Zhong Yi Sun1, Josselin Houenou1, Delphine Duclap1, Samuel Sarrazin1, Julia Linke1, Claire Daban1, Nora Hamdani1, Marc-Antoine d'Albis1, Philippe Le Corvoisier1, Pamela Guevara1, Marine Delavest1, Frank Bellivier1, Frank Bellivier1, Jorge Almeida1, Amelia Versace1, Cyril Poupon1, Marion Leboyer1, Mary Phillips1, Michèle Wessa1, Jean-François Mangin1. 1. From the UNATI, Neurospin, I2BM, CEA Saclay, Gif-Sur-Yvette, France (Sun, Mangin); the UNIACT, Psychiatry Team, Neurospin, I2BM, CEA Saclay, Gif-Sur-Yvette, France (Houenou, Sarrazin); INSERM, U955, IMRB, Equipe 15 Psychiatrie Translationnelle, Créteil F-94000, France (Houenou, Sarrazin, Hamdani, d'Albis, Leboyer); the Fondation Fondamental, Créteil F-94010, France (Houenou, Sarrazin, Hamdani, d'Albis, Delavest, Bellivier, Leboyer); the AP-HP, Hôpitaux Universitaires Mondor, Pôle de Psychiatrie, DHU PePsy, Université Paris Est, Créteil F-94000, France (Sarrazin, Daban, Hamdani, d'Albis, Leboyer); the UNIRS, Neurospin, I2BM, CEA Saclay, Gif-Sur-Yvette, France (Duclap, Poupon); the Department of Clinical Psychology and Neuropsychology, Johannes Gutenberg University, Mainz, Germany (Linke, Wessa); INSERM, Centre d'Investigation Clinique 1430 and APHP, GH Henri Mondor, Créteil F-94000, France (Le Corvoisier); the University of Concepción, Concepción, Chile (Guevara); the AP-HP, Groupe Saint-Louis, Lariboisière-Fernand Widal, Pôle Neurosciences, Paris, France (Delavest, Bellivier); the Department of Psychiatry, Western Psychiatric Institute and Clinic, University of Pittsburgh School of Medecine, Pittsburgh, PA, USA (Almeida, Versace, Phillips); the Faculté de médecine, Universite Paris Est, Créteil, France (Leboyer); and the CATI Multicenter Neuroimaging Platform, France (Sun, Poupon, Mangin).
Abstract
BACKGROUND: Abnormal maturation of brain connectivity is supposed to underlie the dysfunctional emotion regulation in patients with bipolar disorder (BD). To test this hypothesis, white matter integrity is usually investigated using measures of water diffusivity provided by MRI. Here we consider a more intuitive aspect of the morphometry of the white matter tracts: the shape of the fibre bundles, which is associated with neurodevelopment. We analyzed the shape of 3 tracts involved in BD: the cingulum (CG), uncinate fasciculus (UF) and arcuate fasciculus (AF). METHODS: We analyzed diffusion MRI data in patients with BD and healthy controls. The fibre bundles were reconstructed using Q-ball-based tractography and automated segmentation. Using Isomap, a manifold learning method, the differences in the shape of the reconstructed bundles were visualized and quantified. RESULTS: We included 112 patients and 82 controls in our analysis. We found the left AF of patients to be further extended toward the temporal pole, forming a tighter hook than in controls. We found no significant difference in terms of shape for the left UF, the left CG or the 3 right fasciculi. However, in patients compared with controls, the ventrolateral branch of the left UF in the orbitofrontal region had a tendency to be larger, and the left CG of patients had a tendency to be smaller in the frontal lobe and larger in the parietal lobe. LIMITATIONS: This was a cross-sectional study. CONCLUSION: Our results suggest neurodevelopmental abnormalities in the left AF in patients with BD. The statistical tendencies observed for the left UF and left CG deserve further study.
BACKGROUND: Abnormal maturation of brain connectivity is supposed to underlie the dysfunctional emotion regulation in patients with bipolar disorder (BD). To test this hypothesis, white matter integrity is usually investigated using measures of water diffusivity provided by MRI. Here we consider a more intuitive aspect of the morphometry of the white matter tracts: the shape of the fibre bundles, which is associated with neurodevelopment. We analyzed the shape of 3 tracts involved in BD: the cingulum (CG), uncinate fasciculus (UF) and arcuate fasciculus (AF). METHODS: We analyzed diffusion MRI data in patients with BD and healthy controls. The fibre bundles were reconstructed using Q-ball-based tractography and automated segmentation. Using Isomap, a manifold learning method, the differences in the shape of the reconstructed bundles were visualized and quantified. RESULTS: We included 112 patients and 82 controls in our analysis. We found the left AF of patients to be further extended toward the temporal pole, forming a tighter hook than in controls. We found no significant difference in terms of shape for the left UF, the left CG or the 3 right fasciculi. However, in patients compared with controls, the ventrolateral branch of the left UF in the orbitofrontal region had a tendency to be larger, and the left CG of patients had a tendency to be smaller in the frontal lobe and larger in the parietal lobe. LIMITATIONS: This was a cross-sectional study. CONCLUSION: Our results suggest neurodevelopmental abnormalities in the left AF in patients with BD. The statistical tendencies observed for the left UF and left CG deserve further study.
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