ABSTRACT - Howard Univ plans to create nation's largest repository of DNA from African-Americans, saying black people are in danger of being left behind at newest frontier of medical research; samples would be used to find genes involved in diseases with particularly high rates among blacks like hypertension and diabetes; plan is to gather blood samples or cheek swabs from 25,000 people over five years, mainly patients at hospitals associated with Howard College of Medicine; Dr Floyd J Malveaux, dean of medical school, says health concerns of blacks have often not received enough attention; genetic studies of ethnic groups raise concerns because of fears that they could be used or distorted to justify discrimination against group or to promote stereotypes; international project to study genetic differences among ethnic populations was abandoned in 1990's after some groups argued that information might be used to exploit them; Dr Randall W Maxey, president of National Medical Assn, which represents black doctors, says involvement of Howard should allay fears that information might be misused (M) Saying black people are in danger of being left behind at the newest frontier of medical research, Howard University plans to create the nation's largest repository of DNA from African-Americans.

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