Abstract:
BACKGROUND:Disruption of granulocyte/macrophage colony-stimulating factor (GM-CSF) signalling causes pulmonary alveolar proteinosis (PAP). Rarely, genetic defects in neonatal or infant-onset PAP have been identified in CSF2RA. However, no report has clearly identified any function-associated genetic defect in CSF2RB. METHODS AND RESULTS:The patient was diagnosed with PAP at the age of 36 and developed respiratory failure. She was negative for GM-CSF autoantibody and had no underlying disease. Signalling and genetic defects in GM-CSF receptor were screened. GM-CSF-stimulated STAT5 phosphorylation was not observed and GM-CSF-Rβc expression was defective in the patient's blood cells. Genetic screening revealed a homozygous, single-base deletion at nt 631 in exon 6 of CSF2RB on chromosome 22, which caused reductions in GM-CSF dependent signalling and function. Both parents, who were second cousins, showed no pulmonary symptoms, and had normal GM-CSF-signalling, but had a CSF2RB allele with the identical deletion, indicating that the mutant allele may give rise to PAP in an autosomal recessive manner. CONCLUSIONS:This is the first report identifying a genetic defect in CSF2RB that causes deficiency of GM-CSF-Rβc expression and impaired signalling downstream. These results suggested that GM-CSF signalling was compensated by other signalling pathways, leading to adult-onset PAP.
journal_name
J Med Genetjournal_title
Journal of medical geneticsauthors
Tanaka T,Motoi N,Tsuchihashi Y,Tazawa R,Kaneko C,Nei T,Yamamoto T,Hayashi T,Tagawa T,Nagayasu T,Kuribayashi F,Ariyoshi K,Nakata K,Morimoto Kdoi
10.1136/jmg.2010.082586subject
Has Abstractpub_date
2011-03-01 00:00:00pages
205-9issue
3eissn
0022-2593issn
1468-6244pii
jmg.2010.082586journal_volume
48pub_type
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