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Start Over Author "Mehrabian, Shima" Topic alzheimer's disease
10 results on '"Mehrabian, Shima"'

1. Rare Pathogenic Variants in Pooled Whole-Exome Sequencing Data Suggest Hyperammonemia as a Possible Cause of Dementia Not Classified as Alzheimer's Disease or Frontotemporal Dementia.

Author

Karachanak-Yankova, Sena, Serbezov, Dimitar, Antov, Georgi, Stancheva, Mikaela, Mihaylova, Marta, Hadjidekova, Savina, Toncheva, Draga, Pashov, Anastas, Belejanska, Diyana, Zhelev, Yavor, Petrova, Mariya, Mehrabian, Shima, and Traykov, Latchezar

Subjects
ALZHEIMER'S disease, FRONTOTEMPORAL dementia, HETEROZYGOSITY, DEMENTIA, HYPERAMMONEMIA, ENZYME deficiency
Abstract

The genetic bases of Alzheimer's disease (AD) and frontotemporal dementia (FTD) have been comprehensively studied, which is not the case for atypical cases not classified into these diagnoses. In the present study, we aim to contribute to the molecular understanding of the development of non-AD and non-FTD dementia due to hyperammonemia caused by mutations in urea cycle genes. The analysis was performed by pooled whole-exome sequencing (WES) of 90 patients and by searching for rare pathogenic variants in autosomal genes for enzymes or transporters of the urea cycle pathway. The survey returned two rare pathogenic coding mutations leading to citrullinemia type I: rs148918985, p.Arg265Cys, C>T; and rs121908641, p.Gly390Arg, G>A in the argininosuccinate synthase 1 (ASS1) gene. The p.Arg265Cys variant leads to enzyme deficiency, whereas p.Gly390Arg renders the enzyme inactive. These variants found in simple or compound heterozygosity can lead to the late-onset form of citrullinemia type I, associated with high ammonia levels, which can lead to cerebral dysfunction and thus to the development of dementia. The presence of urea cycle disorder-causing mutations can be used for the early initiation of antihyperammonemia therapy in order to prevent the neurotoxic effects. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Author Correction: Common variants in Alzheimer’s disease and risk stratification by polygenic risk scores

