Heart transplant biopsies

MOLECULAR PROFILING IMPROVES DIAGNOSES OF REJECTION AND INFECTION IN TRANSPLANTED ORGANS. The monitoring of transplanted hearts is currently based on histological evaluation of endomyocardial biopsies, a method that is fairly insensitive and that does not always accurately discriminate between rejection and infection in the heart. Accurate diagnosis of rejection and infection is absolutely crucial, however, as the respective treatments are completely different. Using microarrays we analyzed gene expression in 76 cardiac biopsies from 40 heart recipients undergoing rejection, no rejection, or T. cruzi infection. We found a set of 98 genes whose expression patterns were typical of acute rejection, and 87 genes that discriminated between rejection and T. cruzi infection. These sets revealed acute rejection episodes up to two weeks earlier, and trypanosome infection up to two months earlier than did histological evaluation. When applied to raw data from other institutions, the two sets of predictive genes were also able to accurately pinpoint acute rejection of lung and kidney transplants, as well as bacterial infections in kidneys. In addition to their usefulness as diagnostic tools, the data suggest that there are similarities in the biology of the processes involved in rejection of different grafts and also in the tissue responses to pathogens as diverse as bacteria and protozoa. pre-rejection: GSM47949, GSM48048, GSM49625 non-rejection: GSM47957, GSM48045, GSM48049, GSM48057, GSM48072, GSM48089, GSM48092, GSM49624, GSM49654, GSM49656, GSM49657, GSM49658, GSM49661, GSM49666, GSM49748, GSM49750, GSM49751, GSM49752, GSM49754, GSM49756, GSM49757, GSM49758, GSM49762, GSM49765, GSM49766, GSM49767, GSM49769, GSM49771, GSM49773, GSM49774, GSM49781, GSM49782, GSM49783, GSM49784 acute rejection: GSM48040, GSM48043, GSM48046, GSM48047, GSM48050, GSM48053, GSM48056, GSM49655, GSM49747, GSM49749, GSM49755, GSM49759, GSM49761, GSM49763, GSM49764, GSM49780 pre-Chagas disease reactivation: GSM48089, GSM49756, GSM49757, GSM49758, GSM49767, GSM49769, GSM49771 Chagas disease reactivation: GSM49753, GSM49760, GSM49768, GSM49772, GSM49775, GSM49776, GSM49777, GSM49778 Toxoplasma myocarditis: GSM48058 first subset ("summer"): GSM47949, GSM47957, GSM48040, GSM48043, GSM48045, GSM48046, GSM48047, GSM48048, GSM48049, GSM48050, GSM48053, GSM48056, GSM48057, GSM48058, GSM48072, GSM48089, GSM48092, GSM49624, GSM49625, GSM49654, GSM49655, GSM49656, GSM49657, GSM49658, GSM49661, GSM49666, GSM49747, GSM49748, GSM49749, GSM49750, GSM49751, GSM49752 second subset ("winter"): GSM49753, GSM49754, GSM49755, GSM49756, GSM49757, GSM49758, GSM49759, GSM49760, GSM49761, GSM49762, GSM49763, GSM49764, GSM49765, GSM49766, GSM49767, GSM49768, GSM49769, GSM49770, GSM49771, GSM49772, GSM49773, GSM49774, GSM49775, GSM49776, GSM49777, GSM49778, GSM49780, GSM49781, GSM49782, GSM49783, GSM49784 Keywords = cardiac transplant Keywords = acute rejection Keywords = infection Keywords: repeat sample This is a series that includes training and first test set of samples. Number of biological samples: 52. Eleven samples were done in replicates as identified below. RNA was isolated from endomyocardial biopsies, amplified and labeled with Cy3. Reference RNA was labeled with Cy5.