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The nature of the wild-type gene product at the mouse ichthyosis ( ic ) locus has been of great interest because mutations at this locus cause marked abnormalities in nuclear heterochromatin, similar to those observed in Pelger–Huët anomaly (PHA). We recently found that human PHA is caused by mutations in the gene ( LBR ) encoding lamin B receptor, an evolutionarily conserved inner nuclear membrane protein involved in nuclear assembly and chromatin binding. Mice homozygous for deleterious alleles at the ichthyosis ( ic ) locus present with a blood phenotype similar to PHA, and develop other phenotypic abnormalities, including alopecia, variable expression of syndactyly and hydrocephalus. The  ic  locus on mouse chromosome 1 shares conserved synteny with the chromosomal location of the human  LBR  locus on human chromosome 1. In this study, we identified one nonsense (815ins) and two frameshift mutations (1088insCC and 1884insGGAA) within the  Lbr  gene of mice homozygous for either of three independent mutations ( ic ,  ic   J   and  ic  4 J  , respectively) at the ichthyosis locus. These allelic mutations are predicted to result in truncated or severely impaired LBR protein. Our studies of mice homozygous for the  ic   J   mutation revealed a complete loss of LBR protein as shown by immunofluorescence microscopy and immunoblotting. The findings provide the molecular basis for the heterochromatin clumping and other distinct phenotypes caused by  ic  mutations. These spontaneous  Lbr  mutations confirm the molecular basis of human PHA and provide a small animal model for determination of the precise function of LBR in normal and pathological states.

Mutations at the mouse ichthyosis locus are within the lamin B receptor gene: a single gene model for human Pelger–Huët anomaly