micrornas (mirnas) are non-coding small rna molecules with 21–25 nucleotides. it plays significant role in control of gene expression at posttranscriptional/translational level. they are commonly dysregulated in human cancers, whereas they may behave either as oncogenes or as tumor-suppressor genes. both genetic and epigenetic events in deregulation of mirna can lead to cancer development. gene...

introduction: mental retardation, is one of the most common causes for referral to genetic counseling centers, and is one of the greatest challenges in health care services in the world. down syndrome is the most common chromosomal abnormalities in humans. methods: this study performed in medical genetic counseling center of welfare organization in south of iran with high consanguineous marriag...

Genetic mutations in exons of oncogenes and tumor-suppressor genes causing qualitative abnormalities result in activation of the oncogenes and inactivation of the tumor-suppressor genes, thereby causing cancer. In contrast, we have previously demonstrated that decreases in the RB promoter activity by genetic or epigenetic abnormalities can also cause carcinogenesis. In addition, activation and ...

background: the infertility is an important health problem, affecting about 15% of couples. the important role of genetic factors in pathogenesis of infertility is now increasingly recognized. the value of karyotyping women in the routine work-out of couples referred for sterility has long been recommended. objective: the aim of this study was to define the frequency of all chromosomal aberrati...

background:   objective: the objective of the present study was to evaluate the application of two dimensional ultrasound (2-dus) and real time three dimensional ultrasound (3-dus) in differentiating various type of septated uterus. hysteroscopy confirmation was assigned as the gold standard.   materials and methods: this retrospective study was performed among 215 infertile women with suspecte...

BACKGROUND Malignant transformation requires the accumulation of multiple genetic alterations such as chromosomal abnormalities, oncogene activation, loss of tumor suppressor genes, or abnormalities in genes that control DNA repair and genomic instability. Sarcomas are a heterogeneous group of malignant mesenchymal tumors of difficult histologic classification and strong genetic predisposition....