Super-stretched pachytene chromosomes for fluorescence in situ hybridization mapping and immunodetection of DNA methylation.
Meiotic pachytene chromosome-based fluorescence in situ hybridization (FISH) mapping is one of the most important tools in plant molecular cytogenetic research. Here we report a simple technique that allows stretching of pachytene chromosomes of maize to up to at least 20 times their original size. A modified Carnoy's II fixative (6:1:3 ethanol:chloroform:acetic acid) was used in the procedure, and proved to be key for super-stretching of pachytene chromosomes. We demonstrate that super-stretched pachytene chromosomes provide unprecedented resolution for chromosome-based FISH mapping. DNA probes separated by as little as 50 kb can be resolved on super-stretched chromosomes. A combination of FISH with immunofluorescent detection of 5-methyl cytosine on super-stretched pachytene chromosomes provides a powerful tool to reveal DNA methylation of specific chromosomal domains, especially those associated with highly repetitive DNA sequences.
Koo
Dal-Hoe
DH
Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA.
Jiang
Jiming
J
D044503:5-Methylcytosine; D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant; D019175:DNA Methylation; D018744:DNA, Plant / Q000235:genetics; D018745:Genome, Plant; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D003313:Zea mays / Q000235:genetics
D018744:DNA, Plant; D044503:5-Methylcytosine