Identification of a telomeric DNA sequence in Plasmodium berghei.

A fragment of Plasmodium berghei DNA was cloned using a technique designed to select for telomeric sequences. The cloned fragment recognizes Bal31-sensitive bands in P. berghei genomic digests. It contains at its distal end at least 70 tandem repeats of the heptanucleotide sequence CCCTGAAA. The presence of natural single strand discontinuities in the telomeric regions of P. berghei DNA is demonstrated by the selective incorporation of deoxyribonucleoside triphosphates in the absence of DNase. The number of copies of the cloned sequence present in each genome agrees with an estimate of 6-12 chromosomes per nucleus.