Nov 9, 2018

Chromosome-wide evolution and sex determination in a nematode with three sexes

BioRxiv : the Preprint Server for Biology
Sophie TandonnetAndre Pires da Silva

Abstract

The free-living nematode Auanema rhodensis is a rare example of a species with three sexes, in which males, females and hermaphrodites coexist. A. rhodensis males have only one X chromosome (XO), whereas females and hermaphrodites have two (XX). The A. rhodensis X chromosome is unusual: it does not recombine in hermaphrodites and is transmitted from father to son. The mechanism that controls the production of females versus hermaphrodites is unknown but is dependent on maternal and larval environmental factors. Here we report the genome sequence and genetic map of A. rhodensis, placing over 95% of the sequence in seven linkage groups. Comparison of the seven A. rhodensis chromosomes to chromosomal assemblies of Caenorhabditis elegans and three other rhabditine nematodes identified deeply conserved linkage groups we call Nigon units, some of which have been maintained in all species analysed. Others have undergone breakage and fusion, and the A. rhodensis karyotype is the product of a unique set of rearrangements involving three Nigon units. The A. rhodensis X chromosome is much smaller than the autosomes, is less gene dense and is 3 to 4 times more polymorphic, reflecting its unique transmission history. Differential expression...Continue Reading

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Mentioned in this Paper

Calcinus elegans
Cyartonema elegans
Gene Polymorphism
Coleonyx elegans
AN 1
Cestrum elegans
Clarkia unguiculata
Clathrulina elegans
Campanula rhodensis
Cardioglossa elegans

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