Mitochondria are present in all human cells and vary in number from a few tens to many thousands. As they generate the majority of a cell's energy supply which power every part of our body, and hence, their number varies in different cells as per the energy requirement of the cell. Mitochondria have their own separate DNA, which carries total 13 genes. All of these 13 genes are involved in energy production. For normal functioning of cells, the mitochondria need to be healthy. Unhealthy mitochondria can cause severe medical disorders known as mitochondrial disease. In case of mitochondrial disease, the most commonly affected organs are the heart, kidney, skeletal muscle, and brain. The diseases related to defects in these organs are quite prevalent in the society. Majority of these mitochondrial diseases are caused by genetic defects (mutations) in the mitochondrial DNA. Unlike nuclear genes, mitochondrial DNA is inherited only from our mother. Mothers can carry abnormal mitochondria and be at risk of passing on the serious disease to their children, even if they themselves show only mild or no symptoms. Due to the complex nature of these diseases, their diagnosis and therapy are very difficult. Hence, till now, only the different methods for management of these diseases are known. However, after understanding the complexity related to the cure of these diseases, alternative methods have been developed to minimize/stop the transfer of mitochondrial diseases from mother to offspring. This latest technique is called mitochondrial replacement or “donation.” In the present review, we are discussing the methodological details and issues related to the technique of mitochondrial donation. Our study is also a step toward raising awareness about mitochondrial diseases and advocating for the legalization of mitochondrial donation, a revolutionary in vitro fertilization technique.
Objective: Polymorphisms in vitamin D receptor (VDR) genes are known to be linked with different metabolic diseases including Type 2 diabetes mellitus (T2DM) also. However, the association of these polymorphisms is not much explored for the Indian population. To determine the prevalence of BsmI and TaqI polymorphism in VDR gene of T2DM patients from North India.Methods: Blood samples were obtained from 100 well-characterized T2DM patients and 100 healthy controls. Genomic DNA was isolated from blood samples and using polymerase chain reaction/restriction fragment length polymorphism based method, the presence of these polymorphisms was investigated in these samples. The data were statistically analyzed using SPSS 21.0 software. Results:For TaqI polymorphism, both the wild type (TT) and heterozygous (TC) genotype showed a significant difference between patients and controls (p=0.023 and p<0.001, respectively). Whereas, the frequency of CC genotype was not significantly different among these groups (p=0.506). For BsmI polymorphism also, the frequency of wild type (GG) and heterozygous (GA) genotype was significantly different in patients and controls (p=0.027 and p=0.001), respectively. However, the frequency of AA genotype was not of statistical significance in patients (p=0.071). Conclusions:The mutant alleles of TaqI and BsmI polymorphisms are known to be associated with different metabolic diseases, including diabetes too. In our study also, there is a significant difference between the frequency of wild type and heterozygous genotype for these polymorphisms. This suggests that BsmI and TaqI polymorphisms may be associated with T2DM patients.
Objective: Vitamin D receptor (VDR) mediated Vitamin D signaling is important for expression of insulin gene and glucose transporters, which help in glucose uptake by cells. Current evidence suggests that four common polymorphisms (FokI, BsmI, ApaI, TaqI) of VDR gene are associated with Type 2 diabetes mellitus (T2DM) in different populations. However, there is a scarcity of data on VDR polymorphisms from Indian population.Methods: In the current study, total genomic DNA was isolated from 100 well-characterized T2DM patients and 100 healthy controls. We investigated the prevalence of FokI and ApaI polymorphisms in VDR gene of these patients by polymerase chain reaction-restriction fragment length polymorphismbased method. Taking help of our previous published data on TaqI and BsmI polymorphisms in same patients, the haplotype study was also conducted. Statistical analysis of data was performed using SPSS 21.0 software. Haplotype and linkage disequilibrium analysis was performed by Haploview software.Results: Both the wild (TT) and mutant (CC) genotype of FokI polymorphism showed a significant difference between patients and controls (p<0.001 and p<0.001, respectively). The frequency of mutant allele (C) was also significantly higher in T2DM patients than the controls (p<0.001). In case of ApaI, frequency of wild (GG) and mutant (CC) genotype was significantly different in patients and controls (p=0.017 and p=0.034). As per haplotype analysis, the CACT haplotype was predicted to be of significance in patients and consists of mutant alleles of three polymorphisms (FokI, BsmI, ApaI). Conclusion:Our study supports the association of FokI and ApaI polymorphism in T2DM. The haplotype analysis also indicates that the combinations of mutant allele of different VDR polymorphisms are probably responsible for increased susceptibility of these individuals toward T2DM.
These identified proteins may provide information about disease pathophysiology and can serve as potential targets for therapeutic intervention of T2D. Further studies on the changes of protein expression under high glucose concentration and supplementation with vitamin D will lead to better understanding of the molecular mechanisms of T2D.
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