45,X mosaicism with Y chromosome presenting female phenotype

Genotype-phenotype correlation in 75 patients with small supernumerary marker chromosomes

Background

Small supernumerary marker chromosomes (sSMCs) are rare structural abnormalities in the population; however, they are frequently found in children or fetuses with hypoevolutism and infertile adults. sSMCs are usually observed first by karyotyping, and further analysis of their molecular origin is important in clinical practice. Next-generation sequencing (NGS) combined with Sanger sequencing helps to identify the chromosomal origins of sSMCs and correlate certain sSMCs with a specific clinical picture.

Results

Karyotyping identified 75 sSMCs in 74,266 samples (0.1% incidence). The chromosomal origins of 27 of these sSMCs were detected by sequencing-related techniques (NGS, MLPA and STR). Eight of these sSMCs are being reported for the first time. sSMCs mainly derived from chromosomal X, Y, 15, and 18, and some sSMC chromosomal origins could be correlated with clinical phenotypes. However, the chromosomal origins of the remaining 48 sSMC cases are unknown. Thus, we will develop a set of economical and efficient methods for clinical sSMC diagnosis.

Conclusions

This study details the comprehensive characterization of 27 sSMCs. Eight of these sSMCs are being reported here for the first time, providing additional information to sSMC research. Identifying sSMCs may reveal genotype-phenotype correlations and integrate genomic data into clinical care.

A de novo derivative Y chromosome (partial Yq deletion and partial duplication of Yp and Yq) in a female with disorders of sex development

We report an atypical disorders of sex development (DSD) case with no mutation of SYR gene but partial Yq deletion and partial duplication of Yp and Yq. This case emphasizes duplicated region Yp11.2→Yq11.223 with partial deletion of Yq11.223→Yqter most probably perturbed the sex differentiation and led to female phenotype.

Modified Exposure and Response Prevention for the Treatment of Comorbid OCD-Like Repetitive Behavior and Developmental Disability

Adults with developmental disabilities are particularly vulnerable to experiencing obsessive-compulsive disorder (OCD). However, the application of evidence-based treatments such as Exposure and Response Prevention (ERP) to individuals with comorbid OCD and developmental disabilities is a relatively new and emerging field of study. The present article presents a case study of modified ERP for the treatment of an adult woman with comorbid OCD-like repetitive behavior and developmental disabilities. Target behaviors, including OCD-like repetitive behavior, verbal agitation, and physical aggression, decreased over the course of the 7-month active treatment phase, and reductions in physical aggression and verbal agitation were maintained during follow-up. This case study provides important lessons about the individual-level and systems-level assessment and treatment of comorbid OCD-like repetitive behavior and developmental disabilities.