Stay Close to Your Sister

Trying to Avoid Your Sister

Connections between chromosomes are essential for their accurate segregation during cell division. In somatic cells dividing by mitosis, newly replicated sister chromatids are connected by cohesin proteins. When the sister chromatids become attached to microtubules emanating from opposite poles of the spindle, cohesins resist the pulling forces and the ensuing tension stabilizes the chromatid–m...

Do Projections Stay Close Together?

We estimate the rate of convergence of products of projections on lines in R. Consider the orbit of a point under any sequence of orthogonal projections on K lines in R. Assume that the sum of the squares of the distances of the consecutive iterates is less than ε. We show that if ε tends to zero, then the diameter of the orbit tends to zero uniformly for all families L of a fixed number K of l...

Holding your own: establishing sister chromatid cohesion.

Chromosome Segregation and Genome Integrity At cell division, both daughter cells receive only one copy of the parental genome. Not surprisingly, chromatin plays a role at numerous stages to ensure that genome segregation occurs with high fidelity. First, each chromosome is duplicated to produce two identical chromosomes called sister chromatids. Second, sister chromatids become paired, or glue...

Animal Behavior: Stay Close for Comfort

Mate guarding - a male staying near a female for a while after mating - has traditionally been interpreted in the context of sexual conflict. New observations of wild field crickets suggest instead that guarding males provide protection from predators, enhancing female fitness.

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