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. 2013 Mar 26;11(3):e1001518. doi: 10.1371/journal.pbio.1001518

Figure 3. The germline mat locus contains six incomplete mating type gene pairs.

Figure 3

The locus is a 91-kb tandem array of six incomplete, head-to-head mating type gene pairs, in the order II, V, VI, IV, VII, and III (order established as shown in Figure 4). Each gene pair begins to the left with the MTA conserved TM exon (diagonal lines) and ends with the MTB conserved TM exon (dark gray). Only the terminal genes (MTA2 and MTB3) have full length versions of their TM exons. The mating type-specific, somatic-destined segment for each mating type gene pair, which includes the 5′ MTA and MTB segments and the intervening upstream spacer region (putative promoter), is shown as a single thick colored bar. Between the TM exon segments of adjacent gene pairs, there is a small amount of germline-limited sequence (GLS; black). Several IESs are located within the mating type-specific segments (also black). Excluding IES sequence, the mating type-specific segments are of comparable size: II, 8,673 bp; V, 9,132 bp; VI, 9,352 bp; IV, 8,450 bp; VII, 8,277 bp; and III, 8,384 bp. Exact coordinates of all these features are given in Table S4.