Describe the applications of oligonucleotide probes.

Oligonucleotide probes are short, synthetic strands of nucleic acids (DNA or RNA) that are designed to hybridize with complementary sequences in a target molecule. They are a crucial tool in molecular biology and recombinant DNA technology due to their specificity and versatility. These probes have numerous applications, especially in diagnostics, research, and genetic engineering.

One of the primary applications of oligonucleotide probes is in molecular diagnostics. In this context, they are used for detecting specific sequences of DNA or RNA that indicate the presence of genetic diseases, pathogens, or cancerous cells. For example, oligonucleotide probes can be used in techniques such as fluorescent in situ hybridization (FISH) to detect chromosomal abnormalities, or in polymerase chain reaction (PCR)-based assays to identify specific genetic mutations. The probes bind to their complementary target sequences, and the detection of the probe-target hybrid signals the presence of the disease or pathogen.

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