Rising up in Brazil, Marcos Simões-Costa usually visited his grandparents’ farm within the Amazon. That immersion in nature — squawking toucans and all — sparked his fascination with science and evolution. However a video of a creating embryo, proven in his center faculty science class, cemented his want to grow to be a developmental biologist.
“It’s such an attractive course of,” he says. “I used to be at all times into drawing and artwork, and it was very visible — the shapes of the embryo altering, the truth that you begin with one cell and the complexity is growing. I simply received misplaced in that video.”
Right now, Simões-Costa, of Harvard Medical Faculty and Boston Kids’s Hospital, is honoring his youthful self by demystifying how the embryo develops. He research the embryos and stem cells of birds and mice to find out how networks of genes and the weather that management them affect the id of cells. The work may result in new therapies for numerous illnesses, together with most cancers.
“The embryo is our greatest trainer,” he says.
Simões-Costa focuses on the embryo’s neural crest cells, a inhabitants of stem cells that type within the creating central nervous system. The cells migrate to different elements of the embryo and provides rise to many alternative cell sorts, from the bone cells of the face to muscle cells to mind and nerve cells.
Scientists have puzzled for years why, regardless of being so related, neural crest cells within the cranial area of the embryo can type bone and cartilage, whereas these within the trunk area can’t type both. Whereas a postdoc at Caltech, Simões-Costa studied the cascade of molecules that govern how genes are expressed in every cell sort. Along with his adviser, developmental biologist Marianne Bronner, he recognized transcription components — proteins that may flip genes on and off — that had been current solely in cranial cells. Transplanting the genes for these proteins into trunk cells endowed the cells with the flexibility to create cartilage and bone.
Now in his personal lab, he continues to piece collectively simply how this huge regulatory community influences the specialization of cells. His staff reconstructed how neural crest cells’ full set of genetic directions, or the genome, folds right into a compact, 3-D form. The researchers recognized quick DNA sequences, referred to as enhancers, which might be positioned in faraway areas of the genome, however find yourself near key genes when the genome folds. These enhancers work with transcription components and different regulatory components to regulate gene exercise.
Simões-Costa can also be utilizing neural crest cells to elucidate a wierd habits shared by most cancers cells and a few embryonic cells. These cells produce vitality anaerobically, with out oxygen, even when oxygen is current. Known as the Warburg impact, this metabolic course of has been studied extensively in most cancers cells, however its operate remained unclear.
By means of experiments manipulating the metabolism of neural crest cells, Simões-Costa’s staff discovered that the Warburg impact is critical for the cells to maneuver round throughout early improvement. The mechanism, which ought to keep turned off in nonembryonic cells, in some way “will get reactivated in grownup cells within the context of most cancers, main these cells to grow to be extra migratory and extra invasive,” Simões-Costa says.
“He’s one of many few individuals who’s actually checked out [this process in neural crest cells] at a molecular degree and achieved a deep dive into the mechanisms underlying it,” says Bronner.
Cleverly combining classical embryological strategies with the newest genomic applied sciences to deal with basic questions in developmental biology is what makes Simões-Costa particular, says Kelly Liu, a developmental biologist at Cornell College. He desires to grasp not solely what particular person genes do, however how they work at a methods degree, she says.
How does the genetic blueprint inform cells the place they’re within the embryo, and what they need to be doing? How do most cancers cells hijack the Warburg impact, and will understanding of that course of result in new therapies? These are a number of the questions Simões-Costa desires to deal with subsequent.
“It’s been 20 years because the Human Genome Mission got here to a conclusion,” he says, referring to the huge effort to read the human genetic instruction book. “However there’s nonetheless a lot thriller within the genetic code.”
These mysteries, plus a deep ardour for lab work, gas Simões-Costa’s analysis. “Being on the bench is after I’m the happiest,” he says. He likens the fragile craft of performing exact surgical procedures on tissues and cells to meditation. “It doesn’t get outdated.”
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