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• W2463344983 abstract "Nell1{sup 6R} is a chemically-induced point mutation in a novel cell-signaling gene, Nell1, which results in truncation of the protein and degradation of the Nell16R transcript. Earlier studies revealed that loss of Nell1 function reduces expression of numerous extracellular matrix (ECM) proteins required for differentiation of bone and cartilage precursor cells, thereby causing severe skull and spinal defects. Since skeletal and cardiovascular development are closely linked biological processes, this research focused on: a) examining Nell16R mutant mice for cardiovascular defects, b) determining Nell1 expression in fetal and adult hearts, and c) establishing how ECM genes affected by Nell1 infl uence heart development. Structural heart defects in Nell16R mutant fetuses were analyzed by heart length and width measurements and standard histological methods (haematoxylin and eosin staining). Nell1 expression was assayed in fetal and adult hearts using reverse transcription polymerase chain reaction (RT-PCR). A comprehensive bioinformatics analysis using public databases (Stanford SOURCE Search, Integrated Cartilage Gene Database, Mouse Genome Informatics, and NCBI UniGene) was undertaken to investigate the relationship between cardiovascular development and each of twentyeight genes affected by Nell1. Nell1-defi cient mice have signifi cantly enlarged hearts (particularly the heart width), dramatically reduced blood fl ow out of the heart and unexpanded lungs. Isolation of total RNAs from hearts of adult (control and heterozygote) and fetal (control and homozygous mutant) mice have been completed and RT-PCR assays are in progress. The bioinformatics analysis showed that the majority of genes with reduced expression in Nell1-defi cient mice are normally expressed in the heart (79%; 22/28), blood vessels (71%; 20/28) and bone marrow (61%; 17/28). Moreover, mouse mutations in seven of these genes (Col15a1, Osf-2, Bmpr1a, Pkd1, Mfge8, Ptger4, Col5a1) manifest abnormalities in cardiovascular development. These data demonstrate for the fi rst time that Nell1 has a role in early mammalian cardiovascular development, mediated by its regulation of ECM proteins necessary for normal cell growth and differentiation. In addition, understanding the mechanisms by which Nell1 and its associated ECM genes affect the cardiovascular system can provide future strategies for the treatment of heart and blood vessel defects." @default.
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• W2463344983 date "2007-01-01" @default.
• W2463344983 modified "2023-09-28" @default.
• W2463344983 title "CHARACTERIZING THE ROLE OF THE NELL1 GENE IN CARDIOVASCULAR DEVELOPMENT" @default.
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