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Growth and developmental patterns in Prader-Willi syndrome
1Division of Child Neurology, Tottori University School of Medicine, Yonago, Japan.
Insights
This study on Prader-Willi syndrome in Japanese infants reveals initial growth retardation and developmental delays. However, hyperphagia later leads to significant weight gain, impacting overall development.
Area of Science:
- Pediatrics
- Genetics
- Developmental Biology
Background:
- Prader-Willi syndrome (PWS) is a complex genetic disorder affecting growth and development.
- Early identification and understanding of PWS manifestations are crucial for intervention.
Purpose of the Study:
- To investigate the growth patterns and developmental milestones of Japanese patients with Prader-Willi syndrome from infancy.
- To correlate chromosomal aberrations with clinical phenotypes in PWS patients.
Main Methods:
- Longitudinal study of 11 Japanese infants diagnosed with Prader-Willi syndrome.
- High-resolution chromosome banding technique to identify chromosomal aberrations.
- Assessment of growth parameters (birth weight, weight gain, height increase) and developmental milestones (developmental quotient).
Main Results:
- 40% of patients exhibited chromosomal aberrations.
- 10 out of 11 patients had below-average birth weight, with severe growth retardation by 6 months.
- Transient height and weight retardation occurred between 10-18 months, followed by rapid weight gain due to hyperphagia.
- Mean developmental quotient was 50, indicating significant developmental delays, irrespective of chromosomal aberration status.
Conclusions:
- Prader-Willi syndrome presents with initial growth failure and developmental delays in infancy.
- Hyperphagia is a key factor in later rapid weight gain.
- Chromosomal aberrations did not significantly influence developmental milestones in this cohort.
Abstract:
Eleven Japanese patients with Prader-Willi syndrome were studied from infancy, and examined with respect to their growth and development. The chromosomal aberration was observed in 40% of the patients using a high-resolution chromosome banding technique. The birth weight in 10 out of the 11 patients was below the mean and the rate of body weight gain was severely retarded by 6 months in all cases, which suggested an insufficient utilization of nutrients in uterine life and in early infancy. The rate of height increase as well as that of body weight increase were also transiently retarded from 10 to 18 months of age in eight cases, and the body weight gain increased dramatically after 10-18 months due to hyperphagia. The patients' mean milestones of development were delayed (the mean developmental quotient was 50) in comparison with those of control patients; there was no difference between the developmental milestones of the two groups with and without the chromosomal aberration.