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Subtelomeric chromosomal abnormalities are emerging as an important cause of human genetic disorders. The scope of this investigation was to screen a selected group of children with idiopathic mental retardation for subtelomeric anomalies using the multiprobe telomeric FISH method and also to develop and test a new assay, the MAPH telomeric assay, in the same group of patients. The new MAPH telomeric assay uses the recently published MAPH methodology that permits the measurement of locus copy number by hybridisation with a specifically designed set of probes located at the end of human chromosomes. Seventy patients with idiopathic mental retardation have been screened using the established multiprobe telomeric FISH assay and the new MAPH telomeric assay, for all telomeres. One patient with de novo 8p subtelomeric deletion was identified. The new MAPH telomeric assay confirmed the same results in both normal and abnormal samples. This is the first description of the use of MAPH methodology to detect chromosomal imbalances near the telomeres in idiopathic mentally retarded patients. The new MAPH telomeric assay offers a new, fast, accurate and cost effective diagnostic tool to detect chromosomal imbalances near telomeres in mentally retarded patients, as well as the characterisation of known chromosomal abnormalities, spontaneous recurrent miscarriages, infertility, hematological malignancies, preimplantation genetic diagnosis, and other fields of clinical and research interests.

european journal of human genetics

Screening for subtelomeric chromosome abnormalities in children with idiopathic mental retardation using multiprobe telomeric FISH and the new MAPH telomeric assay