0 10 Regulation regulation NN 11 13 of of IN 14 19 human human JJ 20 27 epsilon epsilon NN 28 36 germline germline NN 37 50 transcription transcription NN 50 51 : : : 52 56 role role NN 57 59 of of IN 60 75 B-cell-specific b-cell-specific JJ 76 85 activator activator NN 86 93 protein protein NN 93 94 . . . 96 104 Germline Germline NNP 105 116 transcripts transcript NNS 117 125 initiate initiate VBP 126 130 from from IN 131 140 promoters promoter NNS 141 149 upstream upstream RB 150 152 of of IN 153 156 the the DT 157 171 immunoglobulin immunoglobulin NN 172 178 switch switch NN 179 185 region region NN 185 186 , , , 187 190 and and CC 191 194 are be VBP 195 204 necessary necessary JJ 205 207 to to TO 208 214 target target VB 215 218 the the DT 219 230 appropriate appropriate JJ 231 237 switch switch NN 238 244 region region NN 245 248 for for IN 249 262 recombination recombination NN 263 266 and and CC 267 276 switching switching NN 276 277 . . . 278 287 Different different JJ 288 297 cytokines cytokine NNS 298 306 activate activate VBP 307 320 transcription transcription NN 321 323 at at IN 324 327 the the DT 328 339 appropriate appropriate JJ 340 348 germline germline NN 349 357 promoter promoter NN 357 358 . . . 359 366 Because because IN 367 374 binding bind VBG 375 380 sites site NNS 381 384 for for IN 385 400 B-cell-specific b-cell-specific JJ 401 410 activator activator NN 411 418 protein protein NN 419 420 ( ( ( 420 424 BSAP BSAP NNP 424 425 ) ) ) 426 429 are be VBP 430 437 located located JJ 438 446 upstream upstream RB 447 449 of of IN 450 457 several several JJ 458 464 switch switch NN 465 472 regions region NNS 473 475 in in IN 476 479 the the DT 480 494 immunoglobulin immunoglobulin NN 495 500 heavy heavy JJ 501 506 chain chain NN 507 511 gene gene NN 512 519 cluster cluster NN 519 520 , , , 521 525 BSAP BSAP NNP 526 531 might might MD 532 536 play play VB 537 538 a a DT 539 543 role role NN 544 546 in in IN 547 550 the the DT 551 561 regulation regulation NN 562 564 of of IN 565 573 germline germline NN 574 587 transcription transcription NN 588 591 and and CC 592 599 isotype isotype NN 600 609 switching switching NN 609 610 . . . 611 613 We we PRP 614 626 investigated investigate VBD 627 634 whether whether IN 635 639 BSAP BSAP NNP 640 645 plays play VBZ 646 647 a a DT 648 652 role role NN 653 655 in in IN 656 659 the the DT 660 675 transcriptional transcriptional JJ 676 686 regulation regulation NN 687 689 of of IN 690 693 the the DT 694 701 epsilon epsilon NN 702 710 germline germline NN 711 719 promoter promoter NN 720 722 in in IN 723 728 human human JJ 729 730 B B NNP 731 736 cells cell NNS 736 737 . . . 738 741 Our our PRP$ 742 749 results result NNS 750 756 showed show VBD 757 761 that that IN 762 766 BSAP BSAP NNP 767 772 plays play VBZ 773 774 a a DT 775 779 role role NN 780 782 in in IN 783 787 both both CC 788 802 IL-4-dependent il-4-dependent JJ 803 812 induction induction NN 813 816 and and CC 817 830 CD40-mediated cd40-mediated JJ 831 843 upregulation upregulation NN 844 846 of of IN 847 852 human human JJ 853 860 epsilon epsilon NN 861 869 germline germline NN 870 883 transcription transcription NN 883 884 . . . 885 889 BSAP BSAP NNP 890 892 is be VBZ 893 899 unique unique JJ 900 905 among among IN 906 909 the the DT 910 923 transcription transcription NN 924 931 factors factor NNS 932 936 that that WDT 937 945 regulate regulate VBP 946 953 epsilon epsilon NN 954 962 germline germline NN 963 973 expression expression NN 973 974 , , , 975 982 because because IN 983 985 it it PRP 986 988 is be VBZ 989 990 B B NNP 991 995 cell cell NN 996 1004 specific specific JJ 1004 1005 , , , 1006 1009 and and CC 1010 1012 is be VBZ 1013 1015 at at IN 1016 1019 the the DT 1020 1027 merging merging JJ 1028 1033 point point NN 1034 1036 of of IN 1037 1040 two two CD 1041 1051 signalling signalling NN 1052 1060 pathways pathway NNS 1061 1065 that that WDT 1066 1069 are be VBP 1070 1078 critical critical JJ 1079 1082 for for IN 1083 1086 IgE IgE NNP 1087 1096 switching switching NN 1096 1097 . . .