Nephronophthisis (NPH) is a chronic tubulointerstitial nephritis leading to
terminal renal insufficiency. The disease is heterogeneous, but usually th
e inheritance pattern is autosomal recessive. In 80% of cases, the disease
is caused by a homozygous deletion in NPHP1 gene in chromosome 2q13. Ulcera
tive colitis is an inflammatory bowel disease with chronic diarrhea, rectal
bleeding and characteristic histological findings. Its etiology is suggest
ed to be multifactorial, consisting of genetic susceptibility and unknown e
xogenous factors. We present two siblings with NPH and ulcerative colitis.
As NPH in this family is not linked to 2q13, this association may represent
a new, syndromic form of NPH.