TY - JOUR
T1 - Developmental and degenerative features in a complicated spastic paraplegia
AU - Manzini, M. Chiara
AU - Rajab, Anna
AU - Maynard, Thomas M.
AU - Mochida, Ganeshwaran H.
AU - Tan, Wen Hann
AU - Nasir, Ramzi
AU - Sean Hill, R.
AU - Gleason, Danielle
AU - Saffar, Muna Al
AU - Partlow, Jennifer N.
AU - Barry, Brenda J.
AU - Vernon, Mike
AU - LaMantia, Anthony Samuel
AU - Walsh, Christopher A.
PY - 2010/4
Y1 - 2010/4
N2 - Objective: We sought to explore the genetic and molecular causes of Troyer syndrome, one of several complicated hereditary spastic paraplegias (HSPs). Troyer syndrome had been thought to be restricted to the Amish; however, we identified 2 Omani families with HSP, short stature, dysarthria and developmental delay - core features of Troyer syndrome - and a novel mutation in the SPG20 gene, which is also mutated in the Amish. In addition, we analyzed SPG20 expression throughout development to infer how disruption of this gene might generate the constellation of developmental and degenerative Troyer syndrome phenotypes. Methods: Clinical characterization of 2 non-Amish families with Troyer syndrome was followed by linkage and sequencing analysis. Quantitative polymerase chain reaction and in situ hybridization analysis of SPG20 expression were carried out in embryonic and adult human and mouse tissue. Results: Two Omani families carrying a novel SPG20 mutation displayed clinical features remarkably similar to the Amish patients with Troyer syndrome. SPG20 mRNA is expressed broadly but at low relative levels in the adult brain; however, it is robustly and specifically expressed in the limbs, face, and brain during early morphogenesis. Interpretation: Null mutations in SPG20 cause Troyer syndrome, a specific clinical entity with developmental and degenerative features. Maximal expression of SPG20 in the limb buds and forebrain during embryogenesis may explain the developmental origin of the skeletal and cognitive defects observed in this disorder.
AB - Objective: We sought to explore the genetic and molecular causes of Troyer syndrome, one of several complicated hereditary spastic paraplegias (HSPs). Troyer syndrome had been thought to be restricted to the Amish; however, we identified 2 Omani families with HSP, short stature, dysarthria and developmental delay - core features of Troyer syndrome - and a novel mutation in the SPG20 gene, which is also mutated in the Amish. In addition, we analyzed SPG20 expression throughout development to infer how disruption of this gene might generate the constellation of developmental and degenerative Troyer syndrome phenotypes. Methods: Clinical characterization of 2 non-Amish families with Troyer syndrome was followed by linkage and sequencing analysis. Quantitative polymerase chain reaction and in situ hybridization analysis of SPG20 expression were carried out in embryonic and adult human and mouse tissue. Results: Two Omani families carrying a novel SPG20 mutation displayed clinical features remarkably similar to the Amish patients with Troyer syndrome. SPG20 mRNA is expressed broadly but at low relative levels in the adult brain; however, it is robustly and specifically expressed in the limbs, face, and brain during early morphogenesis. Interpretation: Null mutations in SPG20 cause Troyer syndrome, a specific clinical entity with developmental and degenerative features. Maximal expression of SPG20 in the limb buds and forebrain during embryogenesis may explain the developmental origin of the skeletal and cognitive defects observed in this disorder.
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U2 - 10.1002/ana.21923
DO - 10.1002/ana.21923
M3 - Article
C2 - 20437587
AN - SCOPUS:77951740940
SN - 0364-5134
VL - 67
SP - 516
EP - 525
JO - Annals of Neurology
JF - Annals of Neurology
IS - 4
ER -