Ignite Creation Date:
2025-12-24 @ 5:12 PM
Ignite Modification Date:
2025-12-25 @ 2:50 PM
Study NCT ID:
NCT03097250
Status:
COMPLETED
Last Update Posted:
2018-10-19
First Post:
2017-03-22
Is NOT Gene Therapy:
False
Has Adverse Events:
False
Brief Title:
MRI Spectroscopy and Neuropsychological Functioning in Phenylketonuria
Sponsor:
Boston Children's Hospital
Organization:
Study Overview
Official Title:
MRI Spectroscopy and Neuropsychological Functioning in Phenylketonuria
Status:
COMPLETED
Status Verified Date:
2018-10
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
This is a study about the relationship of brain biomarkers with neuropsychological functioning in PKU. All participants will undergo MRI spectroscopy, will provide a blood specimen and will receive neuropsychological testing.
Detailed Description:
Despite newborn screening and early initiation of treatment, many adolescents and adults with PKU experience some degree of neuropsychological dysfunction or mood disturbances. Blood phenylalanine (Phe) levels and low levels of tyrosine (Tyr) only partially explain why some individuals with PKU have these difficulties and others do not. In this study, the investigators will use a new approach involving magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS) for measuring brain Phe (and other brain chemicals) in order to determine relationships between brain biomarkers and neuropsychological functioning and mood. Previously, brain Phe and Tyr could not be reliably measured by MRS methods, especially in concentrations likely to be found in individuals with treated PKU. This project will use an improved method for measuring brain Phe and Tyr. The investigators will use two-dimensional shift correlated magnetic resonance spectroscopy (COSY). COSY is a non-invasive method that allows for quantitative measurement of Phe, Tyr and other amino acids in the brain. This project has the potential to close one of the most important gaps in the knowledge of PKU, namely to define how PKU affects the brain. The aims of this study are to examine brain Phe and Tyr in individuals with PKU and in an age-matched healthy comparison group, and 2) determine the association of Phe and Tyr in distinct brain regions with measures of neuropsychological functioning and mood. Participants with PKU will receive 2 MRI scans with spectroscopy and the comparison group will receive 1 MRI scan with spectroscopy under fasting conditions. All participants will provide a blood specimen for blood amino acid determinations and will receive neuropsychological testing. The investigators will develop statistical models that can be applied in future studies to enhance understanding of PKU. This pilot study is important because it will provide evidence of the usefulness of COSY. COSY has the potential to explain individual differences in PKU, identify specific cognitive functions or mood disturbances related to high brain Phe or low brain Tyr, and offer an additional marker or endpoint for evaluating new treatments in clinical trials.
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?: