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BMC, Genome Biology, 12(12), p. 414

DOI: 10.1186/gb-2011-12-12-414

BMC, Genome Biology, 8(12), p. R81

DOI: 10.1186/gb-2011-12-8-r81

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Genome sequence of an Australian kangaroo, Macropus eugenii, provides insight into the evolution of mammalian reproduction and development

Journal article published in 2011 by Marilyn B. Renfree, Anthony T. Papenfuss ORCID, Janine E. Deakin, Willem Rens, Paul D. Waters, James Lindsay, Dav Wood, Elizabeth A. Pharo, Thomas Heider, Geoff Shaw ORCID, Katherine Belov, Emily Sw W. Wong ORCID, Kevin R. Nicholas, Matthew J. Wakefield ORCID, Christophe M. Lefevre and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Background. We present the genome sequence of the tammar wallaby, Macropus eugenii, which is a member of the kangaroo family and the first representative of the iconic hopping mammals that symbolize Australia to be sequenced. The tammar has many unusual biological characteristics, including the longest period of embryonic diapause of any mammal, extremely synchronized seasonal breeding and prolonged and sophisticated lactation within a well-defined pouch. Like other marsupials, it gives birth to highly altricial young, and has a small number of very large chromosomes, making it a valuable model for genomics, reproduction and development. Results. The genome has been sequenced to 2 ? coverage using Sanger sequencing, enhanced with additional next generation sequencing and the integration of extensive physical and linkage maps to build the genome assembly. We also sequenced the tammar transcriptome across many tissues and developmental time points. Our analyses of these data shed light on mammalian reproduction, development and genome evolution: there is innovation in reproductive and lactational genes, rapid evolution of germ cell genes, and incomplete, locus-specific X inactivation. We also observe novel retrotransposons and a highly rearranged major histocompatibility complex, with many class I genes located outside the complex. Novel microRNAs in the tammar HOX clusters uncover new potential mammalian HOX regulatory elements. Conclusions. Analyses of these resources enhance our understanding of marsupial gene evolution, identify marsupial-specific conserved non-coding elements and critical genes across a range of biological systems, including reproduction, development and immunity, and provide new insight into marsupial and mammalian biology and genome evolution.