Author

de Rojas, Itziar, Moreno-Grau, Sonia, Tesi, Niccolo, Grenier-Boley, Benjamin, Andrade, Victor, Jansen, Iris E., Pedersen, Nancy L., Stringa, Najada, Zettergren, Anna, Hernández, Isabel, Antúnez, Carmen, Antonell, Anna, Tankard, Rick M., Bis, Joshua C., Sims, Rebecca, Bellenguez, Céline, Quintela, Inés, González-Perez, Antonio, Calero, Miguel, Macías, Juan, Blesa, Rafael, Cervera-Carles, Laura, Menéndez-González, Manuel, Royo, Jose Luís, Moreno, Fermin, Huerto Vilas, Raquel, Baquero, Miquel, Diez-Fairen, Mónica, Lage, Carmen, García-González, Pablo, Valero, Sergi, Ullgren, Abbe, Naj, Adam C., Lemstra, Afina W., Benussi, Alberto, Rábano, Alberto, Padovani, Alessandro, Squassina, Alessio, de Mendonça, Alexandre, Arias Pastor, Alfonso, Kok, Almar A. L., Meggy, Alun, Pastor, Ana Belén, Espinosa, Ana, Corma-Gómez, Anaïs, Sanabria, Ángela, DeStefano, Anita L., Schneider, Anja, Haapasalo, Annakaisa, Kinhult Ståhlbom, Anne, Tybjærg-Hansen, Anne, Hartmann, Annette M., Spottke, Annika, Corbatón-Anchuelo, Arturo, Rongve, Arvid, Borroni, Barbara, Arosio, Beatrice, Nacmias, Benedetta, Nordestgaard, Børge G., Kunkle, Brian W., Charbonnier, Camille, Masullo, Carlo, Martínez Rodríguez, Carmen, Muñoz-Fernandez, Carmen, Dufouil, Carole, Graff, Caroline, Ferreira, Catarina B., Chillotti, Caterina, Reynolds, Chandra A., Fenoglio, Chiara, Van Broeckhoven, Christine, Clark, Christopher, Pisanu, Claudia, Satizabal, Claudia L., Holmes, Clive, Buiza-Rueda, Dolores, Aarsland, Dag, Rujescu, Dan, Alcolea, Daniel, Galimberti, Daniela, Wallon, David, Seripa, Davide, Grünblatt, Edna, Dardiotis, Efthimios, Düzel, Emrah, Scarpini, Elio, Conti, Elisa, Rubino, Elisa, Gelpi, Ellen, Rodriguez-Rodriguez, Eloy, Duron, Emmanuelle, Boerwinkle, Eric, Ferri, Evelyn, Tagliavini, Fabrizio, Küçükali, Fahri, Pasquier, Florence, Sanchez-Garcia, Florentino, Mangialasche, Francesca, Jessen, Frank, Nicolas, Gaël, Selbæk, Geir, Ortega, Gemma, Chêne, Geneviève, Hadjigeorgiou, Georgios, Rossi, Giacomina, Spalletta, Gianfranco, Giaccone, Giorgio, Grande, Giulia, Binetti, Giuliano, Papenberg, Goran, Hampel, Harald, Bailly, Henri, Zetterberg, Henrik, Soininen, Hilkka, Karlsson, Ida K., Alvarez, Ignacio, Appollonio, Ildebrando, Giegling, Ina, Skoog, Ingmar, Saltvedt, Ingvild, Rainero, Innocenzo, Rosas Allende, Irene, Hort, Jakub, Diehl-Schmid, Janine, Van Dongen, Jasper, Vidal, Jean-Sebastien, Lehtisalo, Jenni, Wiltfang, Jens, Thomassen, Jesper Qvist, Kornhuber, Johannes, Haines, Jonathan L., Vogelgsang, Jonathan, Pineda, Juan A., Fortea, Juan, Popp, Julius, Deckert, Jürgen, Buerger, Katharina, Morgan, Kevin, Fließbach, Klaus, Sleegers, Kristel, Molina-Porcel, Laura, Kilander, Lena, Weinhold, Leonie, Farrer, Lindsay A., Wang, Li-San, Kleineidam, Luca, Farotti, Lucia, Parnetti, Lucilla, Tremolizzo, Lucio, Hausner, Lucrezia, Benussi, Luisa, Froelich, Lutz, Ikram, M. Arfan, Deniz-Naranjo, M. Candida, Tsolaki, Magda, Rosende-Roca, Maitée, Löwenmark, Malin, Hulsman, Marc, Spallazzi, Marco, Pericak-Vance, Margaret A., Esiri, Margaret, Bernal Sánchez-Arjona, María, Dalmasso, Maria Carolina, Martínez-Larrad, María Teresa, Arcaro, Marina, Nöthen, Markus M., Fernández-Fuertes, Marta, Dichgans, Martin, Ingelsson, Martin, Herrmann, Martin J., Scherer, Martin, Vyhnalek, Martin, Kosmidis, Mary H., Yannakoulia, Mary, Schmid, Matthias, Ewers, Michael, Heneka, Michael T., Wagner, Michael, Scamosci, Michela, Kivipelto, Miia, Hiltunen, Mikko, Zulaica, Miren, Alegret, Montserrat, Fornage, Myriam, Roberto, Natalia, van Schoor, Natasja M., Seidu, Nazib M., Banaj, Nerisa, Armstrong, Nicola J., Scarmeas, Nikolaos, Scherbaum, Norbert, Goldhardt, Oliver, Hanon, Oliver, Peters, Oliver, Skrobot, Olivia Anna, Quenez, Olivier, Lerch, Ondrej, Bossù, Paola, Caffarra, Paolo, Dionigi Rossi, Paolo, Sakka, Paraskevi, Mecocci, Patrizia, Hoffmann, Per, Holmans, Peter A., Fischer, Peter, Riederer, Peter, Yang, Qiong, Marshall, Rachel, Kalaria, Rajesh N., Mayeux, Richard, Vandenberghe, Rik, Cecchetti, Roberta, Ghidoni, Roberta, Frikke-Schmidt, Ruth, Sorbi, Sandro, Hägg, Sara, Engelborghs, Sebastiaan, Helisalmi, Seppo, Botne Sando, Sigrid, Kern, Silke, Archetti, Silvana, Boschi, Silvia, Fostinelli, Silvia, Gil, Silvia, Mendoza, Silvia, Mead, Simon, Ciccone, Simona, Djurovic, Srdjan, Heilmann-Heimbach, Stefanie, Riedel-Heller, Steffi, Kuulasmaa, Teemu, del Ser, Teodoro, Lebouvier, Thibaud, Polak, Thomas, Ngandu, Tiia, Grimmer, Timo, Bessi, Valentina, Escott-Price, Valentina, Giedraitis, Vilmantas, Deramecourt, Vincent, Maier, Wolfgang, Jian, Xueqiu, Pijnenburg, Yolande