, XXXX (Tetrasomy X), 48, XXXY, and 49, XXXXY. They also therapy. Many men never realize that they have it because symptoms aren’t always present. Testosterone replacement therapy throughout your life can help prevent some of the long-term problems that come with Klinefelter. XXY chromosomes are a naturally occurring human male variation. educational services or accommodations that can help your son succeed. more than two X chromosomes (XXXY or XXXXY, for example), which increases the risk Boys and men with 48,XXXY syndrome have the usual single Y chromosome… It's also called XXY because Counselors and therapists can give boys practical they have an extra X chromosome in most or all of their cells. Boys typically have Complications Although some females may have mild or no symptoms associated with triple X syndrome, other girls and women experience developmental, psychological and behavioral problems that may … Sometimes, symptoms are more evident and may include weaker muscles, greater height, poor coordination, less body hair, breast growth, and less interest in sex. Blood or urine samples can reveal abnormal hormone levels that are a sign of Klinefelter syndrome. from Graeme-xxy Plus . Many boys with Klinefelter syndrome — also known as XXY syndrome Hormone testing, which is usually done by taking a blood sample to check for abnormal XYY syndrome is a rare chromosomal disorder where a male has an extra Y chromosome. The girl has the normal chromosome … It also prevents the testicles from producing normal amounts Educational support services can help boys and teens with Klinefelter Additional testosterone can help a boy Klinefelter syndrome (sometimes called Klinefelter's, KS or XXY) is where boys and men are born with an extra X chromosome. development. Write the sex of a human having XXY chromosomes with 22 pairs of autosomes. disorder is a random error in cell division that happens when a parent's reproductive or all of these symptoms: Klinefelter syndrome typically causes a boy's testicles to grow at a slower rate Some men show symptoms of Klinefelter as children, but others don’t know they have it until puberty or adulthood. For medical matters, please consult a doctor. People typically have 46 chromosomes in each cell, two of which are the sex chromosomes. An illustration of a 3.5" floppy disk. can have milder signs and symptoms than others with the XXY condition. For further information on Klinefelter syndrome, Jacob’s syndrome, and some of the less commonly occurring X and Y disorders, click on the … If your child has Klinefelter, things that might help include: Many problems caused by Klinefelter are because of lower testosterone levels. Smart Grocery Shopping When You Have Diabetes, Surprising Things You Didn't Know About Dogs and Cats, Coronavirus in Context: Interviews With Experts, Sign Up to Receive Our Free Coroanvirus Newsletter, An extra X chromosome in every cell, which is the most common, An extra X chromosome in only some cells, called mosaic Klinefelter, in which you don’t have as many symptoms, More than one extra X chromosome, which is very rare and more severe, Slower to learn to sit up, crawl, and talk, Testicles that haven’t dropped into the scrotum, A hard time making friends and talking about feelings, Problems learning to read, write, and do math, Less muscle tone, and muscles grow slower than usual, Longer arms and legs, wider hips, and a shorter torso than other boys their age, Puberty never comes, comes later, or doesn’t quite finish, Support in school to help with social skills and learning delays, Playing sports and other physical activities to build muscles, Taking part in group activities to learn social skills. any learning or behavior issues and examining the boy's testicles and body proportions. Johns Hopkins Medicine: “Klinefelter Syndrome.”, Genetic and Rare Diseases Information Center: “Are people with Klinefelter syndrome able to have children?” “What is Klinefelter syndrome?”, Journal of Clinical Endocrinology & Metabolism: “Klinefelter Syndrome: A Clinical Update.”. Klinefelter syndrome. Klinefelter syndrome is not caused by anything the parents did or did not do. schoolwork. skills to help them feel more confident in social settings. One common treatment is testosterone replacement therapy. Klinefelter syndrome is the most common sex chromosome disorder, occurring in about 1/500 live male births. consult your doctor. Because of this, XXXY syndrome only affects … All rights reserved. A chromosome is a strand of DNA. Probably because of reasons of ignorance some XXY males think their additional X is fully active and their Y is almost completely inactive. Klinefelter syndrome is a genetic condition affecting males, and it often isn't diagnosed until adulthood.Klinefelter syndrome may adversely affect testicular growth, resulting in smaller than normal testicles, which can lead to lower production of testosterone. Some boys will even have 48,XXXY syndrome is a sex chromosome disorder in boys and men that results from having two extra X chromosomes in each cell. Kleinfelter syndrome facts author: John P. Cunha, DO, FACOEP. XXXY syndrome is a genetic condition characterized by a sex chromosome aneuploidy, where males have two extra X chromosomes. Affecting about 1 in 650 newborn boys, this is one of the most common sex chromosome variations. A list of doctors knowledgeable in the area of genetics and XXY can be found here. In the wake of the establishment of the normal number of human chromosomes, 47,XYY was the last of the common sex chromosome aneuploidies to be discovered, two years after the discoveries of 47,XXY, 45,X, and 47,XXX in 1959. Often, symptoms are subtle and subjects do not realize they are affected. WebMD does not provide medical advice, diagnosis or treatment. school principal, or school counselor. Klinefelter syndrome is the most common sex chromosome disorder, occurring in about 1/500 live male births. Some research has found that life expectancy for men with the condition may be a year or two less than those without it  because of other health problems linked to Klinefelter. 49,XXXXY syndrome is a type of chromosome abnormality characterized by the presence of 3 extra X chromosomes in males. 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