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ACE gene sequence and nucleotide variants in IgA nephropathy.
1Department of Renal Medicine, Singapore General Hospital, Outram Road, Singapore 169608. woo.keng.thye@sgh.com.sg
Genetic variations in the angiotensin-converting enzyme (ACE) gene influence IgA nephropathy (IgAN) progression and response to treatment. Specific ACE gene alleles and haplotypes are linked to adverse or protective renal outcomes.
Area of Science:
- Genetics
- Nephrology
- Pharmacogenomics
Background:
- Single nucleotide polymorphism (SNP) association studies for IgA nephropathy (IgAN) have yielded contradictory results.
- Haplotypes, derived from gene sequencing, may offer improved insights into genetic associations.
- The angiotensin-converting enzyme (ACE) gene is a key target for understanding IgAN pathogenesis and treatment response.
Purpose of the Study:
- To investigate genetic variations within the ACE gene in Chinese subjects with IgA nephropathy (IgAN).
- To explore the association between ACE gene polymorphisms and haplotypes with IgAN.
- To determine if ACE gene profiles predict renal outcomes in IgAN patients treated with ACE inhibitors/angiotensin receptor antagonists (ACEI/ATRA).
Main Methods:
- Sequencing of the ACE gene in healthy Chinese individuals and IgAN patients.
- Comparison of SNP and haplotype frequencies between patient groups and healthy controls.
- Analysis of renal outcomes in IgAN patients based on ACEI/ATRA therapy and genetic profiles, including progression to end-stage renal failure (ESRF).
Main Results:
- IgAN patients exhibited a higher number of unique variants in the ACE gene compared to healthy subjects.
- No single unique variant was identified as a significant risk factor for IgAN.
- Significant differences in genotype and allele frequencies were found between IgAN patients with renal impairment and those with ESRF.
Conclusions:
- Haplotype analysis of the ACE gene did not offer significant advantages over individual SNP genotyping for IgAN.
- The D allele and haplotype 3 of the ACE gene are associated with an adverse prognosis in IgAN.
- The I allele and haplotype 5 appear renoprotective, and ACE genotypes linked to specific haplotypes may influence treatment response in IgAN patients.
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