5 Abstract Aims Determination of gene expression of HBG1 gamma globin in myelodysplastic syndrome (MDS) patients in CD34+ pluripotent hæmatopoietic cells and connection of HBG1 gene expression with various subtypes of MDS. Furthermore, detection of single nucleotide polymorphisms rs 4671393 and rs 11886868 in these patients and in healthy Czech population donors and to determine whether a connection exists between the occurrence of the above polymorphisms and HBG1 gene over-expression, as demonstrated in some hæmatological disorders. Samples The source of genetic material to identify gene expression were 80 HBG1 RNA samples isolated from the pluripotent hematopoietic CD34+ cells of MDS patients. As a sample of healthy controls, 6 samples of commercially purchased CD 34+ cells from the Lonza com- pany were used. The source of genetic material for the detection of polymorphisms were 140 DNA samples isolated from purified granulocytes of MDS patients and 49 samples of DNA isolated from peripheral blood granulocytes from healthy Czech population donors. Methods Real-Time PCR was used to determine HBG1 gene expression and detection of single nu- cleotide polymorphisms. Taqman Gene Expression Assay was used to determine the level of expression and the results were evaluated using the comparative ΔΔCT method....