Quality of DNA extracted from formalin-fixed, paraffin-embedded canine tissues.

Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc
Jonathan D DearDanika L Bannasch

Abstract

Veterinary pathology tissue banks are valuable resources for genetic studies. However, limited data exist as to whether quality DNA can be extracted from these tissues for use in canine genotyping studies. We extracted DNA from 44 formalin-fixed, paraffin-embedded (FFPE) tissue blocks from dogs; 9 of these dogs had DNA available from whole blood samples that had been banked. We genotyped DNA from 30 of 44 tissue blocks and 9 whole blood samples on the Illumina CanineHD BeadChip; DNA quality was insufficient in 14 of 44 samples from tissue blocks. There was significant correlation between the 260/280 ratio and single-nucleotide variation (SNV) call rate (p = 0.0276; r2 = 0.162); 23 of 30 samples from FFPE were genotyped with > 65% call rates. Median pairwise identical-by-state (IBS) analysis was 0.99 in 8 pairs of dogs with call rates > 65%. Neither age of tissue block nor specific tissue types were associated with significant differences in DNA concentration, 260/280 ratio, or SNV call rate. DNA extracted from tissue blocks can have variable quality, although comparable levels of homozygosity suggest that extracts from FFPE with call rates > 65% might provide similar results to samples from whole blood when analyzed on the Illu...Continue Reading

References

Dec 13, 2005·Nature·Kerstin Lindblad-TohEric S Lander
Jul 30, 2008·Genes, Chromosomes & Cancer·Marianne TuefferdSophie Camilleri-Broët
Sep 17, 2015·Animal Genetics·Barbara GandolfiLeslie A Lyons
Jan 23, 2016·Nature Communications·Jessica J HaywardAdam R Boyko

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Citations

Aug 28, 2021·Experimental and Therapeutic Medicine·Nenghua ZhangGengqian Zhang

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Methods Mentioned

BETA
PCR
genotyping
biopsy

Software Mentioned

SAS
Plink

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