PMID- 16461583 OWN - NLM STAT- MEDLINE DCOM- 20060526 LR - 20231105 IS - 1040-4651 (Print) IS - 1532-298X (Electronic) IS - 1040-4651 (Linking) VI - 18 IP - 3 DP - 2006 Mar TI - High-resolution single-copy gene fluorescence in situ hybridization and its use in the construction of a cytogenetic map of maize chromosome 9. PG - 529-44 AB - High-resolution cytogenetic maps provide important biological information on genome organization and function, as they correlate genetic distance with cytological structures, and are an invaluable complement to physical sequence data. The most direct way to generate a cytogenetic map is to localize genetically mapped genes onto chromosomes by fluorescence in situ hybridization (FISH). Detection of single-copy genes on plant chromosomes has been difficult. In this study, we developed a squash FISH procedure allowing successful detection of single-copy genes on maize (Zea mays) pachytene chromosomes. Using this method, the shortest probe that can be detected is 3.1 kb, and two sequences separated by approximately 100 kb can be resolved. To show the robust nature of this protocol, we localized nine genetically mapped single-copy genes on chromosome 9 in one FISH experiment. Integration of existing information from genetic maps and the BAC contig-based physical map with the cytological structure of chromosome 9 provides a comprehensive cross-referenced cytogenetic map and shows the dramatic reduction of recombination in the pericentromeric heterochromatic region. To establish a feasible mapping system for maize, we also developed a probe cocktail for unambiguous identification of the 10 maize pachytene chromosomes. These results provide a starting point toward constructing a high-resolution integrated cytogenetic map of maize. FAU - Wang, Chung-Ju Rachel AU - Wang CJ AD - Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA. FAU - Harper, Lisa AU - Harper L FAU - Cande, W Zacheus AU - Cande WZ LA - eng SI - GENBANK/AF375999 SI - GENBANK/AY083961 SI - GENBANK/AY321491 SI - GENBANK/DQ351339 SI - GENBANK/DQ352544 PT - Evaluation Study PT - Journal Article PT - Research Support, U.S. Gov't, Non-P.H.S. DEP - 20060203 PL - England TA - Plant Cell JT - The Plant cell JID - 9208688 SB - IM MH - Chromosome Mapping/*methods MH - Chromosomes, Plant/*genetics MH - Cucurbita/genetics MH - Genes, Plant MH - In Situ Hybridization, Fluorescence/*methods MH - Karyotyping MH - Molecular Sequence Data MH - Multigene Family/genetics MH - Pachytene Stage/genetics MH - Zea mays/*genetics PMC - PMC1383631 EDAT- 2006/02/08 09:00 MHDA- 2006/05/27 09:00 PMCR- 2007/03/01 CRDT- 2006/02/08 09:00 PHST- 2006/02/08 09:00 [pubmed] PHST- 2006/05/27 09:00 [medline] PHST- 2006/02/08 09:00 [entrez] PHST- 2007/03/01 00:00 [pmc-release] AID - tpc.105.037838 [pii] AID - 037838 [pii] AID - 10.1105/tpc.105.037838 [doi] PST - ppublish SO - Plant Cell. 2006 Mar;18(3):529-44. doi: 10.1105/tpc.105.037838. Epub 2006 Feb 3.