Tube‐like structures within the ovarian follicle of Hydrolagus colliei indicate the early origins of follicle cell processes
Abstract
Follicle cell processes (FCP) are actin‐based, tube‐like structures that connect the developing oocyte to the follicle cells throughout oogenesis. They were first described in Selachians (sharks) where their suggested roles were facilitating the transport of metabolites to the developing oocyte and providing structural support to the large egg cells of sharks, an early stage in the evolution of viviparity. Subsequent studies found that FCP are absent in Rajiformes (skates), suggesting that FCP may have been novel structures specific to the sharks. Here, FCP in Hydrolagus colliei, a Chimaeriform, were described. The FCP of H. colliei differ morphologically from those previously described in sharks, but as they also contain actin, they presumably play similar roles provisioning the developing oocyte and providing structural support. The presence of FCP in the order Chimaeriformes suggests that their origin predates the split of the elasmobranchs and the holocephalans.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 29, 2020
- Source ID
- 10.1111/jfb.14423
Entities
People
- Enrique L. Harold
- Henry Bart Jr
- Ian R Davenport
- Lydia Crawford
- Thomas M Huckaba
Organizations
- Office of Naval Research
- Tulane University of Louisiana
- Xavier University of Louisiana