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Early behavior signs of psychiatric phenotypes in fragile X syndrome
1Johns Hopkins University School of Medicine, USA. Kau@KennedyKrieger.org
Insights
Preschool boys with fragile X syndrome exhibit distinct behavioral patterns compared to those with idiopathic developmental delay. These differences in behavior, including motor skills and social withdrawal, aid in distinguishing fragile X syndrome.
Area of Science:
- Neurodevelopmental Disorders
- Behavioral Genetics
- Pediatric Psychology
Background:
- Fragile X syndrome (FXS) is a leading genetic cause of intellectual disability and autism spectrum disorder.
- Identifying specific behavioral phenotypes in young children with FXS is crucial for early diagnosis and intervention.
- Idiopathic developmental delay (IDD) presents a diagnostic challenge due to overlapping symptoms with genetic syndromes.
Purpose of the Study:
- To determine if preschool males with fragile X syndrome can be differentiated from males with idiopathic developmental delay based on key behavioral characteristics.
- To investigate the specific problem behavior areas associated with fragile X phenotypes in young children.
- To compare behavioral profiles between fragile X syndrome and age/IQ-matched controls.
Main Methods:
- Utilized a cohort of preschool males diagnosed with fragile X syndrome (n=41) and age- and IQ-matched controls with idiopathic developmental delay (n=16).
- Mothers rated participants using standardized instruments: Dimensions of Temperament Scale-Revised, Child Behavior Checklist, and Aberrant Behavior Checklist--Community.
- Statistical analyses were performed to compare behavioral measures between the fragile X and control groups.
Main Results:
- The fragile X group demonstrated significant deficits in motor skills, increased initial avoidance, decreased social withdrawal, and altered mood compared to controls.
- While hyperactivity and attention deficits were noted, they did not significantly distinguish the groups.
- After controlling for maternal characteristics, the fragile X group exhibited a significantly higher generalized activity level.
Conclusions:
- Specific behavioral and temperamental differences can help distinguish preschool males with fragile X syndrome from those with idiopathic developmental delay.
- Early identification of these behavioral markers is essential for targeted support and management of fragile X syndrome.
- Further research should explore the interplay of genetic factors and environmental influences on behavioral outcomes in fragile X syndrome.
Abstract:
Whether preschool males with fragile X syndrome can be distinguished from those with idiopathic developmental delay in the four problem behavior areas associated with the fragile X phenotypes was examined. Males with fragile X (n = 41) and age- and IQ-matched controls (n = 16) were rated by their mothers on the Dimensions of Temperament Scale-Revised, the Child Behavior Checklist, and the Aberrant Behavior Checklist--Community. The fragile X group showed deficits in motor skills, increased initial avoidance, decreased social withdrawal, deficits in attention, increased hyperactivity, and positive mood. They were distinguished from controls on all of these variables except hyperactivity and attention. When maternal characteristics were controlled for, the fragile X group showed a significantly higher level of generalized activity level than did controls.