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Volume 17, Number 9,
Issue of May 1, 1997
pp. 3024-3037
Copyright ©1997 Society for Neuroscience
A Hierarchy of Hu RNA Binding Proteins in Developing and
Adult Neurons
Received Dec. 24, 1996; revised Feb. 3, 1997; accepted Feb. 11, 1997.
Hirotaka J. Okano and
Robert B. Darnell
Laboratory of Molecular Neuro-Oncology, The Rockefeller University,
New York, New York 10021
The Hu proteins are a group of antigens targeted in an
immune-mediated neurodegenerative disorder associated with cancer. We
have cloned and characterized four members of the Hu
gene family from mouse. We find that the Hu genes encode
a large number of alternatively spliced transcripts to produce a series
of related neuron-specific RNA binding proteins. Despite this
complexity, we have discerned several ordered features of
Hu expression. In the embryo, specific Hu
genes are expressed in a hierarchy during early neurogenesis. In the
E16 developing cortex, mHuB is induced in very early
postmitotic neurons exiting the ventricular zone, mHuD
is expressed in migrating neurons of the intermediate zone, and
mHuC is expressed in mature cortical plate neurons. Such
a hierarchy suggests distinct functional roles for each gene in developing neurons. In the adult, all neurons express some set of
Hu mRNA and protein. However, specific patterns are
evident such that individual neuronal types in the hippocampus,
cerebellum, olfactory cortex, neocortex, and elsewhere express from one
to several Hu genes. The complexity of potential protein
variants within a gene family and of different Hu family
members within a neuron suggests a diverse array of function. Given the
strong homologies among the Hu proteins, the Drosophila
neurogenic gene elav, and the Drosophila
splicing factor sxl, we predict that different
combinations of Hu proteins determine different neuron-specific aspects
of post-transcriptional RNA regulation. Our findings of specific
developmental patterns of expression and the correlation between immune
targeting of the Hu proteins and adult neurodegenerative disease
suggest that the Hu proteins are critical in both the proper
development and function of mature neurons.
Key words:
neuron-specific gene expression;
paraneoplastic
neurologic disease;
RNA binding protein;
Hu onconeural antigen;
autoimmunity
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