Natural History of Trisomy 8-Associated Autoinflammatory Disease (TRIAD) and Related Disorders

Study Description:

This is a natural history protocol designed to characterize the clinical spectrum of trisomy 8 mosaicism and trisomy 8-associated autoinflammatory disease (TRIAD) and related autoinflammatory disorders and further evaluate approaches to screening, diagnosis, and management. We will enroll affected patients and their unaffected relatives and collect a variety of clinical data and biological specimens for research analyses to better understand disease mechanisms. Biological samples from affected participants may include biopsies from the oral mucosa, skin, and bone marrow; swabs of the mouth, skin, and vagina; urine, stool, and saliva collections; and hair and fingernail clippings. Other clinical data may include imaging studies (such as magnetic resonance imaging [MRI], x-rays, and echocardiogram), questionnaires, and results from medical consults and clinically indicated procedures. Biological samples from unaffected relatives of participants may include blood, mouth swabs, stool, urine, and saliva. Participants may be seen in person or remotely via telehealth and provide send-in samples. After the initial baseline assessment, optional follow-up visits will occur approximately every 1 to 2 years, depending on the scientific needs of the study team and the participant s clinical status and interest.

Objectives:

Primary Objectives:

1. Characterize the clinical spectrum and natural history of trisomy 8 mosaicism and related disorders.
2. Characterize the immunologic profile in blood, tissue, and bone marrow of participants with trisomy 8 mosaicism and related disorders.

Secondary Objectives:

1. Determine appropriate screening and diagnostic workup of individuals with trisomy 8 mosaicism and related disorders.
2. Identify the long-term risk of and association with neoplasm among individuals with trisomy 8 mosaicism.
3. Characterize the distribution of trisomy 8 cells in different tissues and cell types and describe how this contributes to disease manifestations and variability.
4. Evaluate or characterize immune responses to targeted therapeutics to better understand the pathophysiology of trisomy 8 mosaicism and related disorders.

Exploratory Objectives:

1. Identify the specific genes and immunologic pathways that lead to disease manifestations seen in patients with trisomy 8.
2. Identify new genetic diseases that lead to mucosal ulcers and understand the immunologic mechanisms that contribute to mucosal ulcerations.

Endpoints:

Primary Endpoints:

1. Clinical characterization of participants with trisomy 8 mosaicism and related disorders based on history, physical examination, radiologic imaging, and laboratory testing.
2. Characterization of immunologic profile of participants with trisomy 8 mosaicism and related disorders over time in comparison to healthy controls using cellular and molecular techniques including, but not limited to immune cell phenotyping, transcriptomics, proteomics, and ex vivo functional studies.

Secondary Endpoints:

1. Characterization of laboratory, radiologic, biopsy, and physical exam findings.
2. Identification of individuals with trisomy 8 who develop malignancy and assessment of risk factors including but not limited to history, findings on bone marrow biopsies and complete blood counts (CBCs), next-generation sequencing (NGS) for risk variants, and flow cytometry.
3. Determination of the percentage of trisomy 8 cells in various tissue types including bone marrow, blood, fibroblasts cultured from skin, and biopsy samples, and the association with clinical phenotype.
4. Assessment of immune response to therapeutics based on inflammatory markers, clinical history, and physical exam findings.

Exploratory Endpoint:

1. Identification of genes that may lead to mucosal ulcerative disease when mutated or over/underexpressed.