Co-localization of CENP-C and CENP-H to discontinuous domains of CENP-A chromatin at human neocentromeres

被引:60
作者
Alonso, Alicia
Fritz, Bjoern
Hasson, Dan
Abrusan, Gyoergy
Cheung, Fanny
Yoda, Kinya
Radlwimmer, Bernhard
Ladurner, Andreas G.
Warburton, Peter E.
机构
[1] Mt Sinai Sch Med, Dept Genet & Genom Sci, New York, NY 10029 USA
[2] European Mol Biol Lab, Gene Express Unit, D-69117 Heidelberg, Germany
[3] Abbot Germany, D-65205 Wiesbaden, Germany
[4] Nagoya Univ, Biosci & Biotechnol Ctr, Chikusa Ku, Nagoya, Aichi 464, Japan
[5] Deutsch Krebsforschungszentrum, D-69120 Heidelberg, Germany
关键词
D O I
10.1186/gb-2007-8-7-r148
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Background: Mammalian centromere formation is dependent on chromatin that contains centromere protein ( CENP)-A, which is the centromere-specific histone H3 variant. Human neocentromeres have acquired CENP-A chromatin epigenetically in ectopic chromosomal locations on low-copy complex DNA. Neocentromeres permit detailed investigation of centromeric chromatin organization that is not possible in the highly repetitive alpha satellite DNA present at endogenous centromeres. Results: We have examined the distribution of CENP-A, as well as two additional centromeric chromatin-associated proteins ( CENP-C and CENP-H), across neocentromeric DNA using chromatin immunoprecipitation ( ChIP) on CHIP assays on custom genomic microarrays at three different resolutions. Analysis of two neocentromeres using a contiguous bacterial artificial chromosome ( BAC) microarray spanning bands 13q31.3 to 13q33.1 shows that both CENP-C and CENP-H co-localize to the CENP-A chromatin domain. Using a higher resolution polymerase chain reaction ( PCR)-amplicon microarray spanning the neocentromere, we find that the CENP-A chromatin is discontinuous, consisting of a major domain of about 87.8 kilobases ( kb) and a minor domain of about 13.2 kb, separated by an approximately 158 kb region devoid of CENPs. Both CENP-A domains exhibit co-localization of CENP-C and CENP-H, defining a distinct inner kinetochore chromatin structure that is consistent with higher order chromatin looping models at centromeres. The PCR microarray data suggested varying density of CENP-A nucleosomes across the major domain, which was confirmed using a higher resolution oligo-based microarray. Conclusion: Centromeric chromatin consists of several CENP-A subdomains with highly discontinuous CENP-A chromatin at both the level of individual nucleosomes and at higher order chromatin levels, raising questions regarding the overall structure of centromeric chromatin.
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