MGI:2449316Homozygotes for one knock-out allele show normal myonuclear positioning of both synaptic and non-synaptic nuclei in skeletal muscle cells. Homozygotes for another knock-out allele exhibit a thickened epidermis and altered nuclear envelope architecture inprimary dermal fibroblasts and keratinocytes. Mice homozygous for spontaneous mutations exhibit early retinal defects in photoreceptors, secondary neurons, and muller glia.