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A family study of protracted diarrhoea in infancy
Insights
This family study investigated undiagnosed protracted diarrhea in infants. Severe cases suggest potential autosomal recessive conditions, possibly inborn metabolic errors, requiring further research.
Area of Science:
- Pediatric Gastroenterology
- Clinical Genetics
- Human Genetics
Background:
- Protracted diarrhea in infancy is a significant clinical challenge.
- Identifying underlying causes is crucial for effective management and genetic counseling.
- Previous studies have explored various etiologies, but undiagnosed cases remain a concern.
Purpose of the Study:
- To investigate the familial occurrence and potential genetic basis of undiagnosed protracted diarrhea in infancy.
- To differentiate between severe and milder forms of the condition within affected families.
- To explore possible inheritance patterns and underlying defects.
Main Methods:
- A family study design was employed, focusing on 67 infants with undiagnosed protracted diarrhea.
- Patients with known causes (e.g., celiac disease, cow's milk intolerance, infections) were excluded.
- Family tracing and home visits were conducted to assess affected siblings and family history.
Main Results:
- The study identified heterogeneity within the cohort, with 5 cases associated with syndromes.
- Of the remaining 62 index patients, 15 had severe illness and 47 had milder illness.
- Severe cases showed a higher familial recurrence rate, with 6 affected siblings out of 22, suggesting a potential autosomal recessive inheritance pattern for this subgroup.
Conclusions:
- The severe form of undiagnosed protracted diarrhea in infancy may represent one or more autosomal recessive disorders.
- The underlying defects are likely inborn metabolic errors, though currently unknown.
- Further research is warranted to elucidate the specific genetic defects and metabolic pathways involved.
Abstract:
A family study of undiagnosed protracted diarrhoea in infancy was undertaken, based on 67 such patients, seen at The Hospital for Sick Children, London, over a 6-year period. All were fully investigated with the exclusion of those with known cause, such as coeliac disease, cow's milk intolerance, or enteric infections. The families were traced and visited. The material is certainly heterogeneous. In the case of five patients the condition was associated with a syndrome. The remaining 62 index patients could be divided into a group of 15 with severe illness and 47 with a milder illness. Six had onset before one month of age, four died, and in five the diarrhoea lasted more than 12 months and the children persistently failed to thrive. These 15 severe cases had six affected sibs out of 22 (Weinberg proband method) and in all but one of these affected sibs the condition was also severe. Two further sibs had had protracted diarrhoea, but this had not been fully investigated. The 47 index patients with milder disease had 68 sibs of whom only one was affected (this boy was one of the severely affected index patients), and one other sib had protracted diarrhoea which was not fully investigated. It is proposed that the severe group includes one or more autosomal recessive entities, in which the basic defects are not yet known, but are likely to be inborn metabolic errors.