Our work focuses on studying mechanisms of regeneration and development, as well as on developing research tools. Below is the list of the ongoing research projects in the lab.

Nerve Dependency of Regeneration

Regeneration requires innervation. Nerves release molecules that encourage cell division and repair of injured organs and tissues. We have discovered that one such nerve-derived molecule is neuregulin-1, which drives regeneration of the axolotl limbs, spinal cord, and lungs. Many current lab projects target the role of nerves in limb regeneration, including regulation of cell cycle and timeline of regeneration.

Funding source: National Science Foundation

Mechanobiology of Joint Morphogenesis

Axolotls are a useful model for studying how joints assume their complex shapes. In collaboration with the Shefelbine lab, we combine research on developing and regenerating axolotl limbs with predictive computational models to understand how mechanical forces trigger cellular signaling responses and change joint shape.

Funding source: National Science Foundation

Limb Development and Patterning

A developing or regenerating limb must grow bones, muscles, nerves, and skin – all in right amounts and places. This process of limb patterning is regulated by many signaling molecules. Retinoic acid, a metabolite of vitamin A, is one of them. We use V3 HCR FISH and a genetic engineering tool CRISPR/Cas9 to understand how retinoic acid controls axolotl limb growth. We also compare gene expression during regeneration and development to understand the mechanisms of limb growth.

Funding source: National Institutes of Health

This axolotl embryo was genetically engineered so that the cells with active retinoic acid signaling would glow green under the microscope. Photo by Tim Duerr.

Epithelium in Limb Regeneration

Shortly after axolotl limb amputation, skin cells migrate and cover the open wound. This wound epithelium then forms the apical epithelial cap on the tip of the blastema, which is critical for limb regeneration. We study gene expression in the skin of regenerating limbs, with special attention to how Wnt5a determines the direction of limb outgrowth.

Funding source: National Science Foundation

Retinal Regeneration

Retina is a thin neural structure in the eye that captures visual information about the world and sends it to the brain. Unlike humans, axolotls can regenerate their damaged retinas, regrowing the neurons and nerve connections. In collaboration with the Carrier laboratory, we investigate what genes and cells drive axolotl retinal regeneration. 

Funding sources: National Science FoundationRetina Research Foundation

In salamanders and humans alike, the retina contains three distinct layers of neuronal cell bodies (blue) and their axons (red). Photo by Anastasia Yandulskaya.

Lung Regeneration

Upcoming collaboration with the Kotton Lab at Boston University.

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The Monaghan Lab
Northeastern University
360 Huntington Avenue
Boston, MA 02115

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