Carnegie Science, Carnegie Institution, Carnegie Institution for Science
Baltimore, MD---Athletes, the elderly and those with degenerative muscle disease would all benefit from accelerated muscle repair. When skeletal muscles, those connected to the bone, are injured,...
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Washington, D.C.—  Zehra Nizami has been a graduate student and postdoc in Joe Gall’s lab at the Department of Embryology. She is the fourth recipient of the Postdoctoral Innovation and Excellence (...
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Baltimore, MD--BioEYES, the K-12 science education program headquartered at  Carnegie's Department of Embryology, was recognized with four other organizations by the General Motors Foundation, at the...
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Baltimore, MD— As we age, the function and regenerative abilities of skeletal muscles deteriorate, which means it is difficult for the elderly to recover from injury or surgery. New work from...
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Baltimore, MD—New work from Carnegie’s Allan Spradling and Lei Lei demonstrates that mammalian egg cells gain crucial cellular components at an early stage from their undifferentiated sister cells,...
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Washington, D.C.—Matthew Sieber, a postdoctoral fellow at the Department of Embryology, has been honored for his extraordinary accomplishments, through a new program that recognizes exceptional...
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Baltimore, MD— Reproduction is highly dependent on diet and the ability to use nutrients to grow and generate energy. This is clearly seen in women, who must provide all the nutritional building...
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San Diego, CA— Ghosts are not your typical cell biology research subjects. But scientists at the Carnegie Institution for Science and the National Institute of Child Health and Human Development (...
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The Fan laboratory studies the molecular mechanisms that govern mammalian development, using the mouse as a model. They use a combination of biochemical, molecular and genetic approaches to identify and characterize signaling molecules and pathways that control the development and maintenance of...
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In mammals, most lipids, such as fatty acids and cholesterol, are absorbed into the body via the small intestine. The complexity of the cells and fluids that inhabit this organ make it very difficult to study in a laboratory setting. The goal of the Farber lab is to better understand the cell and...
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Approximately half of the gene sequences of human and mouse genomes comes from so-called mobile elements—genes that jump around the genome. Much of this DNA is no longer capable of moving, but is likely “auditioning”  perhaps as a regulator of gene function or in homologous recombination, which is...
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The Donald Brown laboratory uses  amphibian metamorphosis to study complex developmental programs such as the development of vertebrate organs. The thyroid gland secretes thyroxine (TH), a hormone essential for the growth and development of all vertebrates including humans. To understand TH,...
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Integrity of hereditary material—the genome —is critical for species survival. Genomes need protection from agents that can cause mutations affecting DNA coding, regulatory functions, and duplication during cell division. DNA sequences called transposons, or jumping genes (discovered by Carnegie’s...
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Frederick Tan holds a unique position at Embryology in this era of high-throughput sequencing where determining DNA and RNA sequences has become one of the most powerful technologies in biology. DNA provides the basic code shared by all our cells to program our development. While there are about 30...
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Matthew Sieber, a postdoctoral fellow at the Department of Embryology, has been honored for his extraordinary accomplishments, through a new program that recognizes exceptional Carnegie postdoctoral...
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Baltimore, MD— A woman’s supply of eggs is a precious commodity because only a few hundred mature eggs can be produced throughout her lifetime and each must be as free as possible from genetic damage...
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Baltimore, MD—Carnegie’s BioEYES K-12 science educational program launches a new center sponsored by the University of Utah, Department of Pediatrics, Pediatric Research Enterprise. The new program...
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Fruit fly
September 20, 2018

Baltimore, MD— Body organs such as the intestine and ovaries undergo structural changes in response to dietary nutrients that can have lasting impacts on metabolism, as well as cancer susceptibility, according to Carnegie’s Rebecca Obniski, Matthew Sieber, and Allan Spradling.

Their work, published by Developmental Cell, used fruit flies, which are currently the most-sensitive experimental system for such detecting diet-induced cellular changes that are likely to be similar in mammals.

There are three major types of cells in fruit fly (and mammalian) intestines: Stem cells, hormone-producing cells, and nutrient-handling cells. Think of the stem cells as blanks, which are

September 18, 2018

Ethan Greenblatt, a senior postdoctoral associate in Allan Spradling’s lab at the Department of Embryology, has been awarded the eleventh Postdoctoral Innovation and Excellence Award. Greenblatt has made a major impact on biological science, particularly with his research identifying genetic factors underlying fragile X syndrome, the most common cause of autism.

Recipients of these postdoctoral awards are given a cash prize for their exceptionally creative approaches to science, strong mentoring, and contributing to the sense of campus community. A celebration is also held in their honor. These awards are made through nominations from the departments and are chosen by the Office

September 14, 2018

Baltimore, MD—The Pew Charitable Trust has awarded Carnegie’s Steve Farber and colleague John F. Rawls of Duke University a $200,000 grant to investigate how dietary nutrients, such as fats, alter the ability to sense glucose in the gut—a process that involves the microbial ecosystem in the gut. Results from this research could reveal how microbes and nutrients in the gut environment interact and could provide new strategies to combat disorders such as diabetes and obesity.

