York Marahrens, Ph.D.


Work Titles
UCLA Adjunct Associate Professor, Human Genetics
Education:
Degrees:
Ph.D.

Contact Information:

Work Email Address:

ymarahrens@mednet.ucla.edu


Work Phone Number:

(310) 267-2466

Laboratory Address:

Laboratory
Gonda Building
Los Angeles, CA 90095


Work Address:

Office
Gonda Building
Los Angeles, CA 90095


Detailed Biography:

York Marahrens was born in Canada. He did his Graduate work with Bruce Stillman at the Cold Spring Harbor Laboratory in New York. For his thesis, he defined the DNA the DNA sequences that constitute a yeast origin of DNA replication. This was followed by post-doctoral work in the lab of Rudolf Jaenisch at the Whitehead Institute at MIT. During his post-doctoral work, Dr. Marahrens generated a mouse knockout to demonstrate that the Xist locus is required for X-inactivation and is also involved in the decision as to which X chromosome is inactivated. His lab at UCLA determined that Xist also controls the chromation of the active X chromosome and the DNA stability of both X chromosomes. His lab has also established links between repetitive sequences, chromatin structure, genome stability and DNA repair proteins.

Publications:

A selected list of publications:

Regelson M, Eller CD, Horvath S, Marahrens Y   A Link Between Repetitive Sequences and Gene Replication Time Cytogenetic and Genome Research , 2006; 112(3-4): 184-193.
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Ouyang T, Kwon YT, An JY, Eller CD, Tsai SC, Diaz-Perez S, Marahrens Y   Loss of Ubr2, an E3 ubiquitin ligase, leads to chromosome fragility and impaired homologous recombinational repair, Mutation Research, 2006; 596: 64-75.
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Stankiewicz P, Kchler A, Eller CD, Sahoo Baldermann TC, Lieser U, Hesse M, Thiele H, Hagemann M, Fiedler E Yatsenko SA, Liehr T, Horsthemke B, Claussen U, Marahrens Y, Lupski JR and Hansmann I   Minimal phenotype in a girl with trisomy 15q due to t(X;15)(q22.3;q11.2) translocation - do LINE-1 elements facilitate spreading of X-inactivation?, American Journal of Medical Genetics, 2006; 140A: 442-452.
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Henson SE, Tsai SC, Malone CS, Soghomonian SV, Ouyang Y, Wall R, Marahrens Y and Michael AT   Pir51, a Rad51-Interacting Protein with High Expression in Aggressive Lymphoma, Controls Mitomycin C Sensitivity and Prevents Chromosomal Breaks, Mutation Research, 2006; in press: .
Goldstine JV, Nahas S, Gamo K, Gartler SM, Hansen RS, Roelfsema JH, Gatti RA, Marahrens Y   Constitutive phosphorylation of ATM in lymphoblastoid cell lines from patients with ICF syndrome without downstream kinase activity, DNA Repair, 2006; in press: .
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Ouyang Y, Salstrom J Diaz-Perez S, Nahas S, Matsuno Y, Dawson D, Teitell MA, Horvath S, Riggs AD, Gatti RA, Marahrens Y   Inhibition of Atm and/or Atr Disrupts Gene Silencing on the Inactive X Chromosome, Biochem Biophys Res Commun, 2005; 337(3): 875-880.
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Diaz-Perez S, Ouyang Y, Perez V, Cisneros R, Regelson M, and Marahrens Y   Element(s) at the non-transcribed Xist locus of the active X chromosome control chromosomal replication timing in the mouse, Genetics, 2005; 171(21): 663-672.
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Hernandez-Munoz I, Lund AH, van der Stoop P, Boutsma E, Muijrers I, Verhoeven E, Nusinow DA, Panning B, Marahrens Y and van Lohuizen M   Stable X-chromosome inactivation requires variant histone MACROH2A, CULLIN3/SPOP dependent ubiquitination and involves dynamic recruitment of the PRC1 polycomb complex, PNAS, 2005; 102(21): 7635-7640.
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Allen E, Horvath S, Tong F, Kraft P, Spiteri E, Riggs AD, Marahrens Y   High concentrations of long interspersed nuclear element sequence distinguish monoallelically expressed genes Proceedings of the National Academy of Sciences of the United States of America. , 2003; 100(17): 9940-5.
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Ganesan S, Silver DP, Greenberg RA, Avni D, Drapkin R, Miron A, Mok SC, Randrianarison V, Brodie S, Salstrom J, Rasmussen TP, Klimke A, Marrese C, Marahrens Y, Deng CX, Feunteun J, Livingston DM   BRCA1 supports XIST RNA concentration on the inactive X chromosome Cell. , 2002; 111(3): 393-405.
McCarrey JR, Watson C, Atencio J, Ostermeier GC, Marahrens Y, Jaenisch R, Krawetz SA   X-chromosome inactivation during spermatogenesis is regulated by an Xist/Tsix-independent mechanism in mouse, Genesis, 2002; 34(4): 257-266.
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Marahrens Y   X-inactivation by chromosomal pairing events Genes & development. , 1999; 13(20): 2624-32.
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Marahrens Y, Loring J and Jaenisch R   Role of the Xistgene in X chromosome choosing, Cell, 1998; 92: 657-664.
Marahrens Y, Panning B, Dausman J, Strauss W and Jaenisch R   Xist-deficient mice are defective in dosage compensation but not spermatogenesis, Genes and Development, 1997; 11: 156-166.
Marahrens Y and Stillman B   The initiation of DNA replication in the yeast Saccharomyces cerevisiae, Eukaryotic DNA Replication, 1996; 66-95.
Marahrens Y, Stillman B   Replicator dominance in a eukaryotic chromosome The EMBO journal. , 1994; 13(14): 3395-400.
Marahrens Y, Stillman B   A yeast chromosomal origin of DNA replication defined by multiple functional elements Science. , 1992; 255(5046): 817-23.

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