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Full trisomy 9 is a rare and fatal chromosomal disorder caused by having three copies of chromosome number 9.It can be a viable condition if the trisomic component affects only part of the cells of the body or in cases of partial trisomy of the short arm (trisomy 9p) in which cells have a normal set of two entire chromosomes 9 plus part of a third copy of the short arm ("p") of the chromosome.
Karyotype of a human with Trisomy 21 (Down syndrome). Trisomies can occur with any chromosome, but often result in miscarriage rather than live birth.For example, Trisomy 16 is most common in human pregnancies, occurring in more than 1%, but the only surviving embryos are those having some normal cells in addition to the trisomic cells (mosaic trisomy 16). [3]
Miscarriage, also known in medical terms as a spontaneous abortion, is an end to pregnancy resulting in the loss and expulsion of an embryo or fetus from the womb before it can survive independently. [1] [4] Miscarriage before 6 weeks of gestation is defined as biochemical loss by ESHRE.
As many as 25 percent of pregnancies end in miscarriage -- and researchers at a British university think they may have discovered why. New study reveals why some women might have multiple miscarriages
The pregnancy outcome is strongly chromosome specific. The most frequently seen trisomic cells in confined placental mosaicism involve chromosomes 2, 3, 7, 8 and 16. The next frequently involved are 9, 13, 15, 18, 20 and 22. [8] It has been observed that CPM involving the sex chromosomes usually has no adverse effects on fetal development. [9]
Almost all fetuses with trisomy 18 don’t survive full-term, and pregnancies end in miscarriage or stillbirth. For more CNN news and newsletters create an account at CNN.com Show comments
Trisomy 13 (Patau syndrome), trisomy 18 (Edwards syndrome) Triploid syndrome , also called triploidy , is a chromosomal disorder in which a fetus has three copies of every chromosome instead of the normal two.
Almost all fetuses with trisomy 18 don’t survive full-term, and pregnancies end in miscarriage or stillbirth. For more CNN news and newsletters create an account at CNN.com Show comments