Human ring chromosomes (RCs) are rare diseases with an estimated newborn incidence of
1/50,000 and an annual occurrence of 2,800 patients globally. Over the past 60 years …

Ring chromosome 20 [r (20)] syndrome is a rare condition characterized by a non-
supernumerary ring chromosome 20 replacing a normal chromosome 20. It is commonly …

Constitutional ring chromosomes can be found for all human chromosomes and are very
rare chromosomal abnormalities. A complete ring chromosome without loss of genetic …

Ring chromosome 20 syndrome is a rare chromosomal disorder characterized by childhood-
onset drug-resistant epilepsy, behavioral problems and variable cognitive impairment. While …

We describe the cytogenomic and clinical characteristics of 47 individuals of ring
chromosome 4 (RC4) published in the literature. In nine cases, mosaicism for a normal cell …

Human ring chromosomes (RCs) are rare diseases with an estimated newborn incidence of
1/50,000 and an annual occurrence of 2,800 patients globally. Over the past 60 years …

This study was conducted in the Institute of Genetic Engineering and Biotechnology,
University of Baghdad, Baghdad, Iraq using 21oligozoospermic patients and 21 apparently …

Abstract Background and Aim: Ring chromosomes are rare cytogenetic abnormalities that
occur in less than 10% of hematopoietic malignancies. They are rare in blood disorder. The …