PMID- 30735756 OWN - NLM STAT- MEDLINE DCOM- 20200226 LR - 20200901 IS - 1879-1166 (Electronic) IS - 0198-8859 (Print) IS - 0198-8859 (Linking) VI - 80 IP - 9 DP - 2019 Sep TI - Tools for building, analyzing and evaluating HLA haplotypes from families. PG - 633-643 LID - S0198-8859(19)30133-8 [pii] LID - 10.1016/j.humimm.2019.01.010 [doi] AB - The highly polymorphic classical human leukocyte antigen (HLA) genes display strong linkage disequilibrium (LD) that results in conserved multi-locus haplotypes. For unrelated individuals in defined populations, HLA haplotype frequencies can be estimated using the expectation-maximization (EM) method. Haplotypes can also be constructed using HLA allele segregation from nuclear families. It is straightforward to identify many HLA genotyping inconsistencies by visually reviewing HLA allele segregation in family members. It is also possible to identify potential crossover events when two or more children are available in a nuclear family. This process of visual inspection can be unwieldy, and we developed the "HaplObserve" program to standardize the process and automatically build haplotypes using family-based HLA allele segregation. HaplObserve facilitates systematically building haplotypes, and reporting potential crossover events. HLA Haplotype Validator (HLAHapV) is a program originally developed to impute chromosomal phase from genotype data using reference haplotype data. We updated and adapted HLAHapV to systematically compare observed and estimated haplotypes. We also used HLAHapV to identify haplotypes when uninformative HLA genotypes are present in families. Finally, we developed "pould", an R package that calculates haplotype frequencies, and estimates standard measures of global (locus-level) LD from both observed and estimated haplotypes. CI - Copyright (c) 2019 American Society for Histocompatibility and Immunogenetics. Published by Elsevier Inc. All rights reserved. FAU - Osoegawa, Kazutoyo AU - Osoegawa K AD - Histocompatibility, Immunogenetics & Disease Profiling Laboratory, Stanford Blood Center, Palo Alto, CA, USA. Electronic address: kazutoyo@stanford.edu. FAU - Mack, Steven J AU - Mack SJ AD - Center for Genetics, Children's Hospital Oakland Research Institute, Oakland, CA, USA. FAU - Prestegaard, Matthew AU - Prestegaard M AD - National Marrow Donor Program, Minneapolis, MN, USA. FAU - Fernandez-Vina, Marcelo A AU - Fernandez-Vina MA AD - Histocompatibility, Immunogenetics & Disease Profiling Laboratory, Stanford Blood Center, Palo Alto, CA, USA; Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA. LA - eng GR - R01 AI128775/AI/NIAID NIH HHS/United States GR - R01 GM109030/GM/NIGMS NIH HHS/United States GR - U19 NS095774/NS/NINDS NIH HHS/United States PT - Journal Article PT - Review DEP - 20190205 PL - United States TA - Hum Immunol JT - Human immunology JID - 8010936 RN - 0 (HLA Antigens) SB - IM MH - Alleles MH - Child MH - Gene Frequency/genetics MH - Genetic Loci MH - HLA Antigens/*genetics MH - Haplotypes/*genetics MH - Heterozygote MH - Humans MH - Linkage Disequilibrium/genetics MH - Nuclear Family MH - Pedigree MH - *Software PMC - PMC6682467 MID - NIHMS1525565 OTO - NOTNLM OT - 17th International HLA and Immunogenetics Workshop OT - HLA OT - Haplotype OT - Linkage disequilibrium OT - Next generation sequencing COIS- Conflicts of Interests The authors declared no conflicting interests. EDAT- 2019/02/09 06:00 MHDA- 2020/02/27 06:00 PMCR- 2020/09/01 CRDT- 2019/02/09 06:00 PHST- 2018/08/07 00:00 [received] PHST- 2019/01/30 00:00 [revised] PHST- 2019/01/30 00:00 [accepted] PHST- 2019/02/09 06:00 [pubmed] PHST- 2020/02/27 06:00 [medline] PHST- 2019/02/09 06:00 [entrez] PHST- 2020/09/01 00:00 [pmc-release] AID - S0198-8859(19)30133-8 [pii] AID - 10.1016/j.humimm.2019.01.010 [doi] PST - ppublish SO - Hum Immunol. 2019 Sep;80(9):633-643. doi: 10.1016/j.humimm.2019.01.010. Epub 2019 Feb 5.