Researchers say they have found a gene that appears to offer some protection from HIV, and that could also delay the onset of full-blown AIDS in those who do become infected. Could the discovery of the gene help in vaccine development? In this hour, we'll look at the genetics of HIV infection. We'll also get an update on the ongoing struggle to develop a vaccine.

Plus, some researchers say the risk of of breast cancer in women with the BRCA1 and BRCA2 gene mutations has been overstated. We'll look at the controversy surrounding breast cancer genes and breast cancer risk.

Call in with your questions and comments at 1-800-989-8255 (2-3 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Marisa Weiss
Oncologist
President and Founder, www.breastcancer.org
Author, "Living Beyond Breast Cancer"
Narberth, Pennsylvania

Sunil Ahuja, MD
Professor of Medicine and Microbiology and Immunology
Director, VA HIV/AIDS Center
University of Texas Health Science Center
San Antonio, Texas

Colonel Matthew Dolan, MD
United States Air Force
Director, Defense Institute for Medical Operations
Brooks City Air Force Base
San Antonio, Texas

Jonathan Stoye
Head, Division of Virology
Medical Research Council, National Institute for Medical Research
London, United Kingdom

Sarah Schlesinger, MD
Research Associate Professsor
Rockefeller University and Aaron Diamond AIDS Research Center
New York, New York

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This segment produced by Annette Heist