Project description:By combining extensive biochemical fractionation with quantitative mass spectrometry, we directly examined the composition of soluble multiprotein complexes among diverse animal models. The project has been jointly supervised by Andrew Emili and Edward M. Marcotte. Project website: http://metazoa.med.utoronto.ca
Project description:Analysis of ex vivo isolated lymphatic endothelial cells from the dermis of patients to define type 2 diabetes-induced changes. Results preveal aberrant dermal lymphangiogenesis and provide insight into its role in the pathogenesis of persistent skin inflammation in type 2 diabetes. The ex vivo dLEC transcriptome reveals a dramatic influence of the T2D environment on multiple molecular and cellular processes, mirroring the phenotypic changes seen in T2D affected skin. The positively and negatively correlated dLEC transcripts directly cohere to prolonged inflammatory periods and reduced infectious resistance of patients´ skin. Further, lymphatic vessels might be involved in tissue remodeling processes during T2D induced skin alterations associated with impaired wound healing and altered dermal architecture. Hence, dermal lymphatic vessels might be directly associated with T2D disease promotion.
Project description:Kynureninase is a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes known as the aspartate aminotransferase superfamily or alpha-family. The Homo sapiens and other eukaryotic constitutive kynureninases preferentially catalyze the hydrolytic cleavage of 3-hydroxy-l-kynurenine to produce 3-hydroxyanthranilate and l-alanine, while l-kynurenine is the substrate of many prokaryotic inducible kynureninases. The human enzyme was cloned with an N-terminal hexahistidine tag, expressed, and purified from a bacterial expression system using Ni metal ion affinity chromatography. Kinetic characterization of the recombinant enzyme reveals classic Michaelis-Menten behavior, with a Km of 28.3 +/- 1.9 microM and a specific activity of 1.75 micromol min-1 mg-1 for 3-hydroxy-dl-kynurenine. Crystals of recombinant kynureninase that diffracted to 2.0 A were obtained, and the atomic structure of the PLP-bound holoenzyme was determined by molecular replacement using the Pseudomonas fluorescens kynureninase structure (PDB entry 1qz9) as the phasing model. A structural superposition with the P. fluorescens kynureninase revealed that these two structures resemble the "open" and "closed" conformations of aspartate aminotransferase. The comparison illustrates the dynamic nature of these proteins' small domains and reveals a role for Arg-434 similar to its role in other AAT alpha-family members. Docking of 3-hydroxy-l-kynurenine into the human kynureninase active site suggests that Asn-333 and His-102 are involved in substrate binding and molecular discrimination between inducible and constitutive kynureninase substrates.
Project description:The ~52,000 sample Type 2 Diabetes Exome Sequencing project is a collaboration of six consortia with various funding mechanisms that have joined together to investigate genetic variants for type 2 diabetes (T2D) using the largest T2D case/control sample set compiled to date. This includes samples from: <ul> <li>Type 2 Diabetes Genetic Exploration by Next-generation sequencing in Multi-Ethnic Samples (T2D-GENES)</li> <li>Genetics of Type 2 Diabetes (GoT2D)</li> <li>Exome Sequencing Project (ESP)</li> <li>Slim Initiative