Browsing by Author "Zaki, Maha S."

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    Biallelic loss of human CTNNA2, encoding alpha N-catenin, leads to ARP2/3 complex overactivity and disordered cortical neuronal migration
    (NATURE PUBLISHING GROUP, 2018-01-01) Schaffer, Ashleigh E.; Breuss, Martin W.; Caglayan, Ahmet Okay; Al-Sanaa, Nouriya; Al-Abdulwahed, Hind Y.; Kaymakcalan, Hande; Yilmaz, Cahide; Zaki, Maha S.; Rosti, Rasim O.; Copeland, Brett; Baek, Seung Tae; Musaev, Damir; Scott, Eric C.; Ben-Omran, Tawfeg; Kariminejad, Ariana; Kayserili, Hulya; Mojahedi, Faezeh; Kara, Majdi; Cai, Na; Silhavy, Jennifer L.; Elsharif, Seham; Fenercioglu, Elif; Barshop, Bruce A.; Kara, Bulent; Wang, Rengang; Stanley, Valentina; James, Kiely N.; Nachnani, Rahul; Kalur, Aneesha; Megahed, Hisham; Incecik, Faruk; Danda, Sumita; Alanay, Yasemin; Faqeih, Eissa; Melikishvili, Gia; Mansour, Lobna; Miller, Ian; Sukhudyan, Biayna; Chelly, Jamel; Dobyns, William B.; Bilguvar, Kaya; Abou Jamra, Rami; Gunel, Murat; Gleeson, Joseph G.
    Neuronal migration defects, including pachygyria, are among the most severe developmental brain defects in humans. Here, we identify biallelic truncating mutations in CTNNA2, encoding alpha N-catenin, in patients with a distinct recessive form of pachygyria. CTNNA2 was expressed in human cerebral cortex, and its loss in neurons led to defects in neurite stability and migration. The alpha N-catenin paralog, alpha E-catenin, acts as a switch regulating the balance between beta-catenin and Arp2/3 actin filament activities(1). Loss of alpha N-catenin did not affect beta-catenin signaling, but recombinant alpha N-catenin interacted with purified actin and repressed ARP2/3 actin-branching activity. The actin-binding domain of alpha N-catenin or ARP2/3 inhibitors rescued the neuronal phenotype associated with CTNNA2 loss, suggesting ARP2/3 de-repression as a potential disease mechanism. Our findings identify CTNNA2 as the first catenin family member with biallelic mutations in humans, causing a new pachygyria syndrome linked to actin regulation, and uncover a key factor involved in ARP2/3 repression in neurons.
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    Defining the clinical, molecular and imaging spectrum of adaptor protein complex 4-associated hereditary spastic paraplegia
    (OXFORD UNIV PRESS, 2020-01-01) Ebrahimi-Fakhari, Darius; Teinert, Julian; Behne, Robert; Wimmer, Miriam; D'Amore, Angelica; Eberhardt, Kathrin; Brechmann, Barbara; Ziegler, Marvin; Jensen, Dana M.; Nagabhyrava, Premsai; Geisel, Gregory; Carmody, Erin; Shamshad, Uzma; Dies, Kira A.; Yuskaitis, Christopher J.; Salussolia, Catherine L.; Ebrahimi-Fakhari, Daniel; Pearson, Toni S.; Saffari, Afshin; Ziegler, Andreas; Koelker, Stefan; Volkmann, Jens; Wiesener, Antje; Bearden, David R.; Lakhani, Shenela; Segal, Devorah; Udwadia-Hegde, Anaita; Martinuzzi, Andrea; Hirst, Jennifer; Perlman, Seth; Takiyama, Yoshihisa; Xiromerisiou, Georgia; Vill, Katharina; Walker, William O.; Shukla, Anju; Gupta, Rachana Dubey; Dahl, Niklas; Aksoy, Ayse; Verhelst, Helene; Delgado, Mauricio R.; Pourova, Radka Kremlikova; Sadek, Abdelrahim A.; Elkhateeb, Nour M.; Blumkin, Lubov; Brea-Fernandez, Alejandro J.; Dacruz-Alvarez, David; Smol, Thomas; Ghoumid, Jamal; Miguel, Diego; Heine, Constanze; Schlump, Jan-Ulrich; Langen, Hendrik; Baets, Jonathan; Bulk, Saskia; Darvish, Hossein; Bakhtiari, Somayeh; Kruer, Michael C.; Lim-Melia, Elizabeth; Aydinli, Nur; Alanay, Yasemin; El-Rashidy, Omnia; Nampoothiri, Sheela; Patel, Chirag; Beetz, Christian; Bauer, Peter; Yoon, Grace; Guillot, Mireille; Miller, Steven P.; Bourinaris, Thomas; Houlden, Henry; Robelin, Laura; Anheim, Mathieu; Alamri, Abdullah S.; Mahmoud, Adel A. H.; Inaloo, Soroor; Habibzadeh, Parham; Faghihi, Mohammad Ali; Jansen, Anna C.; Brock, Stefanie; Roubertie, Agathe; Darras, Basil T.; Agrawal, Pankaj B.; Santorelli, Filippo M.; Gleeson, Joseph; Zaki, Maha S.; Sheikh I, Sarah; Bennett, James T.; Sahin, Mustafa
    Bi-allelic loss-of-function variants in genes that encode subunits of the adaptor protein complex 4 (AP-4) lead to prototypical yet poorly understood forms of childhood-onset and complex hereditary spastic paraplegia: SPG47 (AP4B1), SPG50 (AP4M1), SPG51 (AP4E1) and SPG52 (AP4S1). Here, we report a detailed cross-sectional analysis of clinical, imaging and molecular data of 156 patients from 101 families. Enrolled patients were of diverse ethnic backgrounds and covered a wide age range (1.0-49.3 years). While the mean age at symptom onset was 0.8 +/- 0.6 years {[}standard deviation (SD), range 0.2-5.0], the mean age at diagnosis was 10.2 +/- 8.5 years (SD, range 0.1-46.3). We define a set of core features: early-onset developmental delay with delayed motor milestones and significant speech delay (50\% non-verbal)