During cytokinesis, a cortical contractile ring forms around the cell equator and constricts to partition the contents of the mother cell into the two daughter cells. Cytokinesis represents a paradigm for a temporally and spatially controlled cellular shape change that is achieved by regulation of the actomyosin cortex.  I will present two new studies related to the mechanism of cytokinesis conducted in the one-cell C. elegans embryo. To initiate cytokinesis, the anaphase spindle sends a stimulatory signal to the cell equator that promotes cortical contractility.

Life is in a constant state of revision in response to evolutionary pressures such as environmental change. In the Clark lab we seek to understand these adaptive changes by studying evolutionary signatures in genes and regulatory sequences. Our computational methods leverage convergent evolution, in which independent phylogenetic lineages evolve the same phenotype, to discover the genetic changes underlying specific adaptations.

Neuromodulation and differential learning in mosquitoes with various host preferences

By: Dr. Gabriella Wolff (Riffell Lab)

Nature-inspired solutions have spawned such products as potential cancer cures from animal and plants, novel antibiotics, and gecko-inspired adhesives. This “bio-inspired” approach applies integrative methods from anatomy, animal function, evolution, and biomechanics to inspire novel synthetic materials.  Further, new methods for visualizing animals has opened new doors into understanding the diversity of life.  This lecture will discuss how studies of gecko form and functions have contributed to a broader understanding of bio-inspiration.

Bachelor Birds: Why Models Should Consider Seabird Sex

By: Natasha Gownaris

The latitudinal gradient in species diversity is one of the most obvious ecological patterns on the planet, yet the mechanisms underlying this pattern remain unresolved and controversial. The fundamental problem relates to linking latitudinal variation in the environment to the processes that lead to the evolution of reproductive isolation and species formation.

The mission of the Allen Institute for Cell Science is to understand and predict cellular behaviors. Our initial project takes an integrative approach, developing high replicates of dynamic, visual data on cell organization and activities using endogenous fluorescently tagged human induced pluripotent stem cells. We are quantifying the relative locations and dynamics of the major cellular structures and activities as the stem cells go through the cell cycle and differentiate into cardiomyocytes andrespond to environmental perturbations and drugs.

The “bush tomatoes” (Solanum) of the Australian Monsoon Tropics continue to generate questions related to reproductive ecology, species boundaries, biogeography, and breeding systems evolution. This talk will summarize work done on this unusual group of plants in the Martine lab, often inclusive of undergraduate students, through a holistic research strategy that includes fieldwork, herbarium collections, greenhouse culture, and molecular approaches.

The mechanical properties of most eukaryotic cells is determined by the actin cytoskeleton. A major challenge to understanding the physical properties of actin networks, however, is that they are dynamic: their assembly and disassembly are integral to their function. External forces are particularly relevant to ‘dendritic’ actin networks, generated by the nucleating and crosslinking activity of the Arp2/3 complex, a seven-subunit protein complex that builds crosslinked filament arrays by creating new filaments that branch from the sides of existing filaments.

Wolbachia is a bacterial endosymbiont present in over half the insect species on the planet and in a number of nematode species.  The success of Wolbachia is largely due to its efficient maternal transmission and extraordinary ability to manipulate host reproduction and behavior.