Month: February 2016

    Addition of 3′ A overhangs to PCR products

    If PCR is performed using a proofreading DNA polymerase, such as Pfu DNA polymerase, the product will have blunt ends. Taq DNA polymerase catalyzes the non-template directed addition of an adenine residue to the 3´-end of both strands of DNA molecules to make it suitable for TA cloning.


    Categories: 科技

    pan-neuronal genes

    Despite remarkable variation in morphology and function,
    all neurons possess a set of attributes that allow their
    assignment to this cell type (Kandel et al., 2000). These
    features are likely determined by genes, called pan-neuronal
    genes, uniquely expressed in all (or nearly all) neurons, but not
    in other cell types. However, in many instances broadly
    expressed neuronal genes are also expressed in other cell types
    (Iwasaki et al., 1997; Nonet et al., 1999; Rajaram et al., 1999;
    Sieburth et al., 2005). Characterization of such broadly
    expressed neuronal genes (a term we will use interchangeably
    with pan-neuronal) has a potential to uncover the genetic
    modules that give neurons their distinctive features. Identification
    of these genes has lagged behind the progress made toward
    understanding the mechanisms of neuronal subtype specification
    (Melkman and Sengupta, 2004; Shirasaki and Pfaff, 2002;
    Thor and Thomas, 2002). The identification of these genes may
    also provide clues to the molecular mechanisms that regulate
    their expression. If subsets of pan-neuronal genes are controlled
    by a common set of transcription factors, they are likely to share
    transcription factor binding sites in their cis-regulatory regions
    (Zhang, 1999). We investigated this possibility by searching for
    sequence motifs overrepresented in the promoters of known
    pan-neuronal genes.


    Detection of broadly expressed neuronal genes in C. elegans

    Categories: 科技