Diabetes Mellitus, Experimental/complications; Gene Expression Regulation, Developmental; Heart Septal Defects, Ventricular/genetics; Heart/embryology; Myocytes, Cardiac/chemistry; Neural Crest/chemistry; Truncus Arteriosus, Persistent/genetics; Animals; Apoptosis; Bone Morphogenetic Protein 4; Bone Morphogenetic Proteins/analysis; Bone Morphogenetic Proteins/genetics; Cell Proliferation; Diabetes Mellitus, Experimental/genetics; Diabetes Mellitus, Experimental/metabolism; Diabetes Mellitus, Experimental/pathology; Down-Regulation; Embryo, Mammalian/chemistry; Female; Heart Septal Defects, Ventricular/embryology; Heart Septal Defects, Ventricular/metabolism; Heart Septal Defects, Ventricular/pathology; MSX1 Transcription Factor/analysis; MSX1 Transcription Factor/genetics; Mice; Myocytes, Cardiac/ultrastructure; Neural Cell Adhesion Molecules/analysis; Neural Cell Adhesion Molecules/genetics; Neural Crest/embryology; Neural Crest/pathology; PAX3 Transcription Factor; Paired Box Transcription Factors/analysis; Paired Box Transcription Factors/genetics; Pregnancy; RNA, Messenger/analysis; Truncus Arteriosus, Persistent/embryology; Truncus Arteriosus, Persistent/metabolism; Truncus Arteriosus, Persistent/pathology; Ubiquitin Thiolesterase/analysis; Ubiquitin Thiolesterase/genetics