Nucleotide sequence of the AIDS virus, LAV

Area of Science:

• Retroviral genomics
• Molecular virology
• Human retroviruses

Background:

• Lymphadenopathy-associated virus (LAV) is implicated as the causative agent of Acquired Immunodeficiency Syndrome (AIDS).
• Understanding the genetic makeup of LAV is crucial for developing diagnostic and therapeutic strategies against AIDS.

Purpose of the Study:

• To determine the complete nucleotide sequence of lymphadenopathy-associated virus (LAV).
• To analyze the genetic structure of LAV and identify novel genes or open reading frames.
• To compare the genetic organization of LAV with other known retroviruses, particularly human T cell leukemia/lymphoma viruses.

Main Methods:

• DNA sequencing of the LAV genome.
• Bioinformatic analysis to identify open reading frames (ORFs) and gene structures.
• Comparative genomic analysis.

Main Results:

• The complete 9193-nucleotide sequence of LAV was determined.
• LAV exhibits a unique genetic structure, including the standard retroviral gag, pol, and env genes.
• Two novel open reading frames, designated Q and F, were identified. Q is located between pol and env, and F is partially encoded within the U3 element of the Long Terminal Repeat (LTR).

Conclusions:

• The unique genetic organization of LAV, particularly the presence of novel ORFs Q and F, distinguishes it from previously characterized human T cell leukemia/lymphoma viruses.
• These findings provide critical insights into the molecular basis of LAV and its distinctiveness within the retroviral family.
• The genetic data supports LAV's unique position and may have implications for understanding AIDS pathogenesis.