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Mueller C, Adams M, Abrajano C, Yousefi R, Dalusag KS, Hui T, Su W, Fuchs J, Chiu B. A standardized treatment protocol for pilonidal disease can influence the health mindset of adolescents. Langenbecks Arch Surg 2024; 409:93. [PMID: 38467936 DOI: 10.1007/s00423-024-03282-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 03/06/2024] [Indexed: 03/13/2024]
Abstract
PURPOSE Pilonidal disease (PD) significantly impacts patients' quality of life and requires regular maintenance behaviors to achieve cure. Health mindset is a psychological construct which can influence health behaviors and outcomes, with a growth mindset being associated with better outcomes than a fixed. We propose that participation in a standardized treatment protocol can affect the health mindset for adolescents with pilonidal disease. METHODS PD patients' demographics, recurrence, and comorbidities were prospectively collected from 2019 to 2022. We assessed patients' mindset score at initial presentation using the validated Three-Item Mindset Scale (1-6) then reassessed during follow-up. t-test was used to compare baseline and follow-up mindset scores and stratified by recurrence or comorbidities. p ≤ 0.05 was considered significant. RESULTS A total of 207 PD patients (108 males, 99 females) with mean age 18.2 ± 3.7 years were followed for 351 ± 327 days. Mean baseline mindset score (4.76 ± 1.27) was significantly lower than mean follow-up mindset score (5.03 ± 1.18, p = 0.049). Baseline mindset score was significantly lower among patients with PD recurrence (4.00 ± 0.66) compared to those without recurrence (4.8 ± 1.29, p = 0.05). Among patients with PD recurrence, mean baseline mindset score (4.00 ± 0.66) was significantly lower than mean follow-up mindset score (5.27 ± 0.93, p = 0.0038). Patient comorbidity did not affect the baseline or follow-up mindset score. CONCLUSIONS Participation in a standardized treatment protocol is associated with the development of a stronger growth mindset over time for patients with PD. Furthermore, a growth mindset was linked to lower recurrence rate than a fixed mindset. Further investigations into how treatment approaches can work in concert with health mindset are proposed.
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Affiliation(s)
- Claudia Mueller
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Madeline Adams
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Claire Abrajano
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, USA
| | - Kyla Santos Dalusag
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Thomas Hui
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Wendy Su
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Julie Fuchs
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA
| | - Bill Chiu
- Department of Surgery, Stanford University, 453 Quarry Road, Stanford, Palo Alto, CA, 94304, USA.
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Sabapaty A, Salimi-Jazi F, Abrajano C, Yousefi R, Garza D, Dalusag KS, Hui T, Su W, Mueller C, Fuchs J, Chiu B. Comorbidities are not associated with pain symptom or recurrence in patients with pilonidal disease. Pediatr Surg Int 2024; 40:66. [PMID: 38436736 DOI: 10.1007/s00383-024-05644-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/28/2024] [Indexed: 03/05/2024]
Abstract
BACKGROUND Comorbidities can potentially impact the presentation or outcome of patients with pilonidal disease (PD) due to poor wound healing or increased inflammatory response. We hypothesized that certain comorbidities could lead to worse pain or higher recurrence rate. METHODS A retrospective study was performed on all PD patients treated with standardized minimally invasive protocol at our clinic 2019-2022. Patients' demographics, comorbidities, initial/follow-up pain score, pain duration, and recurrence were recorded. Data were analyzed by t test and Chi-square test. RESULTS Of 207 total PD patients (108 male, 99 female), 61 had comorbidities. Mean age was 18.2 years. The recurrence rate was 7%, and patients with recurrence were significantly younger. Associated comorbidities included mood/psychiatric disorders (31%), asthma/respiratory illness (30%), obesity-related illness (15%), gastrointestinal disorders (13%), diabetes (10%), thyroid disease (8%), cardiac disease (8%), musculoskeletal/connective tissue disorders (7%), immunologic disease (7%), inflammatory bowel disease (5%), and chest wall disorders (3%). The presence of comorbidities was not associated with PD recurrence. By dividing patients into adolescents (< 18 years) and adults (≥ 18 years), we found no association between comorbidity and recurrence in either group. 55% of patients had pain as an initial symptom. The initial pain score, pain duration, and pain score at follow-up were not associated with comorbidities. The comorbidities and recurrence were not associated with patient age or sex. CONCLUSIONS Having comorbidities was not associated with pain symptoms or recurrence in PD patients. Even though patients with recurrence were younger, there was no association between comorbidity and recurrence in either adolescents or adults.
