A set of discrete, genetically-linked sequence alterations that reside on the same chromosomal strand and are typically co-inherited within a haplotype block.

This is just here as a test because I lose it

Term information


A haplotype is a set of non-overlapping alleles that reside in close proximity on the same DNA strand. We model them as 'complements' because they include all known/relevant alleles within a defined region in the genome (e.g. a 'gene', or a 'haplotype block') - where this set may consist of 0, 1, or more alterations from some reference. Because they are genetically linked, the alleles comprising a haplotype are likely to be co-inherited and survive descent across many generations of reproduction. As highlighted in https://en.wikipedia.org/wiki/Haplotype, the term 'haplotype' is most commonly used to describe the following scenarios of genetic linkage between 'alleles': 1. The 'alleles' comprising the haplotype are 'single nucleotide polymorphisms' (SNPs) or other small alterations, which collectively tend to occur together on a chromosomal strand). This use of 'haplotype' is commonly seen in phasing of patient WGS or WES data, to describe a state where two or more alterations that are believed to occur 'in cis' on the same chromosomal strand. 2. The 'alleles' comprising the haplotype are SNPs or other short alterations, which collectively define a specific version of a gene. In this case, the locaiton bounding the haplotype corresponds to a gene locus, and the haplotype defines a specific allele of that gene (i.e 'gene allele'). "Star alleles" of PGx genes are examples of this category of haplotype (e.g. https://www.ebi.ac.uk/cgi-bin/ipd/imgt/hla/get_allele_hgvs.cgi?A*33:01:01, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4724253/). 3. Each of the 'alleles' comprising the haplotype is itself a 'gene allele' (i.e. a specific version of an entire gene), such that the haolotype contains multiple complete 'gene alleles' that are co-inherited because they reside in tightly linked clusters on a single chromosome. Each of these more specific definition serves a purpose for a particular type of genetic analysis or use case. The GENO definition of 'haplotype' is broadly inclusive of these and any other scenarios where distinct 'alleles' of any kind on the same chromosomal strand are genetically linked, and thus tend to be co-inherited across successive generations.

editor note

Consider if we dont want to define this as a 'complement', as it implies a complet set of memebrs of a defined type. But many haplotypes will be incomplete, due to lack of knowledge of other variation bound by the haplotype block. Instead, we can create an 'allele set' class as the haplotype parent?


Informed by https://isogg.org/wiki/Haplotype and https://en.wikipedia.org/wiki/Haplotype.

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