If it is safe, the medicine could also be used for patients who have a single copy of the defective gene.

FORBES

Those who have a single copy of the bad gene still suffer from very elevated cholesterol and a high risk of heart attack, and might also use 301012.

FORBES: Cholesterol Comeback

In the 1950s Anthony Allison, a British biochemist, observed that Africans who carry a single copy of the genetic mutation that causes sickle-cell anaemia are protected against malaria.

ECONOMIST: Genetics and infectious disease: The germ of an idea | The

In a subgroup of families who had identical chromosome markers, those with no mutations in the gene developed symptoms at an average age of about 61, those with a single abnormal copy of parkin at around age 50, and those who inherited two mutated copies had onset at around age 36.

BBC: NEWS | Health | Gene 'predicts' Parkinson's onset

Some 600, 000 Americans have the more common form of FH, which is caused by a single bad copy of the cholesterol gene and causes levels of cholesterol that are just above the upper limit of normal.

FORBES: Genzyme Eyes Isis Drug

Among families with parkin mutations, 13 had at least one member with mutations on both copies of the gene, while in 10 families affected members had a single mutated copy of parkin.

BBC: NEWS | Health | Gene 'predicts' Parkinson's onset

Instead of a traditional key stored in the secure element's memory, every single copy of this chip carries a unique fingerprint within the physical structure of its transistors.

ENGADGET