Unlike more specific molecular tests, karyotyping offers a broad survey of genomic integrity, making it the first-line test for conditions like Down syndrome, Turner syndrome, and certain types of leukemia. Following the hypotonic shock, the cells are fixed in a Carnoy's solution—a mixture of methanol and acetic acid.
Preparing Karyotype Slides at Lab: Key Techniques for Optimal Chromosome Spreading
The harvesting process involves gently separating the cells from the growth medium and treating them with a hypotonic solution. Timing is crucial in this step; if the cells are exposed to the arresting agent for too long, they may degrade, while too short an exposure results in poor chromosome spreading.
The accuracy of these diagnoses is entirely dependent on how well the karyotype is prepared. Medical diagnostics and genetic research rely heavily on the ability to visualize an individual’s complete set of chromosomes, a process that begins with how a karyotype is prepared.
Steps for Preparing High-Quality Karyotype Slides in the Lab
The drop is positioned just above a slide that has been slightly heated; as the droplet makes contact, the surface tension and heat cause the cells to rupture, spreading the chromosomes across the glass. A karyotype provides a visual map of the chromosomes, arranged by size, shape, and banding pattern.
More About How is a karyotype prepared
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