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Increased dosage of RAB39B affects neuronal development and could explain the cognitive impairment in male patients with distal Xq28 copy number gainsVanmarsenille, Lieselot ...Copy number gains at Xq28 are a frequent cause of X-linked intellectual disability (XLID). Here, we report on a recurrent 0.5 Mb tandem copy number gain at distal Xq28 not including MECP2, in four ... male patients with nonsyndromic mild ID and behavioral problems. The genomic region is duplicated in two families and triplicated in a third reflected by more distinctive clinical features. The X-inactivation patterns in carrier females correspond well with their clinical symptoms. Our mapping data confirm that this recurrent gain is likely mediated by nonallelic homologous recombination between two directly oriented Int22h repeats. The affected region harbors eight genes of which RAB39B encoding a small GTPase, was the prime candidate since loss-of-function mutations had been linked to ID. RAB39B is expressed at stable levels in lymphocytes from control individuals, suggesting a tight regulation. mRNA levels in our patients were almost two-fold increased. Overexpression of Rab39b in mouse primary hippocampal neurons demonstrated a significant decrease in neuronal branching as well as in the number of synapses when compared with the control neurons. Taken together, we provide evidence that the increased dosage of RAB39B causes a disturbed neuronal development leading to cognitive impairment in patients with this recurrent copy number gain.Source: Human mutation. - ISSN 1059-7794 (Vol. 35, iss. 3, Mar. 2014, str. 377-383)Type of material - article, component part ; adult, seriousPublish date - 2014Language - englishCOBISS.SI-ID - 31509465
Author
Vanmarsenille, Lieselot |
Giannandrea, Maila |
Fieremans, Nathalie |
Verbeeck, Jelle |
Belet, Stefanie |
Raynaud, Martine |
Vogels, Annick |
Männik, Katrin |
Õunap, Katrin |
D'Adamo, Patrizia
Topics
intellectual disability |
cognitive impairment |
RAB39B |
duševna prizadetost |
kognitivna okvara |
RAB39B
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Vanmarsenille, Lieselot | ![]() |
Giannandrea, Maila | ![]() |
Fieremans, Nathalie | ![]() |
Verbeeck, Jelle | ![]() |
Belet, Stefanie | ![]() |
Raynaud, Martine | ![]() |
Vogels, Annick | ![]() |
Männik, Katrin | ![]() |
Õunap, Katrin | ![]() |
D'Adamo, Patrizia | 33901 |
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