Stefania Nicoli, PhD

Associate Professor Term

Research Departments & Organizations

Center for RNA Science and Medicine

Internal Medicine: Nicoli Lab

Vascular Biology and Therapeutics Program

Yale Stem Cell Center

Office of Cooperative Research

Research Interests

Blood-Brain Barrier; Cardiovascular System; MicroRNAs; Neurons; Zebrafish

Research Summary

Using Zebrafish, my laboratory's goal is to understand how small non-coding RNAs coordinate cardiovascular and neuronal development.

Extensive Research Description

The vascular system is fundamental for embryonic development and adult life, and aberrant vascularization is associated with numerous diseases, including cancer,atherosclerosis and stroke. Since the processes that govern blood vessel formation are conserved, it is possible to use model systems to gain novel insights on vascular development and function. The Zebrafish (Danio rerio) is an ideal model to study blood vessel formation during embryonic development. The transparency and external development of the zebrafish embryo allow an unprecedented level of observation and experimental manipulation. In parallel, numerous techniques allow forward and reverse genetic analysis of signaling pathways in the zebrafish.These genetic approaches coupled with the ability to easily visualize circulatory patterns and blood vessel morphology, make the zebrafish an ideal in vivo platform to assay gene function during vascular development.

microRNAs (miRNAs) are highly conserved non-coding small RNAs that post-transcriptionally regulate gene expression by binding to the 3’UTR of target mRNAs and inhibit their translation, or promote their degradation. miRNAs are autonomously transcribed in a large mRNA transcript (pri-mRNA), or are found in introns of coding genes. In both cases,mature miRNAs are formed by sequential processing into a primary stem loop precursor (pre-miRNAs) by the endonucleases Drosha and Dicer. In vertebrates,the 22 base pair duplex miRNAs are unwound and a single mature strand is loaded onto Argonaute 2 (Ago2). The Ago2/miRNA complex (the RNA-induced silencing complex, or RISC), leads to translational repression and decreased transcript stability, through deadenylation. miRNAs function in a number of different biological processes, including cardiogenesis, muscle development, oncogenesis, brain morphogenesis, and hematopoiesis.

Despite recent findings, several critical barriers remain that hamper the study of miRNAs. First, identification of relevant miRNA targets, especially cell-specific target transcripts in vivo,can be difficult. Second, genetic manipulation (i.e. targeted knockout) of miRNA sequences in the vertebrate genome can be challenging and, until recently, had been limited to mice. Third, in many cases loss of miRNA function leads to subtle phenotypic changes, which can be difficult to observe and characterize during embryonic stages in mouse. Finally, the genetic interaction of miRNAs and their targets can be difficult to dissect in vivo in the mouse system.

The lab takes advantage of the zebrafish as a model system to overcome these barriers. Our goal is to elucidate how miRNAs participated in the genetic network driving arteries-veins differentiation, angiogenesis, neuro-vascular development.

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Contact Info

Stefania Nicoli, PhD
Lab Location
Nicoli Lab300 George Street
New Haven, CT 06511
Office Location
300 George Street
New Haven, CT 06511
Mailing Address
300 George St

New Haven, CT 06511

Curriculum Vitae


Research Image 1

MicroRNAs Establish Uniform Traits during the Architecture of Vertebrate Embryos

Research Image 2

Cartoon representing the miR-107-dicer interaction to keep miR-9 level across the hindbrain ventricular zone

Research Image 3

Zebrafish Vascular-Mural-Noradrenergic unit. Green: Endothelial cells; Blue: Sympathetic Neurons; Red: Smooth Muscle Cells