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Affiliation(s)
- Akanksha Sabapaty
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Fereshteh Salimi-Jazi
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Claire Abrajano
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, 301 University Boulevard Galveston, University of Texas Medical Branch, 108 Basic Science Building, Galveston, TX, 77555, USA
| | - Deanna Garza
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Kyla Santos Dalusag
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Thomas Hui
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Wendy Su
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Claudia Mueller
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Julie Fuchs
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA
| | - Bill Chiu
- Department of Surgery, Stanford University School of Medicine, 453 Quarry Road, Palo Alto, CA, 94304, USA.
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Salimi-Jazi F, Abrajano C, Yousefi R, Garza D, Dalusag KS, Sabapaty A, Rafeeqi T, Hui T, Su W, Mueller C, Fuchs J, Chiu B. Increasing Amount of Hair Reduction Using Laser Correlates With Lower Probability of Recurrence in Patients With Pilonidal Disease. J Pediatr Surg 2023:S0022-3468(23)00174-4. [PMID: 36934004 DOI: 10.1016/j.jpedsurg.2023.02.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 02/20/2023] [Indexed: 03/20/2023]
Abstract
BACKGROUND Hair at the gluteal cleft plays a key role in the development and recurrence of pilonidal disease (PD). We hypothesized that more hair reduction achieved using laser could correlate with lower chance of PD recurrence. METHODS PD patients who underwent laser epilation (LE) were categorized by Fitzpatrick skin type, hair color, and hair thickness. Photos taken at LE sessions were compared to determine hair reduction amount. LE sessions completed prior to the recurrences were recorded. Groups were compared using multivariate T-test. RESULTS 198 PD patients had mean age 18.1 ± 3.6 years. 21, 156, and 21 patients had skin types 1/2, 3/4, and 5/6, respectively. 47 patients had light- and 151 had dark-colored hair. 29 patients had fine hair, 129 medium, and 40 thick. Median follow-up was 217 days. 95%, 70%, 40%, and 19% of patients reached 20%, 50%, 75%, and 90% hair reduction after mean LE sessions of 2.6, 4.3, 6.6, 7.8 sessions, respectively. To reach 75% hair reduction, patients require a mean of 4.8-6.8 LE sessions, depending on different skin/hair characteristics. PD recurrence rate was 6%. Probability of recurrence after 20%, 50%, 75% hair reduction was decreased by 50%, 78%, 100%, respectively. Dark hair and skin type 5/6 were associated with higher recurrence rates. CONCLUSION Patients with dark-color and thick hair require more LE sessions to achieve certain degree of hair reduction. Patients with dark hair and skin type 5/6 were more likely to recur; more hair reduction correlated with lower chance of recurrence. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Fereshteh Salimi-Jazi
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Claire Abrajano
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, USA
| | - Deanna Garza
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Kyla Santos Dalusag
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Akanksha Sabapaty
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Talha Rafeeqi
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Thomas Hui
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Wendy Su
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Claudia Mueller
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Julie Fuchs
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA
| | - Bill Chiu
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Stanford, CA, USA.
