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THE PLANT CELL, Vol 4, Issue 8 953-960, Copyright © 1992 by American Society of Plant Biologists
Pinning Down Loose Ends: Mapping Telomeres and Factors Affecting Their Length
B. Burr, F. A. Burr, E. C. Matz and J. Romero-Severson
Biology Department, Brookhaven National Laboratory, Upton, New York 11973
A degenerately repeated sequence, proximal to the telomere heptanucleotide
repeat in maize, contains restriction enzyme sites that permit the
separation of telomeres from the rest of the chromosomes. Probing with a
telomere-specific oligonucleotide revealed genotype-dependent telomere
lengths that vary more than 25-fold in maize among the 22 inbreds that have
been surveyed. These lengths were found to segregate reproducibly in a
recombinant inbred family where 50% of the variation can be accounted for
by three loci. The dynamic control over telomere length in maize appears to
act rapidly to achieve new genotypically determined telomere lengths in the
F1. Clones of telomere proximal sequences were used to map restriction
fragment length loci at the distal ends of eight of 20 chromosome arms.
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