Iro Uikka clutches his throat as he describes the violent clash that led to spending his nights sleeping in New York City subway cars.

"When I told my mother I was gay, she grabbed me by the neck and threw me out," he says. "Then she threw my coat on top of me and shut the door."

That was five years ago when he was 18, still living at home in Florida.

Uikka is among tens of thousands of homeless youths across America who are LGBT -- lesbian, gay, bisexual or transgender. Most are on the streets because they have nowhere else to go -- outcasts who leave home after being rejected by family members or flee shelters because residents bully or beat them.

LGBT young people represent a dramatically high proportion of an estimated 600,000 or more homeless youths across the country -- between 20 percent and 40 percent, according to the National Gay and Lesbian Task Force Policy Institute. But only about 5 percent of youths identify themselves as lesbian, gay or bisexual, according to the federal Centers for Disease Control and Prevention.

"We've won battles for gay marriage and gays in the military," says Carl Siciliano, founder and executive director of the New York-based Ali Forney Center, the nation's largest organization for LGBT youth. "This is the next frontier, the next battle: helping these youths."

The White House has taken notice. Members of the Obama administration are hosting a national conference on housing and homelessness in America's LGBT communities on Friday in Detroit.

They'll discuss these issues with advocates, community leaders and the public.

Detroit City Council president Charles Pugh, who is openly gay, is one of the participants.

Detroit has the only nonprofit agency in the Midwest that focuses on LGBT youth -- the Ruth Ellis Center, co-host of today's conference. But the largely voiceless, powerless youth are fighting to survive from coast to coast.

Lesbian, gay and bisexual youth are about four times more likely to attempt suicide than their straight peers, according to the CDC. And one in three is thrown out by their parents, according to data collected from youth across the country by the Family Acceptance Project at San Francisco State University.

On any given day there are almost 4,000 homeless youths in New York City, and at least 1,000 are LGBT, according to a 2008 census released by the City Council. Meager government funds and private donations cover about 350 New York beds for homeless youth. Hundreds more are on waiting lists, providers say.

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