FAQ - trisomy
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What is the difference between Trisomy 21 and XXX?
Because trisomy 21 has three X chromosomes and so does the XXX mutation. So what is the difference?
Oh, Im asking the difference between TRISOMY 21 (Down Syndrome) and the XXX mutation. Thanks for the try. =)
XXX mutation is a mutation causing an extra sex chromosome.
As our cells have 22 pairs of chromosomes (exc. gametes), chromosome 21 is a triplet. (+ info
What vitamins can I take to help reduce risk of trisomy pregnancy ?
Wnat to reduce the risks of having ganother trisomy 18 pregnancy . Any advice would be helpful.
It's a genetic disorder honey, there are no meds or vits you can take to prevent it. (+ info
How do I get in contact with a parent that has a kid with Trisomy 13?
Hi I'm doing a school project on genetic disorders. My project is on Trisomy 13 or Patau syndrome. I would like to know how I can get in contact with a parent that has a kid with Trisomy 13. I would like to do a small interview about your daily life. Thank you.
I ran a Google search on Trisomy 13 and this website was the second link:
http://www.livingwithtrisomy13.org/ (+ info
What are the causes of a partial trisomy 18?
My son is 23 days old, he is conected to a breathing machine and genetic doctors think he may have a partial trisomy. Also we need to know the recurrence of this.
Thank you very very very much
Trisomy 18 is a relatively common syndrome affecting approximately 1 out of 3,000 live births, and affecting girls more than three times as often as boys. It is caused by the presence of an extra number 18 chromosome, which leads to multiple abnormalities. Many of these abnormalities make it hard for infants to live longer than a few months.
Trisomy 18 is a chromosomal condition related to chromosome 18.
People with trisomy 18 have additional DNA from chromosome 18 in some or all of their cells. The extra material disrupts the normal course of development, causing the characteristic features of trisomy 18.
Trisomy 18 results when each cell in the body has three copies of chromosome 18 instead of the usual two copies. A small percentage of cases occur when only some of the body's cells have an extra copy of chromosome 18, resulting in a mixed population of cells with a differing number of chromosomes. Such cases are sometimes called mosaic trisomy 18.
Very rarely, a piece of chromosome 18 becomes attached to another chromosome (translocated) before or after conception. Affected people have two copies of chromosome 18, plus extra material from chromosome 18 attached to another chromosome. With a translocation, the person has a partial trisomy for chromosome 18 and often the physical signs of the syndrome differ from those typically seen in trisomy 18.
For more info just click the site below. Hope these will help you. (+ info
Is it true that women with Trisomy X tend to be extremely attrractive?
I heard this in an article that claimed Gemma Ward who is a famous model might have Trisomy X which is a hermaphroditism that makes "super-females". It said that they tend to be more attractive than most women, which is why there are many models who are intersex and have Androgen Insensitivity Syndrome or Trisomy X.
I've never heard that before. The extra X chromosome in females is deactivated in Barr bodies, so the third X chromosome in women with trisomy X is deactivated in the same way. As far as I know there aren't really any major effects with having two X chromosomes deactivated instead of one, but I could be wrong. (+ info
What are the chances of me conceving another child with trisomy 18?
My daughter Elizabeth was diagnosed with trisomy 18 syndrome but sadly she died before birth. I would like to know what the chances of me conceiving another child with a chromosomal syndrome again.
I think if you are a carrier, then 25%. But the disease is 1 in 3000 births. If you are an older mother, it's riskier because the chances increase with maternal age. (+ info
Is trisomy a genetic disorder that 'runs in the family'?
I just want to know whether trisomy is a genetic disorder that can be passed from parents to an offspring or just a disorder resulted from a mistake in an individual's cell division.
And also, I would appreciate for some helpful links that can help me with my study regarding this particular topic.
