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The purpose is to determine the benefit of next generation sequencing (NGS) targeted on genes involved in intellectual disability for etiologic diagnosis of intellectual disabilities. In other words, it concerns the number of patients whose etiologic diagnosis will be established with NGS and could not with common techniques. Actually, the molecular etiology of intellectual disability is crucial to calculate the risk of recurrence and allows the perinatal diagnosis to these families.
Secondary purposes are:
1. To determine the place of NGS in the strategy of etiologic diagnosis of intellectual disability, to determine the order of analyses performed for a patient with intellectual disability without clinical signs.
2. To evaluate the number of variants with unknown significance and thus non-usable for genetic counselling without supplementary analysis.
3. To determine the number of samples that can be at most pooled keeping a good efficacy of capture and results with suitable read depth
4. To determine the possibility of detecting copy number variations (CNVs) in genes of interest with NGS
5. To establish genotype/phenotype correlations for each gene for which a mutation has been identified
6. To optimize the software pipelining for a rapid analysis for diagnosis.
Observational Model: Cohort, Time Perspective: Cross-Sectional
Active, not recruiting
Central Hospital, Nancy, France
Published on BioPortfolio: 2016-09-06T16:08:21-0400
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Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)
The fraction of a blood sample, following CENTRIFUGATION, that is distinguished as a thin light-colored layer between the RED BLOOD CELLS, underneath it, and the PLASMA, above it. It is composed mostly of WHITE BLOOD CELLS and PLATELETS.
The number of RED BLOOD CELLS per unit volume in a sample of venous BLOOD.
The number of LEUKOCYTES and ERYTHROCYTES per unit volume in a sample of venous BLOOD. A complete blood count (CBC) also includes measurement of the HEMOGLOBIN; HEMATOCRIT; and ERYTHROCYTE INDICES.
Birth defect that results in a partial or complete absence of the CORPUS CALLOSUM. It may be isolated or a part of a syndrome (e.g., AICARDI'S SYNDROME; ACROCALLOSAL SYNDROME; ANDERMANN SYNDROME; and HOLOPROSENCEPHALY). Clinical manifestations include neuromotor skill impairment and INTELLECTUAL DISABILITY of variable severity.
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