Affiliation:
1. School of Biological Sciences and Center for Cell and Genome Sciences, The University of Utah, Salt Lake City, UT 84112
Abstract
Successful chromosome segregation into gametes depends on tightly regulated interactions between the parental chromosomes. During meiosis, chromosomes are aligned end-to-end by an interface called the synaptonemal complex, which also regulates exchanges between them. However, despite the functional and ultrastructural conservation of this essential interface, how protein–protein interactions within the synaptonemal complex regulate chromosomal interactions remains poorly understood. Here, we describe a genetic interaction in the
C. elegans
synaptonemal complex, comprised of short segments of three proteins, SYP-1, SYP-3, and SYP-4. We identified the interaction through a saturated suppressor screen of a mutant that destabilizes the synaptonemal complex. The specificity and tight distribution of suppressors suggest a charge-based interface that promotes interactions between synaptonemal complex subunits and, in turn, allows intimate interactions between chromosomes. Our work highlights the power of genetic studies to illuminate the mechanisms that underlie meiotic chromosome interactions.
Funder
HHS | NIH | National Institute of General Medical Sciences
HHS | NIH | Eunice Kennedy Shriver National Institute of Child Health and Human Development
Publisher
Proceedings of the National Academy of Sciences