Past Issue

Volume 21, Number 1, Apr-Jun(Spring) 2019 , Serial Number: 81 Pages: 78-85

Comparison of miRNA Profiles of Cord Blood Stem Cells in Identical and Fraternal Twins

Monireh Ajami, M.Sc, 1, Mohammad Hadi Sadeghian, M.D, 1, 2, *, Masoud Soleimani, Ph.D, 3, *, Mohammad Reza Keramati, M.D., 1, 2, Mansoureh Ajami, M.Sc., 3, Azadeh Anbarlou, M.Sc., 4, Amir Atashi, Ph.D., 5,
Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Cancer Molecular Pathology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Hematology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Department of Tissue Engineering, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Stem Cell and Tissue Engineering Research Center, Shahroud University of Medical Sciences, Shahroud, Iran
*Corresponding Addresses: P.O.Box: 9176759416 Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran P.O.Box: 14115-331 Department of Hematology Faculty of Medical Sciences Tarbiat Modares University Tehran Iran,



The role of epigenetic in regulating of the gene expression profile the embryo has been documented. MicroRNAs (miRNAs) are one of these epigenetic mechanisms. Twins are valuable models in determining the relative contributions of genetics and the environment. In this study, we compared differences in the expression levels of 44 miRNAs in hematopoietic stem cells (HSCs) of identical twins to that of fraternal twins as a controls.

Materials and Methods

In this experimental study, CD133+ HSCs were isolated from cord blood of identical and fraternal twins via magnetic-activated cell sorting (MACS). Variation in of gene expression levels of 44 miRNAs were evaluated using quantitative reverse transcription-polymerase chain reaction (qRT-PCR).


Significant differences in expression were observed in both fraternal and identical twins to varying degrees, but variations alteration in expression of the miRNAs were higher in fraternal twins.


Identical twins had a positive correlation in miRNA expression, while the correlation was not statistically significant in fraternal twins. Altogether, more differences in miRNA expression level in fraternal twins can be attributed to the both genetics and the intrauterine environment. The contribution of the intrauterine environment and genetics to miRNAs expression in HSCs was estimated 8 and 92%, respectively. By comparing of miRNA expression in identical and fraternal twins and identification of their target genes and biological pathways, it could be possible to estimate the effects of genetics and the environment on a number of biological pathways.