Molecular evidence of HIV-1 transmission in a criminal case

doi:10.1073/pnas.222522599

Molecular evidence of HIV-1 transmission in a criminal case

^*Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030; ^‡Department of Ecology and Evolutionary Biology and Museum of Zoology, University of Michigan, Ann Arbor, MI 48109-1079; ^¶School of Dentistry, Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI 48109; and ^**Section of Integrative Biology and Center for Computational Biology and Bioinformatics, University of Texas, Austin, TX 78712

Edited by Walter M. Fitch, University of California, Irvine, CA, and approved September 4, 2002 (received for review May 2, 2002)

Abstract

A gastroenterologist was convicted of attempted second-degree murder by injecting his former girlfriend with blood or blood-products obtained from an HIV type 1 (HIV-1)-infected patient under his care. Phylogenetic analyses of HIV-1 sequences were admitted and used as evidence in this case, representing the first use of phylogenetic analyses in a criminal court case in the United States. Phylogenetic analyses of HIV-1 reverse transcriptase and env DNA sequences isolated from the victim, the patient, and a local population sample of HIV-1-positive individuals showed the victim's HIV-1 sequences to be most closely related to and nested within a lineage comprised of the patient's HIV-1 sequences. This finding of paraphyly for the patient's sequences was consistent with the direction of transmission from the patient to the victim. Analysis of the victim's viral reverse transcriptase sequences revealed genotypes consistent with known mutations that confer resistance to AZT, similar to those genotypes found in the patient. A priori establishment of the patient and victim as a suspected transmission pair provided a clear hypothesis for phylogenetic testing. All phylogenetic models and both genes examined strongly supported the close relationship between the HIV-1 sequences of the patient and the victim. Resampling of blood from the suspected transmission pair and independent sequencing by different laboratories provided precaution against laboratory error.

Footnotes

↵ † To whom correspondence should be addressed. E-mail: mmetzker{at}bcm.tmc.edu.
↵ § Present address: Department of Virus and Cell Biology, Merck Research Laboratories, West Point, PA 19486.
↵ ∥ Present address: Southern Research Institute, Frederick, MD 21701-4756.
This paper was submitted directly (Track II) to the PNAS office.
Data deposition: The sequences reported in this paper have been deposited in the GenBank database (accession nos. –).
Abbreviations:
1. HIV-1, HIV type 1
2. RT, reverse transcriptase
3. BCM, Baylor College of Medicine
4. MIC, University of Michigan
5. PBMC, peripheral blood mononuclear cell
6. AZT, 3′-azido-3′-deoxythymidine
7. BP, bootstrap proportions
8. MCMC, Markov-chain Monte Carlo