PMID- 31583655 OWN - NLM STAT- MEDLINE DCOM- 20201211 LR - 20201214 IS - 1940-6029 (Electronic) IS - 1064-3745 (Linking) VI - 2061 DP - 2020 TI - Preparing Maize Synaptonemal Complex Spreads and Sequential Immunofluorescence and Fluorescence In Situ Hybridization. PG - 79-115 LID - 10.1007/978-1-4939-9818-0_8 [doi] AB - Immunofluorescence and fluorescence in situ hybridization (FISH) can be used to locate specific proteins and DNA sequences, respectively, in chromosomes by light microscopy. Here we describe sequential use of these techniques on spreads of maize synaptonemal complexes (SCs) to determine whether crossing over can occur in knob heterochromatin. We used antibodies to AFD1, an SC protein, and MLH1, a class I (interference-sensitive) crossover protein found in most recombination nodules (RNs) to identify crossovers (COs) along SCs. Next, we used FISH to localize a 180 bp knob-specific tandem repeat. Combining immunofluorescence and FISH images of the same SC spreads showed that heterochromatic knobs do not prohibit class I COs. This technique is broadly applicable to investigations of plant prophase I chromosomes where meiotic recombination takes place. FAU - Stack, Stephen M AU - Stack SM AD - Department of Biology, Colorado State University, Fort Collins, CO, USA. Stephen.Stack@colostate.edu. FAU - Shearer, Lindsay A AU - Shearer LA AD - Department of Biology, Colorado State University, Fort Collins, CO, USA. FAU - Lohmiller, Leslie D AU - Lohmiller LD AD - Department of Biology, Colorado State University, Fort Collins, CO, USA. FAU - Anderson, Lorinda K AU - Anderson LK AD - Department of Biology, Colorado State University, Fort Collins, CO, USA. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Methods Mol Biol JT - Methods in molecular biology (Clifton, N.J.) JID - 9214969 RN - 0 (Heterochromatin) SB - IM MH - Data Analysis MH - Fluorescent Antibody Technique MH - Heterochromatin MH - Image Processing, Computer-Assisted MH - *In Situ Hybridization, Fluorescence/methods MH - Recombination, Genetic MH - *Synaptonemal Complex MH - Zea mays/*genetics OTO - NOTNLM OT - AFD1 OT - Crossing over OT - Fluorescence in situ hybridization OT - Heterochromatin OT - Immunofluorescence OT - Knobs OT - MLH1 OT - Maize OT - Recombination nodules OT - Synaptonemal complex EDAT- 2019/10/05 06:00 MHDA- 2020/12/15 06:00 CRDT- 2019/10/05 06:00 PHST- 2019/10/05 06:00 [entrez] PHST- 2019/10/05 06:00 [pubmed] PHST- 2020/12/15 06:00 [medline] AID - 10.1007/978-1-4939-9818-0_8 [doi] PST - ppublish SO - Methods Mol Biol. 2020;2061:79-115. doi: 10.1007/978-1-4939-9818-0_8.