Exome-Based Rare-Variant Analyses in CKD.

Area of Science:

• Genetics
• Nephrology
• Genomics

Background:

• Common genetic variants explain limited variance in renal function and chronic kidney disease (CKD).
• The role of rare genetic variants in CKD has not been systematically investigated.

Purpose of the Study:

• To systematically examine the contribution of rare genetic variants to CKD.
• To identify novel genes and genetic modifiers associated with diverse CKD subtypes.

Main Methods:

• Exome sequencing was performed on 3150 individuals with CKD and 9563 controls.
• Rare variant collapsing analyses were used to compare variant burden between cases and controls.
• Genetic modifier analysis was conducted among cases with APOL1 risk genotypes.

Main Results:

• Established monogenic CKD genes (PKD1, PKD2, COL4A5) were validated.
• Suggestive signals for novel candidate genes, including CPT2 and AHDC1, were identified.
• Rare variants contribute significantly to CKD etiology, necessitating larger cohort studies.

Conclusions:

• Rare-variant collapsing analyses are effective for validating known CKD genes and discovering novel disease-associated genes.
• The findings support larger-scale investigations into rare-variant contributions across major CKD categories.
• This study provides a foundation for understanding the genetic architecture of kidney diseases.