Abstract
We have analyzed more than 500 alphoid monomers either sequenced in our laboratory or available in the literature. Most of them belonged to the well studied suprachromosomal families 1, 2 and 3 characterized by dimeric (1 and 2) and pentameric (3) ancestral periodicities. The sequences that did not belong to the previously known families were subjected to further analysis. About a half of them formed a relatively homogenous family. Its members were on average 80.5% identical and 89.5% homologous to the M1 consensus sequence derived from this group (39 monomers). In the genome they do not form any ancestral periodicities other than a monomeric one, and are found at least in chromosomes 13, 14, 15, 21, 22 and Y. The newly defined family was termed suprachromosomal family 4. Comparison of all 10 alphoid monomeric groups identified so far showed that the M1 sequence is closely related to the J1-D2-W4-W5 homology grouping. Notably the African Green Monkey alpha satellite, also characterized by monomeric construction, appears to be a member of the same group.
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