Genetic variants that affect mitochondria, the organelles that power cells, may increase the risk of autism.

Some individuals who have autism mutations show no signs of the condition; understanding why may lead to treatments.

Scientists campaign for elected office in record numbers, folate autoantibodies are common in autism families, and neurons form a genetic mosaic in the brain.

People with autism who have rare, damaging mutations tend to have low scores on intelligence tests.

Children with autism may have an excess of spontaneous mutations in DNA that controls the expression of autism genes.

About 17 percent of children with autism are calmer and more communicative than usual when they have a fever.

Mutations that appear in only some of the body’s cells contribute to autism in about 4 percent of people with the condition.

Children with autism are genetically more similar to one another than to a group of unaffected siblings.

Scientists this week announced the release of nearly 7,000 whole-genome sequences from a collection of families that each have one child with autism.

About 8 percent of non-inherited mutations in people with autism occur in only some of the body’s cells, according to a study of 20,000 people.