The reprogramming of somatic cells to a spontaneously contracting cardiomyocyte-like state using defined transcription factors has proven successful in mouse fibroblasts. However, this process has been less successful in human cells, thus limiting the potential clinical applicability of this technology in regenerative medicine. We hypothesized that this issue is due...
One of the fundamental questions in developmental biology is how a single cell gives rise to a complex organism. More specifically, how a totipotent egg divides into cells that become increasingly restricted in their potential. Development is a process of increasingly restricted cellular potential, and here I home in on...
Dopamine (DA) neurons are involved in many brain functions, and their dysfunction is associated with several neurodegenerative diseases. In recent years, our lab and others have found that DA neurons are molecularly diverse through single-cell gene expression profiling. An outstanding question in the field is whether this heterogeneity is encoded...
Preterm birth (PTB) is the leading cause of infant morbidity worldwide. Approximately 380,000 babies are born prematurely in the USA every year. Estrogen (E2) and progesterone (P4) play essential roles during pregnancy and labor; a clear understanding of their action mechanisms, however, is lacking. E2 and P4 function by activating...
Pattern formation of biological structures involves the arrangement of different types of cells in an ordered spatial configuration. Patterning is thought to involve the spatial organization of molecular pre-patterns that precede and drive subsequent cell differentiation and coinciding morphogenesis. These molecular prepatterns are often, although not exclusively, organized through Turing...
Zinc, an essential trace element that serves as an enzyme cofactor and can also be stored as a divalent ion in cellular vesicles, is emerging as an important mediator of signaling pathways required for biological functions such as growth, development, and reproduction. Zinc mediates cell signaling by acting both as...
Body size is one of the most discernible ways in which animal species vary. The blue whale (Balaenoptera musculus), the largest animal on earth, can reach up to 30 m in length and weigh up to 200 tonnes. At the other extreme, a species of frog called Paedophryne amauensis is...
Recent discoveries in vitamin D research indicate that vitamin D is a necessary component to several organs and tissues that extends beyond bone formation Furthermore, recent research indicates that vitamin D deficiency is rampant across the globe. Historically, anthropological research has focused on the adaptive significance of skin color to...
A variety of human diseases and pregnancy related disorders reflect endometrial dysfunction. However, rodent models do not share fundamental biological processes with the human endometrium, such as cyclic menstruation, and no existing human cell cultures recapitulate the cyclic interactions between endometrial stromal and epithelial compartments necessary for decidualization and implantation....
Cells are often precisely organized into patterns within developing tissues. This precision must emerge from biochemical processes within, and between cells, that are inherently stochastic. I investigated the impact of stochastic gene expression on self-organized pattern formation, focusing on Senseless (Sens), a key target of Wnt and Notch signaling during...