This is a podcast interview with Phillip Sharp, a Nobel laureate and professor at MIT. He recounts his career, from his upbringing on a farm in Kentucky to his foundational discovery of RNA splicing. The discussion covers the key experiments using adenovirus that revealed split genes, a finding that reshaped molecular biology. Sharp explains how this led to the characterization of the spliceosome and the concept of alternative splicing, which generates vast proteomic diversity from a limited genome. He also discusses his significant role in the biotechnology industry, co-founding companies like Biogen and Alnylam. He offers his perspective on the evolution of biological technology, from recombinant DNA to modern genomics and CRISPR, and advocates for GMOs to address future food security challenges. Finally, he stresses the importance of taking calculated risks and seeking mentorship for a successful scientific career. As far as I can tell, it's a standard "great scientist" interview.
A Conversation with Phillip Sharp: From RNA Splicing to Biotech
0:04:39 From Farm to MIT: Sharp details his background, starting on a Kentucky farm, majoring in chemistry and math, and overcoming initial academic struggles to earn a Ph.D. He then moved through postdoctoral work at Caltech and a position at Cold Spring Harbor before joining MIT in 1974.
0:08:18 The Puzzle of RNA: His interest in RNA processing stemmed from the puzzling observation that nuclear RNA was much longer than the corresponding cytoplasmic mRNA. He chose to use DNA tumor viruses, specifically adenovirus, as a model system to investigate this discrepancy.
0:11:07 The Splicing Discovery: The key experiment involved mapping adenovirus messenger RNA. His lab observed that the 5' end of the mRNA was composed of sequences from three non-contiguous upstream regions of the viral genome, which provided direct evidence for RNA splicing.
0:14:31 Unraveling the Spliceosome: The discovery of splicing launched further investigation into the mechanism, leading to the identification of the spliceosome complex and the lariat intermediate. This work established how alternative splicing allows a small number of genes (~23,000) to produce hundreds of thousands of different proteins.
0:19:06 Revolutions in Technology: Sharp contrasts the recombinant DNA technology revolution of the 1970s with the current revolution driven by genomics, deep sequencing, and gene editing technologies like CRISPR. He notes that these advances are providing a more holistic, systems-level view of cell biology.
0:23:33 On GMOs and Global Challenges: He is strongly pro-GMO, arguing that genetically modified plants are necessary to feed the projected global population of 9 billion by mid-century by enabling agriculture in challenging environments (e.g., high salinity, low water).
0:26:49 Beyond the Lab: Biotech and Mentorship: While the discovery of split genes is his most significant scientific contribution, he also highlights the impact of his students (e.g., Nobel laureate Andy Fire) and his role in co-founding major biotech companies, including Biogen and Alnylam, which have developed major therapeutics.
0:31:38 Advice to Young Scientists: Sharp’s primary advice is for young scientists to take more risks and choose less-traveled paths rather than safe, conventional career tracks. He believes this is where the greatest opportunities lie.
0:32:41 The Critical Role of Mentors: He emphasizes that mentors were incredibly important at every stage of his career, from his high school math teacher to David Baltimore at MIT. He advises actively seeking out experienced people for unbiased guidance.