Related Experiment Video
Updated: Jan 31, 2026

15:16
Loading Drosophila Nerve Terminals with Calcium Indicators
Published on: July 30, 2007
10.5K
Early Indicators of Creatine Transporter Deficiency
Judith S Miller1, Rebecca P Thomas2, Amanda Bennett2
1Center for Autism Research, The Children's Hospital of Philadelphia, Philadelphia, PA; Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.
The Journal of Pediatrics
|December 24, 2018
Summary
Early identification of creatine transporter deficiency is crucial for treatment. Many infants show feeding issues and delayed motor skills before age one, suggesting a need for urine screening.
Area of Science:
- Biochemistry
- Pediatric Neurology
Background:
- Creatine transporter deficiency (CTD) is a rare genetic disorder.
- Early identification of CTD is essential for timely intervention and management.
- Current diagnostic approaches may not capture all affected individuals early on.
Purpose of the Study:
- To highlight the importance of early identification of creatine transporter deficiency.
- To identify key early developmental indicators in infants with CTD.
- To propose improved screening strategies for CTD.
Main Methods:
- Retrospective analysis of clinical data from infants diagnosed with CTD.
- Evaluation of developmental milestones and feeding patterns in the first year of life.
- Correlation of early signs with diagnostic confirmation.
Main Results:
- Half of the studied infants exhibited significant feeding or weight gain problems before their first birthday.
- Delayed sitting or crawling was observed in 50% of infants before age one.
- The combination of feeding issues and delayed motor skills presented as potential early warning signs.
Conclusions:
- Feeding difficulties and delayed motor development are significant early indicators of CTD.
- These combined early signs could prompt healthcare providers to consider urine screening for CTD.
- Implementing screening based on these indicators may improve early diagnosis and treatment initiation for CTD.
Related Concept Videos
Indicators
60.7K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
60.7K
Facilitated Transport
148.0K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
148.0K
Primary Active Transport
198.3K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
198.3K
Secondary Active Transport
137.8K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
137.8K
Regulated mRNA Transport
7.0K
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
7.0K
Phloem and Sugar Transport
40.0K
Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.
40.0K

