Chromosome map of sense-antisense transcript and nonantisense bidirectional transcription pairs. All of the mapped positions of the bidirectional transcription pairs are schematically presented. The sense-antisense transcript and nonantisense bidirectional transcription pairs are presented in green on the left and in blue on the right, respectively. The red lines indicate the positions of the known imprinted genes. The pink areas are the regions ± 5 Mb of the known imprinted gene positions. Note that there are a few mapped positions of the sense-antisense transcripts on the X chromosome, compared with the autosomes. The names of known imprinted genes mapped in each pink region are: Wt1 (1); Nnat (2); Gnas, Gnasxl, Nespas (3); p73 (4); Sgce (5); Copg2, Mit1/Ib9 (6); Peg3/Pw1, Usp29, Zim1, Zim3, Zfp264 (7); Frat3, GABRA5, GABRB3, GABRG3, Magel2, Mkrn3/Zfp127, Ndn, Snrpn, Snurf, Ube3a (8); H19, Igf2, Igf2as, Ins2, Ipl/Tssc3, Kvlqt1, Mash2, Nap1l4, Obph1, p57KIP2/Cdkn1c, Slc22a1l, Tapa1/Cd81, Tssc4 (9); Rasgrf1 (10); Zac1 (11); Dcn (12); Meg1/Grb10 (13); U2af1-rs1 region1, U2af1-rs1 region2 (14); Dlk, Meg3/Gtl2 (15); Htr2a (16); Ata3 (17); Igf2r, Mas1, Slc22a2, Slc22a3 (18); Impact (19); Ins1 (20). Because the genes on the X chromosome are imprinted only on the paternal X chromosome in the extraembryonic tissues (reviewed by Latham 1996), we did not shade the X chromosome with pink color. Although the chromosomal locations of Ipw, Kvlqt1-as, Msuit, Peg1/Mest, and Pwcr1 are already known, these genes were not computationally mapped by BLAST program. Accordingly, these genes are not shown in Figure 3.