A. L., Smith, A. David, Saenz, Aldo, Bizzarro, Alessandra, Lauria, Alessandra, Vacca, Alessandro, Solomon, Alina, Anastasiou, Anna, Richardson, Anna, Boland, Anne, Koivisto, Anne, Daniele, Antonio, Greco, Antonio, Marianthi, Arnaoutoglou, McGuinness, Bernadette, Fin, Bertrand, Ferrari, Camilla, Custodero, Carlo, Ferrarese, Carlo, Ingino, Carlos, Mangone, Carlos, Reyes Toso, Carlos, Martínez, Carmen, Cuesta, Carolina, Muchnik, Carolina, Joachim, Catharine, Ortiz, Cecilia, Besse, Céline, Johansson, Charlotte, Zoia, Chiara Paola, Laske, Christoph, Anastasiou, Costas, Palacio, Dana Lis, Politis, Daniel G., Janowitz, Daniel, Craig, David, Mann, David M., Neary, David, Jürgen, Deckert, Daian, Delphine, Belezhanska, Diyana, Kohler, Eduardo, Castaño, Eduardo M., Koutsouraki, Effrosyni, Chipi, Elena, De Roeck, Ellen, Costantini, Emanuele, Vardy, Emma R. L. C., Piras, Fabrizio, Roveta, Fausto, Piras, Federica, Prestia, Federico Ariel, Assogna, Francesca, Salani, Francesca, Sala, Gessica, Lacidogna, Giordano, Novack, Gisela, Wilcock, Gordon, Thonberg, Håkan, Kölsch, Heike, Weber, Heike, Boecker, Henning, Etchepareborda, Ignacio, Piaceri, Irene, Tuomilehto, Jaakko, Lindström, Jaana, Laczo, Jan, Johnston, Janet, Deleuze, Jean-François, Harris, Jenny, Schott, Jonathan M., Priller, Josef, Bacha, Juan Ignacio, Snowden, Julie, Lisso, Julieta, Mihova, Kalina Yonkova, Traykov, Latchezar, Morelli, Laura, Brusco, Luis Ignacio, Rainer, Malik, Takalo, Mari, Bjerke, Maria, Del Zompo, Maria, Serpente, Maria, Sanchez Abalos, Mariana, Rios, Mario, Peltonen, Markku, Herrman, Martin J., Kohler, Matias, Rojo, Matias, Jones, Matthew, Orsini, Michela, Medel, Nancy, Olivar, Natividad, Fox, Nick C., Salvadori, Nicola, Hooper, Nigel M., Galeano, Pablo, Solis, Patricia, Bastiani, Patrizia, Passmore, Peter, Heun, Reinhard, Antikainen, Riitta, Olaso, Robert, Perneczky, Robert, Germani, Sandra, López-García, Sara, Love, Seth, Mehrabian, Shima, Bagnoli, Silvia, Kochen, Silvia, Andreoni, Simona, Teipel, Stefan, Todd, Stephen, Pickering-Brown, Stuart, Natunen, Teemu, Tegos, Thomas, Laatikainen, Tiina, Strandberg, Timo, Polvikoski, Tuomo M., Matoska, Vaclav, Ciullo, Valentina, Cores, Valeria, Solfrizzi, Vincenzo, Lisetti, Viviana, Sevillano, Zulma, Abdelnour, C., Aguilera, N., Alarcon, E., Alegret, M., Benaque, A., Boada, M., Buendia, M., Cañabate, P., Carracedo, A., de Rojas, I., Diego, S., Espinosa, A., Gailhajenet, A., García-González, P., Gil, S., Guitart, M., González-Pérez, A., Hernández, I., Ibarria, M., Lafuente, A., Macias, J., Maroñas, O., Martín, E., Martínez, M.T., Marquié, M., Mauleón, A., Montrreal, L., Moreno-Grau, S., Moreno, M., Orellana, A., Ortega, G., Pancho, A., Pelejá, E., Pérez-Cordon, A., Pineda, J.A., Preckler, S., Quintela, I., Real, L.M., Rosende-Roca, M., Ruiz, A., Sáez, M.E., Sanabria, A., Serrano-Rios, M., Sotolongo-Grau, O., Tárraga, L., Valero, S., Vargas, L., Adarmes-Gómez, A.D., Alarcón-Martín, E., Alonso, M.D., Álvarez, I., Álvarez, V., Amer-Ferrer, G., Antequera, M., Antúnez, C., Baquero, M., Bernal, M., Blesa, R., Bullido, M.J., Burguera, J.A., Calero, M., Carrillo, F., Carrión-Claro, M., Casajeros, M.J., Clarimón, J., Cruz-Gamero, J.M., de Pancorbo, M.M., del Ser, T., Diez-Fairen, M., Escuela, R., Garrote-Espina, L., Fortea, J., Franco-Macías, E., Frank-García, A., Garcia Madrona, S., Gómez-Garre, P., Hevilla, S., Jesús, S., Labrador Espinosa, M.A., Lage, C., Legaz, A., Lleó, A., Lopez de Munain, A., López-García, S., Macias-García, D., Manzanares, S., Marín, M., Marín-Muñoz, J., Marín, T., Martín Montes, A., Martínez, B., Martínez, C., Martínez, V., Martínez-Lage Álvarez, P., Medina, M., Mendioroz Iriarte, M., Menéndez-González, M., Mir, P., Molinuevo, J.L., Pastor, P., Pérez Tur, J., Periñán-Tocino, T., Pineda-Sanchez, R., Piñol-Ripoll, G., Rábano, A., Real de Asúa, D., Rodrigo, S., Rodríguez-Rodríguez, E., Royo, J.L., Sanchez del Valle Díaz, R., Sánchez-Juan, P., Sastre, I., Vicente, M.P., Vigo-Ortega, R., Vivancos, L., Macleod, C., McCracken, C., Brayne, Carol, Bresner, Catherine, Grozeva, Detelina, Bellou, Eftychia, Sommerville, Ewen W., Matthews, F., Leonenko, Ganna, Menzies, Georgina, Windle, Gill, Harwood, Janet, Phillips, Judith, Bennett, K., Luckuck, Lauren, Clare, Linda, Woods, Robert, Saad, Salha, Burholt, Vanessa, Kehoe, Patrick Gavin, Garcia-Ribas, Guillermo, Sánchez-Juan, Pascual, Pastor, Pau, Pérez-Tur, Jordi, Piñol-Ripoll, Gerard, Lopez de Munain, Adolfo, García-Alberca, Jose María, Bullido, María J., Álvarez, Victoria, Lleó, Alberto, Real, Luis M., Mir, Pablo, Medina, Miguel, Scheltens, Philip, Holstege, Henne, Marquié, Marta, Sáez, María Eugenia, Carracedo, Ángel, Amouyel, Philippe, Schellenberg, Gerard D., Williams, Julie, Seshadri, Sudha, van Duijn, Cornelia M., Mather, Karen A., Sánchez-Valle, Raquel, Serrano-Ríos, Manuel, Orellana, Adelina, Tárraga, Lluís, Blennow, Kaj, Huisman, Martijn, Andreassen, Ole