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Salimi-Jazi F, Abrajano C, Garza D, Rafeeqi T, Yousefi R, Hartman E, Hah K, Wilcox M, Diyaolu M, Chao S, Su W, Hui T, Mueller C, Fuchs J, Chiu B. Burden of pilonidal disease and improvement in quality of life after treatment in adolescents. Pediatr Surg Int 2022; 38:1453-1459. [PMID: 35842877 DOI: 10.1007/s00383-022-05175-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/06/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE Pilonidal Disease (PD) affects adolescents in different aspects. We hypothesized that patients with different gender, ethnicity, and age have different quality of life (QOL) measurements which could improve with minimally invasive treatment (MIT). METHODS 131 PD patients underwent MIT (laser epilation ± trephination) from 2019 to 2021. Patients' demographics were recorded. Before and after MIT, patients received QOL questionnaire consisting of four categories: daily activities, sports participation, school/work attendance, and socializing. Data were analyzed using Student and multivariate t test. P < 0.05 was considered statistically significant. RESULTS 101 (51 male, 50 female) patients were included. 30 patients with incomplete data were excluded. 54% of patients were < 18 years old. 47.5% were Hispanic. Median symptom duration prior to presentation was 5.4 (1.3-15) months. Prior to MIT, patients' ability to perform daily activities, participate in sports, attend school/work, and socialize was moderately or severely impacted in 66%, 57%, 45%, and 23% of respondents, respectively; after MIT, only 7%, 8%, 2%, and 4% were affected (p < 0.01). Recurrence rate was 6%. Pre-MIT, older patients and non-Hispanics reported worse impact on their QOL. Symptom duration or PD recurrence did not correlate with patient's pre- or post-MIT QOL. CONCLUSION Patients' ethnicity and age impacted QOL in PD. All patients' QOL significantly improved with MIT. Considering the importance of socializing, playing sports, and school/work attendance in adolescents, our study highlights importance of early treatment of PD.
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Affiliation(s)
- Fereshteh Salimi-Jazi
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Claire Abrajano
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Deanna Garza
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Talha Rafeeqi
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, USA
| | - Emi Hartman
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Kira Hah
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Melissa Wilcox
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Modupeola Diyaolu
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Stephanie Chao
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Wendy Su
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Thomas Hui
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Claudia Mueller
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Julie Fuchs
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA
| | - Bill Chiu
- Division of Pediatric Surgery, Department of Surgery, Stanford University, Palo Alto, CA, 94304, USA.
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Chen C, Yu B, Yousefi R, Iwahara J, Pettitt BM. Assessment of the Components of the Electrostatic Potential of Proteins in Solution: Comparing Experiment and Theory. J Phys Chem B 2022; 126:4543-4554. [PMID: 35696448 PMCID: PMC9832648 DOI: 10.1021/acs.jpcb.2c01611] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
In this work, the components of the protein electrostatic potentials in solution are analyzed with NMR paramagnetic relaxation enhancement experiments and compared with continuum solution theory, and multiscale simulations. To determine the contributions of the solution components, we analyze them at different ionic strengths from 0 to 745 mM. A theoretical approximation allows the determination of the electrostatic potential at a given proton without reference to the protein structure given the ratio of paramagnetic relaxation enhancements rates between a cationic and an anionic probe. The results derived from simulations show good agreement with experiment and simple continuum solvent theory for many of the residues. A discrepancy including a switch of sign of the electrostatic potential was observed for particular residues. By considering the components of the potential, we found the discrepancy is mainly caused by angular correlations of the probe molecules with these residues. The correction for the correlations allows a more accurate analysis of the experiments determining the electrostatic potential of proteins in solution.
