Id |
Subject |
Object |
Predicate |
Lexical cue |
T1 |
0-100 |
Sentence |
denotes |
Hypomorphic mutations in meckelin (MKS3/TMEM67) cause nephronophthisis with liver fibrosis (NPHP11). |
T2 |
101-112 |
Sentence |
denotes |
BACKGROUND: |
T3 |
113-267 |
Sentence |
denotes |
Nephronophthisis (NPHP), a rare recessive cystic kidney disease, is the most frequent genetic cause of chronic renal failure in children and young adults. |
T4 |
268-323 |
Sentence |
denotes |
Mutations in nine genes (NPHP1-9) have been identified. |
T5 |
324-471 |
Sentence |
denotes |
NPHP can be associated with retinal degeneration (Senior-Løken syndrome), brainstem and cerebellar anomalies (Joubert syndrome), or liver fibrosis. |
T6 |
472-480 |
Sentence |
denotes |
METHODS: |
T7 |
481-727 |
Sentence |
denotes |
To identify a causative gene for the subset of patients with associated liver fibrosis, the authors performed a genome wide linkage search in a consanguineous family with three affected patients using 50K SNP microarrays and homozygosity mapping. |
T8 |
728-736 |
Sentence |
denotes |
RESULTS: |
T9 |
737-927 |
Sentence |
denotes |
The authors obtained a significant maximum parametric LOD (logarithm of odds) score of Z(max) = 3.72 on chromosome 8q22 and identified a homozygous missense mutation in the gene MKS3/TMEM67. |
T10 |
928-1132 |
Sentence |
denotes |
When examining a worldwide cohort of 62 independent patients with NPHP and associated liver fibrosis we identified altogether four novel mutations (p.W290L, p.C615R, p.G821S, and p.G821R) in five of them. |
T11 |
1133-1288 |
Sentence |
denotes |
Mutations of MKS3/TMEM67, found recently in Meckel-Gruber syndrome (MKS) type 3 and Joubert syndrome (JBTS) type 6, are predominantly truncating mutations. |
T12 |
1289-1417 |
Sentence |
denotes |
In contrast, the mutations detected here in patients with NPHP and associated liver fibrosis are exclusively missense mutations. |
T13 |
1418-1559 |
Sentence |
denotes |
This suggests that they may represent hypomorphic alleles, leading to a milder phenotype compared with the more severe MKS or JBTS phenotype. |
T14 |
1560-1758 |
Sentence |
denotes |
Additionally, mutation analysis for MKS3/TMEM67 in 120 patients with JBTS yielded seven different (four novel) mutations in five patients, four of whom also presented with congenital liver fibrosis. |
T15 |
1759-1771 |
Sentence |
denotes |
CONCLUSIONS: |
T16 |
1772-1846 |
Sentence |
denotes |
Hypomorphic MKS3/TMEM67 mutations cause NPHP with liver fibrosis (NPHP11). |
T17 |
1847-1958 |
Sentence |
denotes |
This is the first report of MKS3 mutations in patients with no vermian agenesis and without neurological signs. |
T18 |
1959-2012 |
Sentence |
denotes |
Thus NPHP, JBTS, and MKS represent allelic disorders. |