PAX2 and obesity due to melanocortin 4 receptor deficiency: Because the genotyping procedure demonstrated a heterozygous missense mutation in exon 3 of the PAX2 gene, the case was concluded as a PAX2-mutation-induced adult-onset oligomeganephronia and adaptive FSGS (FSGS7, OMIM: 616002), noting that severe obesity could contribute to the progression of kidney injury.