Abstract:
:Pelger-Huët anomaly (PHA; OMIM *169400) is an autosomal dominant disorder characterized by abnormal nuclear shape and chromatin organization in blood granulocytes. Affected individuals show hypolobulated neutrophil nuclei with coarse chromatin. Presumed homozygous individuals have ovoid neutrophil nuclei, as well as varying degrees of developmental delay, epilepsy and skeletal abnormalities. Homozygous offspring in an extinct rabbit lineage showed severe chondrodystrophy, developmental anomalies and increased pre- and postnatal mortality. Here we show, by carrying out a genome-wide linkage scan, that PHA is linked to chromosome 1q41-43. We identified four splice-site, two frameshift and two nonsense mutations in LBR, encoding the lamin B receptor. The lamin B receptor (LBR), a member of the sterol reductase family, is evolutionarily conserved and integral to the inner nuclear membrane; it targets heterochromatin and lamins to the nuclear membrane. Lymphoblastoid cells from heterozygous individuals affected with PHA show reduced expression of the lamin B receptor, and cells homozygous with respect to PHA contain only trace amounts of it. We found that expression of the lamin B receptor affects neutrophil nuclear shape and chromatin distribution in a dose-dependent manner. Our findings have implications for understanding nuclear envelope-heterochromatin interactions, the pathogenesis of Pelger-like conditions in leukemia, infection and toxic drug reactions, and the evolution of neutrophil nuclear shape.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Hoffmann K,Dreger CK,Olins AL,Olins DE,Shultz LD,Lucke B,Karl H,Kaps R,Müller D,Vayá A,Aznar J,Ware RE,Sotelo Cruz N,Lindner TH,Herrmann H,Reis A,Sperling Kdoi
10.1038/ng925keywords:
subject
Has Abstractpub_date
2002-08-01 00:00:00pages
410-4issue
4eissn
1061-4036issn
1546-1718pii
ng925journal_volume
31pub_type
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