Investigators in the Nancy Guthrie case have turned to genetic genealogy as they try to make the most of potential DNA evidence.

Authorities are analyzing biological evidence in the search for Nancy Guthrie nearly three weeks after Savannah Guthrie's mom was last seen.

For the first time, researchers have succeeded in developing an artificial DNA base pair that is based on a different chemical force than natural genetic material. While the common natural DNA building blocks are held together by hydrogen bonds,

The DNA profile was recovered from gloves found during the investigation into the disappearance of Nancy Guthrie in Arizona.

Over four decades after a teenager was murdered, DNA found on a discarded cigarette has helped authorities catch her killer. Sarah Geer, 13, was last seen leaving her friend’s house in Cloverdale, California,

DNA is the blueprint of life. Genes encode proteins and serve as the body's basic components. However, building a functioning organism also requires precise instructions about when, where, and how much those components should be produced.

A new study has analyzed mummified remains of cheetahs in Saudi Arabia caves. The results could help reintroduce cheetahs to the Arabian Peninsula, researchers say.

As the search for Nancy Guthrie extends into day 20, investigators are now turning to a technique called genetic genealogy to find those responsible for her disappearance.