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Affiliation(s)
| | | | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - Junji Iwahara
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - B. Montgomery Pettitt
- Department of Biochemistry and Molecular Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555, United States
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Yousefi R, Lynch GC, Galbraith M, Pettitt BM. Reconstruction of solvent structure: contribution of higher-order proximal distribution functions. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.2778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Yousefi R, Lynch GC, Galbraith M, Pettitt BM. Contributions of higher-order proximal distribution functions to solvent structure around proteins. J Chem Phys 2021; 155:104110. [PMID: 34525817 DOI: 10.1063/5.0062580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The proximal distribution function (pDF) quantifies the probability of finding a solvent molecule in the vicinity of solutes. The approach constitutes a hierarchically organized theory for constructing approximate solvation structures around solutes. Given the assumption of universality of atom cluster-specific solvation, reconstruction of the solvent distribution around arbitrary molecules provides a computationally convenient route to solvation thermodynamics. Previously, such solvent reconstructions usually considered the contribution of the nearest-neighbor distribution only. We extend the pDF reconstruction algorithm to terms including next-nearest-neighbor contribution. As a test, small molecules (alanine and butane) are examined. The analysis is then extended to include the protein myoglobin in the P6 crystal unit cell. Molecular dynamics simulations are performed, and solvent density distributions around the solute molecules are compared with the results from different pDF reconstruction models. It is shown that the next-nearest-neighbor modification significantly improves the reconstruction of the solvent number density distribution in concave regions and between solute molecules. The probability densities are then used to calculate the solute-solvent non-bonded interaction energies including van der Waals and electrostatic, which are found to be in good agreement with the simulated values.
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Affiliation(s)
- Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555-0304, USA
| | - Gillian C Lynch
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555-0304, USA
| | - Madeline Galbraith
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555-0304, USA
| | - B Montgomery Pettitt
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555-0304, USA
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Yousefi R, Rowicka M. Stochasticity of replication forks' speeds plays a key role in the dynamics of DNA replication. PLoS Comput Biol 2019; 15:e1007519. [PMID: 31869320 PMCID: PMC6975548 DOI: 10.1371/journal.pcbi.1007519] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 01/22/2020] [Accepted: 10/29/2019] [Indexed: 11/26/2022] Open
Abstract
Eukaryotic DNA replication is elaborately orchestrated to duplicate the genome timely and faithfully. Replication initiates at multiple origins from which replication forks emanate and travel bi-directionally. The complex spatio-temporal regulation of DNA replication remains incompletely understood. To study it, computational models of DNA replication have been developed in S. cerevisiae. However, in spite of the experimental evidence of forks’ speed stochasticity, all models assumed that forks’ speeds are the same. Here, we present the first model of DNA replication assuming that speeds vary stochastically between forks. Utilizing data from both wild-type and hydroxyurea-treated yeast cells, we show that our model is more accurate than models assuming constant forks’ speed and reconstructs dynamics of DNA replication faithfully starting both from population-wide data and data reflecting fork movement in individual cells. Completion of replication in a timely manner is a challenge due to its stochasticity; we propose an empirically derived modification to replication speed based on the distance to the approaching fork, which promotes timely completion of replication. In summary, our work discovers a key role that stochasticity of the forks’ speed plays in the dynamics of DNA replication. We show that without including stochasticity of forks’ speed it is not possible to accurately reconstruct movement of individual replication forks, measured by DNA combing. DNA replication in eukaryotes starts from multiple sites termed replication origins. Replication timing at individual sites is stochastic, but reproducible population-wide. Complex and not yet completely understood mechanisms ensure that genome is replicated exactly once and that replication is finished in time. This complex spatio-temporal organization of DNA replication makes computational modeling a useful tool to study replication mechanisms. For simplicity, all previous models assumed constant replication forks’ speed. Here, we show that such models are incapable of accurately reconstructing distances travelled by individual replication forks. Therefore, we propose a model assuming that replication speed varies stochastically between forks. We show that such model reproduces faithfully distances travelled by individual replication forks. Moreover, our model is simpler than previous model and thus avoids over-learning (fitting noise). We also discover how replication speed may be attuned to timely complete replication. We propose that forks’ speed increases with diminishing distance to the approaching fork, which we show promotes timely completion of replication. Such speed up can be e.g. explained by a synergy effect of chromatin unwinding by both forks. Our model can be used to simulate phenomena beyond replication, e.g. DNA double-strand breaks resulting from broken replication forks.
