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[A molecular epidemiological study of childhood lead poisoning in lead-polluted environment]
Yuxin Zheng1, Shuguang Leng, Wenjia Song
1Institute of Occupational Health and Poisoning Control, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Insights
Genetic variations in ALAD and VDR genes influence lead poisoning susceptibility and developmental outcomes in children. ALAD gene polymorphism affects blood lead levels, while VDR gene variants impact skull development in lead-exposed children.
Area of Science:
- Environmental Health
- Genetics
- Pediatrics
Context:
- Children are particularly vulnerable to lead poisoning due to ongoing development.
- High lead exposure environments pose significant health risks to pediatric populations.
- Genetic factors can influence individual susceptibility to environmental toxins.
Purpose:
- To investigate the association between ALAD (aminolevulinate dehydratase) and VDR (Vitamin D Receptor) gene polymorphisms and lead poisoning susceptibility in children.
- To determine if these gene variations modify the impact of lead exposure on health and development.
- To identify potential inherited factors influencing lead toxicity in children.
Summary:
- This study analyzed 469 children for blood lead levels, ZPP (zinc protoporphyrin), hemoglobin, and physical development. ALAD and VDR gene polymorphisms were assessed using PCR-RFLP.
- Results indicated that ALAD2 allele carriers had higher ZPP levels, suggesting altered heme synthesis. VDR gene B allele carriers exhibited larger head circumferences, indicating an influence on skull development.
- The ALAD gene polymorphism modulated the relationship between blood lead and ZPP, while VDR gene variants affected skull development in lead-polluted environments.
Impact:
- Findings suggest ALAD and VDR gene polymorphisms are molecular inherited factors that modify lead poisoning susceptibility in children.
- This research highlights the importance of considering genetic predispositions in pediatric lead exposure assessments.
- Understanding these genetic influences can aid in developing targeted interventions and preventative strategies for lead-exposed children.
Objective:
The relationship between polymorphisms of ALAD and VDR genes and individual susceptibility of lead poisoning was investigated in children highly-exposed to lead.
Method:
Four hundred and sixty-nine children were recruited into this study and the blood lead, ZPP, hemoglobin as well as three physical developmental indexes (head circumference, height and weight) were measured. VDR and ALAD gene polymorphisms were analyzed by the methods of PCR-RFLP.
Results:
The subjects with ALAD2 allele had higher ZPP level (10.12 micro mol/L vs 12.87 micro mol/L) (P = 0.017). The subjects with B allele has larger head circumference than only with b allele (51.19 cm vs 50.75 cm) (P = 0.028).
Conclusions:
It was suggested that the ALAD gene polymorphism modified the relationship between blood lead and ZPP and the VDR gene variants influenced the skull development in children living under lead-polluted environment. The polymorphism of ALAD and VDR genes might serve as the molecular inherited factors modifying the susceptibility of lead poisoning.