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Genetics Society of America's GENETICS journal highlights for May 2013

a mechanism known as meiotic silencing by unpaired DNA (MSUD). Two articles in this issue of GENETICS report the identification of novel players in this process, including small RNAs and the first nuclear MSUD protein. This protein is not required for meiosis, providing the first indication that MSUD is not necessarily coupled to sexual development.  

Genome Integrity and Transmission
Intragenomic conflict between the two major knob repeats of maize, pp. 81-89
L. B. Kanizay, P. S. Albert, J. A. Birchler, and R. K. Dawe
Large genomes are often replete with tandem repeats. Why do they exist? Here the authors investigate the distribution of tandem repeats in maize heterochromatic domains called knobs. The data suggest an intragenomic conflict whereby one family of repeats suppresses proliferation of the other. Similar competition may underlie the formation and maintenance of many tandem repeat arrays.

Genome Integrity and Transmission
Nonrandom distribution of interhomolog recombination events induced by breakage of a dicentric chromosome in Saccharomyces cerevisiae, pp. 69-80
W. Song, M. Gawel, M. Dominska, P. W. Greenwell, E. Hazkani-Covo, K. Bloom, and T. D. Petes
This article presents the first high-resolution mapping of the positions of chromosome breaks that result from the bridge-fusion-breakage cycles of dicentric chromosomes. Sites of recombination between a dicentric chromosome and its normal homolog revealed the locations of breaks in the dicentric chromosome, which were distributed in a quasi-random fashion between the two centromeres.

Genetics of Complex Traits
Systems genetics of environmental response in the mature wheat embryo, pp. 265-277
J. D. Munkvold, D. Laudencia-Chingcuanco, and M. E. Sorrells
This article illustrates the utility of network approaches for understanding gene expression by environment interaction, even in organisms with

Contact: Phyllis Edelman
Genetics Society of America

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