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. 1991 Jan 25;19(2):271–277. doi: 10.1093/nar/19.2.271

Four distinct alpha satellite subfamilies shared by human chromosomes 13, 14 and 21.

B Vissel 1, K H Choo 1
PMCID: PMC333590  PMID: 2014167

Abstract

We describe the characterisation of four alpha satellite sequences which are found on a subset of the human acrocentric chromosomes. Direct sequence study, and analysis of somatic cell hybrids carrying specific human chromosomes indicate a unique 'higher-order structure' for each of the four sequences, suggesting that they belong to different subfamilies of alpha DNA. Under very high stringency of Southern hybridisation conditions, all four subfamilies were detected on chromosomes 13, 14 and 21, with 13 and 21 showing a slightly greater sequence homology in comparison to chromosome 14. None of these subfamilies were detected on chromosomes 15 and 22. In addition, we report preliminary evidence for a new alphoid subfamily that is specific for human chromosome 14. These results, together with those of earlier published work, indicate that the centromeres of the five acrocentric chromosomes are characterised by a number of clearly defined alphoid subfamilies or microdomains (with at least 5, 7, 3, 5 and 2 different ones on chromosomes 13, 14, 15, 21 and 22, respectively). These microdomains must impose a relatively stringent subregional pairing of the centromeres of two homologous chromosomes. The different alphoid subfamilies reported should serve as useful markers to allow further 'dissection' of the structure of the human centromere as well as the investigation of how the different nonhomologous chromosomes may interact in the aetiology of aberrations involving these chromosomes.

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Selected References

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