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Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation

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MultiCook: A Tool That Improves Accuracy of HLA Imputation by Combining Probabilities From Multiple Reference Panels

Hakin Kim¹, Hyunjoon Lim¹, Buhm Han^1,2,3

¹Interdisciplinary Program for Bioengineering, Seoul National University, Seoul, Republic of Korea.

|May 6, 2025

Summary

MultiCook improves Human Leukocyte Antigen (HLA) genotype imputation accuracy by combining multiple reference panels. This method significantly reduces imputation error rates, especially for low-frequency alleles, making HLA typing more accessible.

Keywords:

HLA imputation diverse ethnicity reference panel

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Area of Science:

Immunogenetics
Computational Biology
Genomics

Background:

Human Leukocyte Antigen (HLA) genotype imputation is crucial for genetic studies but traditionally costly.
Current computational methods using single nucleotide polymorphism (SNP) markers offer a cost-effective alternative.
Existing imputation methods require ethnicity-matched reference panels, which are often limited in size and availability.

Purpose of the Study:

To introduce MultiCook, a novel computational tool for enhancing HLA genotype imputation.
To enable the simultaneous utilization of multiple HLA imputation methods and reference panels.
To improve imputation accuracy and efficiency, particularly for diverse populations.

Main Methods:

Developed MultiCook to integrate multiple HLA imputation algorithms and reference panels.
Enabled merging of panels from different SNP genotyping platforms.
Allowed combination of outputs from various imputation methods and the Michigan Imputation Server.

Main Results:

MultiCook reduced the imputation error rate by approximately one third in a Korean cohort (from 4.70% to 3.31%) by combining East Asian and Han Chinese reference panels.
Demonstrated improved accuracy for imputing low-frequency HLA alleles compared to single-panel approaches and the Michigan HLA imputation server.
Showcased versatility in merging diverse reference panels and imputation method outputs.

Conclusions:

MultiCook offers a versatile and effective solution for improving HLA genotype imputation accuracy.
The tool addresses the limitations of scarce, ethnicity-specific reference panels by enabling the combined use of multiple resources.
MultiCook enhances the accessibility and reliability of HLA imputation for a wider range of populations and research applications.