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Vol. 10, Issue 5, 597-610, May 2000

REVIEW
Structure of Chromosomal Duplicons and their Role in Mediating Human Genomic Disorders

Yonggang Ji,1 Evan E. Eichler, Stuart Schwartz, and Robert D. Nicholls2

Department of Genetics, Case Western Reserve University School of Medicine, and Center for Human Genetics, University Hospitals of Cleveland, Cleveland, Ohio 44106 USA

Chromosome-specific low-copy repeats, or duplicons, occur in multiple regions of the human genome. Homologous recombination between different duplicon copies leads to chromosomal rearrangements, such as deletions, duplications, inversions, and inverted duplications, depending on the orientation of the recombining duplicons. When such rearrangements cause dosage imbalance of a developmentally important gene(s), genetic diseases now termed genomic disorders result, at a frequency of 0.7-1/1000 births. Duplicons can have simple or very complex structures, with variation in copy number from 2 to >10 repeats, and each varying in size from a few kilobases in length to hundreds of kilobases. Analysis of the different duplicons involved in human genomic disorders identifies features that may predispose to recombination, including large size and high sequence identity between the recombining copies, putative recombination promoting features, and the presence of multiple genes/pseudogenes that may include genes expressed in germ cells. Most of the chromosome rearrangements involve duplicons near pericentromeric regions, which may relate to the propensity of such regions to accumulate duplicons. Detailed analyses of the structure, polymorphic variation, and mechanisms of recombination in genomic disorders, as well as the evolutionary origin of various duplicons will further our understanding of the structure, function, and fluidity of the human genome.

1 Present address: Genentech, Inc., Department of Bioinformatics, South San Francisco, California 94080 USA.

2 Corresponding author.

10:597-610 ©2000 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/00 $5.00
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