Özet:

CD19 molecule on the B lymphocyte surface forms the CD19 complex together with CD21, CD81, CD225 in mature B cells and regulates B lymphocyte activation with antigen stimulation. Mutations that will occur in the gene encoding the CD19 molecule affect CD19 protein expression and the picture of primary immunodeficiency (PIY). In this study, we aimed to evaluate the 3-month-old baby of our patient, who was followed up with a diagnosis of CD19 deficiency, in terms of the same gene mutation using the RFLP method. The patient with known CD19 mutation, the newborn baby of this patient and the patient's mother were included in the study. First, primers covering the mutation region in the CD19 gene were designed for mutation analysis and the PCR-RFLP procedure was performed. The DNA fragments formed were imaged and genotyped in agarose gel electrophoresis. In terms of the frame shift mutation (c.973_973insA) of the CD19 gene detected in exon 6 of our patient, it was shown by the PCR-RFLP method that her baby and mother were carriers. It is concluded that the PCR-RFLP method is an inexpensive, fast and reliable method that can be used in the detection of known mutations.

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