A., Posthuma, Danielle, Clarimón, Jordi, Boada, Mercè, van der Flier, Wiesje M., Ramirez, Alfredo, Lambert, Jean-Charles, van der Lee, Sven J., Ruiz, Agustín, Smith, A David, Saenz, Aldo, Bizzarro, Alessandra, Lauria, Alessandra, Vacca, Alessandro, Solomon, Alina, Anastasiou, Anna, Richardson, Anna, Boland, Anne, Koivisto, Anne, Daniele, Antonio, Greco, Antonio, Marianthi, Arnaoutoglou, McGuinness, Bernadette, Fin, Bertrand, Ferrari, Camilla, Custodero, Carlo, Ferrarese, Carlo, Ingino, Carlos, Mangone, Carlos, Reyes Toso, Carlos, Martínez, Carmen, Cuesta, Carolina, Muchnik, Carolina, Joachim, Catharine, Ortiz, Cecilia, Besse, Céline, Johansson, Charlotte, Zoia, Chiara Paola, Laske, Christoph, Anastasiou, Costas, Palacio, Dana Lis, Politis, Daniel G, Janowitz, Daniel, Craig, David, Mann, David M, Neary, David, Jürgen, Deckert, Daian, Delphine, Belezhanska, Diyana, Kohler, Eduardo, Castaño, Eduardo M, Koutsouraki, Effrosyni, Chipi, Elena, De Roeck, Ellen, Costantini, Emanuele, Vardy, Emma R L C, Piras, Fabrizio, Roveta, Fausto, Piras, Federica, Prestia, Federico Ariel, Assogna, Francesca, Salani, Francesca, Sala, Gessica, Lacidogna, Giordano, Novack, Gisela, Wilcock, Gordon, Thonberg, Håkan, Kölsch, Heike, Weber, Heike, Boecker, Henning, Etchepareborda, Ignacio, Piaceri, Irene, Tuomilehto, Jaakko, Lindström, Jaana, Laczo, Jan, Johnston, Janet, Deleuze, Jean-François, Harris, Jenny, Schott, Jonathan M, Priller, Josef, Bacha, Juan Ignacio, Snowden, Julie, Lisso, Julieta, Mihova, Kalina Yonkova, Traykov, Latchezar, Morelli, Laura, Brusco, Luis Ignacio, Rainer, Malik, Takalo, Mari, Bjerke, Maria, Del Zompo, Maria, Serpente, Maria, Sanchez Abalos, Mariana, Rios, Mario, Peltonen, Markku, Herrman, Martin J, Kohler, Matias, Rojo, Matias, Jones, Matthew, Orsini, Michela, Medel, Nancy, Olivar, Natividad, Fox, Nick C, Salvadori, Nicola, Hooper, Nigel M, Galeano, Pablo, Solis, Patricia, Bastiani, Patrizia, Passmore, Peter, Heun, Reinhard, Antikainen, Riitta, Olaso, Robert, Perneczky, Robert, Germani, Sandra, López-García, Sara, Love, Seth, Mehrabian, Shima, Bagnoli, Silvia, Kochen, Silvia, Andreoni, Simona, Teipel, Stefan, Todd, Stephen, Pickering-Brown, Stuart, Natunen, Teemu, Tegos, Thomas, Laatikainen, Tiina, Strandberg, Timo, Polvikoski, Tuomo M, Matoska, Vaclav, Ciullo, Valentina, Cores, Valeria, Solfrizzi, Vincenzo, Lisetti, Viviana, Sevillano, Zulma, Abdelnour, C., Aguilera, N., Alarcon, E., Alegret, M., Benaque, A., Boada, M., Buendia, M., Cañabate, P., Carracedo, A., Corbatón-Anchuelo, A., de Rojas, I., Diego, S., Espinosa, A., Gailhajenet, A., García-González, P., Gil, S., Guitart, M., González-Pérez, A., Hernández, I., Ibarria, M., Lafuente, A., Macias, J., Maroñas, O., Martín, E., Martínez, M. T., Marquié, M., Mauleón, A., Montrreal, L., Moreno-Grau, S., Moreno, M., Orellana, A., Ortega, G., Pancho, A., Pelejá, E., Pérez-Cordon, A., Pineda, J. A., Preckler, S., Quintela, I., Real, L. M., Rosende-Roca, M., Ruiz, A., Sáez, M. E., Sanabria, A., Serrano-Rios, M., Sotolongo-Grau, O., Tárraga, L., Valero, S., Vargas, L., Adarmes-Gómez, A. D., Alarcón-Martín, E., Alonso, M. D., Álvarez, I., Álvarez, V., Amer-Ferrer, G., Antequera, M., Antúnez, C., Baquero, M., Bernal, M., Blesa, R., Buiza-Rueda, D., Bullido, M. J., Burguera, J. A., Calero, M., Carrillo, F., Carrión-Claro, M., Casajeros, M. J., Clarimón, J., Cruz-Gamero, J. M., de Pancorbo, M. M., Del Ser, T., Diez-Fairen, M., Escuela, R., Garrote-Espina, L., Fortea, J., Franco-Macías, E., Frank-García, A., García-Alberca, J. M., Garcia Madrona, S., Garcia-Ribas, G., Gómez-Garre, P., Hevilla, S., Jesús, S., Labrador Espinosa, M. A., Lage, C., Legaz, A., Lleó, A., Lopez de Munain, A., López-García, S., Macias-García, D., Manzanares, S., Marín, M., Marín-Muñoz, J., Marín, T., Martín Montes, A., Martínez, B., Martínez, C., Martínez, V., Martínez-Lage Álvarez, P., Medina, M., Mendioroz Iriarte, M., Menéndez-González, M., Mir, P., Molinuevo, J. L., Pastor, P., Pérez Tur, J., Periñán-Tocino, T., Pineda-Sanchez, R., Piñol-Ripoll, G., Rábano, A., Real de Asúa, D., Rodrigo, S., Rodríguez-Rodríguez, E., Royo, J. L., Sanchez Del Valle Díaz, R., Sánchez-Juan, P., Sastre, I., Vicente, M. P., Vigo-Ortega, R., Vivancos, L., Macleod, C., McCracken, C., Brayne, Carol, Bresner, Catherine, Grozeva, Detelina, Bellou, Eftychia, Sommerville, Ewen W, Matthews, F., Leonenko, Ganna, Menzies, Georgina, Windle, Gill, Harwood, Janet, Phillips, Judith, Bennett, K., Luckuck, Lauren, Clare, Linda, Woods, Robert, Saad, Salha, Burholt, Vanessa, Rongve, Arvid, Brussels Heritage Lab, Clinical sciences, Neuroprotection & Neuromodulation, and Neurology