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Affiliation(s)
- Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
| | - Maga Rowicka
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
- Institute of Translational Sciences, University of Texas Medical Branch at Galveston, Galveston, Texas, United States of America
- * E-mail:
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Borzou A, Yousefi R, Sadygov RG. Another look at matrix correlations. Bioinformatics 2019; 35:4748-4753. [PMID: 31081021 PMCID: PMC6853692 DOI: 10.1093/bioinformatics/btz281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 04/03/2019] [Accepted: 04/15/2019] [Indexed: 11/12/2022] Open
Abstract
MOTIVATION High throughput technologies are widely employed in modern biomedical research. They yield measurements of a large number of biomolecules in a single experiment. The number of experiments usually is much smaller than the number of measurements in each experiment. The simultaneous measurements of biomolecules provide a basis for a comprehensive, systems view for describing relevant biological processes. Often it is necessary to determine correlations between the data matrices under different conditions or pathways. However, the techniques for analyzing the data with a low number of samples for possible correlations within or between conditions are still in development. Earlier developed correlative measures, such as the RV coefficient, use the trace of the product of data matrices as the most relevant characteristic. However, a recent study has shown that the RV coefficient consistently overestimates the correlations in the case of low sample numbers. To correct for this bias, it was suggested to discard the diagonal elements of the outer products of each data matrix. In this work, a principled approach based on the matrix decomposition generates three trace-independent parts for every matrix. These components are unique, and they are used to determine different aspects of correlations between the original datasets. RESULTS Simulations show that the decomposition results in the removal of high correlation bias and the dependence on the sample number intrinsic to the RV coefficient. We then use the correlations to analyze a real proteomics dataset. AVAILABILITY AND IMPLEMENTATION The python code can be downloaded from http://dynamic-proteome.utmb.edu/MatrixCorrelations.aspx. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Ahmad Borzou
- Department of Biochemistry and Molecular Biology, Sealy Center for Molecular Medicine, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, Sealy Center for Molecular Medicine, The University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Rovshan G Sadygov
- Department of Biochemistry and Molecular Biology, Sealy Center for Molecular Medicine, The University of Texas Medical Branch, Galveston, TX 77555, USA
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Zhu Y, Biernacka A, Pardo B, Dojer N, Forey R, Skrzypczak M, Fongang B, Nde J, Yousefi R, Pasero P, Ginalski K, Rowicka M. qDSB-Seq is a general method for genome-wide quantification of DNA double-strand breaks using sequencing. Nat Commun 2019; 10:2313. [PMID: 31127121 PMCID: PMC6534554 DOI: 10.1038/s41467-019-10332-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 04/30/2019] [Indexed: 12/04/2022] Open
Abstract
DNA double-strand breaks (DSBs) are among the most lethal types of DNA damage and frequently cause genome instability. Sequencing-based methods for mapping DSBs have been developed but they allow measurement only of relative frequencies of DSBs between loci, which limits our understanding of the physiological relevance of detected DSBs. Here we propose quantitative DSB sequencing (qDSB-Seq), a method providing both DSB frequencies per cell and their precise genomic coordinates. We induce spike-in DSBs by a site-specific endonuclease and use them to quantify detected DSBs (labeled, e.g., using i-BLESS). Utilizing qDSB-Seq, we determine numbers of DSBs induced by a radiomimetic drug and replication stress, and reveal two orders of magnitude differences in DSB frequencies. We also measure absolute frequencies of Top1-dependent DSBs at natural replication fork barriers. qDSB-Seq is compatible with various DSB labeling methods in different organisms and allows accurate comparisons of absolute DSB frequencies across samples.
