Dear Amy: I was conceived via a sperm donor and my parents, who are very private, never told me. Via a DNA testing site, I was able to figure out the identity of the sperm donor and wrote to him. I ...

DNA methylation is an epigenetic modification characterized by the addition of a methyl group to a DNA molecule. As DNA methylation is implicated in both normal biological processes, such as ...

DEAR AMY: I had my DNA tested, as have some of my second cousins, and in one case the results are disturbing. One cousin’s paternal grandfather and my maternal grandmother were siblings, but our ...

I recently completed genetic testing and learned that my brother and I are half-siblings. We have the same mother, but we do not have the same father. Fortunately, my mother (who is in her late 80s) ...

Dear Amy: About five years ago, I found out through DNA testing that my third child (age 31), is not my biological son. I learned this after divorcing my wife. My ex will not discuss this issue with ...

Dear Amy: You have had a number of letters regarding disclosure of DNA results to relatives, etc. I am 84, and I have just learned through DNA testing that I am illegitimate. My biological father and ...

Dear Amy: You frequently encourage people to pursue their DNA heritage. My two siblings found out that their biological father is entirely unknown. Knowing this has definitively destroyed the ...

Dear Amy: After 36 years, I found out via a DNA test that the father of my daughter was the product of a one-night stand, and that she is not the daughter of the man I married. All those years ago, ...