[Application of interphase cytogenetics for the determination of changes in the DNA content in acute childhood lymphoid leukemia].
The authors investigated the usefulness of the interphase cytogenetic approach to reveal numerical chromosomal abnormalities. Experiments performed on normal human cells using chromosome specific (peri)centromeric probes indicated that disomy was recognized in a range of 89.1 +/- 5.4%-96.8 +/- 0.4% for the somatic chromosomes and in 98.1 +/- 0.8% for the sex chromosomes. Using positivity threshold of mean percentage of the fals monosomy and trisomy + 2 SD, chromosome loss or gain for the somatic chromosomes could be revealed beyond clonal ratio of 3.6-13.2% and 1.1-6.8%, respectively. The same value for the sex chromosomes was 3.2% and 0%, respectively. Eleven pediatric acute lymphoid leukaemia were investigated for chromosomal aneuploidy by interphase cytogenetics using chromosome specific (peri)centromeric probes for all the somatic and sex chromosomes. Results were compared with metaphase cytogenetic and flow cytometry derived gross DNA aneuploidy data. In 5 cases the leukaemic cells proved to be diploid with all three methods at both gross DNA and chromosome levels. Interphase cytogenetics revealed chromosome loss or gain in all the remaining 6 cases, however, metaphase analysis indicated numerical aberration in only 2 patients. In one of them only the increased chromosome number could have been detected without identifying the chromosomes involved and in the other one the two methods indicated trisomy for not the same chromosome. Flow cytometry data showed aneuploidy in 3 out of the 6 aneuploid leukaemia. The results imply that interphase cytogenetics might be more accurate as compared with flow cytometry and metaphase analysis to reveale aneuploidy.
Szuhai
K
K
Pécsi Orvostudományi Egyetem, Pathologiai Intézet.
Méhes
G
G
Kosztolányi
G
G
Kajtár
P
P
Lendvai
G
G
Szanyi
I
I
Pajor
L
L
D000367:Age Factors; D000782:Aneuploidy; D002648:Child; D003582:Cytogenetics; D004247:DNA; D005434:Flow Cytometry; D006801:Humans; D008677:Metaphase; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics*
D004247:DNA