[Chromosomal microarray comparative genome hybridization (arrayCGH) in prenatal settings. Proposal for Hungarian application in clinical practice].

Abstract:

:Invasive prenatal testing and conventional G-banding chromosome analysis have been considered to be the gold standard of fetal cytogenetic diagnosis. Standard karyotyping is, however, constrained by the limits of the resolution of using a microscope. The advantage of molecular karyotyping, array based methods is the evaluation of sub-microscopic copy number changes across the whole genome in a single analysis. The application of array comparative genome hybridization has greatly increased the detection of pathogenic chromosomal abnormalities in prenatal settings. Based on available data in the international literature of the last decade, the clinical utility of arrayCGH is the recognition of some 1-2% and 5-7% additional genetical information compared to metaphase karyotype alone in fetuses without ultrasound anomaly and in fetuses with ultrasonographically detected malformations, respectively. Thus arrayCGH improves the prenatal diagnosis of genetic abnormalities mainly in fetuses with structural sonographic findings. In the present paper we review the literature of chromosomal microarray and make a proposal for the application of the method in Hungarian prenatal genetical practice. Orv Hetil. 2019; 160(13): 484-493. :Absztrakt: Az invazív mintavétel kapcsán elvégzett hagyományos magzati kromoszómavizsgálat a mai napig a praenatalis diagnosztika alapvető vizsgálómódszere. Felhasználásának a fénymikroszkópos vizsgálat felbontási képessége szab határt. A kariotipizálással nem felismerhető, szubmikroszkópos kromoszóma-rendellenességek, microdeletiók és microduplicatiók, kópiaszám-variációk (CNV-k) vizsgálatára a nagy felbontású molekuláris vizsgálóeljárások biztosítanak lehetőséget. A kromoszomális összehasonlító microarray-vizsgálat (array-komparatív genomhibridizálás – arrayCGH) alkalmas az anyai életkortól függetlenül előforduló kópiaszám-variációk prae- és postnatalis kimutatására. A módszer a fejlett országok orvosi gyakorlatában rutinszerűen alkalmazott eljárás a magzati diagnosztikában. Az elmúlt egy évtized külföldi eredményei alapján alkalmazása ultrahangeltérést nem mutató magzatok esetén körülbelül 1–2%, strukturális ultrahangeltérést mutató magzatoknál körülbelül 5–7% többlet genetikai információval szolgál a hagyományos kromoszómavizsgálattal szemben. Közleményünkben áttekintjük az arrayCGH módszerét, praenatalis alkalmazásának nemzetközi gyakorlatát, s javaslatokat és indikációs kört fogalmazunk meg a módszer praenatalis használatának magyarországi bevezetésére. Orv Hetil. 2019; 160(13): 484–493.

journal_name

Orv Hetil

journal_title

Orvosi hetilap

authors

Tidrenczel Z,P Tardy E,Pikó H,Sarkadi E,Böjtös I,Demeter J,Kósa PJ,Beke A

doi

10.1556/650.2019.31322

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

484-493

issue

13

eissn

0030-6002

issn

1788-6120

journal_volume

160

pub_type

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