Study of Genotype and Phenotype Expression in Congenital Nephrogenic Diabetes Insipidus

Diabetes Insipidus, Nephrogenic Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00004360
• Other study ID #: 199/11929
• Secondary ID: NU-513
• Status: Completed
• Phase: N/A
• First received: October 18, 1999
• Last updated: June 23, 2005
• Start date: September 1995

Study information

• Verified date: December 1999
• Source: Office of Rare Diseases (ORD)
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Federal Government
• Study type: Observational

Clinical Trial Summary

OBJECTIVES:

I. Determine the relationship between genotype variations and clinical phenotype in patients with congenital nephrogenic diabetes insipidus.

Description:

PROTOCOL OUTLINE: A detailed family history is obtained from all participants. Whenever possible, standard growth curves of affected children are obtained.

Participants then undergo clinical studies of antidiuretic function. A standard fluid deprivation-vasopressin challenge is performed with timed measurements of osmolality, electrolytes, creatinine, and vasopressin. The next day, blood pressure, plasma cyclic AMP, GMP, von Willebrand Factor, Factor VIII, and urine osmolality are measured during a water load desamino-D-arginine vasopressin (dDAVP) infusion test.

Participants with a confirmed diagnosis of congenital diabetes insipidus are then treated with chlorothiazide. Daily urine volume and osmolality are determined before and after therapy. Sodium and fluid are not restricted.

For each family, the entire vasopressin V2 gene of at least 1 affected male, and where possible at least 1 obligate carrier and 1 unaffected brother of a patient is sequenced. In addition, a detailed Xq28 haplotype analysis is done to identify the origin of de novo mutations. If no mutation is found and the disorder is not transmitted in an X-linked mode, both alleles of the gene that codes for aquaporin-II are also sequenced. DNA is collected by mail from as many kindred as possible who do not participate in the clinical studies.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 0
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 6 Months to 70 Years

Eligibility

PROTOCOL ENTRY CRITERIA:

• Known or suspected congenital nephrogenic diabetes insipidus

• Clinically and genetically unaffected relatives entered as controls

--Patient Characteristics--

• Age: 6 months to 70 years

Study Design

Primary Purpose: Screening

Related Conditions & MeSH terms

• Diabetes Insipidus
• Diabetes Insipidus, Nephrogenic

Intervention

Drug:
• chlorothiazide

Locations

Country	Name	City	State
n/a

Sponsors (2)

Lead Sponsor	Collaborator
National Center for Research Resources (NCRR)	Northwestern University

References & Publications (4)

Bichet DG, Birnbaumer M, Lonergan M, Arthus MF, Rosenthal W, Goodyer P, Nivet H, Benoit S, Giampietro P, Simonetti S, et al. Nature and recurrence of AVPR2 mutations in X-linked nephrogenic diabetes insipidus. Am J Hum Genet. 1994 Aug;55(2):278-86. — View Citation

Robertson GL, McLeod JF, Zerbe RL, et al.: Vasopressin function in heritable forms of diabetes insipidus. In: Gross P, Richter D, Robertson GL, eds.: Vasopressin: IV International Vasopressin Conference, May 23-27, 1993, Berlin Germany. Paris: John Libbey Eurotext, 1993, pp 493-503.

Sadeghi H, Robertson GL, Bichet DG, Innamorati G, Birnbaumer M. Biochemical basis of partial nephrogenic diabetes insipidus phenotypes. Mol Endocrinol. 1997 Nov;11(12):1806-13. — View Citation

Wenkert D, Merendino JJ Jr, Shenker A, Thambi N, Robertson GL, Moses AM, Spiegel AM. Novel mutations in the V2 vasopressin receptor gene of patients with X-linked nephrogenic diabetes insipidus. Hum Mol Genet. 1994 Aug;3(8):1429-30. — View Citation