The quality of DNA isolated from autopsy formalin-fixed and formalin-fixed paraffin-embedded tissues: study of 1662 samples.
DNA
Integrity
PCR
Purity
Spectrophotomer
Yield
Journal
Molecular biology reports
ISSN: 1573-4978
Titre abrégé: Mol Biol Rep
Pays: Netherlands
ID NLM: 0403234
Informations de publication
Date de publication:
Aug 2023
Aug 2023
Historique:
received:
05
01
2023
accepted:
26
04
2023
medline:
31
7
2023
pubmed:
13
6
2023
entrez:
13
6
2023
Statut:
ppublish
Résumé
There are enormous formalin-fixed paraffin-embedded tissue archives and a constantly growing number of methods for molecular analyses but, the isolation of DNA from this tissue is still challenging due to the damaging effect of formalin on DNA. To determine the extent to which DNA purity, yield and integrity depend on the process of fixation in formalin, and to what extent on the process of tissue paraffin embedding, we compared the quality of DNA isolated from fixed tissues and DNA isolated from tissues embedded in paraffin blocks after fixation. Heart, liver and brain tissues obtained from healthy people who suddenly died a violent death were fixed in 10% buffered formalin as well as in 4% unbuffered formalin for 6 h, 1-7 days (every 24 h), 10, 14, 28 days and 2 months. Additionally, the same tissues were fixed in 4% unbuffered formalin embedded in a paraffin block and stored from a few months to 30 years. The yield and purity of the DNA samples isolated from these tissues were measured using spectrophotometry. PCR amplification of the hTERT gene was performed to evaluate the degree of DNA fragmentation. Although the purity of the DNA isolated from almost all tissue samples was satisfactory, the DNA yields changed significantly. There was a decrease in successful PCR amplification of the hTERT gene in DNA samples isolated from tissue fixed in buffered and unbuffered formalin for up to 2 months from 100% to 8.3%. Archiving the tissue in paraffin blocks for up to 30 years also impacts the integrity of DNA, so there was a decrease in PCR amplification of the hTERT gene from 91% success to 3%. The largest decrease in DNA yield was observed after tissue formalin fixation after 14 days of fixation in buffered and unbuffered formalin. DNA integrity depends on the time of tissue formalin fixation, especially after 6 days for tissue fixed in unbuffered formalin, while for tissue fixed in buffered formalin the time is prolonged up to 28 days. The age of paraffin blocks also impacted DNA integrity, after 1 year and 16 years of archiving the paraffin blocks of tissues, there was a decrease in the success of PCR amplification.
Sections du résumé
BACKGROUND
BACKGROUND
There are enormous formalin-fixed paraffin-embedded tissue archives and a constantly growing number of methods for molecular analyses but, the isolation of DNA from this tissue is still challenging due to the damaging effect of formalin on DNA. To determine the extent to which DNA purity, yield and integrity depend on the process of fixation in formalin, and to what extent on the process of tissue paraffin embedding, we compared the quality of DNA isolated from fixed tissues and DNA isolated from tissues embedded in paraffin blocks after fixation.
METHODS AND RESULTS
RESULTS
Heart, liver and brain tissues obtained from healthy people who suddenly died a violent death were fixed in 10% buffered formalin as well as in 4% unbuffered formalin for 6 h, 1-7 days (every 24 h), 10, 14, 28 days and 2 months. Additionally, the same tissues were fixed in 4% unbuffered formalin embedded in a paraffin block and stored from a few months to 30 years. The yield and purity of the DNA samples isolated from these tissues were measured using spectrophotometry. PCR amplification of the hTERT gene was performed to evaluate the degree of DNA fragmentation. Although the purity of the DNA isolated from almost all tissue samples was satisfactory, the DNA yields changed significantly. There was a decrease in successful PCR amplification of the hTERT gene in DNA samples isolated from tissue fixed in buffered and unbuffered formalin for up to 2 months from 100% to 8.3%. Archiving the tissue in paraffin blocks for up to 30 years also impacts the integrity of DNA, so there was a decrease in PCR amplification of the hTERT gene from 91% success to 3%.
CONCLUSION
CONCLUSIONS
The largest decrease in DNA yield was observed after tissue formalin fixation after 14 days of fixation in buffered and unbuffered formalin. DNA integrity depends on the time of tissue formalin fixation, especially after 6 days for tissue fixed in unbuffered formalin, while for tissue fixed in buffered formalin the time is prolonged up to 28 days. The age of paraffin blocks also impacted DNA integrity, after 1 year and 16 years of archiving the paraffin blocks of tissues, there was a decrease in the success of PCR amplification.
Identifiants
pubmed: 37310548
doi: 10.1007/s11033-023-08491-5
pii: 10.1007/s11033-023-08491-5
doi:
Substances chimiques
Formaldehyde
1HG84L3525
Paraffin
8002-74-2
DNA
9007-49-2
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6323-6336Subventions
Organisme : Faculty of Medical Sciences, University of Kragujevac, Serbia
ID : JP: 05/13
Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer Nature B.V.
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