Clinical outcomes and counseling issues regarding partial trisomy of terminal Xp in a child with developmental delay

Female carriers of balanced translocations involving an X chromosome and an autosome present genetic councelling challenges. This is in view of the number of possible meiotic outcomes, but also due to the impact of X chromosome-localised genes that are no longer subject to gene silencing through the X chromosome inactivation centre. We present a case where delineation of the extent of X chromosome-localised genes on the derivative autosome using molecular karyotyping offers critical information in the context of genetic councelling