In situ chromosome preparation technique for simultaneous cytogenetic and immunocytochemical studies on cell cultures of solid tumors

Detection of numerical karyotype changes in the giant cells of Hodgkin's lymphomas by a combination of FISH and immunohistochemistry applied to paraffin sections

Conventional karyotyping of Hodgkin's disease (HD) has until now yielded only limited insight into karyotypic characteristics of this disease. For this reason, fluorescence in situ hybridization (FISH) using alpha-satellite chromosome-specific probes was applied to paraffin sections of HD tumors in order to verify numerical aberrations suggested to be specific for HD in the literature. The FISH technique was combined with immunohistochemical detection of the CD30 antigen to allow easier identification of the Reed-Sternberg and Hodgkin (RS&H) cells. The number of specific FISH signals per nucleus was determined both in CD30-positive RS&H cells as well as in non-malignant "bystander" cells in order to assess differences in the signal distribution. Contrasted with normal lymphoid cells, the tumor cells in HD were found to be polysomic for at least one of the chromosomes analyzed (1,2,4, and 8). The technique described is a reliable method for confirmation of results obtained from conventional cytogenetics, which is especially suited for archival material or samples not containing dividing cells.

Analysis of genotype and phenotype on the same interphase or mitotic cell. A manual of MAC (morphology antibody chromosomes) methodology

The purpose of this paper is to serve as a MAC (Morphology Antibody Chromosome) manual describing combined methodologies that allow simultaneous and/or sequential analysis of cell morphology, immunophenotype, and banded chromosomes and/or in situ hybridization signals. The MAC techniques used at the Department of Medical Genetics of the University of Helsinki, Finland, are described and modifications or related techniques reported by other authors are discussed. A list of references concerning applications is also given.