47,XXY means a male has an extra X chromosome in each cell, leading to Klinefelter syndrome (KS), a genetic condition characterized by having 47 chromosomes instead of the usual 46, resulting in varied physical and developmental traits like infertility, small testes, reduced facial/body hair, and learning difficulties. It's a common chromosomal variation that isn't inherited, often going undiagnosed until adulthood, and is manageable with treatments like testosterone therapy.
Most often, people with Klinefelter syndrome have the usual X and Y chromosomes, and one extra X chromosome, for a total of 47 chromosomes (47,XXY). Individuals with Klinefelter syndrome have an extra copy of multiple genes on the X chromosome.
Usually, a female baby has 2 X chromosomes (XX) and a male has 1 X and 1 Y (XY). But in Klinefelter syndrome, a boy is born with an extra copy of the X chromosome (XXY). The X chromosome is not a "female" chromosome and is present in everyone.
If I have KS, will I be able to get a woman pregnant? It is possible that an XXY male could get a woman pregnant naturally. Although sperm are found in more than 50% of men with KS,3 low sperm production could make conception very difficult.
Fertile females with a 47,XXY karyotype and loss of SRY are extremely rare. This paper is the first report of a 47,XXY pregnant woman with a normal phenotype and may enrich our knowledge on 47,XXY individuals.
Abstract. 46,XY pure gonadal dysgenesis (Swyer syndrome) is characterized by normal female genitalia at birth. It usually first becomes apparent in adolescence with delayed puberty and amenorrhea. Rarely, patients can present with spontaneous breast development and/or menstruation.
The main symptoms of this genetic syndrome include:
Less facial hair than other males, as well as less public hair. Gynecomastia – breast tissue development. A taller-than-average body, thin stature, and long arms and legs that are not proportionate to the rest of the body.
Two of the most common intersex conditions, androgen insensitivity and Klinefelter's syndrome, are described with an emphasis on aspects that are of relevance to psychiatrists.
In general, life expectancy is normal. 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.
Males who carry an extra Y chromosome are also tall, averaging 6'3”. However, unlike those with Klinefelter syndrome (XXY), those with XYY syndrome often have macrocephaly and macro-orchidism (a large head and large testes), but otherwise normal secondary male sexual characteristics, and prominent acne in adolescence.
Swyer syndrome. A rare genetic condition in which people who have an X chromosome and a Y chromosome (the usual pattern for males) look female. They have normal female reproductive organs, including a uterus, fallopian tubes, and vagina.
There is also evidence that people with KS/XXY may be more likely to be gender divergent. In one questionnaire survey of 87 people with KS/XXY, only 65% reported feeling masculine whereas 30% reported feeling neither masculine nor feminine and 5% reported feeling feminine (Herlihy, McLachlan, et al., 2011).
Yes, some XY females, particularly those with conditions like Swyer syndrome, can get pregnant and carry a baby, but it requires specific circumstances, usually involving hormone therapy and donated eggs because they lack functional ovaries and eggs; pregnancy is possible if they have a uterus, which they often do, though it may be underdeveloped.
The XX male syndrome is a very uncommon condition (1–9 cases per 1,000,000 males) difficult to diagnose before puberty or adult age due to the scarcity or absence of physical manifestations. It may be suspected in a newborn with perineal hypospadias and cryptorchidism.
Monogenic disorders
The XXY condition that causes Klinefelter syndrome can't be changed, but medical treatment and working with therapists can help a boy's development and lessen the condition's effects. Even without treatment, most boys with Klinefelter syndrome grow up to live productive, healthy lives.
Most people with Klinefelter syndrome produce little or no sperm, but assisted reproductive procedures may make it possible for some people with Klinefelter syndrome to have biological children.
However, the range of IQ values in boys with Klinefelter Syndrome was 70 to 130, so it is clearly possible to have above average intelligence with this condition. Boys with Klinefelter Syndrome tend to do less well at school than their brothers and sisters and may feel discouraged by this.
Some men with Klinefelter syndrome can appear younger, as the disease has affected their testosterone level causing reduced beard and secondary body hair.
Klinefelter syndrome, also called 47,XXY, is a genetic condition that occurs in males when they have an extra X chromosome. This can cause problems with development and fertility.
Sometimes the term Disorders of Sex Development is used, as is Variations in Sex Characteristics (VSC) or Diverse Sex Development. Some people prefer to use the term intersex.
Baby boys with Klinefelter Syndrome look completely normal at birth. Research has shown that they may be slightly smaller than babies with normal chromosomes. The genitals appear normal, although often one or both testicles will not have come down into the scrotum (an undescended testicle).
Generally, individuals possessing 47, XXY karyotype have male phenotype. However, in the present case in spite of the presence of Y chromosome and the normal SRY, SOX9, and ZFY genes, the individual has a female phenotype.
Signs You Might Be Intersex
Despite having the XY chromosomal makeup, girls with Swyer syndrome look female and have functional female genitalia and structures including a vagina, uterus and fallopian tubes. Girls with Swyer syndrome lack sex glands (ovaries).