Rose K

References (3)

Title : Novel mutations in NLGN3 causing autism spectrum disorder and cognitive impairment - Quartier_2019_Hum.Mutat_40_2021
Author(s) : Quartier A , Courraud J , Thi Ha T , McGillivray G , Isidor B , Rose K , Drouot N , Savidan MA , Feger C , Jagline H , Chelly J , Shaw M , Laumonnier F , Gecz J , Mandel JL , Piton A
Ref : Hum Mutat , 40 :2021 , 2019
Abstract : The X-linked NLGN3 gene, encoding a postsynaptic cell adhesion molecule, was involved in a nonsyndromic monogenic form of autism spectrum disorder (ASD) by the description of one unique missense variant, p.Arg451Cys (Jamain et al. 2003). We investigated here the pathogenicity of additional missense variants identified in two multiplex families with intellectual disability (ID) and ASD: c.1789C>T, p.Arg597Trp, previously reported by our group (Redin et al. 2014) and present in three affected cousins and c.1540C>T, p.Pro514Ser, identified in two affected brothers. Overexpression experiments in HEK293 and HeLa cell lines revealed that both variants affect the level of the mature NLGN3 protein, its localization at the plasma membrane and its presence as a cleaved form in the extracellular environment, even more drastically than what was reported for the initial p.Arg451Cys mutation. The variants also induced an unfolded protein response, probably due to the retention of immature NLGN3 proteins in the endoplasmic reticulum. In comparison, the c.1894A>G, p.Ala632Thr and c.1022T>C, p.Val341Ala variants, present in males from the general population, have no effect. Our report of two missense variants affecting the normal localization of NLGN3 in a total of five affected individuals reinforces the involvement of the NLGN3 gene in a neurodevelopmental disorder characterized by ID and ASD.
ESTHER : Quartier_2019_Hum.Mutat_40_2021
PubMedSearch : Quartier_2019_Hum.Mutat_40_2021
PubMedID: 31184401
Gene_locus related to this paper: human-NLGN3

Title : Neuromuscular junction abnormalities in DNM2-related centronuclear myopathy - Gibbs_2013_J.Mol.Med.(Berl)_91_727
Author(s) : Gibbs EM , Clarke NF , Rose K , Oates EC , Webster R , Feldman EL , Dowling JJ
Ref : J Mol Med (Berl) , 91 :727 , 2013
Abstract : Dynamin-2-related centronuclear myopathy (DNM2-CNM) is a clinically heterogeneous muscle disorder characterized by muscle weakness and centralized nuclei on biopsy. There is little known about the muscle dysfunction underlying this disorder, and there are currently no treatments. In this study, we establish a novel zebrafish model for DNM2-CNM by transiently overexpressing a mutant version of DNM2 (DNM2-S619L) during development. We show that overexpression of DNM2-S619L leads to pathological changes in muscle and a severe motor phenotype. We further demonstrate that the muscle weakness seen in these animals can be significantly alleviated by treatment with an acetylcholinesterase inhibitor. Based on these results, we reviewed the clinical history of five patients with two different DNM2-CNM mutations (S619L and E368K) and found electrophysiological evidence of abnormal neuromuscular transmission in two of the individuals. All five patients showed improved muscle strength and motor function, and/or reduced fatigability following acetylcholinesterase inhibitor treatment. Together, our results suggest that deficits at the neuromuscular junction may play an important role in the pathogenesis of DNM2-CNM and that treatments targeting this dysfunction can provide an effective therapy for patients with this disorder.
ESTHER : Gibbs_2013_J.Mol.Med.(Berl)_91_727
PubMedSearch : Gibbs_2013_J.Mol.Med.(Berl)_91_727
PubMedID: 23338057

Title : A new monocupin quercetinase of Streptomyces sp. FLA: identification and heterologous expression of the queD gene and activity of the recombinant enzyme towards different flavonols - Merkens_2007_Arch.Microbiol_187_475
Author(s) : Merkens H , Sielker S , Rose K , Fetzner S
Ref : Arch Microbiol , 187 :475 , 2007
Abstract : The gene queD encoding quercetinase of Streptomyces sp. FLA, a soil isolate related to S. eurythermus (T), was identified. Quercetinases catalyze the 2,4-dioxygenolytic cleavage of 3,5,7,3',4'-pentahydroxyflavone to 2-protocatechuoylphloroglucinol carboxylic acid and carbon monoxide. The queD gene was expressed in S. lividans and E. coli, and the recombinant hexahistidine-tagged protein (QueDHis(6)) was purified. Several flavonols were converted by QueDHis(6), whereas CO formation from the 2,3-dihydroflavonol taxifolin and the flavone luteolin were not observed. In contrast to bicupin quercetinases from Aspergillus japonicus and Bacillus subtilis, and bicupin pirins showing quercetinase activity, QueD of strain FLA is a monocupin exhibiting 35.9% sequence identity to the C-terminal domain of B. subtilis quercetinase. Its native molecular mass of 63 kDa suggests a multimeric protein. A queD-specific probe hybridized with fragments of genomic DNA of four other quercetin degrading Streptomyces strains, but not with DNA of B. subtilis. Potential ORFs upstream of queD probably code for a serine protease and an endoribonuclease; two ORFs downstream of queD may encode an amidohydrolase and a carboxylesterase. This arrangement suggests that queD is not part of a catabolic gene cluster. Quercetinases might play a major role as detoxifying rather than catabolic enzymes.
ESTHER : Merkens_2007_Arch.Microbiol_187_475
PubMedSearch : Merkens_2007_Arch.Microbiol_187_475
PubMedID: 17516049