Dr. Pao-Lin Kuo (Department of Obstetrics and Gynecology)
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Enrollment
- 60
- Locations
- 1
- Primary Endpoint
- M-PCR(methylation-specific PCR)
Study Overview
Brief Summary
In a retrospective study, data were assessed from cases regarding PWS/AS that underwent molecular diagnosis at the National Chen-Kung University Hospital, Tainan, Taiwan, between January 2001 and December 2014.
Detailed Description
Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are two distinct syndromes of developmental impairment that result from loss of the expression of imprinted genes on the q11-q13 region of chromosome 15 (15q11-q13). Approximately 70%--75% of individuals affected with PWS and AS have an interstitial deletion of 15q11-q13. Regarding the remaining individuals with PWS, maternal uniparental disomy is the cause in 20% of cases, imprinting errors in 3% of cases, and chromosomal translocation in approximately 1% of cases. Regarding the remaining cases of AS, paternal uniparental disomy accounts for 2% of cases and mutations in the UBE3A gene for 20% of cases.The PWS/AS critical region was examined by fluorescence in situ hybridization (FISH), methylation-specific PCR (M-PCR), and methylation-specific multiplex-ligation dependent probe amplification(MS-MLPA). In a retrospective study at the National Chen-Kung University Hospital,Tainan, Taiwan, data were reviewed from cases that were referred for molecular diagnosis between January 1, 2001, and December 31, 2014.
Study Design
- Study Type
- Observational
- Observational Model
- Cohort
- Time Perspective
- Retrospective
Eligibility Criteria
- Ages
- — to 45 Years (Child, Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Individual with clinical features related to Prader-Willi syndrome or Angelman syndrome;
- •Fetus with suspicious deletion or duplication of chromosome 15q11.2-q13 visible by the microscope;
- •Fetus whose mother or father has chromosomal abnormality involving 15q11.2-q13
- •Fetus with mosaic trisomy 15
Exclusion Criteria
- Not provided
Outcomes
Primary Outcomes
M-PCR(methylation-specific PCR)
Time Frame: up to 4 weeks after diagnosis
Abnormal pattern of M-PCR can identify PWS or AS
FISH(fluorescent in-situ hybridization)
Time Frame: up to 4 weeks after diagnosis
A "FISH" test will identify PWS/AS due to a deletion, but it will not identify those by UPD or an imprinting error.
STR(short tandem repeat) for UPD (uniparental disomy)
Time Frame: up to 4 weeks after diagnosis
A '"STR" test can identify PWS/AS duo to paternal or maternal UPD.
MS-MLPA (methylation-specific multiplex-ligation-dependent probe amplification)
Time Frame: up to 4 weeks after diagnosis
Use of the quantitative MS-MLPA method provides detailed information about deletions, rare duplications, and possibly UPD
Secondary Outcomes
No secondary outcomes reported