Recombination frequencies of human leukocyte antigen loci in hematological malignancies among Turkish population
Funding information
The institution's facilities were used as a financial resource. Xth Eurasian Hematology-Oncology Congress, 8–11 October 2019, Istanbul, Turkey. Leukemia Research 85S1 (2019) S62. Best of ASBMT Tandem Meetins Uluslararası Sempozyum, 27–28 March 2015, Ankara-Turkey. 19th European Immunogenetics &Histocompatibility Conference, 23–26 April 2005, Istanbul-Turkey. Genes &Immunity 2005;6:26.
Abstract
Introduction
Allogeneic hematopoietic stem cell transplantation (HSCT) is a treatment option with growing performance for leukaemia, aplastic anaemia and genetic disorders. The frequency of MHC (Major Histocompatibility Complex) gene locus recombination is increased at loci close to the telomeres and in the female gender. The aim of the present study is to document the recombination events by pedigree diagrams with the primary goal to determine the frequency of recombination in a different ethnic population from mostly reported studies.
Methods
Altogether 9545 allogeneic HSCT recipients and their family-based potential donors (n:36231) were included in this retrospective study.
Results
Recombinations were determined in 118 (F/M:50/68) out of 9545 families enrolled on the study. These were present in 40 of the patients and 78 of healthy donors. The frequency of recombinations was 0.42% and 0.22%, in patients and donors, respectively. Of the 118 recombinations, 60 were detected in A locus (13 inpatients), 14 in B locus (3 inpatients) and 42 in DR locus (22 inpatients). In our study, due to recombinations in HLA (Human Leukocyte Antigen)-A,-B,–DR loci, we found that some patient-donor pairs became 6/5 matched instead of 6/6 (n:45), eliminating the allogeneic HSCT possibility for the patients from the full-matched siblings.
Conclusion
To our knowledge, this is the first study reporting the recombination frequencies in HLA loci among Turkish population and thus, providing informative data to the clinicians regarding the cross-over possibilities in Turkish patients with haematological malignancies.
CONFLICT OF INTEREST
None.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available on request from the corresponding author, [Cigdem Kekik Cinar].
