In situ hybridization is best described as a technique used to localize nucleic acids within which context?

In situ hybridization is best described as a technique used to localize nucleic acids within which context?

• A. Fixed tissue sections
• B. Liquid cell suspensions
• C. Blood plasma
• D. Live tissue culture

Answer: (A)

In situ hybridization is used to detect a specific nucleic acid sequence right where it resides in the tissue, preserving the cells’ and tissue’s structure. A labeled probe binds to its complementary DNA or RNA inside cells that have been fixed, so the spatial pattern of expression or localization can be seen within the intact tissue architecture. This approach relies on fixed tissue sections (such as formalin-fixed, paraffin-embedded or frozen sections) to maintain morphology while allowing probe access, making it possible to tell which cells or regions contain the target sequence. Because the method depends on preserving and examining tissue structure, it isn’t performed on fluid samples or live cells without fixation. Thus, fixed tissue sections are the appropriate context for localizing nucleic acids with in situ hybridization.

In situ hybridization is used to detect a specific nucleic acid sequence right where it resides in the tissue, preserving the cells’ and tissue’s structure. A labeled probe binds to its complementary DNA or RNA inside cells that have been fixed, so the spatial pattern of expression or localization can be seen within the intact tissue architecture. This approach relies on fixed tissue sections (such as formalin-fixed, paraffin-embedded or frozen sections) to maintain morphology while allowing probe access, making it possible to tell which cells or regions contain the target sequence. Because the method depends on preserving and examining tissue structure, it isn’t performed on fluid samples or live cells without fixation. Thus, fixed tissue sections are the appropriate context for localizing nucleic acids with in situ hybridization.