in Genomic Medicine for the Americas (SIGMA)</li> <li>Lundbeck Foundation Centre for Applied Medical Genomics in Personalised Disease Prediction, Prevention, and Care (LuCAMP)</li> <li>Progress in Diabetes Genetics in Youth (ProDIGY)</li> </ul> <p>This data generated from the Hong Kong cohort was part of the T2D-GENES (Type 2 Diabetes Genetic Exploration by Next-generation sequencing in multi-Ethnic Samples) consortium, which is a NIDDK-funded international research consortium that seeks to identify genetic variants for type 2 diabetes (T2D) through multiethnic sequencing studies. The T2D-GENES Project is a multi-ethnic sequencing study designed to assess whether less common variants play a role in T2D risk and to assess similarities and differences in the distribution of T2D risk variants across ancestry groups. </p> <p>The individuals were obtained from over 20 cohorts across the 6 consortia that are listed in Table 1. The strategy was to perform deep exome sequencing of individuals, 24,991 with T2D and 24,953 controls, divided among five ancestry groups: Europeans, East Asians, South Asians, American Hispanics, and African Americans. The T2D-GENES, ProDIGY and SIGMA studies, sequencing was performed at the Broad Institute using the Agilent v2 capture reagent or Illumina Rapid Capture on Illumina HiSeq machines. Please note that while we summarize the full sample list in publications and below, two of the cohorts below are not in dbGAP, due to the samples not being consented for deposition. This includes the Kooperative Gesundheitsforschung in der Region Augsburg (KORA) study and Lundbeck Foundation Centre for Applied Medical Genomics in Personalised Disease Prediction, Prevention, and Care (LuCamp) study. The Exome Sequencing Project (ESP) was deposited in dbGAP as part of their initial study and the phs numbers for that project can be found here: https://esp.gs.washington.edu/drupal/dbGaP_Releases. </p> <p><b>Table 1.</b> 52,000 sample T2D Case/Control Whole Exome Sequencing Studies</p> <table border="1"> <tr> <th><b>Ancestry</b></th> <th>Consortia</th> <th><b>Study</b></th> <th><b>Countries of Origin</b></th> <th><b># Cases</b></th> <th><b># Controls</b></th> </tr> <tr> <td>African American</td> <td>T2D-GENES Project 1</td> <td>Jackson Heart Study</td> <td>US</td> <td>500</td> <td>526</td> </tr> <tr> <td>African American</td> <td>T2D-GENES Project 1</td> <td>Wake Forest School of Medicine Study</td> <td>US</td> <td>518</td> <td>530</td> </tr> <tr> <td>African American</td> <td>ESP</td> <td>Exome Sequencing Project (ESP)</td> <td>US</td> <td>467</td> <td>1374</td> </tr> <tr> <td>African American</td> <td>T2D-GENES Follow-Up Study</td> <td>BioMe Biobank Program (BioMe)</td> <td>US</td> <td>1297</td> <td>1256</td> </tr> <tr> <td>East Asian</td> <td>T2D-GENES Project 1</td> <td>Korea Association Research Project</td> <td>Korea</td> <td>526</td> <td>561</td> </tr> <tr> <td>East Asian</td> <td>T2D-GENES Project 1 and Follow-Up Study</td> <td>Singapore Diabetes Cohort Study; Singapore Prospective Study Program</td> <td>Singapore (Chinese)</td> <td>1486</td> <td>1568</td> </tr> <tr> <td>East Asian</td> <td>T2D-GENES Follow-Up Study</td> <td>Korea SNUH</td> <td>South Korea</td> <td>450</td> <td>475</td> </tr> <tr> <td>East Asian</td> <td>T2D-GENES Follow-Up Study</td> <td>Research Studies in Hong Kong (Hong Kong)</td> <td>Hong Kong</td> <td>493</td> <td>485</td> </tr> <tr> <td>European</td> <td>T2D-GENES