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Affiliation(s)
- Yingjie Zhu
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA
| | - Anna Biernacka
- Laboratory of Bioinformatics and Systems Biology, Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02-089, Warsaw, Poland
| | - Benjamin Pardo
- Institut de Génétique Humaine, CNRS, Equipe Labellisée Ligue contre le Cancer, Université de Montpellier, 141 rue de la Cardonille, Montpellier, 34396, France
| | - Norbert Dojer
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA
- Institute of Informatics, University of Warsaw, Stefana Banacha 2, 02-097, Warsaw, Poland
| | - Romain Forey
- Institut de Génétique Humaine, CNRS, Equipe Labellisée Ligue contre le Cancer, Université de Montpellier, 141 rue de la Cardonille, Montpellier, 34396, France
| | - Magdalena Skrzypczak
- Laboratory of Bioinformatics and Systems Biology, Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02-089, Warsaw, Poland
| | - Bernard Fongang
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA
| | - Jules Nde
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA
| | - Razie Yousefi
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA
| | - Philippe Pasero
- Institut de Génétique Humaine, CNRS, Equipe Labellisée Ligue contre le Cancer, Université de Montpellier, 141 rue de la Cardonille, Montpellier, 34396, France
| | - Krzysztof Ginalski
- Laboratory of Bioinformatics and Systems Biology, Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02-089, Warsaw, Poland
| | - Maga Rowicka
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA.
- Institute for Translational Sciences, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA.
- Sealy Center for Molecular Medicine, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, Texas, 77555, USA.
- Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, TX, 77555, USA.
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D. Firuzabadi F, Asadi Z, Yousefi R. Synthesis of new nano Schiff base complexes: X-ray crystallography, thermal, electrochemical and anticancer studies of nano uranyl Schiff base complexes. B CHEM SOC ETHIOPIA 2018. [DOI: 10.4314/bcse.v32i1.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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12
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Kashani MR, Yousefi R, Akbarian M, Alavianmehr MM, Ghasemi Y. Structure, Chaperone Activity, and Aggregation of Wild-Type and R12C Mutant αB-Crystallins in the Presence of Thermal Stress and Calcium Ion - Implications for Role of Calcium in Cataract Pathogenesis. Biochemistry (Mosc) 2016; 81:122-34. [PMID: 27260392 DOI: 10.1134/s0006297916020061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The current study was performed with the aim to evaluate the chaperoning ability, structural features, and aggregation propensity of wild-type and R12C mutant αB-crystallins (αB-Cry) under thermal stress and in the presence of calcium ion. The results of different spectroscopic analyses suggest that wild-type and mutant αB-Cry have dissimilar secondary and tertiary structures. Moreover, αB-Cry indicates slightly improved chaperone activity upon the R12C mutation. Thermal stress and calcium, respectively, enhance and reduce the extent of solvent-exposed hydrophobic surfaces accompanying formation of ordered and non-ordered aggregate entities in both proteins. Compared to the wild-type protein, the R12C mutant counterpart shows significant resistance against thermal and calcium-induced aggregation. In addition, in the presence of calcium, significant structural variation was accompanied by reduction in the solvent-exposed hydrophobic patches and attenuation of chaperone activity in both proteins. Additionally, gel mobility shift assay indicates the intrinsic propensity of R12C mutant αB-Cry for disulfide bridge-mediated protein dimerization. Overall, the results of this study are of high significance for understanding the molecular details of different factors that are involved in the pathomechanism of cataract disorders.
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Affiliation(s)
- M Ragerdi Kashani
- Shiraz University, Protein Chemistry Laboratory (PCL), Department of Biology, Shiraz, 71345, Iran.
