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David A. Leib, PhD

Title(s):
Chair and Professor of Microbiology and Immunology

Additional Titles/Positions/Affiliations:
Adjunct Professor of Biology

Department(s):
Microbiology and Immunology

Education:
David Leib received his BSc from The University of Birmingham, UK in 1983 in Biological Sciences. He then received his PhD from The University of Liverpool, UK in 1986 from the Department of Medical Microbiology. He did a postdoctoral fellowship at Harvard University with Dr Priscilla Schaffer from 1987-1990. He was then was appointed to the faculty of Washington University in St Louis where he served as Professor until 2009, before moving to Dartmouth. He became Chair of Microbiology and Immunology in 2018.

Programs:
Immunology Program
Molecular and Cellular Biology Graduate Programs
Molecular Pathogenesis Program

Websites:
Visit the Leib Lab Website at:
https://geiselmed.dartmouth.edu/leib/

Contact Information:

Geisel School of Medicine at Dartmouth
One Medical Center Drive
Borwell Building 630E
Lebanon NH 03756

Office: 603-650-8616
Fax: 603-650-6223
Email: david.a.leib@dartmouth.edu


Professional Interests:

Since its establishment in 1990 my laboratory has studied the pathogenesis and biology of herpes simplex virus (HSV) with an emphasis on studying the interface of the virus and the host. The generation and use of recombinant viruses in a variety of models of infection followed by analysis with functional genomics and cytokine arrays has allowed us to determine the roles of viral and host factors in the outcome of infection. We have developed a number of reagents, techniques, and approaches. These include BACs to rapidly generate recombinant viruses, non-invasive bioluminescence technology to monitor spread and tropism of HSV in real time, and recombinant viruses that are effective as therapeutic vaccines for prevention of recurrent HSV infections (US Patent #5698431). We have also discovered roles for a number of viral genes in the evasion of innate and adaptive immunity, and of autophagy responses, and elucidated roles for host resistance pathways in the control of acute infection.

Herpes simplex virus is a common ocular pathogen causing a variety of diseases ranging from self-limiting dendritic epithelial keratitis, conjunctivitis, and blepharitis to necrotizing stromal keratitis. HSV exhibits two different modes of gene expression during its life cycle. During the replicative phase of infection all of its genes are expressed. During latency, however, viral gene expression is almost completely repressed. Our approach is to manipulate cloned viral genes and then introduce engineered mutations into the viral genome to generate recombinant viruses. We then use these recombinant viruses in vitro and in vivo to allow the study of viral pathogenesis at the molecular level.

MODULATION OF INNATE IMMUNITY
The ability of HSV to evade innate immunity is critical to its success as a pathogen. A number of projects in the lab are focused on the molecular basis of immune evasion and determining the precise genes and domains that are involved. In particular, we are studying the g34.5 of HSV which has multiple cellular binding partners that collectively serve to control the interferon response, global translation rates, autophagy, mitochondrial function, and egress from the cell. g34.5 is therefore a highly versatile and potent determinant of virulence.

MATERNAL IMMUNITY TO HSV AND NEONATAL HSV INFECTIONS
Neonatal herpes simplex virus (nHSV) infections cause devastating morbidity and mortality in infants. Most nHSV cases are associated with primary maternal infection, consistent with the hypothesis that maternal immunity is protective. Our studies show that nHSV can be prevented through maternal vaccination and through administration of therapeutic antibodies whereby protection is passed from the maternal to the fetal circulation. Protection is not only at the level of prevention of virus-induced mortality, but also at the level of prevention of the common neurological complications of nHSV. Through development of behavioral and memory testing we are showing an important connection between HSV infections and behavioral morbidities that may have huge importance in the clinical setting. Permanent behavioral changes may be caused by nHSV in babies born to mothers without preexisting immunity. The maternal virome is therefore likely an important determinant of human health.

Grant Information:

Principal Investigator, NEI RO1 09083 "Viral and host factors in herpetic reactivation", Funded 1992-2021.

Director, Project 3, AI098681 “Innate immunity and the HSV lytic/latent balance”. Program Project (D.M. Coen, Harvard Medical School, Director)
NIH NIAID PO1 “Viral and host mechanisms that tilt the HSV lytic/latent balance”. Funded 2013-2018.


