Few things are more sacrosanct in TV than a network’s logo. But today, 29 channels across the cable dial will turn their logos blue in recognition of World Autism Awareness Day.

AMC, FX, MTV, Comedy Central, Food Network, Animal Planet, TV Land and a host of other outlets will incorporate the color blue into their logos and other branding initiatives throughout the day in an effort to raise awareness of the need for medical research and early diagnosis for children on the autism spectrum.

The azure blue color has become associated with autism advocacy efforts through the work of Autism Speaks, the nonprofit org founded in 2005 by former NBC topper Bob Wright and his wife, Suzanne, who have a grandson with autism.

The cablers will also carry a 15-second public service announcement aimed at educating the public about the issues facing children and adults who are affected by the developmental brain disorder.

“Autism impacts 1 in 88 children in the United States — 1 in 54 boys — and through the extraordinary support of such wide-ranging cable television networks we are raising awareness and building support by delivering an important message about autism to millions of people watching television today,” Wright said.

Wright is a board member of AMC Networks, which spearheaded the TV campaign for Autism Speaks’ third annual “Light It Up Blue” awareness campaign. The United Nations designated April 2 as World Autism Awareness Day in 2007.