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Complex Loci in human and mouse genomes.

Engstrom, Par and Suzuki, Harukazu and Ninomiya, Noriko and Akalin, Altuna and Sessa, Luca and Lavorgna, Giovanni and Brozzi, Alessandro and Luzi, Lucilla and Tan, Sin Lam and Yang, Liang and Kunarso, Galih and Ng, Edwin Lian-Chong and Batalov, Sergei and Wahlestedt, Claes and Kai, Chikatoshi and Kawai, Jun and Carninci, Piero and Hayashizaki, Yoshihide and Wells, Christine and Bajic, Vladimir and Orlando, Valerio and Reid, James and Lenhard, Boris and Lipovich, Leonard (2006) Complex Loci in human and mouse genomes. PLoS Genetics, 2 (4). e47. ISSN 1553-7404

Abstract

Mammalian genomes harbor a larger than expected number of complex loci, in which multiple genes are coupled by shared transcribed regions in antisense orientation and/or by bidirectional core promoters. To determine the incidence, functional significance, and evolutionary context of mammalian complex loci, we identified and characterized 5,248 cis-antisense pairs, 1,638 bidirectional promoters, and 1,153 chains of multiple cis-antisense and/or bidirectionally promoted pairs from 36,606 mouse transcriptional units (TUs), along with 6,141 cis-antisense pairs, 2,113 bidirectional promoters, and 1,480 chains from 42,887 human TUs. In both human and mouse, 25% of TUs resided in cis-antisense pairs, only 17% of which were conserved between the two organisms, indicating frequent species specificity of antisense gene arrangements. A sampling approach indicated that over 40% of all TUs might actually be in cis-antisense pairs, and that only a minority of these arrangements are likely to be conserved between human and mouse. Bidirectional promoters were characterized by variable transcriptional start sites and an identifiable midpoint at which overall sequence composition changed strand and the direction of transcriptional initiation switched. In microarray data covering a wide range of mouse tissues, genes in cis-antisense and bidirectionally promoted arrangement showed a higher probability of being coordinately expressed than random pairs of genes. In a case study on homeotic loci, we observed extensive transcription of nonconserved sequences on the noncoding strand, implying that the presence rather than the sequence of these transcripts is of functional importance. Complex loci are ubiquitous, host numerous nonconserved gene structures and lineage-specific exonification events, and may have a cis-regulatory impact on the member genes.

Item Type: Article
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Date Deposited: 13 Oct 2015 13:17
Last Modified: 13 Oct 2015 13:17
URI: https://oak.novartis.com/id/eprint/94

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