Courses Taught:

Microbiology (undergraduate), Fundamentals of Virology, Advanced Cellular and Molecular Immunology, Cellular and Molecular Basis of Immunity (graduate school), Immunology and Virology (medical school).

Biography:

1983 BSc University of Birmingham (UK).
1986 PhD University of Liverpool (UK).
1987-1990 Postdoctoral fellowship, Harvard University.
1990-2009 Washington University.
2009-Present, Geisel School of Medicine at Dartmouth.


Selected Publications:

 

Maternal immunization confers protection against neonatal herpes simplex mortality and behavioral morbidity.
Patel CD, Backes IM, Taylor SA, Jiang Y, Marchant A, Pesola JM, Coen DM, Knipe DM, Ackerman ME, Leib DA
Sci Transl Med. 2019 Apr 10;11(487) pii: eaau6039. doi: 10.1126/scitranslmed.aau6039.
PMID: 30971454

The ESCRT-Related ATPase Vps4 Is Modulated by Interferon during Herpes Simplex Virus 1 Infection.
Cabrera JR, Manivanh R, North BJ, Leib DA
MBio. 2019 Mar 5;10(2) pii: e02567-18. doi: 10.1128/mBio.02567-18. Epub 2019 Mar 5.
PMID: 30837340

The US11 Gene of Herpes Simplex Virus 1 Promotes Neuroinvasion and Periocular Replication following Corneal Infection.
Charron AJ, Ward SL, North BJ, Ceron S, Leib DA
J Virol. 2019 May 1;93(9) pii: e02246-18. doi: 10.1128/JVI.02246-18. Epub 2019 Apr 17.
PMID: 30760571

The STING agonist 5,6-dimethylxanthenone-4-acetic acid (DMXAA) stimulates an antiviral state and protects mice against herpes simplex virus-induced neurological disease.
Ceron S, North BJ, Taylor SA, Leib DA
Virology. 2019 Mar;529:23-28. doi: 10.1016/j.virol.2019.01.006. Epub 2019 Jan 6.
PMID: 30648635

Neuronal Subtype Determines Herpes Simplex Virus 1 Latency-Associated-Transcript Promoter Activity during Latency.
Cabrera JR, Charron AJ, Leib DA
J Virol. 2018 Jul 1;92(13) pii: e00430-18. doi: 10.1128/JVI.00430-18. Epub 2018 Jun 13.
PMID: 29643250

Role of Herpes Simplex Virus 1 γ34.5 in the Regulation of IRF3 Signaling.
Manivanh R, Mehrbach J, Knipe DM, Leib DA
J Virol. 2017 Dec 1;91(23) pii: e01156-17. doi: 10.1128/JVI.01156-17. Epub 2017 Nov 14.
PMID: 28904192

Isolation, Purification, and Culture of Primary Murine Sensory Neurons.
Katzenell S, Cabrera JR, North BJ, Leib DA
Methods Mol Biol. 2017;1656:229-251. doi: 10.1007/978-1-4939-7237-1_15.
PMID: 28808974

Maternal Antiviral Immunoglobulin Accumulates in Neural Tissue of Neonates To Prevent HSV Neurological Disease.
Jiang Y, Patel CD, Manivanh R, North B, Backes IM, Posner DA, Gilli F, Pachner AR, Nguyen LN, Leib DA
MBio. 2017 Jul 5;8(4) pii: e00678-17. doi: 10.1128/mBio.00678-17. Epub 2017 Jul 5.
PMID: 28679745

Immune- and Nonimmune-Compartment-Specific Interferon Responses Are Critical Determinants of Herpes Simplex Virus-Induced Generalized Infections and Acute Liver Failure.
Parker ZM, Pasieka TJ, Parker GA, Leib DA
J Virol. 2016 Dec 1;90(23):10789-10799. doi: 10.1128/JVI.01473-16. Epub 2016 Nov 14.
PMID: 27681121

Neuronal IFN signaling is dispensable for the establishment of HSV-1 latency.
Rosato PC, Katzenell S, Pesola JM, North B, Coen DM, Leib DA
Virology. 2016 Oct;497:323-327. doi: 10.1016/j.virol.2016.06.016. Epub 2016 Aug 10.
PMID: 27518540

View more publications on PubMed