An intragenic deletion of the gene MNAT1 in a family with pectus deformities

MAT1 correlates with molecular subtypes and predicts poor survival in breast cancer

Objective

Menage a trois 1 (MAT1) is a targeting subunit of cyclin-dependent kinase-activating kinase and general transcription factor IIH kinase, which modulates cell cycle, transcription and DNA repair. Its dysregulation is responsible for diseases including cancers. To further explore the role of MAT1 in breast cancer, we investigated the pathways in which MAT1 might be involved, the association between MAT1 and molecular subtypes, and the role of MAT1 in clinical outcomes of breast cancer patients.

Methods

We conducted immunohistochemistry staining on tissue microarray and immunofluorescence staining on sections of MAT1 stable breast cancer cells. Also, we performed Kyoto Encyclopedia of Genes and Genomes pathway analysis, correlation analysis and prognosis analysis on public databases.

Results

MAT1 was involved in multiple pathways including normal physiology signaling and disease-related signaling. Furthermore, MAT1 positively correlated with the protein status of estrogen receptor and progesterone receptor, and was enriched in luminal-type and human epidermal growth factor receptor 2-enriched breast cancer in comparison with basal-like subtype at both mRNA and protein levels. Correlation analysis revealed significant association between MAT1 mRNA amount and epithelial markers, mesenchymal markers, cancer stem cell markers, apoptosis markers, transcription markers and oncogenes. Consistently, the results of immunofluorescence stain indicated that MAT1 overexpression enhanced the protein abundance of epidermal growth factor receptor, vimentin, sex determining region Y-box 2 and sine oculis homeobox homolog 1. Importantly, Kaplan-Meier Plotter analysis reflected that MAT1 could serve as a prognostic biomarker predicting worse relapse-free survival and metastasis-free survival.

Conclusions

MAT1 is correlated with molecular subtypes and is associated with unfavorable prognosis for breast cancer patients.

Pectus deformities and their impact on pulmonary physiology

Pectus excavatum (PE) and pectus carinatum (PC) are the most common anomalies of the thoracic cage and they have been recognized since ancient times [1-3]. The two conditions differ in their appearance, and their effect on lung function. There is no direct correlation between the appearance of the deformities and the clinical symptoms. Whether, and when these deformities should be corrected as well as with which method (surgical or conservative) remain controversial. The following article reviews the current concepts regarding the pathophysiology of both conditions as well as the advances in their evaluation and management.