The complete genomic organization of the two mucin genes MUC2 and MUC6 was obtained by comparison of new and published mRNA sequences with newly available human genomic sequence. The two genes are located 38.5 kb apart in a head-to-head orientation within a gene complex on chromosome 11p15.5. The N-terminal organization of MUC6 is highly similar to that of MUC2, containing the D1, D2, D', and D3 Von Willebrand factor domains followed by the large tandem repeat domains located in exons 31 and 30, respectively. MUC6 has a much smaller C-terminal domain (101 amino acids) encoded by 2 exons containing only the CK domain, compared with MUC2, which has a C-terminal domain of 859 amino acids containing the D4, C, D, and CK domains, encoded by 19 exons. The gene structures agreed partially but not completely with predictions from gene prediction programs.
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