Molecular Pathology

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Molecular Pathology 2003;56:184-186
© 2003 BMJ Publishing Group & Association of Clinical Pathologists


SHORT REPORT

PCR analysis in archival postmortem tissues

S Bonin1, F Petrera1, B Niccolini1 and G Stanta2

1 ICGEB, International Centre for Genetic Engineering and Biotechnology, 99 Padriciano, 34012 Trieste, Italy
2 Department of Clinical, Morphological and Technological Sciences, University of Trieste, Cattinara Hospital, 447 Strada di Fiume, 34149 Trieste, Italy

Correspondence to:
Dr G Stanta, ICGEB, International Centre for Genetic Engineering and Biotechnology, 99 Padriciano, 34012 Trieste, Italy;
stanta{at}icgeb.org


ABSTRACT
Background: Formalin fixed and paraffin wax embedded tissues of necropsy origin are an important source for molecular analysis especially in rare diseases, neuropathology, or molecular epidemiology studies. Because of DNA degradation, only short sequences can be amplified from this type of tissue, very often less than 100 bases. This poses problems because studies on polymorphism and mutations occurring in large genes often require the analysis of long sequences.

Methods: The development of a simple treatment to obtain longer fragments of DNA for the analysis of archival postmortem paraffin wax embedded tissues.

Results: It was possible to amplify longer sequences ranging up to 300 bases from postmortem tissues, with no modification to the usual DNA extraction procedures. To obtain longer stretches of DNA, a pre-PCR restoration treatment was required, by filling single strand breaks, followed by a vigorous denaturation step.

Conclusions: The development of this simple treatment allowed the analysis of longer fragments of DNA obtained from archival postmortem paraffin wax embedded tissues.


Keywords: formalin fixed paraffin embedded tissues; polymerase chain reaction; DNA degradation; postmortem tissues

Abbreviations: ApoE, apolipoprotein E; PCR, polymerase chain reaction




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