Cytogenetics and the Revolution of Optical Genome Mapping in the Diagnosis of Diseases

The study of chromosomal shape, characteristics, and behavior in somatic cell division (mitosis) during growth and development and in germ cell division (meiosis) during reproduction is known as cytogenetics. Many techniques can be used for cytogenetics, including fluorescent in situ hybridization (FISH), spectral karyotyping (SKY), multicolor FISH (M-FISH), microarray, and optical genome mapping (OGM). OGM is a novel genome-wide method that can identify structural variants (SVs) and copy number variants (CNVs) with only one test. Genomic structural information that is difficult to obtain with DNA sequencing can be promptly obtained with OGM, in which large molecule lengths can be mapped at a reasonable cost. OGM is increasingly being used to investigate chromosome abnormalities in genetic disorders and human cancer, but it was first utilized in genome assembly and research. According to recent research, OGM is capable of identifying every clinically significant variation seen in trials using conventional care. OGM is being utilized to identify genomic abnormalities in patients with malignancies and constitutional illnesses. It is regarded as a revolution in the field of cytogenetics. Rather than sequencing DNA, OGM relies on DNA labeling. Currently, the OGM technique with the Saphyr system from Bionano Genomics is a widely utilized platform for cytogenetic analysis. In conclusion, OGM can now be considered a highly reliable method for the identification of chromosomal abnormalities in the diagnosis of tumors and hematological diseases.