FMP Publications

Our publications are recorded in a searchable database since 2010, updates will be added regularly.

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References
X-exome sequencing of 405 unresolved families identifies seven novel intellectual disability genes
Hu(*), H., Haas(*), S. A., Chelly(*), J., Van Esch(*), H., Raynaud(*), M., de Brouwer(*), A. P., Weinert, S., Froyen(*), G., Frints(*), S. G., Laumonnier, F., Zemojtel(*), T., Love(*), M. I., Richard(*), H., Emde(*), A. K., Bienek(*), M., Jensen(*), C., Hambrock(*), M., Fischer(*), U., Langnick(*), C., Feldkamp(*), M., Wissink-Lindhout(*), W., Lebrun(*), N., Castelnau(*), L., Rucci(*), J., Montjean(*), R., Dorseuil(*), O., Billuart(*), P., Stuhlmann, T., Shaw(*), M., Corbett(*), M. A., Gardner(*), A., Willis-Owen(*), S., Tan(*), C., Friend(*), K. L., Belet(*), S., van Roozendaal(*), K. E., Jimenez-Pocquet(*), M., Moizard(*), M. P., Ronce(*), N., Sun(*), R., O'Keeffe(*), S., Chenna(*), R., van Bommel(*), A., Goke(*), J., Hackett(*), A., Field(*), M., Christie(*), L., Boyle(*), J., Haan(*), E., Nelson(*), J., Turner(*), G., Baynam(*), G., Gillessen-Kaesbach(*), G., Müller, U., Steinberger(*), D., Budny(*), B., Badura-Stronka(*), M., Latos-Bielenska(*), A., Ousager(*), L. B., Wieacker(*), P., Rodriguez Criado(*), G., Bondeson(*), M. L., Anneren(*), G., Dufke(*), A., Cohen(*), M., Van Maldergem(*), L., Vincent-Delorme(*), C., Echenne(*), B., Simon-Bouy(*), B., Kleefstra(*), T., Willemsen(*), M., Fryns(*), J. P., Devriendt(*), K., Ullmann(*), R., Vingron(*), M., Wrogemann(*), K., Wienker(*), T. F., Tzschach(*), A., van Bokhoven(*), H., Gecz(*), J., Jentsch, T. J., Chen(*), W., Ropers(*), H. H.; Kalscheuer(*), V. M.
Molecular psychiatry, 21:133-148
(2016)

Tags: Physiology and Pathology of Ion Transport (Jentsch

Abstract: X-linked intellectual disability (XLID) is a clinically and genetically heterogeneous disorder. During the past two decades in excess of 100 X-chromosome ID genes have been identified. Yet, a large number of families mapping to the X-chromosome remained unresolved suggesting that more XLID genes or loci are yet to be identified. Here, we have investigated 405 unresolved families with XLID. We employed massively parallel sequencing of all X-chromosome exons in the index males. The majority of these males were previously tested negative for copy number variations and for mutations in a subset of known XLID genes by Sanger sequencing. In total, 745 X-chromosomal genes were screened. After stringent filtering, a total of 1297 non-recurrent exonic variants remained for prioritization. Co-segregation analysis of potential clinically relevant changes revealed that 80 families (20%) carried pathogenic variants in established XLID genes. In 19 families, we detected likely causative protein truncating and missense variants in 7 novel and validated XLID genes (CLCN4, CNKSR2, FRMPD4, KLHL15, LAS1L, RLIM and USP27X) and potentially deleterious variants in 2 novel candidate XLID genes (CDK16 and TAF1). We show that the CLCN4 and CNKSR2 variants impair protein functions as indicated by electrophysiological studies and altered differentiation of cultured primary neurons from Clcn4(-/-) mice or after mRNA knock-down. The newly identified and candidate XLID proteins belong to pathways and networks with established roles in cognitive function and intellectual disability in particular. We suggest that systematic sequencing of all X-chromosomal genes in a cohort of patients with genetic evidence for X-chromosome locus involvement may resolve up to 58% of Fragile X-negative cases.

Structural rearrangement of the intracellular domains during AMPA receptor activation
Zachariassen(*), L. G., Katchan, L., Jensen(*), A. G., Pickering(*), D. S., Plested, A. J.; Kristensen(*), A. S.
Proc Natl Acad Sci U S A, 113:E3950-3959
(2016)

Tags: Molecular Neuroscience and Biophysics (Plested)

Abstract: alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs) are ligand-gated ion channels that mediate the majority of fast excitatory neurotransmission in the central nervous system. Despite recent advances in structural studies of AMPARs, information about the specific conformational changes that underlie receptor function is lacking. Here, we used single and dual insertion of GFP variants at various positions in AMPAR subunits to enable measurements of conformational changes using fluorescence resonance energy transfer (FRET) in live cells. We produced dual CFP/YFP-tagged GluA2 subunit constructs that had normal activity and displayed intrareceptor FRET. We used fluorescence lifetime imaging microscopy (FLIM) in live HEK293 cells to determine distinct steady-state FRET efficiencies in the presence of different ligands, suggesting a dynamic picture of the resting state. Patch-clamp fluorometry of the double- and single-insert constructs showed that both the intracellular C-terminal domain (CTD) and the loop region between the M1 and M2 helices move during activation and the CTD is detached from the membrane. Our time-resolved measurements revealed unexpectedly complex fluorescence changes within these intracellular domains, providing clues as to how posttranslational modifications and receptor function interact.

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Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP)
Campus Berlin-Buch
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13125 Berlin, Germany
+4930 94793 - 100 
+4930 94793 - 109 (Fax)
info(at)fmp-berlin.de

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