Hannah L. Klein

Hannah L. Klein

Professor, Department of Biochemistry and Molecular Pharmacology

Professor, Department of Medicine

Professor, Department of Pathology

pathways of DNA damage avoidance, DNA repair and recombination, genomic instability, DNA damage checkpoints, cancer

Genome Instability and DNA Damage Pathways

We have two areas of investigation to study DNA damage pathways and how damage repair is regulated.  As DNA damage is increased in many tumor cells, identification fo pathways of genome maintenance is important for understanding how damage can arise, the consequences of DNA damage and how it can be prevented.  The first area is focused on the regulation of DNA motor proteins.  These proteins move along the DNA duplex and remove proteins that are obstacles to sensing and completing homologous recombination (HR) to repair DNA damage.  We have found that modification of the motor proteins through phosphorylation is key to regulating their action and limiting HR to act in the right situation.  Too much HR or too little HR are both able to destabilize the genome, so regulation of these key proteins is essential to maintain the right balance of HR.

A second area of research centers around the occurrence of aberrant intermediates in DNA.  Although DNA is composed primarily of deoxyribonucleotide residues, at a significant frequency ribonucleotide residues are misincorporated into DNA instead.  Ribonucleotides in DNA are recognized and removed by an enzyme called RNase H2, but when this process is defective, DNA damage is increased and several genome errors occur, including mutations, chromosome loss and increased HR.  We have identified some of the proteins that protect the genome against damage from ribonucleotides in DNA, and are continuing to study the mechanisms by which they maintain the genome.

Lab Address: 
ACLS Building, 3rd Floor
450 East 29th Street
New York, NY 10016
Phone: 212-263-5952





Academic office

NYU Langone Medical Center, 550 First Avenue

Smilow 201

New York, NY 10016

Lab Website
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These focus areas and their associated publications are derived from medical subject headings from PubMed.
represents one publication

Professor, Department of Biochemistry and Molecular Pharmacology

Professor, Department of Medicine

Professor, Department of Pathology

Co-Course Director, Current Topics in Genome Integrity

Course Director, Genetics

Vice Chair, Department of Biochemistry and Molecular Pharmacology

Potenski, Catherine J; Niu, Hengyao; Sung, Patrick; Klein, Hannah L

Nature. 2014 Jul 10; 511(7508):251-254

Niu, Hengyao; Potenski, Catherine J; Epshtein, Anastasiya; Sung, Patrick; Klein, Hannah L

Cell cycle. 2016; 15(3):331-336

Potenski, Catherine J; Klein, Hannah L

Nucleic acids research. 2014; 42(16):10226-10234

Shah, Parisha P; Zheng, Xiuzhong; Epshtein, Anastasiya; Carey, Jeffrey N; Bishop, Douglas K; Klein, Hannah L

Molecular cell. 2010 Sep 24; 39(6):862-872

Klein, Hannah L

DNA repair (Amsterdam). 2017 Jun 9; 56:26-32

Niu, Hengyao; Klein, Hannah L

FEMS yeast research. 2017 Mar 1; 17(2):?-?

Jinks-Robertson, Sue; Klein, Hannah L

Nature structural & molecular biology. 2015 Mar; 22(3):176-178