Project I's long term goal is to fully characterize the genes that cause Cornelia de Lange Syndrome (CdLS) and to identify the downstream effectors of cohesin dysruption that are involved in the individual birth defects seen in constellation in CdLS. This addresses the Program's long-term goals of explaining the etiology of CdLS and how that relates to more common isolated structural birth defects. CdLS is a dominant, genetically heterogeneous, developmental disorder consisting of pleiotropic manifestations. Characteristic features include craniofacial dysmorphia, reduction defects of the upper extremities, gastroesophageal, cardiac and ophthalmologic abnormalities, growth retardation, and neurodevelopmental delay. We have shown that mutations in genes encoding structural (SMC1A and SMC3) and regulatory (NIPBL) elements of cohesin cause CdLS. Cohesin is best understood for its canonical role in regulating sister chromatid cohesion and chromosome segregation, however its'less well understood role in gene regulation appears to be the critical function disrupted in CdLS. Since identification of cohesin's role in causing CdLS, mutations in additional cohesin accessory factors (such as ESC02) have also been identified in human developmental disorders collectively termed "cohesinopathies". We have shown that partial disruption of cohesin function leads to a highly conserved pattern of gene dysregulation in CdLS-derived cell lines. We hypothesize that heterozygous mutations in cohesin regulatory and structural components that result in CdLS cause a specific pattern of downstream gene dysregulation in a temporal and tissue-specific manner that in turn results in the individual birth defects seen in constellation in CdLS. Identification of the downstream effectors of cohesin dysfunction will identify genes that are critical to these individual birth defects, such as limb defects, congenital heart defects, cleft palate and gastrointestinal abnormalities. Through the 3 Specific Aims proposed in this project we will further characterize the role of cohesin in gene regulation in humans, to understand how perturbation leads to CdLS, and to identify candidate genes that are regulated by cohesin that are important for the normal development of the structures that are affected in CdLS.
Cornelia de Lange syndrome (CdLS) is a multisystem genetic disorder manifesting manifold structural and cognitive abnormalities. This project will use cohesin mutant lymphoblastoid and induced pluripotent stem (IPS) cell lines established from individuals with CdLS to genomically characterize gene regulatory changes and identify candidate genes for isolated structural birth defects seen in constellation in CdLS. Information from these studies will lead to improved management for individuals with CdLS and related diagnoses.
|Yuen, Kobe C; Xu, Baoshan; Krantz, Ian D et al. (2016) NIPBL Controls RNA Biogenesis to Prevent Activation of the Stress Kinase PKR. Cell Rep 14:93-102|
|Lopez-Burks, Martha E; Santos, Rosaysela; Kawauchi, Shimako et al. (2016) Genetic enhancement of limb defects in a mouse model of Cornelia de Lange syndrome. Am J Med Genet C Semin Med Genet 172:146-54|
|Kawauchi, Shimako; Santos, Rosaysela; Muto, Akihiko et al. (2016) Using mouse and zebrafish models to understand the etiology of developmental defects in Cornelia de Lange Syndrome. Am J Med Genet C Semin Med Genet 172:138-45|
|Santos, Rosaysela; Kawauchi, Shimako; Jacobs, Russell E et al. (2016) Conditional Creation and Rescue of Nipbl-Deficiency in Mice Reveals Multiple Determinants of Risk for Congenital Heart Defects. PLoS Biol 14:e2000197|
|Dorsett, Dale (2016) The Drosophila melanogaster model for Cornelia de Lange syndrome: Implications for etiology and therapeutics. Am J Med Genet C Semin Med Genet 172:129-37|
|Wu, Yaning; Gause, Maria; Xu, Dongbin et al. (2015) Drosophila Nipped-B Mutants Model Cornelia de Lange Syndrome in Growth and Behavior. PLoS Genet 11:e1005655|
|Ramos, Feliciano J; Puisac, Beatriz; Baquero-Montoya, Carolina et al. (2015) Clinical utility gene card for: Cornelia de Lange syndrome. Eur J Hum Genet 23:|
|Izumi, Kosuke; Nakato, Ryuichiro; Zhang, Zhe et al. (2015) Germline gain-of-function mutations in AFF4 cause a developmental syndrome functionally linking the super elongation complex and cohesin. Nat Genet 47:338-44|
|Krantz, Ian D (2014) Cohesin embraces new phenotypes. Nat Genet 46:1157-8|
|Visnes, T; Giordano, F; Kuznetsova, A et al. (2014) Localisation of the SMC loading complex Nipbl/Mau2 during mammalian meiotic prophase I. Chromosoma 123:239-52|
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