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  • Stanford Geneticists Find Sex the Single Greatest Predictor of Whether Certain Genes Are Expressed
February 28, 2021

Stanford Geneticists Find Sex the Single Greatest Predictor of Whether Certain Genes Are Expressed

Stanford Geneticists Find Sex the Single Greatest Predictor of Whether Certain Genes Are Expressed

by Marianne J. Legato / Wednesday, 29 July 2015 / Published in Dr. Legato's Blog

Though our DNA is fixed, the expression of genes is not. Some genes stay dormant for our entire lives, some are always ‘on’, others are active at some points, and inactive at others. We are only at the beginning of understanding what causes this ‘toggling’ of our genes, but a recent study suggests gender may be an important factor.

A new technique developed at Stamford University School of Medicine, allows researchers to work with real cells in real time, gathered from a living person, rather than using cells grown from other cells in a lab.

In a study published July 29 in the new journal Cell Systems “Individuality and Variation of Personal Regulomes in Primary Human T Cells”, lead investigator Howard Chang describes how his team took ordinary blood samples from 12 healthy volunteers, and isolated their T cells, an important component of the immune system. They measured the way certain genes in the cells are switched on and off, and how that measure varied from individual to individual. Chang’s team also looked at how much change occurred at different times in the same volunteers.

They found that the single greatest predictor for certain genes’ tendency to turn on and off was the sex of the person.

Across the 12 volunteers, 7 percent of the genes were switched on in different patterns from person to person. For each person, these patterns persisted over time, like a unique fingerprint. “But the single greatest predictor for genes’ tendency to turn on and off was the sex of the person. In terms of significance,” said Chang, “sex was far more important than all the other things we looked at, perhaps even combined.”

When the team measured gene activity levels from 30 of the top 500 genes the researchers expected would show gender-influenced activity, they found that 20 of the 30 genes showed significant differential activity between men and women. Research like this may help to explain the much higher incidence in women of autoimmune diseases such as scleroderma, lupus and rheumatoid arthritis.

Click here to read the full article…

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Marianne J. Legato
Marianne J. Legato

Marianne J. Legato, MD, Ph. D. (hon. c.), FACP is an internationally renowned academic, physician, author, lecturer, and pioneer in the field of gender-specific medicine. She is a Professor Emerita of Clinical Medicine at Columbia University College of Physicians & Surgeons and an Adjunct Professor of Medicine at Johns Hopkins Medical School. Dr. Legato is also the Director of the Foundation for Gender-Specific Medicine, which she founded in 2006 as a continuation of her work with The Partnership for Gender-Specific Medicine at Columbia University. She received an honorary PhD from the University of Panama in 2015 for her work on the differences between men and women.

At its core, gender-specific medicine is the science of how normal human biology differs between men and women and how the diagnosis and treatment of disease differs as a function of gender. Dr. Legato’s discoveries and those of her colleagues have led to a personalization of medicine that assists doctors worldwide in understanding the difference in normal function of men and women and in their sex-specific experiences of the same diseases.

She began her work in gender-specific medicine by authoring the first book on women and heart disease, The Female Heart: The Truth About Women and Coronary Artery Disease, which won the Blakeslee Award of the American Heart Association in 1992. Because of this research, the cardiovascular community began to include women in clinical trials affirming the fact that the risk factors, symptoms, and treatment of the same disease can be significantly different between the sexes. Convinced that the sex-specific differences in coronary artery disease were not unique, Dr. Legato began a wide-ranging survey of all medical specialties and in 2004, published the first textbook on gender-specific medicine, The Principles of Gender-Specific Medicine. The second edition appeared in 2010 and the third edition, dedicated to explaining how gender impacts biomedical investigation in the genomic era, won the PROSE Award in Clinical Medicine from the Association of American Publishers in 2018. A fourth edition is forthcoming.

She also founded the first scientific journals publishing new studies in the field, The Journal of Gender-Specific Medicine, and a newer version, Gender Medicine, both listed in the Index Medicus of the National Library of Medicine. She has founded a third peer-reviewed, open access journal, Gender and the Genome, which focuses on the impact of biological sex on technology and its effects on human life.

Dr. Legato is the author of multiple works, including: What Women Need to Know (Simon & Schuster, 1997), Eve’s Rib (Harmony Books, 2002), Why Men Never Remember and Women Never Forget (Rodale, 2005), Why Men Die First (Palgrave, 2008), The International Society for Gender Medicine: History and Highlights (Academic Press, 2017), and most recently, The Plasticity of Sex (Academic Press, 2020). Her books have been translated into 28 languages to date.

As an internationally respected authority on gender medicine, Dr. Legato has chaired symposia and made keynote addresses to world congresses in gender-specific medicine in Berlin, Israel, Italy, Japan, Panama, South Korea, Stockholm, and Vienna. In collaboration with the Menarini Foundation, she is co-chairing a symposium on epigenetics, Sex, Gender and Epigenetics: From Molecule to Bedside, to be held in Spring 2021 in Italy. She maintains one of the only gender-specific private practice in New York City, and she has earned recognition as one of the “Top Doctors in New York.”

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