Abstract
We have cloned and determined the base-sequence and genome organization of two human chromosome-specific alphoid DNA fragments, designated L1.26, mapping principally to chromosomes 13 and 21, and L1.84, mapping to chromosome 18. Their copy number is estimated to be approximately 2,000 per haploid genome. L1.84 has a double-dimer organization, whereas L1.26 has a much less defined higher order tandem organization. Further, we present evidence that the restriction-site spacing within the alphoid DNA family is chromosome specific. From sequence analysis, clones L1.26 and L1.84 are found to consist of 5 and 4 tandemly duplicated 170 bp monomers. Cross-homology between the various monomers is 65-85%. The analysis suggests that the evolution of tandem-arrays does not take place via a defined 340 bp unit, as was inferred by others, but via circularly permutated monomers or multimers of the 170 bp unit.
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