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                    Laboratory of Cell & Molecular Biology
    Laboratory of Cell & Molecular Biology
        
            Karen Usdin, Ph.D.Karen Usdin, Ph.D.
        Acting Chief
            karenu@nih.gov

        Studying the organization, compartmentalization, and biochemistry of eukaryotic cells and the pathology associated with disease.
                About the Lab
        
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    Lab Sections
            About the Lab
Lab Sections and Chiefs
    Cell Biochemistry Section
                    John A. Hanover, Ph.D.
                Gene Structure and Disease Section
                    Karen Usdin, Ph.D.
                RNA Biology Section
                    Astrid D. Haase, M.D., Ph.D.
                Section of Genetics and Physiology
                    Lothar Hennighausen, Ph.D.
                Structural Cell Biology Section
                    Jenny E. Hinshaw, Ph.D.
Cell Biochemistry Section
        John A. Hanover, Ph.D.,
Section Chief
    The Cell Biochemistry Section employs diverse genetic and biochemical tools to understand mechanisms of nutrient sensing and nuclear-cytoplasmic regulation. Researchers are interested in organelle biogenesis, innate immunity, and developmental plasticity. The central focus of the Section is understanding how nutrient availability may influence disease susceptibility in the current population through transgenerational epigenetic influences such as O-GlcNAc cycling.
    
        Visit Section PageGene Structure and Disease Section
        Karen Usdin, Ph.D.,
Section Chief
    The Gene Structure and Disease Section is interested in understanding the relationship between mutation and disease pathology in genetic disorders where the mutation occurs outside of the open reading frame, and thus where the consequences of the mutation are not immediately obvious. In particular we are interested in understanding the molecular basis of the unusual mutation that is responsible for the Fragile X-related disorders (FXDs) and the unusual consequences of this mutation for human health.
    
        Visit Section PageRNA Biology Section
        Astrid D. Haase, M.D., Ph.D.,
Section Chief
    The RNA Biology Section studies the function of small non-coding RNAs in genome surveillance. A particular class of small RNAs, PIWI-interacting RNAs (piRNAs), silence mobile genetic elements in germ cells and thus guard genomic integrity and ensure fertility in animals. Combining Drosophila genetics, biochemistry and next-generation sequencing our research aims to elucidate mechanisms of piRNA silencing and to further our understanding of fundamental mechanisms that survey and guard genomic integrity.
    
        Visit Section PageSection of Genetics and Physiology
        Lothar Hennighausen, Ph.D.,
Section Chief
    The section (1) conducts genetic studies to understand how hormones control genes in the mammary gland; (2) uses genome-wide technologies to investigate the activation of chromatin; (3) uses advanced genetic engineering to investigate regulatory elements that control genes in mammals; (4) investigates the accuracy of novel gene editing technologies in mammals.
    
        Visit Section PageStructural Cell Biology Section
        Jenny E. Hinshaw, Ph.D.,
Section Chief
    The Structural Cell Biology Section studies membrane and protein recycling within eukaryotic cells.  Researchers examine the structure and function of proteins involved in these processes by transmission electron microscopy, including cyro-electron microscopy, and by biochemical methods. Presently, Section scientists are investigating a 100 kDa GTPase called dynamin.  Dynamin is involved in the constriction and fission of clathrin-coated pits from plasma membrane during receptor-mediated endocytosis and during membrane retrieval in nerve terminals.  Researchers in the Section have shown that dynamin self-assembles into spirals and onto lipid bilayers to form dynamin decorated lipid tubes.  These tubes undergo a large conformational change upon GTP addition, which results in membrane constriction.  To understand further the mechanism of dynamin-induced membrane constriction, staff members have solved the 3-dimensional structure of dynamin in the non-constricted and constricted states by high-resolution electron microscopy and image processing methods.  This work suggests a GTP-induced conformational change within the dynamin oligomer is responsible for constriction.  Additional dynamin family members are implicated in numerous fundamental cellular processes, including other membrane fission events, anti-viral activity, cell plate formation, and chloroplast biogenesis.  Current work examines the effects of GTP on these proteins to determine if a common mechanism of action exists for all dynamin family members.
    
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        Last Reviewed March 2024 Contact Us
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