Comprehensive germline mutation analysis and clinical profile in a large cohort of Brazilian xeroderma pigmentosum patients

BACKGROUND

Xeroderma pigmentosum (XP) patients present a high risk of developing skin cancer and other complications at an early age. This disease is characterized by mutations in the genes related to the DNA repair system.

OBJECTIVES

To describe the clinical and molecular findings in a cohort of 32 Brazilian individuals who received a clinical diagnosis of XP.

METHODS

Twenty-seven families were screened for germline variants in eight XP-related genes.

RESULTS

All patients (N = 32) were diagnosed with bi-allelic germline pathogenic or potentially pathogenic variants, including nine variants previously undescribed. The c.2251-1G>C XPC pathogenic variant, reported as the founder mutation in Comorian and Pakistani patients, was observed in 15 cases in homozygous or compound heterozygous. Seven homozygous patients for POLH/XPV variants developed their symptoms by an average age of 7.7 years. ERCC2/XPD, DDB2/XPE and ERCC5/XPG variants were found in a few patients. Aside from melanoma and non-melanoma skin tumours, a set of patients developed skin sebaceous carcinoma, leiomyosarcoma, angiosarcoma, mucoepidermoid carcinoma, gastric adenocarcinoma and serous ovarian carcinoma.

CONCLUSIONS

We reported a high frequency of XPC variants in 32 XP Brazilian patients. Nine new variants in XP-related genes, unexpected non-skin cancer lesions and an anticipation of the clinical manifestation in POLH/XPV cases were also described.

A comparison of the prevalence of psychiatric disorders in Puerto Rico with the United States and the Puerto Rican population of the United States

PURPOSE

The manuscript compares the rates of psychiatric disorder among island Puerto Ricans, the US population and US Puerto Ricans in order to examine whether social support explains differences in psychiatric disorder among these three groups.

METHODS

Unadjusted and adjusted rates for sociodemographic factors and social support of main psychiatric disorders are compared among three population-based psychiatric epidemiology studies carried in Puerto Rico (PR) and the United States (US) as part of the NCS-R and NLAAS studies.

RESULTS

Comparison of adjusted rates showed island Puerto Ricans had similar overall rates of psychiatric disorder as those of the US, lower rates of anxiety disorders, but higher rates of substance use disorders. US Puerto Ricans had higher rates of adjusted anxiety and depression but not of overall psychiatric disorder, as compared to the island. When the rates of disorder were adjusted also for social support, the differences between these two groups disappeared.

CONCLUSIONS

The findings suggest that social support is a variable worthy of further exploration for explaining differences in disorder prevalence particularly among Puerto Ricans depending on where they live.