Classification, Functional Stratification and Biomarkers in Ciliopathy (CILLICORIRCM)

Assistance Publique - Hôpitaux de Paris

Status: Enrolling

Conditions: Bardet-Biedl Syndrome; Senior-Loken Syndrome; Jeune Syndrome; Nephronophthisis; Ciliopathies; Joubert Syndrome

Treatments: Other: Urine sample; Other: Blood sample

Study type: Interventional

Funder types: Other

Identifiers

NCT04874909

APHP200896

ID-RCB Number (Other Identifier)

Details and patient eligibility

About

The purpose of the C'IL-LICO RICM study is to develop innovative and transformative diagnostic and prognostic for patients suffering from ciliopathies leading to renal failure.

The objectives is to decipher disease mechanisms and highlight signaling pathways altered in at-risk to develop renal failure patient groups and to produce a prognostic biomarker-based kit to predict the evolution of ciliopathy patients towards renal impairment.

Full description

Ciliopathies are a large group of rare and severe genetic diseases caused by ciliary dysfunction, in which nearly all organs can be affected. In spite of being individually rare, they affect collectively up to one per 2000 people. Over the past two decades, more than 90 genes have been reported as mutated in ciliopathy patients. Most proteins encoded by these genes play key roles in the biogenesis or function of cilia, in which they define different functional subdomains. Genetic analyses of ciliopathies revealed a vast clinical variability and a broad genetic heterogeneity as: 1) mutations of the same disease-causing gene can result in distinct clinical entities and, conversely, 2) mutations in several independent genes can lead to similar clinical features, implying both phenotypic and genetic overlaps. The extent and severity of organ involvement may be correlated in part with the nature or location of the mutational event, the cell/tissue specific expression and effect of the mutated protein on cilia dysfunction.

Renal involvement is one of the most frequent manifestations in ciliopathies, and it leads to excessive morbidity and mortality. This includes renal cystic dysplasia (RCD), a kidney developmental defect, and nephronophthisis (NPHP), a chronic tubulointerstitial nephritis, both disorders representing frequent causes of end-stage renal disease (ESRD) during childhood to early adulthood. This makes ESRD a terminal endpoint of either isolated or syndromic ciliopathies, with, hitherto, no available curative treatment of chronic kidney disease whatsoever. The only bearable option is renal transplantation. As the average life-span of a functioning kidney transplant is about 10-15 years, it is urgent to identify therapeutic solutions that slow down progression of CKD in ciliopathies, and delay or avoid dialysis or transplantation. Today, the diagnosis of ciliopathies is first based on primary clinical manifestations, and then confirmed by gene mutation identification. However, even in patients with identified causative mutations, it is impossible to predict the severity of the disease, the risk of appearance (if not present at diagnosis), and/or the rate of progression of CKD. Thus, a crucial issue in the field of ciliopathies is to be able to perform early detection of at-risk patients prior to development of CKD as well as to predict disease progression rate.

Enrollment: 240 estimated patients

Sex: All

Volunteers: No Healthy Volunteers

Inclusion and exclusion criteria

Inclusion Criteria:

"Case" Patient :

• with nephronophthisis or ciliopathy with known genetic diagnosis or not
• signed the Informed consent form (patient or legal guardians if minor/incapable major)
• no limit of age, this patients could be recruited from the birth
• social insurance affiliation

Healthy related individual :

• related with a included patient (father, mother, brother, sister)
• signed the Informed consent form (major or legal guardians if minor/incapable major)
• no limit of age, this patients could be recruited from the birth
• social insurance affiliation

"Negative Control" patient :

• without chronic renal failure
• signed the Informed consent form (major or legal guardians if minor/incapable major)
• no limit of age, this patients could be recruited from the birth
• social insurance affiliation

"Positive Control" patient :

• with chronic renal failure not related with a ciliary dysfunction
• signed the Informed consent form (major or legal guardians if minor/incapable major)
• no limit of age, this patients could be recruited from the birth
• social insurance affiliation

Exclusion Criteria "Case" Patient :

• pregnant, parturious and nursing mothers.
• with functional renal graft
• use an experimental treatment during 30 days before inclusion date

Healthy related individual :

• pregnant, parturious and nursing mothers.

"Negative Control" patient :

• pregnant, parturious and nursing mothers.

"Positive Control" patient :

• pregnant, parturious and nursing mothers.
• with functional renal graft
• use an experimental treatment during 30 days before inclusion date

Trial design

Primary purpose: Diagnostic

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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240 participants in 4 patient groups

"Case" Patient

Other group

Description:

Patient with ciliopathy

Treatment:

Other: Blood sample

Other: Urine sample

Healthy related individual

Other group

Description:

Individual without ciliopathy but related to a patient with ciliopathy (father, mother, brother, sister)

Treatment:

Other: Blood sample

Other: Urine sample

"Negative Control" patient

Other group

Description:

patient without renal disease

Treatment:

Other: Blood sample

Other: Urine sample

"Positive Control" patient

Other group

Description:

patient with renal disease other that ciliopathy but with a similar renal function to the ciliopathy group ("case" patient)

Treatment:

Other: Blood sample

Other: Urine sample