Subjects
polygenic risk scores, Multidisciplinary, Common variants, Neuroscience(all), neurology, Medizin, General Physics and Astronomy, ddc:500, General Chemistry, Alzheimer's disease, General Biochemistry, Genetics and Molecular Biology, RISK STRATIFICATION
Abstract

The original version of this Article omitted from the author list the 212th author Patrizia Mecocci, who is from the Institute of Gerontology and Geriatrics, Department of Medicine, University of Perugia, Perugia, Italy. Consequently, the “Sample Contribution” section of Author Contributions was updated to add “P.M” between “P.D.” and “R.C.”. Additionally, the original version of this Article contained the incorrect affiliation for author Patrick Gavin Kehoe, which incorrectly read “German Center for Neurodegenerative Diseases (DZNE), Berlin, Germany”. The correct version replaces this affiliation with “Bristol Medical School (THS), University of Bristol, Southmead Hospital, Bristol, UK”. This has been corrected in both the PDF and HTML versions of the Article. CA extern

Published
2023
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3. Detection of pathogenic variants in Alzheimer's disease related genes in Bulgarian patients by pooled whole-exome sequencing.

Author

Karachanak-Yankova, Sena, Serbezov, Dimitar, Mihaylova, Marta, Nikolova, Dragomira, Balabanski, Lubomir, Damyanova, Vera, Antonova, Olga, Staneva, Rada, Ganev, Mihail, Spasova, Victoria, Rukova, Blaga, Nesheva, Desislava, Josifovska, Slavica, Stancheva, Mikaela, Belejanska, Diana, Petrova, Mariya, Mehrabian, Shima, Traykov, Latchezar, Hadjidekova, Savina, and Toncheva, Draga

Subjects
ALZHEIMER'S disease, DISEASE risk factors
Abstract

In an effort to better understand the complex genetic background of Alzheimer's disease (AD) we performed high-coverage whole-exome sequencing of a DNA pool assembled of 66 Bulgarian AD patients. We focused our analysis on genes demonstrated to have association with AD in previous studies, i.e. PSEN1, PSEN2, APP, APOE, TREM2, HFE, CLU and CR1. In these genes, we established six pathogenic/likely pathogenic variants in the sequenced pool, three common and three rare. Two of these variants showed statically non-significant difference between Bulgarian AD patients and Bulgarian control exomes, the hemochromatosis variant rs104894002 (HFE) and rs7412 (APOE), which, notwithstanding its pathogenicity score, has putative protective role against AD. Three of the remaining four pathogenic/likely pathogenic variants were estimated to significantly differ in frequency between the analyzed AD patient pool and controls. These are the rs429358 (APOE) polymorphism, a well-established risk factor for Alzheimer's disease, the rs28936380 (PSEN2) and rs104894002 (TREM2), also ascertained to be associated with AD. The performed study validates the role of three pathogenic/likely pathogenic variants in AD related genes in the multifaceted genetic etiology of Alzheimer's disease. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Neurosyphilis with dementia and bilateral hippocampal atrophy on brain magnetic resonance imaging

