Autoimmune hepatitis is a disease in which the bodyâs immune system attacks liver cells of the same organism. This causes the liver to become inflamed, resulting in hepatitis.
1 Gene mutations that occur after birth. 2  Most gene mutations occur after you're born and aren't inherited. 3  A number of forces can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.
The causes of mutations. 1. DNA fails to copy accurately. Most of the mutations that we think matter to evolution are naturally-occurring.. For example, when a cell divides, it makes a copy of its DNA  and sometimes the copy is not quite perfect.That small difference from the original DNA sequence is a mutation.. DNA fails to copy accurately. Most of the mutations that we think matter to evolution are naturally-occurring.. For example, when a cell divides, it makes a copy of its DNA  and sometimes the copy is not quite perfect. That small difference from the original DNA sequence is a mutation.