Alenka Erjavec Škerget (Author), Boris Zagradišnik (Author), Nadja Kokalj-Vokač (Author)

Abstract

Izhodišča. Kromosomske napake so lahko eden od vzrokov za idiopatsko mentalno retardacijo (IMR) in dismorfologijo. V prispevku poročamo o vpeljavi simultane metode fluorescenčne hibridizacije "in situ" (FISH) za odkrivanje subtelomernih kromosomskih preureditev. Ugotavljamo, da je metoda lahko uporabna za rutinsko citogenetsko diagnostiko IMR, kongenitalnih anomalij in razreševanje kompleksnejših kariotipov. Pilotsko študijo smo izvedli pri 56 bolnikih, otrocih iz severovzhodne Slovenije, ki so bili napoteni v citogenetski laboratorij z diagnozo mentalne retardacije in/ali displastičnih znakov. Metode. Vsem bolnikom smo odvzeli 5 ml periferne krvi in jih kariotipizirali. Za odkrivanje kromosomskih sprememb v terminalnih regijah kromosomov smo uporabili metodo FISH z uporabo kompleta Multiprobe T-System (Cytocell) ter posamezne lokusno specifične DNK sonde. Rezultati. Subtelomerne spremembe smo našli pri 5,4% bolnikov. Od tega so pri 3,6% bolnikov subtelomerne aberacije nastale "de novo". 2q subtelomerna delecija: del(2)(qtel), ki smo jo našli pri dveh bolnikih, pa se je izkazala kot dedovani polimorfizem. Subtelomerne aberacije smo potrdili pri enem pacientu z delecijo terminalnega dela kratkega kraka kromosoma X: del(X)(ptel) in pri drugem z delecijo terminalnega dela dolgega kraka 13: del(13)(qtel) in parcialno trisomijo dela dolgega kraka kromosoma 10. Zaključki. S prikazano študijo ugotavljamo, da je metoda FISH z multiplimi subtelomernimi DNK-sondami uporabno diagnostično orodje za odkrivanje enega od vzrokov IMR pri bolnikih z displastičnimi znaki ali brez teh znakov s sicer normalnim kariotipom.

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Data

Language: Slovenian
Year of publishing:
Typology: 1.04 - Professional Article
Organization: UM - University of Maribor
UDC: 616.8
COBISS: 1245759 Link will open in a new window
ISSN: 1318-0347
Parent publication: Zdravniški vestnik
Views: 1453
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Secondary language: English
Secondary title: Subtelomeric chromosomal abberations - one of the reasons for idiopathic mental retardation
Secondary abstract: Background. Cryptic subtelomeric chromosome anomalies have been recongnised as a significant cause of idiopathic mental retardation (IMR) and/or dysmorphology. This study presents an innovative simmultane fluorescence in situ hybridisation (FISH) technique for detection of subtelomeric rearrangements that was introduced to the laboratory. It was found out that this method is a very useful diagnostic tool with application in the field of idiopathic mental retardation, for detection of congenital abnormalities and in resolving complex karyotypes. This study was done on 56 mentally retarded and/or dysmorphic children from the north-eastern part of Slovenia. Methods. All patients were karyotyped using 5 ml peripheral blood samples. FISH testingusing Cytocell Multiprobe T-System and some locus specific DNA-probes was performed for detection of subtelomeric chromosomal rearrangements. Results. Subtelomeric alterations were detected in 5.4% patients. Clinical significant "de novo" subtelomeric aberrations were detected in 3.6% of patients while deletion of the 2q subtelomeric region del(2)(qtel) appeared to be a common variant and inheritive in both of our cases. Two subtelomeric aberrations such as del(X)(ptel) and monosomy of (13)(qtel), and partial trisomy of chromosome 10 in (10)(qtel) region were found among the patients during this screening. Conclusions. Furthermore, fluorescence in situ hybridisation (FISH) technique using the multiprobe subtelomeric DNA system proved to be a useful diagnostic tool for screening the patients with or without dysmorphic feature and normal karyotype.
Secondary keywords: Mental retardation;Duševna zaostalost;Chromosome aberrations;Kromosomske preureditve;In situ hybridization, fluorescence;Fluorescenčna "in situ" hibridizacija;DNA probes;DNA sonde;Karyotyping;Kariotip, določanje;Telomera;
URN: URN:NBN:SI
Type (COBISS): Not categorized
Pages: str. 359-365
Volume: ǂLetn. ǂ72
Issue: ǂšt. ǂ6
Chronology: 2003
ID: 9101467