Now Mr. Doctoroff, like many other relatives of Lou Gehrig’s disease victims, worries that he or his children may someday develop the illness.
But unlike many, he is in a position to try to do something about it. At a time when scientists are making rapid gains in the genetic roots of many diseases, Mr. Doctoroff, a former deputy mayor and private equity investor, is working with Mayor Michael R. Bloomberg and a private equity director, David M. Rubenstein, to put together a $25 million package of donations to support research to try to cure this rare and usually fatal degenerative neurological illness.
“This is a devastating disease,” Mr. Doctoroff said in an interview this week in the glass high-rise on the Upper East Side that houses Bloomberg L.P., the mayor’s media and financial information company, where Mr. Doctoroff is now chief executive. “Up to now, there’s been basically no hope. I have the resources, and I think it’s my obligation to do that.”
The gift is part of a wave of investment based on the booming field of genomic analysis. The money will go to a project called Target A.L.S., a consortium of at least 18 laboratories, including ones at Columbia and at Johns Hopkins, the mayor’s alma mater, working to find biological “targets,” like gene mutations, and the biochemical changes they cause in the spinal cord, that could be used to test potential drug therapies for the disease, formally known as amyotrophic lateral sclerosis.
It comes on top of a previous $15 million gift by Mr. Doctoroff, Bloomberg Philanthropies and other donors. By comparison, the National Institutes of Health, the single largest source of research financing for the disease, expects to give $44 million in 2013.
This is not Mr. Bloomberg’s first time supporting charitable causes that are dear to his close associates. The mayor quietly gave at least $1 million to put the name of his top deputy mayor, Patricia E. Harris, on a new academic center at her alma mater, Franklin & Marshall College in Lancaster, Pa.
Mr. Doctoroff said the conversation about A.L.S. in which he got Mr. Bloomberg involved “lasted about five seconds.” He declined to say what share of the money each of the three donors was giving.
Mr. Rubenstein, a founder of the Carlyle Group, said Wednesday that he had long been fascinated with A.L.S. because of its association with Gehrig, the baseball player who died of it. He wondered why more than 70 years later so little progress had been made in treating it.
He said he jumped at the chance to join in because he thought that A.L.S. research was underfinanced owing to the rarity of the disease, and that even a small amount of money could make a big difference.
In the Bloomberg administration, where he was deputy mayor for economic development and rebuilding from 2002 to 2008, Mr. Doctoroff was best known for his dogged — and ultimately dashed — attempt to bring the 2012 Olympics to New York City. (London got the Games.) Now that he has left City Hall, he no longer rides his bike to work — he says the 2.6-mile route from the Upper West Side to his office is too short — but he sometimes runs.
At Bloomberg, he sits in front of a conference room with walls of hot-pink glass, while carp swim in a giant fish tank nearby. He keeps no family photos or other personal mementos on his desk, and talking about his family’s disease history does not seem easy for him.
A.L.S. is rare, with about 2 new cases diagnosed a year per 100,000 people, according to the A.L.S. Association. A vast majority of cases are “sporadic,” in people who have no family history, while only 5 to 10 percent of cases are inherited. There appear to be no racial, ethnic or socioeconomic predispositions.
There is some speculation about environmental factors, like exposure to toxic chemicals and high physical activity that athletes might endure, “but nothing firm,” said Christopher E. Henderson, a researcher at Columbia and the Target A.L.S. project’s scientific director. Some researchers suspect a link between A.L.S. and head trauma suffered by professional football players.
Mr. Doctoroff’s father, Martin, an appeals court judge in Michigan, received the diagnosis in 2000 and died in 2002. One of Martin Doctoroff’s brothers, Michael, was found to have the disease in 2009 and died in 2010.
“When my father contracted the disease and passed away, it was very easy to chalk it up to bad luck,” Mr. Doctoroff said. “When my uncle got it, it obviously had broader implications.”
Given his family history, Mr. Doctoroff estimates that there is a 50-50 chance that he has the gene, C9orf72, that could lead to A.L.S. But he has chosen not to be tested, which would have implications not just for him but for his three children. “It’s very personal, but I’m not sure that I want to know,” he said.
Even when family members develop the disease, it can occur at vastly different ages, so he could still be in suspense even after testing. “Assuming you have the gene, you don’t know when you would actually get the disease,” he said. His uncle was 71. His father was 66. He is now 54.
Sheelagh McNeill contributed reporting.
This article has been revised to reflect the following correction:
Correction: February 8, 2013
Because of an editing error, a picture caption on Thursday with an article about efforts by Daniel L. Doctoroff, a former deputy mayor of New York, to research Lou Gehrig’s disease misstated his title at Bloomberg L.P. in some editions. He is the chief executive, not the executive director.
