Expression of Hox genes during regeneration of nereid polychaete Alitta (Nereis) virens (Annelida, Lophotrochozoa)

EvoDevo

Milana A Kulakova¹  Alexander Y Nesterenko¹  Nadezhda I Bakalenko¹  Elena L Novikova¹ 

[1] Department of Embryology, Laboratory of Experimental Embryology, Saint-Petersburg State University, Oranienbaumskoe sh., 2, Petergof, Saint Petersburg, Russia

关键词: Lophotrochozoa;    Polychaetes;    Positional information;    Hox genes;    ncRNA;    Regeneration;   

Others  :  806704
DOI  :  10.1186/2041-9139-4-14

 received in 2012-11-29, accepted in 2013-02-05,  发布年份 2013

【 摘 要 】

Background

Hox genes are the key determinants of different morphogenetic events in all bilaterian animals. These genes are probably responsible for the maintenance of regenerative capacities by providing positional information in the regenerating animal body. Polychaetes are well known for their ability to regenerate the posterior as well as the anterior part of the body. We have recently described the expression of 10 out of 11 Hox genes during postlarval growth of Alitta (Nereis) virens. Hox genes form gradient overlapping expression patterns, which probably do not contribute to the morphological diversity of segments along the anterior-posterior axis of the homonomously segmented worm. We suggest that this gradient expression of Hox genes establishes positional information along the body that can be used to maintain coordinated growth and regeneration.

Results

We showed that most of the Hox gene expression patterns are reorganized in the central nervous system, segmental ectoderm and mesoderm. The reorganization takes place long before regeneration becomes apparent. The most rapid reorganization was observed for the genes with the largest differences in expression levels in the amputation site and the terminal structures (pygidium and growth zone). Moreover, we revealed the expression of two antisense Hox RNAs (Nvi-antiHox5 and Nvi-antiHox7) demonstrating unique expression patterns during regeneration.

Conclusions

Hox genes probably participate in the maintenance and restoration of the positional information in A. virens. During postlarval growth and regeneration, Hox genes do not alter the diversity of segments but provide the positional information along the anterior-posterior axis. The reorganization of at least some Hox gene patterns during regeneration may be regulated by their anti-sense transcripts, providing a rapid response of Hox gene transcripts to positional failure. The capacity of Hox genes to maintain the positional information in the adult body is present in different bilaterian animals (planarias, polychaetes and mammals) and might be an ancestral function inherited from the common evolutionary remote ancestor.

【 授权许可】

   
2013 Novikova et al.; licensee BioMed Central Ltd.

【 图 表 】

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