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. 1996 Feb 6;93(3):1298–1302. doi: 10.1073/pnas.93.3.1298

A compositional map of human chromosome band Xq28.

A De Sario 1, E M Geigl 1, G Palmieri 1, M D'Urso 1, G Bernardi 1
PMCID: PMC40074  PMID: 8577758

Abstract

The molar fractions of guanine plus cytosine (GC) in DNA were determined for 36 yeast artificial chromosomes (YACs) which almost completely cover human chromosome band Xq28, a terminal reverse band, corresponding to about 8 Mb of DNA. This allowed the construction of the most complete compositional map to date of a chromosomal band; three regions were observed: (i) a proximal 3.5-Mb region formed by GC-poor L and GC-rich H1 isochores; (ii) a middle 2,2-Mb region essentially formed by a GC-rich H2 isochore and a very GC-rich H3 isochore separated by a GC-poor L isochore, YACs from this region being characterized by a striking compositional heterogeneity and instability; and (iii) a distal 1.3-Mb region exclusively formed by GC-poor L isochores. Gene and CpG island concentrations increased with the GC levels of the isochores, as expected. Xq28 exemplifies a subset of reverse bands which are different from the two other subsets, namely from telomeric bands, which are characterized by specific cytogenetic properties and by the predominance of H2 and H3 isochores, and from the majority of reverse bands, which do not contain H2 and H3 isochores.

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Selected References

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