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Research Article: NOTCH, ATIC, MRI, SLCA, ATPA Genetic Variations are Associated with Ventricular Septal Defect in the Chinese Tibetan Population Through Whole-Exome Sequencing

Date Published: 2023-04-27

Abstract:
Congenital heart disease (CHD) refers to cardiovascular malformations caused by abnormal development of cardiac vessels during the fetal period, which is the most common congenital dysplasia and also the main cause of non-infectious death in newborns and infants. CHD includes atrial septal defect (ASD), ventricular septal defect (VSD), pulmonary atresia (PA), patent ductus arteriosus (PDA), tetralogy of Fallot (TOF) and other cardiac malformations, among which the incidence of VSD is the highest, especially isolated VSD, and % of cases are combined with other malformations. The incidence of isolated muscular VSD has been reported to be .% in preterm infants and .–.% in term infants. While many VSD can close spontaneously, if they do not close, large defects can lead to deleterious complications such as pulmonary arterial hypertension (PAH), ventricular dysfunction, and an increased risk of arrhythmias. The low pressure and hypoxia in the Qinghai-Tibet Plateau can cause altitude sickness, and the incidence of CHD will increase with the increase of altitude. Therefore, it is inferred that the hypoxic and low pressure environment at plateau is closely related to the pathogenesis of CHD. According to epidemiology, the incidence of neonatal CHD in high-altitude areas is about times higher than that in low-altitude areas. In the Columbia region, rate of CHD has also been found to be much lower in plains than that in high-altitude regions. Ethnic and regional differences have significant roles in the occurrence of CHD, and the data have indicated that there may be ethnic differences in the prevalence of CHD in China. Malg et al have found that in China, the incidence of CHD in plain areas is not as high as that in Huangnan Tibetan Autonomous Prefecture and Yushu Tibetan Autonomous Prefecture in Qinghai Province. The above studies have shown that CHD in the Qinghai-Tibet Plateau area in China is characterized by high incidence and high mortality. The pathogenesis of CHD is not yet clear, and researchers think that there are two main factors for its occurrence, environmental factors and genetic factors. Among the genetic factors, gene mutation plays an important role in the occurrence of VSD. The study by Basson et al has demonstrated for the first time that TBX mutations is associated with the development of hereditary CHD. Subsequently, some gene mutations, including NOTCH, CITED, NDRG, etc. were found to be related to VSD.– Ji et al have reported that NOTCH rsG > A variant may affect the regulation of miR--p on the NOTCH gene, thereby influencing the susceptibility to VSD. The study by Zheng et al has found that functional changes caused by variants in the promoter region of the CITED gene may affect a set of downstream genes and pathways and eventually lead to VSD. Peng et al have revealed that the p.TM variant in NDRG is a pathogenic variant associated with the impaired proliferation of human cardiomyocytes and cell cycle arrest, which may be involved in the pathogenesis of VSD. Taken together, genetic factors are crucial in the occurrence of VSD. However, some genetic variants associated with VSD in the Chinese Tibetan population remain to be further identified. At present, there are few studies on molecular mechanisms of VSD in the high-altitude environment.

Introduction:
Congenital heart disease (CHD) refers to cardiovascular malformations caused by abnormal development of cardiac vessels during the fetal period, which is the most common congenital dysplasia and also the main cause of non-infectious death in newborns and infants. CHD includes atrial septal defect (ASD), ventricular septal defect (VSD), pulmonary atresia (PA), patent ductus arteriosus (PDA), tetralogy of Fallot (TOF) and other cardiac malformations, among which the incidence of VSD is the highest, especially…

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