Rawls has investigated host-microbe interactions, and Farber studies lipid­ metabolism. Together they will use the zebrafish for this work. Zebrafish are entirely clear while embryos and are ideal for observing

This image shows an example of defects in the development of the embryonic central nervous system in stored eggs that lacked the Fmr1 gene.
August 15, 2018

Baltimore, MD—New work from Carnegie’s Ethan Greenblatt and Allan Spradling reveals that the genetic factors underlying fragile X syndrome, and potentially other autism-related disorders, stem from defects in the cell’s ability to create unusually large protein structures. Their findings are published in Science.

Their research focuses on a gene called Fmr1. Mutations in this gene create problems in the brain as well as the reproductive system. They can lead to the most-common form of inherited autism, fragile X syndrome, as well as to premature ovarian failure.

It was already thought that Fmr1 plays a pivotal part in the last stages of the process by which the recipe

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The Fan laboratory studies the molecular mechanisms that govern mammalian development, using the mouse as a model. They use a combination of biochemical, molecular and genetic approaches to identify and characterize signaling molecules and pathways that control the development and maintenance of the musculoskeletal and hypothalamic systems.

The musculoskeletal system provides the mechanical support for our posture and movement. How it arises during embryogenesis pertains to the basic problem of embryonic induction. How the components of this system are repaired after injury and maintained throughout life is of biological and clinical significance. They study how this system is

The thyroid gland secretes thyroxine (TH), a hormone essential for the growth and development of all vertebrates including humans. To understand TH action, the Donald Brown lab studies one of the most dramatic roles of the hormone, the control of amphibian metamorphosis—the process by which a tadpole turns into a frog. He studies the frog Xenopus laevis, from South Africa, because it is easy to rear. Events as different as the formation of limbs, the remodeling of organs, and the resorption of tadpole tissues such as the tail are all directed by TH. How can a simple molecule control so many different developmental changes? The hormone works by regulating the expression of groups of genes

The Zheng lab studies cell division including the study of stem cells, genome organization, and lineage specification. They study the mechanism of genome organization in development, homeostasis—metabolic balance-- and aging; and the influence of cell morphogenesis, or cell shape and steructure,  on cell fate decisions. They use a wide range of tools and systems, including genetics in model organisms, cell culture, biochemistry, proteomics, and genomics.


The Spradling laboratory studies the biology of reproduction. By unknown means eggs reset the normally irreversible processes of differentiation and aging. The fruit fly Drosophila provides a favorable multicellular system for molecular genetic studies. The lab focuses on several aspects of egg development, called oogenesis, which promises to provide insight into the rejuvenation of the nucleus and surrounding cytoplasm. By studying ovarian stem cells, they are learning how cells maintain an undifferentiated state and how cell production is regulated by microenvironments known as niches. They are  also re-investigating the role of steroid and prostaglandin hormones in controlling the

Allan Spradling is a Howard Hughes Medical Institute Investigator and director of the Department of Embryology. His laboratory studies the biology of reproduction particularly egg cells, which are able to reset the normally irreversible processes of differentiation and aging that govern all somatic cells—those that turn into non-reproductive tissues. Spradling uses the fruit fly Drosophila because the genes and processes studied are likely to be similar to those in other organisms including humans. In the 1980s he and his colleague, Gerald Rubin, showed how jumping genes could be used to identify and manipulate fruit fly genes. Their innovative technique helped establish Drosophila as

The mouse is a traditional model organism for understanding physiological processes in humans. Chen-Ming Fan uses the mouse to study the underlying mechanisms involved in human development and genetic diseases. He concentrates on identifying and understanding the signals that direct the musculoskeletal system to develop in the mammalian embryo. Skin, muscle, cartilage, and bone are all derived from a group of progenitor structures called somites. Various growth factors—molecules that stimulate the growth of cells—in the surrounding tissues work in concert to signal each somitic cell to differentiate into a specific tissue type.

The lab has identified various growth factors that

Staff associate Christoph Lepper, with colleagues, overturned previous research that identified critical genes for making muscle stem cells. It turns out that the genes that make muscle stem cells in the embryo are surprisingly not needed in adult muscle stem cells to regenerate muscles after injury. The finding challenges the current course of research into muscular dystrophy, muscle injury, and regenerative medicine, which uses stem cells for healing tissues, and it favors using age-matched stem cells for therapy.

Previous studies showed that two genes Pax3 and Pax7, are essential for making the embryonic and neonatal muscle stem cells in the mouse. But Lepper and team for the

The first step in gene expression is the formation of an RNA copy of its DNA. This step, called transcription, takes place in the cell nucleus. Transcription requires an enzyme called RNA polymerase to catalyze the synthesis of the RNA from the DNA template. This, in addition to other processing factors, is needed before messenger RNA (mRNA) can be exported to the cytoplasm, the area surrounding the nucleus.

Although the biochemical details of transcription and RNA processing are known, relatively little is understood about their cellular organization. Joseph G. Gall has been an intellectual leader and has made seminal breakthroughs in our understanding of chromosomes, nuclei and