Connexin 26 Testing in Infants
Principal Investigator: Christina Palmer
Abstract: The incorporation of genetic information into the early hearing detection and intervention (EHDI) process has the potential to dramatically improve the process by providing information regarding appropriate protocols for case management and differential diagnosis, prognosis for rehabilitation and by providing more complete information for families regarding etiology and recurrence risk. However, before genetic testing should be applied universally, it is important to understand when to introduce such testing and counseling into the process and these decisions should be based on scientific study and data. Relative to other events in the EHDl process, the time at which the family is approached regarding testing and the provision of information will influence parental interest in genetic testing, parental understanding of information provided, and the anxiety associated with the information. Further, before Cx26 genetic testing is applied universally, it is important to understand how the limitations of genetic testing at a single locus for a heterogeneous condition influences parental understanding, anxiety, and perceived personal control. Only through prospective, longitudinal research designs will data bearing on these important issues be available. The accuracy and completeness of information regarding prognosis relative to genetic disposition is linked to the amount of carefully controlled phenotype investigations. At present, a lack of large-scale studies of the hearing and related characteristics (phenotype) of infants and children with accurate genotypic information have denied the hearing health community with a complete picture of the infant with biallelic Cx26 mutations. This study employs a prospective, longitudinal design to compare the efficacy of introducing genetic counseling and testing at two stages in the EHDI process, one after failure on inpatient screening but before final diagnosis (pre-diagnosis) and the other following audiologic diagnosis of hearing loss (post-diagnosis). A large cohort of predominantly hearing parents will be followed for up to 6 months to fully evaluate the educational and psychological outcomes of genetic testing and counseling. A large cohort of infants and toddlers will be followed for up to three years to fully evaluate the audiologic phenotype of infants and data will be compared based on Cx26 genotype.
Funding Period: 2002-09-23 - 2007-08-31
more information: NIH RePORT
- Factors influencing parental decision about genetics evaluation for their deaf or hard-of-hearing childChristina G S Palmer
Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, California, USA
Genet Med 11:248-55. 2009..To identify factors that are associated with why parents of deaf children who have had GJB2/GJB6 testing as part of a genetics research study do or do not take their children for genetics evaluation...
- Prelingual siblings of children with GJB2 hearing loss: issues to considerChristina G S Palmer
Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, UCLA Neuropsychiatric Institute, 90095, USA
Arch Otolaryngol Head Neck Surg 131:1020-2. 2005
- Sharing GJB2/GJB6 genetic test information with family membersTerri Blase
Department of Biology, California State University Northridge, Northridge, CA, USA
J Genet Couns 16:313-24. 2007..Differences suggest that hearing loss may have unique attributes that influence responses to genetic test information. Further research is needed to replicate these findings...
- Ethnic differences in parental perceptions of genetic testing for deaf infantsChristina G S Palmer
Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA 90024, USA
J Genet Couns 17:129-38. 2008..Understanding different perspectives on genetic testing for deafness will enhance genetic counselors' cultural competence and facilitate the pre-test genetic counseling session...
- A prospective, longitudinal study of the impact of GJB2/GJB6 genetic testing on the beliefs and attitudes of parents of deaf and hard-of-hearing infantsChristina G S Palmer
Department of Psychiatry and Biobehavioral Sciences, UCLA, Los Angeles, CA 90095, USA
Am J Med Genet A 149:1169-82. 2009....