There are different types of Trismoy- Trisomy 13, 18, 21
Some types of Trisomy 18 can be:
"Most cases of trisomy 18 are not inherited, but occur as random events during the formation of eggs and sperm. An error in cell division called nondisjunction results in a reproductive cell with an abnormal number of chromosomes. For example, an egg or sperm cell may gain an extra copy of chromosome 18. If one of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have an extra chromosome 18 in each of the body's cells.
Mosaic trisomy 18 is also not inherited. It occurs as a random event during cell division early in embryonic development. As a result, some of the body's cells have the usual two copies of chromosome 18, and other cells have three copies of this chromosome.
Translocation trisomy 18 can be inherited. An unaffected person can carry a rearrangement of genetic material between chromosome 18 and another chromosome. This rearrangement is called a balanced translocation because there is no extra material from chromosome 18. Although they do not have signs of trisomy 18, people who carry this type of balanced translocation are at an increased risk of having children with the condition."
Trisomy 13 can be also:
"Most cases of trisomy 13 are not inherited and result from random events during the formation of eggs and sperm in healthy parents. An error in cell division called nondisjunction results in a reproductive cell with an abnormal number of chromosomes. For example, an egg or sperm cell may gain an extra copy of chromosome 13. If one of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have an extra chromosome 13 in each cell of the body.
Translocation trisomy 13 can be inherited. An unaffected person can carry a rearrangement of genetic material between chromosome 13 and another chromosome. These rearrangements are called balanced translocations because there is no extra material from chromosome 13. A person with a balanced translocation involving chromosome 13 has an increased chance of passing extra material from chromosome 13 to their children."
Trisomy 21 Can Also (sorry there's not much info on this one):
"Even though the risks of having a trisomy 21 child are increased with age, there is still a certain level of risk with all pregnancies no matter what age the mother is. Your doctors were correct, "It just happens sometimes".
Of all genetic disorders, Trisomy 21 is the most sporadic in it's occurrence. This means that if you have a Downs Syndrome in the family then it does not significantly increase the chances of a recurrence within the family. Other genetic problems can have more of an effect on the statistics."
More info on Trisomy 21 here: http://www.ds-health.com/trisomy.htm
Hope this helps!!
Bethan D, (13)
Wales, UK. (+ info
What are the effects on a baby when they have a trisomy?
What are the effects on a baby when they have a trisomy? andwhat happends?
how frequent would this occur during a pregnancy? what is the description of this desease? what would some support groups be ? .. i have 3 chromosals that are the same, number 13
Trisomy is extremely rare, about 1 in 5000 births. Unfortunately, 80% of children born with syndrome die within a month. However, some do survive, but often with problems such as brain and heart defects. A support organisation is http://www.trisomy.org. Also check out http://www.livingwithtrisomy13.org.
I am very sorry for this diagnosis. All the best. (+ info
Does Trisomy 13 or Patau Syndrome eventually lead to death and what is the average life span of someone withit
Thank you for your answers, I need to know what trisomy 13 leads to...is it death? Anyway it is or if it isn't what is the average lifespan of someone with Trisomy 13, Patau Syndrome?
I assume you know what Trisomy 13 is. Most babies don't survive to birth. Out of the ones which do, about 80% to 85% die before 1 year of age. To my knowledge, there are fewer than 100 children in the world with trisomy 13 who have survived this disorder. Much depends on the extent in which the nervous system is affected. Those poor children affected often develop respiratory and feeding complications.
I know this isn't what you want to hear but any other claim would be a disservice. However; there is a journal article on a child who did survive. It is located at
http://www.funpecrp.com.br/gmr/year2004/vol2-3/gmr0072_full_text.htm (+ info
Has anyone got pregnant successfully after multiple trisomy losses?
Has anyone got pregnant successfully either with PGD/IVF or natural conception after multiple trisomy losses?
I had two trisomy losses(t21 and t13) with natural pg(age 40, no history of trisomies with me and my partner). I am still hoping to conceive.
Want to hear your positive results!
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