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- W2131455138 abstract "Primary ciliary dyskinesia (PCD) is a genetically heterogeneous disorder caused by cilia and sperm dysmotility. About 12% of cases show perturbed 9+2 microtubule cilia structure and inner dynein arm (IDA) loss, historically termed “radial spoke defect.” We sequenced CCDC39 and CCDC40 in 54 “radial spoke defect” families, as these are the two genes identified so far to cause this defect. We discovered biallelic mutations in a remarkable 69% (37/54) of families, including identification of 25 (19 novel) mutant alleles (12 in CCDC39 and 13 in CCDC40). All the mutations were nonsense, splice, and frameshift predicting early protein truncation, which suggests this defect is caused by “null” alleles conferring complete protein loss. Most families (73%; 27/37) had homozygous mutations, including families from outbred populations. A major putative hotspot mutation was identified, CCDC40 c.248delC, as well as several other possible hotspot mutations. Together, these findings highlight the key role of CCDC39 and CCDC40 in PCD with axonemal disorganization and IDA loss, and these genes represent major candidates for genetic testing in families affected by this ciliary phenotype. We show that radial spoke structures are largely intact in these patients and propose this ciliary ultrastructural abnormality be referred to as “IDA and microtubular disorganisation defect,” rather than “radial spoke defect.”" @default.
- W2131455138 created "2016-06-24" @default.
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- W2131455138 date "2013-03-01" @default.
- W2131455138 modified "2023-10-18" @default.
- W2131455138 title "Mutations in<i>CCDC</i><i>39</i>and<i>CCDC</i><i>40</i>are the Major Cause of Primary Ciliary Dyskinesia with Axonemal Disorganization and Absent Inner Dynein Arms" @default.
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- W2131455138 doi "https://doi.org/10.1002/humu.22261" @default.
- W2131455138 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3630464" @default.