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Technical Advance |




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¶
From the Graduate Program of Biochemistry, Cell and MolecularBiology,* the Brady UrologicalInstitute,
the Departments ofPathology
and Oncology,¶ The Johns Hopkins University School of Medicine, and The Johns HopkinsUniversity Bloomberg School of Public Health,|| Baltimore,Maryland; and The MathWorks Incorporated,
Natick, Massachusetts
A method was developed to assess human telomere lengths at the
individual cell level in tissue sections from standard formalin-fixed
paraffin-embedded tissues. We coupled this method with
immunofluorescence to allow the simultaneous identification of specific
cell types. Validation of this in situ quantification
method showed excellent agreement with the commonly used telomere
repeat fragment-Southern blot method. The assay requires very few cells
(
10 to 15). Thus, small tissue samples, including
clinical biopsies, can be easily accommodated. In
addition, the cells under study need not be actively cycling
and there is no requirement for tissue disaggregation or cell culture.
This method provides a more accurate assessment of telomere lengths
than Southern blotting because confounding contributions from undesired
cell types within tissue samples are avoided. Using this
technique, we were able to perform the first comparison of
relative telomere lengths in matched tumor versus normal
epithelial cells within archival human prostate
tissues.
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