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In vivo sister chromatid exchanges in the euchromatin and constitutive heterochromatin of the Indian mole rat, Nesokia indica.

Distribution of in vivo SCEs in euchromatin and constitutive heterochromatin of Nesokia indica has been studied. The distinct partitioning of the euchromatin and constitutive heterochromatin into different arms of the large X chromosome greatly facilitates such a comparison. The constitutive heterochromatin showed a higher SCE rate per unit length than the total euchromatin. However, between the two types of chromatin in the X itself there was no significant difference. These values were also comparable to that observed for the largest autosome. This study suggests that factor(s) other than chromatin condensation, DNA base composition, and DNA replication kinetics is (are) responsible for the formation of SCEs.