gahgu133aSYMBOL         package:gahgu133a.db         R Documentation

_M_a_p _b_e_t_w_e_e_n _p_r_o_b_e_s_e_t _a_n_d _G_e_n_e _S_y_m_b_o_l_s

_D_e_s_c_r_i_p_t_i_o_n:

     gahgu133aSYMBOL is an R object that provides mappings between
     probeset and gene abbreviations. gahgu133aSYMBOL2PROBE provides
     the reverse mapping.

_D_e_t_a_i_l_s:

     Each probeset is mapped to an abbreviation for the corresponding
     gene. An 'NA' is reported if there is no known abbreviation for a
     given gene.

     Symbols typically consist of 3 letters that define either a single
     gene (ABC) or multiple genes (ABC1, ABC2, ABC3). Gene symbols can
     be used as key words to query public databases such as Entrez
     Gene.

     Mappings were based on data provided by: Genecards (
     http://www.genecards.org ) on 2009-mag06

_R_e_f_e_r_e_n_c_e_s:

     <URL: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene>

_E_x_a_m_p_l_e_s:

             x <- gahgu133aSYMBOL
             # Get the probe identifiers that are mapped to a gene symbol
             mapped_probes <- mappedkeys(x)
             # Convert to a list
             xx <- as.list(x[mapped_probes])
             if(length(xx) > 0) {
               # Get the SYMBOL for the first five probes
               xx[1:5]
               # Get the first one
               xx[[1]]
             }

