Clinical trial NCT00916903: Genetic Disease Gene Identification
Official title: Genetic Disease Gene Identification
Study type: OBSERVATIONAL
Overall status: TERMINATED
Conditions: Congenital Vertical Talus
Familial Encephalopathy With Neuroserpin Inclusion Bodies
Idiopathic Generalised Epilepsy
Familial Dementia
X-linked Mental Retardation
Keywords: Talus
Neuroserpin
mental retardation
epilepsy
FENIB
XLMR
Lead sponsor: State University of New York - Upstate Medical University
Sponsor class: OTHER
First posted: 2009-06-10
Enrollment: 176
Sex: ALL
Minimum age (years): 6
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: FAMILY_BASED
Time perspective: RETROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients and their families identified by physicians.

Brief summary: This is a a study to identify inherited disease genes. The study will use molecular techniques to map genetic diseases using techniques such as Affymetrix SNP chips. The powerful combination of the information generated by the Human Genome Project and technical advances such as microarrays enables attempts to identify genes responsible for inherited disorders more possible than ever before. Starting with even modest pedigrees of only a few individuals, or even single individuals, it is possible to identify the gene(s) involved. It is proposed to collect up to 20 ml of peripheral blood and/or buccal cell samples from subjects and relevant family members. Currently the following disorders are approved for investigation.

The current list of disorders:

Aarskog-Scott syndrome, Café-au-Lait spots, Cerebral cavernous malformation, delXp, del2q, del10p, del11q, del12p, del13q, del14q, del16q, del17q, del18q, del Xp21, Choreoathetosis, Congenital Vertical Talus (CVT), Clubfoot, Tarsal coalition and other congenital limb deformities, Cystic Fibrosis (CF)-like disease, Desbuquois syndrome, Droopy Eyelid syndrome (Ptosis), Fanconi-Bickel syndrome (FBS), FENIB (familial encephalopathy with neuroserpin inclusion bodies), FG syndrome, Idiopathic generalised epilepsy (IGE), Renpenning syndrome, transient neonatal diabetes with 6q UPD, translocation (13;14), translocation (3;8), translocation (2;18), Uncharacterized familial dementia and X-linked mental retardation (XLMR).

Detailed description: It is proposed to identify and recruit individuals and/or families with specified the disorders listed above. 10-20 ml (2-4 teaspoons) of peripheral blood will be collect¬ed from all adult subjects. Smaller volumes of blood would be collected from children based on their age/size. In some cases, as an adequate alternative to collecting peripheral blood, buccal cells will be collected using cheek swabs (Epicentre Biotechnologies). All relevant living members of each pedigree will be asked to partici¬pate, free of charge, on a research basis only. Genomic DNA will be extracted by standard methods and used as template for Polymerase Chain Reac¬tion (PCR) amplification reactions. Individuals will be genotyped at markers and candidate gene sequenced.

Essentially two approaches will be used:

1. Circumstances that may provide knowledge of candidate genes include reviews of the literature, biology of the disease, understanding of biological pathways, chromosomal rearrangements, mutants in model organisms etc. When candidate genes exist, it is proposed to use linked microsatellite and/or single nucleotide polymorphism (SNP) PCR primer pairs on the DNA from families to determine if there is co-segregation of the disease and markers and thus linkage between the disease gene and previously mapped markers.

   If the disease appears to be linked to the candidate gene, PCR primers flanking all coding exons will be used to amplify the exons and intron/exon boundaries followed by sequencing to detect disease-causing mutations. A web site that enables the design of primers to amplify candidate gene exons is available (http://genome.ucsc.edu/cgi-bin/hgGateway ). If a very strong candidate gene exists, candidate gene sequencing will be performed on affected individual samples without first performing a linkage study.
2. When no obvious candidate genes exist, and a family of sufficient size has been collected, it is proposed to use Affymetrix SNP microarrays to perform a human genome-wide search for linkage. We have used this approach successfully before (Shrimpton et al 2004), utilizing the whole genome linkage analysis with the Human Mapping 10K Array (Affymetrix Inc., Santa Clara, CA). The 10K Array permits the simultaneous genotyping of more than 11,200 mapped SNPs spaced throughout the human genome at 210 KB intervals. Affymetrix 100K and 500K arrays are also available. SNP genotype information will be analyzed using Varia (Silicon Genetics) and/or Merlin software. The data will be used to define a critical region. If statistically significant segregation is detected, candidate genes within the critical region will be evaluated and ranked in order of their likelihood of being the disease gene. Candidate genes will then be sequenced as detailed above.

Summary.

1. Identify candidate disease genes from linkage studies, strong circumstantial evidence or clues from the phenotype.
2. Sequence candidate genes to detect disease-causing mutations.
3. Evaluation of detected variation.

Eligibility criteria: Inclusion Criteria:

* Patients and their families identified by physicians.

Exclusion Criteria:

* Patients with unrelated disorders.

