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Chromosome‐specific segmentation revealed by structural analysis of individually isolated chromosomes
Author(s) -
Kitada Kunio,
Taima Akira,
Ogasawara Kiyomoto,
Metsugi Shouichi,
Aikawa Satoko
Publication year - 2011
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/gcc.20847
Subject(s) - biology , chromosome , genetics , karyotype , comparative genomic hybridization , chromosome regions , microbiology and biotechnology , gene
Analysis of structural rearrangements at the individual chromosomal level is still technologically challenging. Here we optimized a chromosome isolation method using fluorescent marker‐assisted laser‐capture and laser‐beam microdissection and applied it to structural analysis of two aberrant chromosomes found in a lung cancer cell line. A high‐density array‐comparative genomic hybridization (array‐CGH) analysis of DNA samples prepared from each of the chromosomes revealed that these two chromosomes contained 296 and 263 segments, respectively, ranging from 1.5 kb to 784.3 kb in size, derived from different portions of chromosome 8. Among these segments, 242 were common in both aberrant chromosomes, but 75 were found to be chromosome‐specific. Sequences of 263 junction sites connecting the ends of segments were determined using a PCR/Sanger‐sequencing procedure. Overlapping microhomologies were found at 169 junction sites. Junction partners came from various portions of chromosome 8 and no biased pattern in the positional distribution of junction partners was detected. These structural characteristics suggested the occurrence of random fragmentation of the entire chromosome 8 followed by random rejoining of these fragments. Based on that, we proposed a model to explain how these aberrant chromosomes are formed. Through these structural analyses, it was demonstrated that the optimized chromosome isolation method described here can provide high‐quality chromosomal DNA for high resolution array‐CGH analysis and probably for massively parallel sequencing analysis. © 2011 Wiley‐Liss, Inc.