Author

Mehrabian Shima, Raycheva Margarita, Traykova Martina, Stankova Tonya, Penev Latchezar, Grigorova Olga, and Traykov Latchezar

Subjects
Neurosyphilis, Dementia, Hippocampal atrophy, Alzheimer’s disease, Magnetic resonance imaging (MRI), Neurology. Diseases of the nervous system, RC346-429
Abstract

Abstract Background This article reports a rare case of active neurosyphilis in a man with mild to moderate dementia and marked hippocampal atrophy, mimicking early onset Alzheimer’s disease. Few cases have so far described bilateral hippocampal atrophy mimicking Alzheimer’s disease in neurosyphilis. Case presentation The patient presented here is a 33 year old Bulgarian male, whose clinical features include progressive cognitive decline and behavioral changes over the last 18 months. Neuropsychological examination revealed mild to moderate dementia (Mini Mental State Examination score was 16/30) with impaired memory and attention, and executive dysfunction. Pyramidal, and extrapyramidal signs, as well as dysarthria and impairment in coordination, were documented. Brain magnetic resonance imaging showed cortical atrophy with noticeable bilateral hippocampal atrophy. The diagnosis of active neurosyphilis was based on positive results of the Venereal Disease Research Laboratory test/Treponema pallidum hemagglutination reactions in blood and cerebrospinal fluid samples. In addition, cerebrospinal fluid analysis showed pleocytosis and elevated protein levels. High-dose intravenous penicillin therapy was administered. At 6 month follow up, improvements were noted clinically, on neuropsychological examinations, and in cerebrospinal fluid samples. Conclusion This case underlines the importance of early diagnosis of neurosyphilis. The results suggest that neurosyphilis should be considered when magnetic resonance imaging results indicate mesiotemporal abnormalities and hippocampal atrophy. Neurosyphilis is a treatable condition which requires early aggressive antibiotic therapy.

Published
2012
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5. Rare genetic variants prioritize molecular pathways for semaphorin interactions in Alzheimer's disease patients.

Author

Balabanski, Lubomir, Serbezov, Dimitar, Atanasoska, Maya, Karachanak-Yankova, Sena, Hadjidekova, Savina, Nikolova, Dragomira, Boyanova, Olga, Staneva, Rada, Vazharova, Radoslava, Mihailova, Marta, Damyanova, Vera, Nesheva, Desislava, Belejanska, Diana, Mehrabian, Shima, Traykov, Lachezar, and Toncheva, Draga

Subjects
ALZHEIMER'S patients, EXOMES, GENETIC variation, SEMAPHORINS, ALZHEIMER'S disease, FRONTOTEMPORAL dementia, BEACONS
Abstract

Contemporary genetic methods have not yet solved the 'missing heritability' problem of complex diseases such as Alzheimer's disease (AD). The impact of rare or less common variation on human complex diseases and traits remains to date barely investigated. In this study rare population variants detected using whole-exome sequencing were employed to examine how molecular pathways are prioritized in four groups: Alzheimer's disease (AD) patients, Frontotemporal dementia (FTD) patients, young and healthy individuals and centenarians. The set of prioritized genes in AD patients associated with Semaphorin interactions pathways, contrasting with the results of the other groups. We identified rare pathogenic, likely pathogenic and variants of unknown significance in these prioritized genes in AD patients. The results of this study offer evidence that semaphorin pathways play a role in AD genetic etiology. [ABSTRACT FROM AUTHOR]

Published
2021
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6. Phenotypic variability and neuropsychological findings associated with C9orf72 repeat expansions in a Bulgarian dementia cohort.

Author

Mehrabian, Shima, Thonberg, Håkan, Raycheva, Margarita, Lilius, Lena, Stoyanova, Katya, Forsell, Charlotte, Cavallin, Lena, Nesheva, Desislava, Westman, Eric, Toncheva, Draga, Traykov, Latchezar, Winblad, Bengt, and Graff, Caroline

Subjects
*FRONTOTEMPORAL dementia, *AMYOTROPHIC lateral sclerosis, *POLYMERASE chain reaction, *PHENOTYPES, *BRAIN imaging
Abstract

