{"cache":{"posts_f30bc_0c943":{"__typename":"RootQueryToPostConnection","nodes":[{"__typename":"Post","id":"cG9zdDoyMzQ4OQ==","categories_3cd3e_bf21a":{"__typename":"PostToCategoryConnection","edges":[{"__typename":"PostToCategoryConnectionEdge","node":{"__typename":"Category","id":"dGVybToxMzQ0","name":"Research","slug":"23andme-research","uri":"/category/23andme-research","seo":{"__typename":"TaxonomySEO","title":"Research Archives - 23andMe Blog","opengraphTitle":"Research Archives","metaDesc":"23andMe research unique research model combines genetic and phenotypic information in what is among the largest databases of its kind.","opengraphDescription":"23andMe research unique research model combines genetic and phenotypic information in what is among the largest databases of its kind.","fullHead":"\n\n\n\n\n\n\n\n\n\n\t\n\t\n\t\n\n\n\n"}}}]},"uri":"/articles/love-and-science","content_b28e9_bf21a":"

Researchers often say it’s their love of science that drives their work, but for Eric Minikel and Sonia $\"Eric$ Vallabh it’s their love that propels the science.\n

\nThe married couple – both are researchers at the Broad Institute and are completing their doctorates at Harvard Medical School – helped to co-author a new paper looking at the genetic risk for developing prion disease, a rare but devastating condition that hits the nervous system, impairs brain function, triggers other neurodegenerative symptoms such as memory loss and insomnia, and ultimately causes death. It’s triggered when a protein misfolds causing clumping in brain tissue, typically manifesting itself around the age of 50.\n

It’s Personal

\nFor Eric and Sonia this research is personal, as Eric movingly writes in this blog post.

About five years ago, not long after they married, their lives took a sharp turn when Sonia’s mother died at 52. It was only after her mother passed away that Sonia and Eric learned about what killed her – Fatal Familial Insomnia, a form of prion disease. Soon thereafter Sonia learned that she inherited a genetic mutation putting her at a very high risk for the disease.

In response, first Sonia, who’d recently graduated from law school at Harvard, and then Eric, a city planner and software engineer, made career changes dedicating their lives to finding a cure for prion disease. They started out working at a lab at Massachusetts General Hospital, took night courses and eventually were accepted at Harvard Medical School, and are now working in the Stuart L. Schreiber Research Laboratory at the Broad Institute of MIT and Harvard.

$\"Sonia$

Sonia working in the lab.

Even before this paper they made an impact. A few years ago, the couple formed the non-profit Prion Alliance and Eric started the blog CureFFI, which is a great resource for information about research into prion disease. It also catalogues his education in the science and what motivates him.

Their story has been featured in both the Atlantic and the New Yorker. A joint presentation they did at the American Society of Human Genetics focused on citizen science and crowdsourcing for scientific research.

More recently, Eric developed a statistical method that refuted previous studies suggesting that in families with inherited prion disease, the disease will manifest itself as much as 14 years earlier with each generation. If true that would have been devastating for Sonia, who turned 31 in 2015. But Eric’s findings also highlight problems with research into other rare diseases, which can suffer from a lack of data or selection bias because the data comes from within the disease communities that they study.

The research for this paper – which draws in part from data provided by 23andMe and Exome Aggregation Consortium data from the Broad – is important because it changes assumptions about the risks associated with some of the more than 60 mutations in the PRNP gene that are thought to confer risk for prion disease. In another recently published paper,

Harvard’s Robert Green points out that Eric and Sonia’s work doesn’t just shed light on prion, it also highlights the power of sharing genetic data:\n

\n“The story of this research stands as a testament to the generosity of unrequited data sharing from thousands of individuals and scientists around the globe, and to the unflinching devotion of a young couple to alter their seemingly unalterable genetic destiny,” Green writes.\n

Real Progress

\nThe study began with the observation that variants in the PRNP gene that have been reported to cause prion disease are actually at least 30 times more common than expected in the general population. Up until now, many doctors have assumed that all those mutations were associated with a 100 percent risk for developing the disease. However, if all of these mutations were “completely penetrant,” or 100 percent disease-causing, then the number of people developing the disease each year would have to be much higher than what is actually seen in clinics around the world. This discrepancy suggested to the researchers that some of these variants could have “incomplete penetrance”, or may even have no impact at all on the risk of disease. $\"eric-sonia-in-lab\"$

By comparing the frequency of individual variants in prion disease patients versus the general population, the team found that the variants previously reported to cause prion disease aren’t all created equal — they actually form a spectrum of risk. At one end, some mutations previously reported as disease-causing appear to be benign, meaning that they do not increase risk of prion disease above the baseline risk in the general population.

On the other end, some mutations really do convey a very high risk, upwards of 80-to-90 percent, of developing disease in one’s lifetime. In between, some variants appear to convey intermediate lifetime risk of, for example, 0.1 or 10 percent. And then there were some variants for which the data was not yet sufficient to draw conclusions.

For some individuals who carry variants that now appear to be low risk, this is great news, according to the researchers.

“Through our relationship in the patient community we have met people with several of the mutations that we now believe are low-risk or benign, and some of those people had been told they had a very high risk of disease, so our work changes their prognosis,” said Eric.

Unfortunately Sonia’s mutation, D178N, isn’t one of those that are low risk. The new research confirms that the mutation she carries – along with mutations that many others carry – confers a near 100 percent risk for developing prion disease.\n

\n“Our work doesn’t change the prognosis for most patients with genetic prion disease,” said Eric. “Only a minority of them.”\n

Love and Science

\nAlthough it doesn’t directly change Sonia’s prognosis, the new study may help in efforts around developing drugs to treat prion disease. The study found that that among the benign mutations, a few reduce the function of the prion protein. Because carriers of these so-called “loss-of-function” mutations are apparently healthy, it suggests that it may be safe to develop drugs that work against the protein. Eric and Sonia are now working on developing molecules to do just that, and now they can move in that direction with more confidence.

In the context of prion disease, this study positively impacts the prognosis for a few hundred individuals worldwide, while providing validation for a therapeutic strategy that may offer hope more broadly to patients and families affected by prion disease.

More generally, the study also highlights the value of large reference datasets like 23andMe’s and the Broad’s, the researchers said.

For this study researchers used exome data from 60,000 people collected by the Broad Institute from a large international consortium, and genotypic data from more than 530,000 23andMe customers who consented to research. Excitingly, as datasets of this size continue to grow, so will their power to expand and refine our understanding of human disease.\n

\nIn the profile of the couple that appeared in the New Yorker in 2014, the writer quotes from an email he received from Sonia trying to describe her relationship with Eric.\n

\n“I thought when I married him that I could never love anyone more than I did that day. But I was wrong,” she said. “We are in a new dimension of partnership now, and I am more in love and, frankly, more in awe of him with every day we spend together. His brain is outstandingly powerful and I am seeing things I never would have known he was capable of in any other way. He was meant to do this work, and the world will be better for it.”\n

\nLove might not conquer all but Eric and Sonia’s work points to what it can do when fueling the work of two brilliant minds.

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exome

Quantifying genetic risk of prion disease

23andMe Moves into the World of Sequencing

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