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Learn MoreThe physiological functions of the HAT/DESC sub-family of membrane-anchored serine proteases are poorly defined. The high sequence homology, overlapping pattern of expression, and tight clustering of their corresponding genes have complicated the functional analysis of HAT/DESC proteases by conventional loss-of-function genetics. Here, we exploited the extraordinary efficiency of CRISPR-mediated gene targeting to generate 18 unique congenic mouse strains lacking combinations of HAT/DESC proteases, including a mouse strain deficient in all seven proteases. Surprisingly, mice lacking all HAT/DESC proteases developed to term, were healthy and fertile, and displayed only a modest impairment of epidermal barrier function, as recently described for mice with single deficiency in HAT-like 4. This function of HAT-like 4 in epidermal barrier formation was unique among HAT/DESC proteases. Thus, mice lacking all HAT/DESC proteases displayed transepidermal water loss rates similar to mice lacking only HAT-like 4, and, conversely, mice lacking all HAT/DESC proteases, except HAT-like 4, displayed transepidermal water loss rates identical to wildtype mice. The study yields new insights into the function of HAT/DESC proteases and provides multiple new mouse strains valuable for functional studies of this enigmatic protease sub-family in physiological and in pathophysiological processes. SOURCE: Roman Szabo (rszabo@nidcr.nih.gov) - Proteases and Tissue Remodeling Section National Institute of Dental and Craniofacial Research
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