Preparation of DNA from cytological material: Effects of Fixation, Staining, and Mounting Medium on DNA Yield and Quality.
(2013) In Cancer Cytopathology 121(7). p.344-353- Abstract
- BACKGROUND: Personalized oncology requires molecular analysis of tumor cells. Several studies have demonstrated that cytological material is suitable for DNA analysis, but to the authors' knowledge there are no systematic studies comparing how the yield and quality of extracted DNA is affected by the various techniques used for the preparation of cytological material. METHODS: DNA yield and quality were compared using cultured human lung cancer cells subjected to different preparation techniques used in routine cytology, including fixation, mounting medium, and staining. The results were compared with the outcome of epidermal growth factor receptor (EGFR) genotyping of 66 clinical cytological samples using the same DNA preparation... (More)
- BACKGROUND: Personalized oncology requires molecular analysis of tumor cells. Several studies have demonstrated that cytological material is suitable for DNA analysis, but to the authors' knowledge there are no systematic studies comparing how the yield and quality of extracted DNA is affected by the various techniques used for the preparation of cytological material. METHODS: DNA yield and quality were compared using cultured human lung cancer cells subjected to different preparation techniques used in routine cytology, including fixation, mounting medium, and staining. The results were compared with the outcome of epidermal growth factor receptor (EGFR) genotyping of 66 clinical cytological samples using the same DNA preparation protocol. RESULTS: All tested protocol combinations resulted in fragment lengths of at least 388 base pairs. The mounting agent EcoMount resulted in higher yields than traditional xylene-based medium. Spray and ethanol fixation resulted in both a higher yield and better DNA quality than air drying. In liquid-based cytology (LBC) methods, CytoLyt solution resulted in a 5-fold higher yield than CytoRich Red. Papanicolaou staining provided twice the yield of hematoxylin and eosin staining in both liquid-based preparations. Genotyping outcome and quality control values from the clinical EGFR genotyping demonstrated a sufficient amount and amplifiability of DNA in both spray-fixed and air-dried cytological samples. CONCLUSIONS: Reliable clinical genotyping can be performed using all tested methods. However, in the cell line experiments, spray- or ethanol-fixed, Papanicolaou-stained slides provided the best results in terms of yield and fragment length. In LBC, the DNA recovery efficiency of the preserving medium may differ considerably, which should be taken into consideration when introducing LBC. Cancer (Cancer Cytopathol) 2013. © 2013 American Cancer Society. (Less)
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https://lup.lub.lu.se/record/3559801
- author
- Dejmek, Annika LU ; Zendehrokh, Nooreldin LU ; Tomaszewska, Malgorzata and Edsjö, Anders LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Cancer Cytopathology
- volume
- 121
- issue
- 7
- pages
- 344 - 353
- publisher
- Wiley-Blackwell
- external identifiers
-
- wos:000321698500003
- pmid:23408720
- scopus:84884739060
- ISSN
- 1934-6638
- DOI
- 10.1002/cncy.21276
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Molecular Medicine (013031200), Pathology (Malmö) (013031000)
- id
- 6d797754-32f6-4010-ac4b-e6b851ae7596 (old id 3559801)
- alternative location
- http://www.ncbi.nlm.nih.gov/pubmed/23408720?dopt=Abstract
- date added to LUP
- 2016-04-01 10:41:37
- date last changed
- 2022-04-28 00:27:50
@article{6d797754-32f6-4010-ac4b-e6b851ae7596,
abstract = {{BACKGROUND: Personalized oncology requires molecular analysis of tumor cells. Several studies have demonstrated that cytological material is suitable for DNA analysis, but to the authors' knowledge there are no systematic studies comparing how the yield and quality of extracted DNA is affected by the various techniques used for the preparation of cytological material. METHODS: DNA yield and quality were compared using cultured human lung cancer cells subjected to different preparation techniques used in routine cytology, including fixation, mounting medium, and staining. The results were compared with the outcome of epidermal growth factor receptor (EGFR) genotyping of 66 clinical cytological samples using the same DNA preparation protocol. RESULTS: All tested protocol combinations resulted in fragment lengths of at least 388 base pairs. The mounting agent EcoMount resulted in higher yields than traditional xylene-based medium. Spray and ethanol fixation resulted in both a higher yield and better DNA quality than air drying. In liquid-based cytology (LBC) methods, CytoLyt solution resulted in a 5-fold higher yield than CytoRich Red. Papanicolaou staining provided twice the yield of hematoxylin and eosin staining in both liquid-based preparations. Genotyping outcome and quality control values from the clinical EGFR genotyping demonstrated a sufficient amount and amplifiability of DNA in both spray-fixed and air-dried cytological samples. CONCLUSIONS: Reliable clinical genotyping can be performed using all tested methods. However, in the cell line experiments, spray- or ethanol-fixed, Papanicolaou-stained slides provided the best results in terms of yield and fragment length. In LBC, the DNA recovery efficiency of the preserving medium may differ considerably, which should be taken into consideration when introducing LBC. Cancer (Cancer Cytopathol) 2013. © 2013 American Cancer Society.}},
author = {{Dejmek, Annika and Zendehrokh, Nooreldin and Tomaszewska, Malgorzata and Edsjö, Anders}},
issn = {{1934-6638}},
language = {{eng}},
number = {{7}},
pages = {{344--353}},
publisher = {{Wiley-Blackwell}},
series = {{Cancer Cytopathology}},
title = {{Preparation of DNA from cytological material: Effects of Fixation, Staining, and Mounting Medium on DNA Yield and Quality.}},
url = {{http://dx.doi.org/10.1002/cncy.21276}},
doi = {{10.1002/cncy.21276}},
volume = {{121}},
year = {{2013}},
}