Corticospinal neuron subpopulation-specific developmental genes prospectively indicate mature segmentally specific axon projection targeting.
Cell Rep
; 37(3): 109843, 2021 10 19.
Article
em En
| MEDLINE
| ID: mdl-34686320
ABSTRACT
For precise motor control, distinct subpopulations of corticospinal neurons (CSN) must extend axons to distinct spinal segments, from proximal targets in the brainstem and cervical cord to distal targets in thoracic and lumbar spinal segments. We find that developing CSN subpopulations exhibit striking axon targeting specificity in spinal white matter, which establishes the foundation for durable specificity of adult corticospinal circuitry. Employing developmental retrograde and anterograde labeling, and their distinct neocortical locations, we purified developing CSN subpopulations using fluorescence-activated cell sorting to identify genes differentially expressed between bulbar-cervical and thoracolumbar-projecting CSN subpopulations at critical developmental times. These segmentally distinct CSN subpopulations are molecularly distinct from the earliest stages of axon extension, enabling prospective identification even before eventual axon targeting decisions are evident in the spinal cord. This molecular delineation extends beyond simple spatial separation of these subpopulations in the cortex. Together, these results identify candidate molecular controls over segmentally specific corticospinal axon projection targeting.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tratos Piramidais
/
Axônios
/
Regulação da Expressão Gênica no Desenvolvimento
/
Substância Branca
/
Córtex Sensório-Motor
/
Crescimento Neuronal
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Cell Rep
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Estados Unidos