The G59S mutation in p150(glued) causes dysfunction of dynactin in mice.
The G59S missense mutation at the conserved microtubule-binding domain of p150(glued), a major component of dynein/dynactin complex, has been linked to an autosomal dominant form of motor neuron disease (MND). To study how this mutation affects the function of the dynein/dynactin complex and contributes to motor neuron degeneration, we generated p150(glued) G59S knock-in mice. We found that the G59S mutation destabilizes p150(glued) and disrupts the function of dynein/dynactin complex, resulting in early embryonic lethality of homozygous knock-in mice. Heterozygous knock-in mice, which developed normally, displayed MND-like phenotypes after 10 months of age, including excessive accumulation of cytoskeletal and synaptic vesicle proteins at neuromuscular junctions, loss of spinal motor neurons, increase of reactive astrogliosis, and shortening of gait compared with wild-type littermates and age-matched p150(glued) heterozygous knock-out mice. Our findings indicate that the G59S mutation in p150(glued) abrogates the normal function of p150(glued) and accelerates motor neuron degeneration.
Lai
Chen
C
Unit of Transgenesis, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, Maryland 20892, USA.
Lin
Xian
X
Chandran
Jayanth
J
Shim
Hoon
H
Yang
Wan-Jou
WJ
Cai
Huaibin
H
D000818:Animals; D000072159:Dynactin Complex; D005260:Female; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D008822:Mice, Transgenic; D008869:Microtubule-Associated Proteins / Q000235:genetics* / Q000502:physiology*; D016472:Motor Neuron Disease / Q000235:genetics* / Q000378:metabolism; D020125:Mutation, Missense; D011247:Pregnancy
C000606364:Dctn1 protein, mouse; D000072159:Dynactin Complex; D008869:Microtubule-Associated Proteins