Meta-analysis and systematic review of ADGRL3 (LPHN3) polymorphisms in ADHD susceptibility

Area of Science:

• Neurogenetics
• Psychiatric Genetics
• Molecular Psychiatry

Background:

• The ADGRL3 gene, encoding latrophilin 3, has been implicated in ADHD susceptibility.
• Previous studies suggest a potential genetic link between ADGRL3 polymorphisms and ADHD.
• Understanding the role of ADGRL3 in neurodevelopmental disorders like ADHD is crucial.

Purpose of the Study:

• To systematically review and meta-analyze the association between common ADGRL3 polymorphisms and ADHD.
• To investigate the association in both childhood and adult ADHD populations.
• To incorporate GWAS data for a comprehensive analysis of ADGRL3's role in ADHD.

Main Methods:

• Systematic review and meta-analysis of eight association studies (including GWAS data).
• Analysis focused on ADGRL3 polymorphisms: rs6551665, rs1947274, rs1947275, and rs2345039.
• Stratified analysis for childhood and adulthood ADHD cases and controls.

Main Results:

• Significant associations were found between ADGRL3 variants and childhood ADHD susceptibility (e.g., rs6551665 A allele, P=0.0069; rs2345039 C allele, P=0.0026).
• No significant associations were observed for ADGRL3 variants in adult ADHD populations.
• Heterogeneity was noted in childhood analyses for three SNPs, and in adult analyses for one SNP; no publication bias was detected.

Conclusions:

• ADGRL3 gene variants are predominantly associated with childhood ADHD susceptibility.
• The findings support ADGRL3's role in early neurodevelopmental processes relevant to ADHD.
• Further research is warranted to elucidate the specific mechanisms underlying ADGRL3's influence on ADHD.