鎌状赤血球症および下肢潰瘍研究へのマイクロバイオームおよび環境の寄与に関する洞察 (INSIGHTS 研究)

Study Description:

Leg ulcers are a serious and debilitating complication of sickle cell disease (SCD). This study will explore microbial, genomic, and environmental (social and physical) factors, that may influence the onset and progression of leg ulcer formation and delayed healing in individuals living with SCD. The etiology of SCD-associated leg ulcers is unclear, and we hypothesize that predisposition to developing leg ulcers is multifactorial. This multisite study is an exploratory study of the microbiome and environment of individuals living with sickle cell disease leg ulcers. The study s objective is to identify triggers that may be integral in leg ulcer onset and progression. The central goal of this study is to obtain an improved understanding of the participants clinical phenotype, leg ulcer microbiome and the psychosocial and environmental factors that may impact this complication.

Objectives:

Primary Objective:

Employ genomic approaches to characterize the skin microbiome in individuals living with SCD with and without leg ulcers.

Secondary Objective:

1. Employ social science research measures to identify psychosocial and physical environmental factors that impact quality of life in individuals living with SCD with and without leg ulcers.
2. Develop new measure of severity for SCD that integrates clinical outcomes and the quality of life of the participant.
3. Develop guidelines for researchers to address the needs of diverse and under-resourced groups in genetic research.

Endpoints:

Primary Endpoint:

To characterize the microbiome of leg ulcers in SCD.

Secondary Endpoints:

1. To characterize the phenotypic variation in SCD.
2. To identify similarities and differences of the microbial signatures of chronic diabetic foot ulcers and SCD leg ulcers.
3. To investigate physical and psychosocial environmental indicators that impact quality of life in individuals living with SCD with and without leg ulcers.
4. To determine if an association exists between the microbiome (microbial diversity) of SCD leg ulcers and the quality of life (psychosocial and physical environment) indicators of individuals with SCD leg ulcers.
5. To determine if an association exists between the microbiome (microbial diversity) of SCD leg ulcers and clinical phenotype of individuals with SCD leg ulcers.
6. To determine how leg ulcers influence one s physical function and one s perceptions of stigma and self-esteem.
7. To identify factors that are indicators of both quality of life and clinical severity of the participant.
8. To identify specific psychosocial and environmental factors related to resilience in our study population.
9. To investigate current practices and policies around the return of secondary findings in genome sequencing studies in under-resourced study participant populations, and to explore ethical and clinical policies for returning secondary findings by examining various practices within the research community.
10. To investigate SCD variation in phenotype, microbiome, physical and psychosocial environments in a cohort in Sierra Leone.
11. To compare similarities and differences in phenotype, microbiome, physical and psychosocial environments between U.S. and Sierra Leone cohorts.