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Review
. 2020:1221:807-819.
doi: 10.1007/978-3-030-34521-1_35.

Heparanase 2 and Urofacial Syndrome, a Genetic Neuropathy

Neil A Roberts  1 , Adrian S Woolf  2   3
Affiliations
Review

Heparanase 2 and Urofacial Syndrome, a Genetic Neuropathy

Neil A Roberts et al. Adv Exp Med Biol. 2020.

Abstract

Urofacial syndrome (UFS) is a rare but potentially devastating autosomal recessive disease. It comprises both incomplete urinary bladder emptying and a facial grimace upon smiling. A subset of individuals with the disease has biallelic mutations of HPSE2, coding for heparanase-2. Heparanase-2 and the classical heparanase are both detected in nerves in the maturing bladder, and mice mutant for Hpse2 have UFS-like bladder voiding defects and abnormally patterned bladder nerves. Other evidence suggests that the heparanase axis plays several roles in the peripheral and central nervous systems, quite apart from UFS-related biology. Some individuals with UFS lack HPSE2 mutations and instead carry biallelic variants of LRIG2, encoding leucine-rich-repeats and immunoglobulin-like-domains 2. Like heparanase-2, LRIG2 is detected in bladder nerves, and mutant Lrig2 mice have urination defects and abnormal patterns of bladder nerves. Further work is now needed to define the precise roles of heparanase-2 and LRIG2 in normal and abnormal neural differentiation.

Keywords: Autonomic; Bladder; HPSE2; LRIG2; Nerve; Urinary; Voiding.

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