Worldwide perspective of IgA nephropathy

Area of Science:

• Nephrology
• Epidemiology
• Genetics

Background:

• IgA nephropathy (IgAN) is the most prevalent glomerular disease and a leading cause of end-stage renal failure.
• Epidemiologic data on IgAN prevalence is scarce globally, hindering its recognition as a public health issue.

Purpose of the Study:

• To investigate the geographic and ethnic variations in IgA nephropathy prevalence.
• To explore potential etiological factors, including infections and genetic predispositions.

Main Methods:

• Analysis of IgAN prevalence in kidney biopsy specimens across different populations.
• Review of existing literature on IgAN epidemiology and risk factors.

Main Results:

• IgAN shows significant geographic variation, with higher reported percentages in East Asian populations possibly due to systematic urine screening.
• IgAN is detected less frequently in Black populations, suggesting potential genetic influences.
• Antibiotic therapy for streptococcal infections has not impacted IgAN rates, questioning the role of infections in its etiology.

Conclusions:

• The etiology of IgAN is complex, likely involving a combination of environmental and genetic factors.
• Further innovative epidemiologic research is crucial to elucidate the multifactorial mechanisms underlying IgAN risk.
• Infections are unlikely to be the primary cause of IgAN, warranting a renewed focus on other causal agents.