Abstract
Mental retardation (MR) is a common cause of intellectual disability and affects approximately 2 to 3% of children and young adults. Many forms of MR are associated with abnormalities in dendritic structure and/or dendritic spine morphology. Given that dendritic spine morphology has been tightly linked to synaptic activity, altered spine morphology has been suggested to underlie or contribute to the cognitive disabilities associated with MR. The structure and dynamics of dendritic spines is determined by its underlying actin cytoskeleton. Signaling molecules and cascades important for cytoskeletal regulation have therefore attracted a great deal of attention. As key regulators of both the actin and microtubule cytoskeletons, it is not surprising that the Rho GTPases have emerged as important regulators of dendrite and spine structural plasticity. Significantly, mutations in regulators and effectors of Rho GTPases have been associated with diseases affecting the nervous system, including MR and amyotropic lateral sclerosis (ALS). Here, we will discuss Rho GTPase-related genes and their signaling pathways involved in MR and ALS.
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Abbreviations
- AD:
-
Alzheimer disease
- ALS:
-
amyotropic lateral sclerosis
- AMPAR:
-
α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor
- ARHGEF6:
-
Rho guanine–nucleotide exchange factor 6
- Arp2/3:
-
actin-related proteins 2 and 3
- Aβ:
-
amyloid β
- CREB:
-
cAMP-responsive element-binding protein
- CYFIP:
-
cytoplasmic FMR1 interacting protein
- FMRP:
-
fragile-X mental retardation protein
- FMR1:
-
fragile-X mental retardation-1 gene
- FRAXA:
-
fragile-X syndrome
- GAP:
-
GTPase activating proteins
- GDI:
-
guanine–nucleotide dissociation inhibitor
- GEF:
-
guanine–nucleotide exchange factor
- LIM:
-
Lin-11, Isl-1, and Mec-3 kinase
- LTD:
-
long-term depression
- LTP:
-
long-term potentiation
- MEGAP:
-
mental disorder-associated GAP protein
- mGluR:
-
metabotropic glutamate receptor
- MLC:
-
myosin light chain
- MLCK:
-
myosin light chain kinase
- MLCP:
-
myosin light chain phosphatase
- MR:
-
mental retardation
- MRX:
-
non-syndromic X-linked mental retardation
- MRXS:
-
syndromic X-linked mental retardation
- OPHN1:
-
oligophrenin-1
- PAK:
-
p21-activated kinases
- ROCK:
-
Rho-Kinase
- WASP:
-
Wiskott–Aldrich syndrome protein
- WAVE:
-
WASP family Verprolin-homologous protein
- WS:
-
Williams–Beuren syndrome
- XLMR:
-
X-linked mental retardation
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Acknowledgements
L.V.A is supported by the National Institutes of Health, National Science Foundation, and National Alliance for Autism Research. N.N.K is a postdoctoral fellow from the Fund for Scientific Research Flanders and is supported by the Human Frontiers Science Program.
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Nadif Kasri, N., Van Aelst, L. Rho-linked genes and neurological disorders. Pflugers Arch - Eur J Physiol 455, 787–797 (2008). https://doi.org/10.1007/s00424-007-0385-1
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DOI: https://doi.org/10.1007/s00424-007-0385-1