Background: The repeat expansion in the C9orf72 gene was recently identified as a major cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) in several European populations. The objective of this study was to determine the frequency of C9orf72 repeat expansions in a Bulgarian dementia cohort and to delineate the associated clinical features. Methods and findings: PCR-based assessments of the C9orf72 hexanucleotide repeat expansion in all study samples (including 82 FTD, 37 Alzheimer’s disease (AD), and 16 other neurodegenerative/dementia disorder cases) were performed. We report the clinical, neuropsychological, and neuroimaging findings obtained for the C9orf72 repeat expansion carriers. Of the 135 cases screened, 3/82 (3.7%) of all FTD cases and 1/37 (2.7%) of all clinical AD cases had a C9orf72 repeat expansion. In this cohort, the C9orf72 pathological expansion was found in clinical diagnoses bridging the FTD, parkinsonism, ALS and AD spectrum. Interestingly, we showed early writing errors without aphasia in two subjects with C9orf72 expansions. Conclusions: This study represents the first genetic screening for C9orf72 repeat expansions in a Bulgarian dementia cohort. The C9orf72 repeat expansion does not appear to be a common cause of FTD and related disorders. This report confirms the notion that C9orf72 repeat expansions underlie a broad spectrum of neurodegenerative phenotypes. Relatively isolated agraphia in two cases with C9orf72 repeat expansions is a strong motivation to provide detailed and sophisticated oral and written language assessments that can be used to more precisely characterize early cognitive deficits in these heterogeneous conditions. [ABSTRACT FROM AUTHOR]

Published
2018
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7. Cerebrospinal fluid biomarkers for Alzheimer's disease: the role of apolipoprotein E genotype, age, and sex.

Author

Mehrabian, Shima, Alexopoulos, Panagiotis, Ortner, Marion, Traykov, Latchezar, Grimmer, Timo, Kurz, Alexander, Förstl, Hans, Bickel, Horst, and Diehl-Schmid, Janine

Subjects
*CEREBROSPINAL fluid, *ALZHEIMER'S disease diagnosis, *BIOMARKERS, *APOLIPOPROTEIN E gene, *GENOTYPES
Abstract

Introduction: Cerebrospinal fluid (CSF) biomarkers improve the diagnostic accuracy for Alzheimer's disease (AD), even at the predementia stage of the disease. The ε4-allele of apolipoprotein E (ApoE ε4), female sex, and older age are well-known risk factors for AD. It is unclear how these risk factors affect the CSF biomarkers in patients with AD. Aim: The objective of this study was to investigate the associations of ApoE ε4, sex, and age with CSF biomarker levels in a unicenter sample of patients with AD that includes a high proportion of patients with early-onset AD (EOAD). Methods: The CSF levels of amyloid-β 1-42 (Aâ1-42) and total-tau of 117 subjects with mild to moderate AD (55 late-onset AD and 62 EOAD) were assessed. All subjects underwent ApoE genotyping, clinical evaluation, comprehensive neuropsychological assessments, and neuroimaging. Associations between CSF biomarker levels, ApoE ε4 allele frequency, age, and sex were evaluated. Results: In the whole patient sample and in the late-onset AD subgroup ε4 homozygous subjects had significantly lower CSF Aβ1-42 levels compared with ε4 heterozygous subjects and ε4 noncarriers. This association was not detected in the EOAD group. Age group, sex, and severity of cognitive decline did not have a significant impact on CSF Aβ1-42 levels. No significant associations were found between ApoE ε4 allele frequency and CSF total-tau levels. Conclusion: ApoE ε4 allele is associated with a reduction of CSF Aβ1-42 levels. This result is consistent with the findings of several previous studies. In the subgroup of patients with EOAD this association was not replicated. Larger studies are necessary to further investigate associations between ApoE ε4 allele frequency and CSF biomarker levels in patients with EOAD. [ABSTRACT FROM AUTHOR]

Published
2015
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8. Relationship between orthostatic hypotension and cognitive impairment in the elderly

Author

Mehrabian, Shima, Duron, Emmanuelle, Labouree, Florian, Rollot, Florence, Bune, Alex, Traykov, Latchezar, and Hanon, Olivier

Subjects
*ORTHOSTATIC hypotension, *COGNITION disorders, *OLDER patients, *BLOOD pressure measurement, *NEUROPSYCHOLOGICAL tests, *ALZHEIMER'S disease, *VASCULAR dementia, *LONGITUDINAL method
Abstract

Abstract: Background and purpose: To determine the relationship between orthostatic hypotension (OH) and cognitive function in elderly subjects with memory complaints. Methods: We studied the association between cognitive function and OH in 495 consecutive elderly outpatients attending a memory centre. Blood pressure (BP) was measured in a sitting and standing position. We examined cognitive function using a validated comprehensive battery of neuropsychological tests, the cognitive efficiency profile (CEP) assessing the main cognitive areas. Subjects were classified into 4 categories according to their cognitive status: normal cognitive function, mild cognitive impairment (MCI), Alzheimer''s disease (AD) or vascular dementia (VaD). Results: In this population, 76±8years of age (women 72%), 18% had normal cognitive function, 28% had MCI, 47% AD, and 7% VaD. Hypertension was observed in 74% of patients. OH was present in 14% of subjects (n=69). After adjustment for age, education level, systolic BP, diastolic BP, weight, and antihypertensive drugs, subjects with OH had worse cognitive function than those without OH (CEP score 50±24 vs 56±22, p<0.05). Moreover, a significant relationship was observed between OH and cognitive status (normal cognitive function, MCI, AD, or VaD). OH was present in 22% in VaD subjects, 15% in AD subjects, 12% in MCI subjects and 4% in normal control subjects (p<0.01 for overall test). Conclusion: Our results showed an association between OH and cognitive impairment and emphasize the need for longitudinal studies designed to evaluate the nature of the relationship between OH and cognitive decline. [Copyright &y& Elsevier]

Published
2010
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9. Effects of Antihypertensive Therapy on Cognitive Decline in Alzheimer's Disease.

