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Human Reproduction, Vol 12, 2019-2027, Copyright © 1997 by Oxford University Press

ARTICLES

Carrier-specific breakpoint-spanning DNA probes: an approach to preimplantation genetic diagnosis in interphase cells

MJ Cassel, S Munne, J Fung and HU Weier
Resource for Molecular Cytogenetics, Life Sciences Division, University of California, Berkeley 94720, USA.

Carriers of chromosomal inversions or other balanced rearrangements represent a significant fraction of patients in in-vitro fertilization (IVF) programmes due to recurrent reproductive problems. In most cases, chromosomal imbalance in fertilized oocytes is incompatible with embryo survival leading to increased rates of spontaneous abortions. Assuming that a fraction of the germ cells is karyotypically normal, these patients would greatly benefit from efficient procedures for generation and use of breakpoint-specific DNA hybridization probes in preconception and preimplantation genetic diagnosis (PGD). We describe the generation of such patient-specific probes to discriminate between normal and aberrant chromosomes in interphase cells. First, a large insert DNA library was screened for probes that bind adjacent to the chromosomal breakpoints or span them. Then, probe and hybridization parameters were optimized using white blood cells from the carrier to increase in hybridization signal intensity and contrast. Finally, the probes were tested on target cells (typically polar bodies or blastomeres) and a decision about the colour labelling scheme was made, before the probes can be used for preconception or preimplantation genetic analysis. Thus, it was demonstrated that cells with known structural abnormalities could be detected, based on hybridization of breakpoint spanning yeast artificial chromosome (YAC) DNA probes in interphase cells.
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