TRIPLOIDIES IN FIRST AND SECOND TRIMESTERS OF PREGNANCIES IN TURKEY
Yilmaz Z1, Sahin FI1,*, Tarim E2, Kuscu E2
*Corresponding Author: Yilmaz Z1, Sahin FI1,*, Tarim E2, Kuscu E2*Corresponding Author: Professor Dr. Feride Iffet Sahin, Department of Medical Genetics, Faculty of Medicine, Baskent University, Kubilay Sokak No: 36 Maltepe, 06570 Ankara, Turkey; Tel.: +90-312-2324400/138; Fax: +90-312-2319134; E-mail: feridesahin@hotmail.com
page: 71

Abstract

 

Triploidy is the most common chromosomal abnormality in human conceptions that cause fetal loss before 20 weeks of gestation and has an incidence of 1 in 10,000 live births. Placental changes, fetal malformations and intrauterine growth retardation (IUGR) occur in triploid pregnancies. We performed karyotype analyses of 75 spontaneous abortions and 1,114 amniotic fluid cultures by conventional methods between 2002 and 2005 at our cyto genetics laboratory. Triploidy was detected in five spontaneous abortions and four amniotic fluid samples. Abortions were between the 9th and 13th weeks of pregnancy, and cytogenetic analyses revealed a 69,XXY karyotype in four of the aborted fetuses and a 69,XXX karyotype in one. Amniotic fluid cell cultures revealed a 69,XXX karyotype in three cases and 69,XXY in one. Amniocentesis was performed in four patients because of an increased trisomy 18 risk detected in maternal serum screening. In pregnant women undergoing second trimester amniocentesis, increased risk for trisomy 18 may be due to triploidy and should be taken into account during genetic counseling.

Key words: Triploidy, Maternal serum screening, Cytogenetics, Pregnancy







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