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Cleft Lip/Palate

Congenital cleft lip and cleft palate are common in A strain mice and may be accompanied by premature eyelid opening in that strain. A/WySn mice are particu­larly prone to this disorder.

These malformations appear to be genetically complex in inheritance, but A/WySn mice have an IAP retrotransposon integration in the region of Wnt9b that is suspected to be a major determi­nant of susceptibility. Cleft palates are often blamed for mortality among mutant mice derived from chemical mutagenesis, transgenesis, and targeted mutagenesis. Because these lesions are obvious, they tend to be

FIG. 1.116. Periodontal inflammation associated with impaction of hair shafts in the gingival sulci. Inflammation often extends into the adjacent structures of the head.

blamed for other causes of embryonic and postnatal mortality.

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Source: Barthold Stephen W., Griffey Stephen M., Percy Dean H.. Pathology of Laboratory Rodents and Rabbits. 4th Edition. — Wiley-Blackwell,2016. — 384 p.. 2016
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