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Articles 1 - 5 of 5

Full-Text Articles in Molecular Biology

Caenorhabditis Elegans Alg-1 Antimorphic Mutations Uncover Functions For Argonaute In Microrna Guide Strand Selection And Passenger Strand Disposal, Anna Y. Zinovyeva, Isana Veksler-Lublinsky, Ajay A. Vashisht, James A. Wohlschlegel, Victor R. Ambros Sep 2015

Caenorhabditis Elegans Alg-1 Antimorphic Mutations Uncover Functions For Argonaute In Microrna Guide Strand Selection And Passenger Strand Disposal, Anna Y. Zinovyeva, Isana Veksler-Lublinsky, Ajay A. Vashisht, James A. Wohlschlegel, Victor R. Ambros

Program in Molecular Medicine Publications and Presentations

MicroRNAs are regulators of gene expression whose functions are critical for normal development and physiology. We have previously characterized mutations in a Caenorhabditis elegans microRNA-specific Argonaute ALG-1 (Argonaute-like gene) that are antimorphic [alg-1(anti)]. alg-1(anti) mutants have dramatically stronger microRNA-related phenotypes than animals with a complete loss of ALG-1. ALG-1(anti) miRISC (microRNA induced silencing complex) fails to undergo a functional transition from microRNA processing to target repression. To better understand this transition, we characterized the small RNA and protein populations associated with ALG-1(anti) complexes in vivo. We extensively characterized proteins associated with wild-type and mutant ALG-1 and ...


Highly Selective In Vivo Labeling Of Subcutaneous White Adipocyte Precursors With Prx1-Cre, Joan Sanchez-Gurmaches, Wen-Yu Hsiao, David A. Guertin Apr 2015

Highly Selective In Vivo Labeling Of Subcutaneous White Adipocyte Precursors With Prx1-Cre, Joan Sanchez-Gurmaches, Wen-Yu Hsiao, David A. Guertin

Program in Molecular Medicine Publications and Presentations

The origins of individual fat depots are not well understood, and thus, the availability of tools useful for studying depot-specific adipose tissue development and function is limited. Cre drivers that selectively target only brown adipocyte, subcutaneous white adipocyte, or visceral white adipocyte precursors would have significant value because they could be used to selectively study individual depots without impacting the adipocyte precursors or intrinsic metabolic properties of the other depots. Here, we show that the majority of the precursor and mature subcutaneous white adipocytes in adult C57Bl/6 mice are labeled by Prx1-Cre. In sharp contrast, few to no brown ...


The Ino80 Complex Prevents Invasion Of Euchromatin Into Silent Chromatin, Yong Xue, Christopher Van, Suman K. Pradhan, Trent Su, Jason Gehrke, Benjamin G. Kuryan, Tasuku Kitada, Ajay Vashisht, Nancy Tran, James Wohlschlegel, Craig L. Peterson, Siavash K. Kurdistani, Michael F. Carey Feb 2015

The Ino80 Complex Prevents Invasion Of Euchromatin Into Silent Chromatin, Yong Xue, Christopher Van, Suman K. Pradhan, Trent Su, Jason Gehrke, Benjamin G. Kuryan, Tasuku Kitada, Ajay Vashisht, Nancy Tran, James Wohlschlegel, Craig L. Peterson, Siavash K. Kurdistani, Michael F. Carey

Program in Molecular Medicine Publications and Presentations

Here we show that the Ino80 chromatin remodeling complex (Ino80C) directly prevents euchromatin from invading transcriptionally silent chromatin within intergenic regions and at the border of euchromatin and heterochromatin. Deletion of Ino80C subunits leads to increased H3K79 methylation and noncoding RNA polymerase II (Pol II) transcription centered at the Ino80C-binding sites. The effect of Ino80C is direct, as it blocks H3K79 methylation by Dot1 in vitro. Heterochromatin stimulates the binding of Ino80C in vitro and in vivo. Our data reveal that Ino80C serves as a general silencing complex that restricts transcription to gene units in euchromatin.


Ciliary Proteins Bbs8 And Ift20 Promote Planar Cell Polarity In The Cochlea, Helen L. May-Simera, Ronald S. Petralia, Mireille Montcouquiol, Ya-Xian Wang, Katherine B. Szarama, Yun Liu, Weichun Lin, Michael R. Deans, Gregory J. Pazour, Matthew W. Kelley Feb 2015

Ciliary Proteins Bbs8 And Ift20 Promote Planar Cell Polarity In The Cochlea, Helen L. May-Simera, Ronald S. Petralia, Mireille Montcouquiol, Ya-Xian Wang, Katherine B. Szarama, Yun Liu, Weichun Lin, Michael R. Deans, Gregory J. Pazour, Matthew W. Kelley

Program in Molecular Medicine Publications and Presentations

Primary cilia have been implicated in the generation of planar cell polarity (PCP). However, variations in the severity of polarity defects in different cilia mutants, coupled with recent demonstrations of non-cilia-related actions of some cilia genes, make it difficult to determine the basis of these polarity defects. To address this issue, we evaluated PCP defects in cochlea from a selection of mice with mutations in cilia-related genes. Results indicated notable PCP defects, including mis-oriented hair cell stereociliary bundles, in Bbs8 and Ift20 single mutants that are more severe than in other cilia gene knockouts. In addition, deletion of either Bbs8 ...


A Laminin 511 Matrix Is Regulated By Taz And Functions As The Ligand For The Alpha6bbeta1 Integrin To Sustain Breast Cancer Stem Cells, Cheng Chang, Hira Lal Goel, Huijie Gao, Bryan M. Pursell, Leonard D. Shultz, Dale L. Greiner, Sulev Ingerpuu, Manuel Patarroyo, Shiliang Cao, Elgene Lim, Junhao Mao, Karen Kulju. Mckee, Peter D. Yurchenco, Arthur M. Mercurio Jan 2015

A Laminin 511 Matrix Is Regulated By Taz And Functions As The Ligand For The Alpha6bbeta1 Integrin To Sustain Breast Cancer Stem Cells, Cheng Chang, Hira Lal Goel, Huijie Gao, Bryan M. Pursell, Leonard D. Shultz, Dale L. Greiner, Sulev Ingerpuu, Manuel Patarroyo, Shiliang Cao, Elgene Lim, Junhao Mao, Karen Kulju. Mckee, Peter D. Yurchenco, Arthur M. Mercurio

Molecular, Cell and Cancer Biology Publications

Understanding how the extracellular matrix impacts the function of cancer stem cells (CSCs) is a significant but poorly understood problem. We report that breast CSCs produce a laminin (LM) 511 matrix that promotes self-renewal and tumor initiation by engaging the alpha6Bbeta1 integrin and activating the Hippo transducer TAZ. Although TAZ is important for the function of breast CSCs, the mechanism is unknown. We observed that TAZ regulates the transcription of the alpha5 subunit of LM511 and the formation of a LM511 matrix. These data establish a positive feedback loop involving TAZ and LM511 that contributes to stemness in breast cancer.