Abstract
We describe a new subfamily of human satellite III DNA that is represented on two different acrocentric chromosomes. This DNA is composed of a tandemly repeated array of diverged 5-base-pair monomer units of the sequence GGAAT or GGAGT. These monomers are organised into a 1.37-kilobase higher-order structure that is itself tandemly reiterated. Using a panel of somatic cell hybrids containing specific human chromosomes, this higher-order structure is demonstrated on chromosomes 14 and 22, but not on the remaining acrocentric chromosomes. In situ hybridisation studies have localised the sequence to the proximal p-arm region of these chromosomes. Analysis by pulsed-field gel electrophoresis (PFGE) reveals that 70-110 copies of the higher-order structure are tandemly organised on a chromosome into a major domain which appears to be flanked on both sides by non-tandemly repeated genomic DNA. In addition, some of the satellite III sequences are interspersed over a number of other PFGE fragments. This study provides fundamental knowledge on the structure and evolution of the acrocentric chromosomes, and should extend our understanding of the complex process of interchromosomal interaction which may be responsible for Robertsonian translocation and meiotic nondisjunction involving these chromosomes.
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