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Gharibzahedi S, Ansarifard I, Hasanabadi YS, Ghahderijani M, Yousefi R. Physicochemical properties of Moringa peregrina seed and its oil. Quality Assurance and Safety of Crops & Foods 2013. [DOI: 10.3920/qas2012.0172] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- S.M.T. Gharibzahedi
- Faculty of Agricultural Engineering and Technology, Department of Food Science, Engineering & Technology, University of Tehran, P.O. Box 4111, Karaj 31587-77871, Iran
| | - I. Ansarifard
- Department of Agronomy, College of Agriculture, Shahryar, Iran
| | - Y. Sadeghi Hasanabadi
- Department of Food Science & Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - M. Ghahderijani
- Department of Agricultural Mechanization & Machinery, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - R. Yousefi
- Department of Agricultural Mechanization & Machinery, Qazvin Center, Institute of Scientific-Applied Higher Education of Jihad-e-Agriculture, Qazvin, Iran
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14
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Wiebe E, Yousefi R, Ramji F, Isbister A, Trouton K. How can we best train primary care providers to insert IUDs? Contraception 2012. [DOI: 10.1016/j.contraception.2012.05.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Yousefi R, Ostadabbas S, Faezipour M, Farshbaf M, Nourani M, Tamil L, Pompeo M. Bed posture classification for pressure ulcer prevention. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:7175-8. [PMID: 22255993 DOI: 10.1109/iembs.2011.6091813] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Pressure ulcer is an age-old problem imposing a huge cost to our health care system. Detecting and keeping record of the patient's posture on bed, help care givers reposition patient more efficiently and reduce the risk of developing pressure ulcer. In this paper, a commercial pressure mapping system is used to create a time-stamped, whole-body pressure map of the patient. An image-based processing algorithm is developed to keep an unobtrusive and informative record of patient's bed posture over time. The experimental results show that proposed algorithm can predict patient's bed posture with up to 97.7% average accuracy. This algorithm could ultimately be used with current support surface technologies to reduce the risk of ulcer development.
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Affiliation(s)
- R Yousefi
- Quality of Life Technology Laboratory The University of Texas at Dallas, Richardson, TX 75080, USA.
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16
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Alikhani M, Aslani M, Zavari A, Yousefi R, Zamani A. P121 Antibiotic resistance, HeLa-cell adherence and PCR analysis of enteroaggragative Escherichia coli (EAEC) clinical isolates. Int J Antimicrob Agents 2009. [DOI: 10.1016/s0924-8579(09)70340-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Amani M, Yousefi R, Moosavi-Movahedi A, Pintus F, Mura A, Floris G, Kurganov B, Saboury A. Structural Changes and Aggregation Process of Cu/Containing Amine Oxidase in the Presence of 2,2,2-Trifluoroethanol. Protein Pept Lett 2008; 15:521-7. [DOI: 10.2174/092986608784567636] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Moosavi-Movahedi AA, Pirzadeh P, Hashemnia S, Ahmadian S, Hemmateenejad B, Amani M, Saboury AA, Ahmad F, Shamsipur M, Hakimelahi GH, Tsai FY, Alijanvand HH, Yousefi R. Fibril formation of lysozyme upon interaction with sodium dodecyl sulfate at pH 9.2. Colloids Surf B Biointerfaces 2007; 60:55-61. [PMID: 17616361 DOI: 10.1016/j.colsurfb.2007.05.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2006] [Revised: 05/25/2007] [Accepted: 05/25/2007] [Indexed: 11/26/2022]
Abstract
Fibril formation seems to be a general property of all proteins. Its occurrence in hen or human lysozyme depends on certain conditions, namely acidic pHs or the presence of some additives. This paper studies the interaction of lysozyme with sodium dodecyl sulfate (SDS) at pH 9.2, using UV-visible spectrophotometry, circular dichroism (CD) spectropolarimetry, electron microscopy (EM) and chemometry. Based on observations such as the strange increase in absorbance at 650nm (pH 9.2) and the presence of intermediates, it is assumed that lysozyme fibrils have been formed at pH 9.2 in the presence of SDS as an anionic surfactant. Thioflavin T emission fluorescence and an EM image confirmed this assumption. beta-cyclodextrin was then used as a turbidity inhibitor to establish its effect on the distribution of intermediates that participate in fibril formation.
