Primary ciliary dyskinesia(PCD)is a highly heterogeneous recessive inherited disorder.FAP54,the homolog of CFAP54 in Chlamydomonas reinhardtii,was previously demonstrated as the C1d projection of the central microtubu...Primary ciliary dyskinesia(PCD)is a highly heterogeneous recessive inherited disorder.FAP54,the homolog of CFAP54 in Chlamydomonas reinhardtii,was previously demonstrated as the C1d projection of the central microtubule apparatus of flagella.A Cfap54 knockout mouse model was then reported to have PCD-relevant phenotypes.Through whole-exome sequencing,compound heterozygous variants c.2649_2657delinC(p.E883Dfs*47)and c.7312_7313insCGCAGGCTGAATTCTTGG(p.T2438delinsTQAEFLA)in a new suspected PCD-relevant gene,CFAP54,were identified in an individual with PCD.Two missense variants,c.4112A>C(p.E1371A)and c.6559C>T(p.P2187S),in CFAP54 were detected in another unrelated patient.In this study,a minigene assay was conducted on the frameshift mutation showing a reduction in mRNA expression.In addition,a CFAP54 in-frame variant knock-in mouse model was established,which recapitulated the typical symptoms of PCD,including hydrocephalus,infertility,and mucus accumulation in nasal sinuses.Correspondingly,two missense variants were deleterious,with a dramatic reduction in mRNA abundance from bronchial tissue and sperm.The identification of PCD-causing variants of CFAP54 in two unrelated patients with PCD for the first time provides strong supportive evidence that CFAP54 is a new PCD-causing gene.This study further helps expand the disease-associated gene spectrum and improve genetic testing for PCD diagnosis in the future.展开更多
基金supported by the National Key Research and Development Program of China(No.2016YFC0901502 to Kai-Feng Xu,No.2016YFC0905100 to Xue Zhang,No.2017YFC1001201 to Yaping Liu)the National Natural Science Foundation of China(NSFC)(No.81788101 to Xue Zhang,No.31271345 to Yaping Liu)the CAMS Initiative for Medical Sciences(CIFMS)(Nos.2021-1-I2M-018 and 2016-I2M-1-002 to Xue Zhang and Yaping Liu,Nos.2020-I2M-C&T-B-002 and 2018-I2M-1-003 to Xinlun Tian).
文摘Primary ciliary dyskinesia(PCD)is a highly heterogeneous recessive inherited disorder.FAP54,the homolog of CFAP54 in Chlamydomonas reinhardtii,was previously demonstrated as the C1d projection of the central microtubule apparatus of flagella.A Cfap54 knockout mouse model was then reported to have PCD-relevant phenotypes.Through whole-exome sequencing,compound heterozygous variants c.2649_2657delinC(p.E883Dfs*47)and c.7312_7313insCGCAGGCTGAATTCTTGG(p.T2438delinsTQAEFLA)in a new suspected PCD-relevant gene,CFAP54,were identified in an individual with PCD.Two missense variants,c.4112A>C(p.E1371A)and c.6559C>T(p.P2187S),in CFAP54 were detected in another unrelated patient.In this study,a minigene assay was conducted on the frameshift mutation showing a reduction in mRNA expression.In addition,a CFAP54 in-frame variant knock-in mouse model was established,which recapitulated the typical symptoms of PCD,including hydrocephalus,infertility,and mucus accumulation in nasal sinuses.Correspondingly,two missense variants were deleterious,with a dramatic reduction in mRNA abundance from bronchial tissue and sperm.The identification of PCD-causing variants of CFAP54 in two unrelated patients with PCD for the first time provides strong supportive evidence that CFAP54 is a new PCD-causing gene.This study further helps expand the disease-associated gene spectrum and improve genetic testing for PCD diagnosis in the future.
