PMID- 12750341 OWN - NLM STAT- MEDLINE DCOM- 20040130 LR - 20210915 IS - 0016-6731 (Print) IS - 0016-6731 (Linking) VI - 164 IP - 1 DP - 2003 May TI - Cloning and characterization of maize B chromosome sequences derived from microdissection. PG - 299-310 AB - Isolation of sequences from the maize B chromosome is always hampered by its high homology with the normal complements. In this study, this handicap was overcome by cloning the sequences from the pachytene B chromosomes dissected out of a slide by a micromanipulator followed by degenerate oligonucleotide-primed PCR. The isolated sequences were found to hybridize with genomic DNA in a B-dosage-dependent manner and with the pachytene B chromosome by fluorescence in situ hybridization (FISH), corroborating their B origin. A total of 19 B sequences were isolated, all of which are repetitive and, with one exception, are homologous to the A chromosome(s). Three sequences have strong homology to maize sequences that include two knob repeats and one zein gene (noncoding region), and 10 others are homologous to the noncoding region of Adh1, Bz1, Gag, Zein, and B centromere to a lesser degree. Six sequences have no homology to any gene. In addition to FISH, the B-specific sequence and a partially B-specific one were also mapped, by seven newly characterized TB-10L translocations, to a similar location on the central portion of the distal heterochromatic region, spreading over a region of about one-third of the B chromosome. FAU - Cheng, Ya-Ming AU - Cheng YM AD - Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan, Republic of China. FAU - Lin, Bor-Yaw AU - Lin BY LA - eng SI - GENBANK/BH814952 SI - GENBANK/BH814953 SI - GENBANK/BH814954 SI - GENBANK/BH814955 SI - GENBANK/BH814957 SI - GENBANK/BH814958 SI - GENBANK/BH814959 SI - GENBANK/BH814960 SI - GENBANK/BH814961 SI - GENBANK/BH814962 SI - GENBANK/BH814963 SI - GENBANK/BH814964 SI - GENBANK/BH814965 SI - GENBANK/BH814966 SI - GENBANK/BH814967 SI - GENBANK/BH814968 SI - GENBANK/BH814969 SI - GENBANK/BH814970 SI - GENBANK/BH814971 SI - GENBANK/BH814972 SI - GENBANK/BH814973 SI - GENBANK/BH814974 SI - GENBANK/BH814975 SI - GENBANK/BH814976 SI - GENBANK/BH814977 PT - Journal Article PL - United States TA - Genetics JT - Genetics JID - 0374636 SB - IM MH - Blotting, Southern MH - *Chromosomes MH - In Situ Hybridization, Fluorescence MH - *Microdissection MH - Molecular Sequence Data MH - *Sequence Analysis, DNA MH - Translocation, Genetic MH - Zea mays/*genetics PMC - PMC1462555 EDAT- 2003/05/17 05:00 MHDA- 2004/01/31 05:00 PMCR- 2003/08/01 CRDT- 2003/05/17 05:00 PHST- 2003/05/17 05:00 [pubmed] PHST- 2004/01/31 05:00 [medline] PHST- 2003/05/17 05:00 [entrez] PHST- 2003/08/01 00:00 [pmc-release] AID - 10.1093/genetics/164.1.299 [doi] PST - ppublish SO - Genetics. 2003 May;164(1):299-310. doi: 10.1093/genetics/164.1.299.