Academy of Medical Sciences of I.R. Iran Archives of Iranian Medicine 1029-2977 15 4 2012 04 01 Two Novel Familial Balanced Translocations t(8;11)(p23;q21) and t(6;16)(q26;p12) Implicated in Recurrent Spontaneous Abortion 0 0 EN Fatemeh Keify Narges Zhiyan Farzaneh Mirzaei Semiramis Tootian Saeedeh Ghazaey Mohammad R Abbaszadegan Journal Article Reciprocal translocations represent one of the most common structural rearrangements observed in humans. Estimates of the population frequency range from 1/673 to 1/1000. We have described two novel balanced translocations in two unrelated families who experienced Recurrent spontaneous abortions (RSA) following their separatenon-consanguineous marriages. Initial cytogenetic studies were performed on cultured blood cells. High resolution GTG-banding analysis using cytovision software performed on their chromosomes revealed a novel balanced translocation t(8;11)(p23;q21) in a brother (45 years) and his sister (27 years) in one family. The second novel balanced translocation t(6;16)(q26;p12) was observed in a consanguineous couple with 4 RSA. These two families have an increased risk of having children with unbalanced karyotypes or RSA, because of incorrect chromosomal segregation during meiosis.