Organization of the KpnI family of chromosomal distal-end satellite DNAs in Silene latifolia.
The major satellite DNAs of the dioecious plant Silene latifolia are represented by the repetitive sequences X43.1, RMY1 and members of the SacI family, which are located at the distal ends of chromosomes. To characterize the satellite DNAs at the distal ends of the chromosomes in S. latifolia ( Sl-distal-satDNA), we isolated a bacterial artificial chromosome clone (number 15B12) that contained multiple repeat sequences with KpnI restriction sites, and subcloned a portion of this sequence into a plasmid vector. Sequencing analysis confirmed that recognition or degenerate sites for KpnI were repeated 26 times at intervals of 310-324 bp in the inserted DNA. The phylogenetic tree that was constructed with the 26 KpnI repeat units contained clustered branches that were independent of the SacI family. It is clear that the KpnI repeat belongs to an Sl-distal-satDNA family that is distinct from the SacI family. We designated this family as " KpnI" after the restriction enzyme that does not have a site in the SacI family. Multi-colored fluorescent in situ hybridization was performed with the KpnI family and RMY1 probes under high stringency conditions. The results suggest that chromosome 7 is unique and that it carries the KpnI family at only one end.
Kazama
Yusuke
Y
Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8562, Japan. kk16510@mail.ecc.u-tokyo.ac.jp
Sugiyama
Ryuji
R
Matsunaga
Sachihiro
S
Shibata
Fukashi
F
Uchida
Wakana
W
Hizume
Masahiro
M
Kawano
Shigeyuki
S
D001483:Base Sequence; D002874:Chromosome Mapping; D022202:Chromosomes, Artificial, Bacterial; D032461:Chromosomes, Plant; D018744:DNA, Plant / Q000145:classification; D004276:DNA, Satellite / Q000145:classification; D015252:Deoxyribonucleases, Type II Site-Specific; D017404:In Situ Hybridization, Fluorescence; D008969:Molecular Sequence Data; D010802:Phylogeny; D010957:Plasmids; D029751:Silene / Q000235:genetics*
D018744:DNA, Plant; D004276:DNA, Satellite; D015252:Deoxyribonucleases, Type II Site-Specific; C029312:GGTACC-specific type II deoxyribonucleases