The flu vaccine did a disappointing job last winter in the U.S., and officials worry that might be a bad sign for the fall.

Scientists say they have used the gene editing tool CRISPR inside someone’s body for the first time, a new frontier for efforts to operate on DNA, the chemical code of life, to treat diseases.

Women who use certain types of hormones after menopause still have an increased risk of developing breast cancer nearly two decades after they stop taking the pills, long-term results from a big federal study suggest.

Scientists dreamed of genetically engineering a flower patterned in the Games’ blue-and-white checkerboard emblem.

Scientists are reporting the first use of the gene-editing tool CRISPR to try to cure a patient’s HIV infection by providing blood cells that were altered to resist the AIDS virus.

More women may benefit from gene testing for hereditary breast or ovarian cancer, especially if they’ve already survived cancer once, an influential health group recommended Tuesday.

A lab at the American Museum of Natural History is uncovering the genes behind each type of spider silk to create a sort of “silk library.” It’s part of an effort to learn how spiders make so many kinds of silk and what allows each kind to behave differently.

New research gives some biological clues to why women may be more likely than men to develop Alzheimer’s disease and how this most common form of dementia varies by sex.

A healthy lifestyle can cut your risk of developing Alzheimer’s or other forms of dementia even if you have genes that raise your risk for these mind-destroying diseases, a large study has found.

People with a DNA mutation that reduces their chance of HIV infection may die sooner, according to a study that suggests tinkering with a gene to try to fix one problem may cause others.

They were born without a working germ-fighting system, every infection a threat to their lives. Now eight babies with “bubble boy disease” have had it fixed by a gene therapy made from one of the immune system’s worst enemies — HIV, the virus that causes AIDS.

A Chinese researcher claims that he helped make the world’s first genetically edited babies — twin girls born this month whose DNA he said he altered with a powerful new tool capable of rewriting the very blueprint of life. If true, it would be a profound leap of science and ethics. A U.S.