Author

Duron, Emmanuelle, Rigaud, Anne-Sophie, Dubail, Delphine, Mehrabian, Shima, Latour, Florence, Seux, Marie-Laure, and Hanon, Olivier

Subjects
ANTIHYPERTENSIVE agents, CARDIOVASCULAR agents, ALZHEIMER'S disease, PRESENILE dementia, COGNITIVE ability, BLOOD pressure
Abstract

BackgroundTherapeutic trials concerning the effect of antihypertensive therapy on cognition have produced controversial findings. Our objective was to evaluate the impact of antihypertensive therapy on the cognitive function in subjects already diagnosed with Alzheimer's disease (AD).MethodsWe conducted an observational study in a memory clinic assessing outpatients suffering from AD. A total of 321 patients were included. Cognitive function was assessed yearly by the Mini-Mental State Examination (MMSE; score/30).ResultsThe mean age of patients was 78.1 ± 6 years, 54% of them received antihypertensive therapy and the mean MMSE scores were similar in both groups (patients taking antihypertensive therapy and patient without antihypertensive therapy). The mean follow-up was 34.1 ± 6 months. MMSE means were significantly higher among patients using antihypertensive therapy compared to those without antihypertensive therapy (MMSE scores = 21.9 ± 4.9 vs. 21.2 ± 5.1 at 1 year (P = 0.001); 20.8 ± 5.5 vs. 19.4 ± 5.7 at 2 years (P < 0.001); 19.0 ± 6.7 vs. 17.5 ± 6.4 at 3 years (P < 0.001)), after adjustment for age, gender, education level, systolic blood pressure (SBP), and diastolic blood pressure (DBP) at baseline, MMSE at baseline, coronary heart disease, statins, and antiplatelet agents' consumption. Furthermore, the use of antihypertensive therapy was associated with a lower estimated risk of cognitive decline (as defined by a decrease of at least one point in MMSE score over time) (hazard ratio = 0.61; 95% confidence interval = 0.45–0.81) after adjustment for the same factors.ConclusionsThese results suggest an association between antihypertensive therapy, a lower decrease in mean MMSE and a lower cognitive decline over time in AD.American Journal of Hypertension 2009; doi:10.1038/ajh.2009.119American Journal of Hypertension 2009; 22, 9, 1020–1024. doi:10.1038/ajh.2009.119 [ABSTRACT FROM AUTHOR]

Published
2009
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10. Apolipoprotein E ε4 allele frequency in elderly depressed patients with and without cerebrovascular disease

Author

Traykov, Latchezar, Bayle, Anne Catherine, Latour, Florence, Lenoir, Hermine, Seux, Marie-Laure, Hanon, Olivier, Péquignot, Renaud, Bert, Pierre, Moulin, Florence, Cantegreil, Inge, Wenisch, Emilie, Batouche, Fériel, Mehrabian, Shima, Rotrou, Jocelyne de, and Rigaud, Anne-Sophie

Subjects
*APOLIPOPROTEIN E, *PATIENTS, *BRAIN diseases, *CEREBROVASCULAR disease
Abstract

Abstract: Late-onset depression (LOD) could be a very early manifestation of Alzheimer''s disease (AD), although contradictory results have been reported. Cerebrovascular disease (CVD) may favor the development of LOD, and that the particular forms of vascular depression should be individualized. The Apolipoprotein E (ApoE) ε4 allele was shown to be a risk factor for AD. Its role in LOD is controversial, while it is still unknown in vascular depression. Our objective was to clarify the relationship between ApoE ε4 allele and LOD in patients with and without CVD. We examined the ApoE phenotypes in a sample of 311 subjects: 50 with vascular LOD, 24 with LOD without CVD, 115 with AD and 122 normal controls (NC). The study of the ApoE ε4 allele frequency showed significant differences between: AD group and the vascular LOD and NC groups; LOD group without CVD compared with NC group (p <0.05 to 0.001). The frequency of the ε4 allele in the LOD group without CVD did not differ significantly from the AD group, similarly the frequency of the ε4 allele in the vascular LOD group was not different from that in NC. The study suggests an association between the ApoE ε4 allele and the LOD without CVD. These patients could be at risk of developing AD by an ε4-dependent pathway. In contrast, the results show no association between the presence of ApoE ε4 allele and vascular depression and provide further evidence in support of the concept that ApoE ε4 allele is not associated with clinical CVD. [Copyright &y& Elsevier]

Published
2007
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