Abstract
Because the cerebellum emerged at the agnathan-gnathostome transition and cartilaginous fishes are at the base of the gnathostome lineage, this group is crucial to determine the basic developmental pattern of the cerebellum and to gain insights into its origin. We have systematically analyzed key events in the development of cerebellum and cerebellum-related structures of the shark Scyliorhinus canicula. Three developmental periods are distinguished based on anatomical observations combined with molecular analysis. We present neurochemical and genoarchitectonic evidence on the onset of cerebellar development, the rostral and caudal cerebellar boundaries, the compartmentalization of the cerebellum, and correspondence of cerebellar domains to rhombomeric segmentation of the rostral hindbrain. Our observations, mainly based on the expression pattern of ScHoxA2, support the origin of both the upper and lower auricular leaves from r1 and exclude any cerebellar origin from r2. Correlation between subrhombomeres r1a/r1b and cerebellar domains is proposed based on the ScEn2 expression. The ScEn2 and ScOtx2 expression patterns revealed an antero-posterior cerebellar compartmentalization similar to that of mammals, and supported certain fissures (commonly used to define cerebellar domains) as reliable anatomical landmarks. At difference from mammals, the expression of ScEn2 along the cerebellar median-lateral axis does not reveal a multiple-banded pattern. The present study provides an atlas of cerebellar development in one of the most basal extant gnathostome lineages and emphasizes the importance of combining classic descriptive with modern molecular studies to gain knowledge on the ancestral condition of cerebellar developmental processes and the origins and evolution of the cerebellum.
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Abbreviations
- AMV:
-
Anterior medullary velum
- Aur:
-
Auricles
- c:
-
Sulcus c
- Cb:
-
Cerebellum
- Cbcl:
-
Caudal lobe of cerebellum
- CbCr:
-
Cerebellar crest
- Cbdp:
-
Dorsal part of the cerebellar body
- Cbp:
-
Cerebellar plate
- Cbrl:
-
Rostral lobe of cerebellum
- Cbvp:
-
Ventral part of the cerebellar body
- ChP:
-
Choroid plexus
- CP:
-
Cerebellar peduncle
- CPp:
-
Cerebellar peduncle primordium
- Di:
-
Diencephalon
- DON:
-
Dorsal octaval nucleus
- e2:
-
Sulcus e2
- e2′:
-
Subcerebellar sulcus e2′
- FL:
-
Fibrous layer
- fmi:
-
Inferior median fissure
- GE:
-
Granular eminence
- GL:
-
Cerebellar granular layer
- IIIn:
-
Oculomotor nerve
- IS:
-
Isthmus
- Isfo:
-
Isthmic fovea
- IVv:
-
Fourth ventricle
- IVn:
-
Trochlear nerve
- IXn:
-
Glossopharyngeal nerve
- iz:
-
Intermediate zone
- LAL:
-
Lower auricular leaf
- Lf:
-
Longitudinal fissure
- LPost:
-
Lobulus posticus
- LR:
-
Lateral recess
- LRL:
-
Lower rhombic lip
- MedE:
-
Median eminence
- Mes:
-
Mesencephalon
- MHB:
-
Midbrain-hindbrain boundary
- MOL:
-
Cerebellar molecular layer
- MON:
-
Medial octaval nucleus
- Mrf:
-
Meso-rhombencephalic fissure
- Nlla:
-
Anterior lateral line nerve
- OLA:
-
Octavolateral area
- OT:
-
Optic tectum
- PL:
-
Purkinje cell layer
- plf:
-
Posterolateral fissure
- prf:
-
Primary transverse fissure
- Pros:
-
Prosencephalon
- r0-2:
-
Rhombomeres 0–2
- Ra:
-
Raphe
- Rh:
-
Rombencephalon
- sid:
-
Intermediate dorsal sulcus
- slH:
-
His sulcus or sulcus limitans
- sms:
-
Median superior sulcus
- UAL:
-
Upper auricular leaf
- UALp:
-
Upper auricular leaf primordium
- URL:
-
Upper rhombic lip
- vAP:
-
Ventral area of the alar plate
- VbCb:
-
Vestibulocerebellum
- VIIIm:
-
Magnocellular octaval nucleus
- VIIIn:
-
Octaval nerve
- VIIn:
-
Facial nerve
- Vn:
-
Trigeminal nerve
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Acknowledgments
We thank Prof. Dr. R. Anadón for the valuable comments made during the preparation of this paper and his critical reading of the manuscript. This work was supported by grants from the Spanish Dirección General de Investigación-FEDER (BFU2010- 15816), the Xunta de Galicia (10PXIB200051PR, CN 2012/237), and European Community-Research Infrastructure Action under the FP7 "Capacities" Specific Programme (ASSEMBLE 227799).
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429_2015_998_MOESM1_ESM.tif
Supplementary material 1 Transverse sections of the caudal hindbrain in Scyliorhinus canicula at late embryonic and juvenile stages, showing specific neurochemical features of the intermediate zone (indicated with the red dotted line) in between the lower auricular leaf and dorsal octaval nucleus. In this area, it was observed: granule cells with the hematoxylin–eosin staining (a), expression of ScHoxA2 (b), low density of 5-HT-ir fibers (c), and high density of CR-ir fibers (d). Scale bars 200 µm (c, d); 500 µm (a, b) (TIFF 2620 kb)
429_2015_998_MOESM2_ESM.tif
Supplementary material 2 Transverse section of the caudal hindbrain in Scyliorhinus canicula at stage 29, showing a reduction in the expression of proliferating cell nuclear marker (PCNA) in the zones where grooves are forming (indicated with arrowheads). Scale bar 300 µm (TIFF 366 kb)
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Pose-Méndez, S., Candal, E., Mazan, S. et al. Morphogenesis of the cerebellum and cerebellum-related structures in the shark Scyliorhinus canicula: insights on the ground pattern of the cerebellar ontogeny. Brain Struct Funct 221, 1691–1717 (2016). https://doi.org/10.1007/s00429-015-0998-7
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DOI: https://doi.org/10.1007/s00429-015-0998-7