Clinical trial NCT00113464: Developing Newborn Screening for Infants With Primary Immunodeficiency
Official title: Developing Newborn Screening for Infants With Primary Immunodeficiency
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Immune System Diseases
Keywords: SCID (Severe Combined Immunodeficiency)
TREC (T cell Receptor Excision Circle)
Bone Marrow Transplant
Dried Blood Spots
Early Detection
T Cell Immunodeficiency Diseases
Immunodeficiency Diseases
Primary Immunodeficiency
T Cell Immunodeficiency Disease
Severe Combined Immunodeficiency
SCID
Lead sponsor: National Institutes of Health Clinical Center (CC)
Sponsor class: NIH
First posted: 2005-06-08
Enrollment: 100
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no

Brief summary: This study will explore screening for immunodeficiency diseases (diseases that cause problems in fighting infections). There is no method at present to screen all babies at birth for immunodeficiency. However, babies with low numbers of T-cells-an important type of immune system cell-may be found by studying T-cell products called TRECs (T-cell receptor excision circles). This study will:

* Collect samples from children with several different immunodeficiencies to find out which disorders can be found by screening dried blood spots for TRECs.
* Try to develop screening tests based on other kinds of material derived from dried blood spots.

Children with primary immunodeficiency and low numbers of T cells who have not had a bone marrow transplant may be eligible for this study.

Participating children donate up to 5 ml (1 teaspoon) of blood. The sample may be collected when the child is having other blood tests. The liquid blood is analyzed to determine the number of T cells, and the rest of the blood is used to make dried blood spots on filter paper. The blood spots are used to develop screening tests for immunodeficiency. The blood spots and data about the child's age, diagnosis, and current medicines will be kept coded by diagnosis and a code number instead of the child's name.

Detailed description: Study Objective: T cell receptor excision circles (TRECs) are episomal DNA circles excised from the T cell receptor genes during T cell maturation in the thymus. They do not replicate, so they are diluted out as T cells proliferate. Our objectives are to examine the levels of TRECs in blood samples from patients with primary immunodeficiency (PI) diseases; to determine which PI diseases might be detected by testing newborn dried blood spots for low numbers of TRECs; and to use the blood spots collected for future confirmatory or alternative tests to develop newborn screening for PIs.

Population: Patients diagnosed with defined primary T cell immunodeficiency diseases or undefined conditions with very low T cell numbers. There are several known, and additional unknown, gene defects that impair T lymphocyte maturation and function. The frequency of these rare disorders is unknown, but could potentially be learned in the course of population-based newborn screening.

Design: We will contact our network of immunology colleagues to help us identify and enroll patients already diagnosed with PI disorders. These patients will have had HIV ruled out as part of their immune evaluation. We will provide mail-in kits and will receive blood samples for analysis. We will attempt to retrieve the actual Guthrie cards containing the dried blood spots of these patients from their state screening laboratories to determine the number of TRECs that were present at birth in infants with these conditions.

Outcome Measures: We will measure TRECs in dried blood spots, and correlate TREC number with diagnosis and clinical and laboratory data. We hope to determine the range of immunodeficiency diseases that can be demonstrated to have significantly reduced TRECs as compared to healthy subjects using our assay. Because TREC testing may be insufficiently sensitive or specific as a stand-alone test, further tests may be developed and performed on the samples in the future, including DNA re-sequencing, detection of mRNA for T cell specific genes and/or proteins expressed only in T cells.

Eligibility criteria: * INCLUSION CRITERIA:

Patient who has not yet received a BMT and who has defined PI or undefined PI with T cell lymphopenia.

EXCLUSION CRITERIA:

None.

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: New Haven
country: United States
facility: Yale University
state: Connecticut
Study officials:
References:
citation: Barrett DJ, Ammann AJ, Wara DW, Cowan MJ, Fisher TJ, Stiehm ER. Clinical and immunologic spectrum of the DiGeorge syndrome. J Clin Lab Immunol. 1981 Jul;6(1):1-6.