Related Experiment Videos
Behaviour in early treated phenylketonuria: a systematic review
1Phenylketonuria Register, Division of Biochemistry and Metabolism, University College, London, UK. SmithI@gosh-tr.nthames.nhs.uk
Insights
Early treated phenylketonuria (PKU) patients exhibit distinct behavioral patterns compared to peers. These differences, including anxiety and depression, may stem from dietary interventions and neurobiological factors.
Area of Science:
- Neuroscience
- Behavioral Science
- Genetics
Background:
- Phenylketonuria (PKU) is a genetic disorder requiring early dietary intervention.
- Understanding the long-term behavioral impact of PKU management is crucial.
Purpose of the Study:
- To systematically review the literature on behavioral differences in early-treated PKU patients.
- To identify patterns, real-life implications, and contributing factors to behavioral issues in PKU.
Main Methods:
- Systematic literature review of 34 publications.
- Focused analysis on 11 reports from four studies with >20 subjects.
- Examined behavioral differences, patterns, and correlations with intellectual status, phenylalanine control, and social factors.
Main Results:
- Early-treated PKU patients show significant behavioral differences from the general population.
- Consistent patterns observed include higher emotional/neurotic scores and lower anti-social/aggressive scores.
- Associated factors include attention deficit hyperactivity disorder, lower IQ, and poorer phenylalanine control.
Conclusions:
- Behavioral problems in PKU are likely multifactorial.
- Both the stress of dietary management and potential neurobiological impairments contribute.
- Further research is needed to definitively establish causality.
Unlabelled:
A search was made of the literature on behaviour in early treated phenylketonuria (PKU). Some 34 publications were selected for systematic review in order to answer the following questions: (1) does behaviour in early treated subjects with PKU differ from that in the general population?, (2) if so, do the differences show any consistent pattern?, matter in real life?, relate to intellectual status, phenylalanine (Phe) control or social factors? and (3) can behavioural problems be precipitated or reversed by changes in Phe control?. Eleven reports based on four studies of > 20 subjects provided the most useful data. There was good evidence of differences between subjects with PKU and their unaffected peers in behaviour and perception of self. The pattern of results was consistent across nations and age groups (higher scores on emotional/neurotic items and lower scores on anti-social/aggressive items) and suggested that subjects with PKU are more prone to depression, anxiety, phobic tendencies, isolation from their peers and a less "masculine" self image. Features of attention deficit hyperactivity disorder and associations between behaviour problems and both lower IQ and a worse quality of Phe control were well documented in several studies.
Conclusion:
The literature did not allow for definite conclusions on the cause of the behavioural problems but, taken together, the findings suggest that both the stressful dietary intervention and a degree of neurobiological impairment are likely to play a part.