Primary outcomes:
measure: Identification of gene/mutation responsible for disorder.
timeFrame: 1 year
Secondary outcomes:
Other outcomes:
Locations:
city: Syracuse
country: United States
facility: SUNY Upstate Medical University
state: New York
Study officials:
affiliation: State University of New York - Upstate Medical University
name: Antony E Shrimpton, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Shrimpton AE, Levinsohn EM, Yozawitz JM, Packard DS Jr, Cady RB, Middleton FA, Persico AM, Hootnick DR. A HOX gene mutation in a family with isolated congenital vertical talus and Charcot-Marie-Tooth disease. Am J Hum Genet. 2004 Jul;75(1):92-6. doi: 10.1086/422015. Epub 2004 May 14.
citation: Bradshaw CB, Davis RL, Shrimpton AE, Holohan PD, Rea CB, Fieglin D, Kent P, Collins GH. Cognitive deficits associated with a recently reported familial neurodegenerative disease: familial encephalopathy with neuroserpin inclusion bodies. Arch Neurol. 2001 Sep;58(9):1429-34. doi: 10.1001/archneur.58.9.1429.
citation: Hoo JJ, Shrimpton AE. Distal 3p deletion is not necessarily associated with dysmorphic features or psychomotor delay. Am J Med Genet A. 2008 Feb 15;146A(4):538. doi: 10.1002/ajmg.a.32158. No abstract available.
citation: Shrimpton AE, Jensen KA, Hoo JJ. Karyotype-phenotype analysis and molecular delineation of a 3p26 deletion/8q24.3 duplication case with a virtually normal phenotype and mild cognitive deficit. Am J Med Genet A. 2006 Feb 15;140(4):388-91. doi: 10.1002/ajmg.a.31066. No abstract available.
citation: Hoo JJ, Shrimpton AE. Familial hyper- and hypopigmentation with age-related pattern change. Am J Med Genet A. 2005 Jan 15;132A(2):215-8. doi: 10.1002/ajmg.a.30381. No abstract available.
citation: Shrimpton AE, Braddock BR, Thomson LL, Stein CK, Hoo JJ. Molecular delineation of deletions on 2q37.3 in three cases with an Albright hereditary osteodystrophy-like phenotype. Clin Genet. 2004 Dec;66(6):537-44. doi: 10.1111/j.1399-0004.2004.00363.x.
citation: Levinsohn EM, Shrimpton AE, Cady RB, Packard DS, Hootnick DR. Congenital vertical talus in four generations of the same family. Skeletal Radiol. 2004 Nov;33(11):649-54. doi: 10.1007/s00256-004-0851-1. Epub 2004 Sep 11.
citation: Davis RL, Shrimpton AE, Carrell RW, Lomas DA, Gerhard L, Baumann B, Lawrence DA, Yepes M, Kim TS, Ghetti B, Piccardo P, Takao M, Lacbawan F, Muenke M, Sifers RN, Bradshaw CB, Kent PF, Collins GH, Larocca D, Holohan PD. Association between conformational mutations in neuroserpin and onset and severity of dementia. Lancet. 2002 Jun 29;359(9325):2242-7. doi: 10.1016/S0140-6736(02)09293-0.
citation: LaDine BJ, Simmons JA, Shrimpton AE, Hoo JJ. Syndrome of short stature, widow's peak, ptosis, posteriorly angulated ears, and joint problems: exclusion of the Aarskog (FGD1) gene as a candidate gene. Am J Med Genet. 2001 Mar 15;99(3):248-51. doi: 10.1002/1096-8628(2001)9999:99993.0.co;2-t.
citation: Shrimpton AE, Braddock BR, Hoo JJ. Narrowing the map of a gene (MRXS9) for X-linked mental retardation, microcephaly, and variably short stature at Xq12-q21.31. Am J Med Genet. 2000 May 15;92(2):155-6. No abstract available.
citation: Davis RL, Shrimpton AE, Holohan PD, Bradshaw C, Feiglin D, Collins GH, Sonderegger P, Kinter J, Becker LM, Lacbawan F, Krasnewich D, Muenke M, Lawrence DA, Yerby MS, Shaw CM, Gooptu B, Elliott PR, Finch JT, Carrell RW, Lomas DA. Familial dementia caused by polymerization of mutant neuroserpin. Nature. 1999 Sep 23;401(6751):376-9. doi: 10.1038/43894.
citation: Shrimpton AE, Daly KM, Hoo JJ. Mapping of a gene (MRXS9) for X-linked mental retardation, microcephaly, and variably short stature to Xq12-q21.31. Am J Med Genet. 1999 May 28;84(3):293-9.
citation: Davis RL, Holohan PD, Shrimpton AE, Tatum AH, Daucher J, Collins GH, Todd R, Bradshaw C, Kent P, Feiglin D, Rosenbaum A, Yerby MS, Shaw CM, Lacbawan F, Lawrence DA. Familial encephalopathy with neuroserpin inclusion bodies. Am J Pathol. 1999 Dec;155(6):1901-13. doi: 10.1016/S0002-9440(10)65510-1.