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Divsalar A, Saboury AA, Yousefi R, Moosavi-Movahedi AA, Mansoori-Torshizi H. Spectroscopic and cytotoxic studies of the novel designed palladium(II) complexes: β-Lactoglobulin and K562 as the targets. Int J Biol Macromol 2007; 40:381-6. [PMID: 17097727 DOI: 10.1016/j.ijbiomac.2006.09.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2006] [Revised: 09/25/2006] [Accepted: 09/26/2006] [Indexed: 11/20/2022]
Abstract
Since palladium complexes have been reported to show fewer side effects relative to other heavy metal anticancer compounds, in this study a new class of four structurally related anticancer Pd(II) complexes including 2,2'-bipyridin-n-butyl dithiocarbamato Pd(II) nitrate (Com-1), 2,2'-bipyridin-n-hexyl dithiocarbamato Pd(II) nitrate (Com-2), 2,2'-bipyridin glycinato Pd(II) nitrate (Com-3) and 2,2'-bipyridin octylglycinato Pd(II) nitrate (Com-4) was designed. The effect of four synthesized ligands on the protein structure and cell proliferation were investigated. Whey carrier proteins beta-lactoglobulin-A and-B (BLG-A and-B) and chronic myelogenous leukemia cell line K562 were the targets. Fluorescence and CD instruments were used to assess effect of the ligands on the protein structure. Growth inhibitory effect of the Pd(II) complexes towards the cancer cells was measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Results of fluorescence studies revealed that the complexes had no dithiocarbamate moiety (compounds 3 and 4) could quench the intrinsic fluorescence emission of the proteins at lower concentrations than those had such moiety (compounds 1 and 2). The far-UV-CD studies revealed that the regular secondary structure of BLG-A and -B did not show any noticeable alteration upon interaction with different of Pd(II)-complexes. The results of cell proliferation assay also displayed that Com-1 and Com-2 had more growth inhibitory activity against K562, than Com-3 and Com-4. Our results suggested that addition of dithiocarbamate moiety to structure of Pd(II) complexes probably has important role to improve the antiproliferative properties of the anticancer ligands and fewer effects on the carrier protein structure.
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Affiliation(s)
- A Divsalar
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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Ziaee V, Razaei M, Ahmadinejad Z, Shaikh H, Yousefi R, Yarmohammadi L, Bozorgi F, Behjati MJ. The changes of metabolic profile and weight during Ramadan fasting. Singapore Med J 2006; 47:409-14. [PMID: 16645692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
INTRODUCTION Ramadan is the holiest month in the Islamic calendar and Muslims fast during this month. We designed this study to evaluate the effect of Ramadan fasting on plasma lipids and lipoproteins. METHODS This cohort study was performed during Ramadan in December 2002 (Islamic year 1423). The subjects were 81 students of Tehran University of Medical Sciences. We evaluated weight, body mass index (BMI), glucose, triglyceride (TG), cholesterol, low density lipoprotein (LDL), high density lipoprotein (HDL), and very low density lipoprotein (VLDL), before and after Ramadan. RESULTS Body weight and BMI both decreased during Ramadan fasting in both genders. Glucose and HDL decreased and LDL increased significantly during fasting in Ramadan, but there was no significant change in total cholesterol, TG and VLDL. We did not find any association between TG, cholesterol, LDL, VLDL, HDL and the following variables: sex, body weight changes, and two or three instances of meals before Ramadan. Triglyceride level also increased in students with normal BMI while it decreased in overweight subjects. CONCLUSION This study indicated that Ramadan fasting led to a decrease in glucose and weight. Although there was a significant reduction in meal frequency, a significant increase in LDL and decrease in HDL was noted during Ramadan. It seems that the effect of Ramadan fasting on serum lipid levels may be closely related to the nutritional diet or biochemical response to starvation.
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Affiliation(s)
- V Ziaee
- Islamic Medicine Research Centre, Tehran University of Medical Sciences, Iran.
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