Project 1</td> <td>Ashkenazi</td> <td>US, Israel</td> <td>506</td> <td>352</td> </tr> <tr> <td>European</td> <td>T2D-GENES Project 1</td> <td>Metabolic Syndrome in Men Study (METSIM)</td> <td>Finland</td> <td>484</td> <td>498</td> </tr> <tr> <td>European</td> <td>GoT2D</td> <td>Finland-United States Investigation of NIDDM Genetics (FUSION) Study</td> <td>Finland</td> <td>472</td> <td>476</td> </tr> <tr> <td>European</td> <td>GoT2D</td> <td>Kooperative Gesundheitsforschung in der Region Augsburg (KORA)</td> <td>Germany</td> <td>97</td> <td>90</td> </tr> <tr> <td>European</td> <td>GoT2D</td> <td>UK Type 2 Diabetes Genetics Consortium (UKT2D)</td> <td>UK</td> <td>322</td> <td>320</td> </tr> <tr> <td>European</td> <td>GoT2D</td> <td>Malmö-Botnia Study</td> <td>Finland, Sweden</td> <td>478</td> <td>443</td> </tr> <tr> <td>European</td> <td>LuCamp</td> <td>Lundbeck Foundation Centre for Applied Medical Genomics in Personalised Disease Prediction, Prevention, and Care (LuCamp)</td> <td>Denmark</td> <td>997</td> <td>997</td> </tr> <tr> <td>European</td> <td>ESP</td> <td>Exome Sequencing Project (ESP)</td> <td>US</td> <td>390</td> <td>2843</td> </tr> <tr> <td>European</td> <td>T2D-GENES Follow-Up Study</td> <td>Genetics of Diabetes and Audit Research Tayside Study (GoDARTS)</td> <td>Scotland, UK</td> <td>960</td> <td>966</td> </tr> <tr> <td>European</td> <td>T2D-GENES Follow-Up Study</td> <td>Framingham Heart Study (FHS)</td> <td>US</td> <td>396</td> <td>596</td> </tr> <tr> <td>Hispanic</td> <td>T2D-GENES Project 1</td> <td>San Antonio Family Heart Study, San Antonio Family Diabetes/ Gallbladder Study, Veterans Administration Genetic Epidemiology Study, and the Investigation of Nephropathy and Diabetes Study Family Component</td> <td>US</td> <td>272</td> <td>218</td> </tr> <tr> <td>Hispanic</td> <td>T2D-GENES Project 1 and SIGMA v2</td> <td>Starr County, Texas</td> <td>US</td> <td>1762</td> <td>1738</td> </tr> <tr> <td>Hispanic</td> <td>SIGMA v1</td> <td>Mexico City Diabetes Study</td> <td>Mexico</td> <td>281</td> <td>549</td> </tr> <tr> <td>Hispanic</td> <td>SIGMA v1 and SIGMA v2</td> <td>Multiethnic Cohort (MEC)</td> <td>US</td> <td>1476</td> <td>1443</td> </tr> <tr> <td>Hispanic</td> <td>SIGMA v1 and SIGMA v2</td> <td>UNAM/INCMNSZ Diabetes Study (UIDS)</td> <td>Mexico</td> <td>1998</td> <td>1977</td> </tr> <tr> <td>Hispanic</td> <td>SIGMA v1 and SIGMA v2</td> <td>Diabetes in Mexico Study (DMS)</td> <td>Mexico</td> <td>1522</td> <td>1546</td> </tr> <tr> <td>Multiethnic</td> <td>ProDIGY</td> <td>Treatment Options for Type 2 Diabetes in Adolescents and Youth (TODAY)</td> <td>US</td> <td>3097</td> <td>0</td> </tr> <tr> <td>Multiethnic</td> <td>ProDIGY</td> <td>SEARCH for Diabetes in Youth (SEARCH)</td> <td>US</td> <td>553</td> <td>0</td> </tr> <tr> <td>South Asian</td> <td>T2D-GENES Project 1</td> <td>London Life Sciences Population Study (LOLIPOP)</td> <td>UK (Indian Asian)</td> <td>531</td> <td>538</td> </tr> <tr> <td>South Asian</td> <td>T2D-GENES Project 1 and Follow-Up Study</td> <td>Singapore Indian Eye Study</td> <td>Singapore (Indian Asian)</td> <td>1640</td> <td>1478</td> </tr> <tr> <td>South Asian</td> <td>T2D-GENES Follow-Up Study</td> <td>Pakistan Risk of Myocardial Infarction Study (PROMIS)</td> <td>Pakistan</td> <td>914</td> <td>932</td> </tr> </table> <p>The research studies in Hong Kong contributed 493 cases and 485 controls to T2D-GENES Follow-Up study.</p>