Genetic Markers in Racing Pigeons¶

Genetic markers are sites on the DNA that can be used to "identify individual differences". They are the "road signs" of genetic testing, parentage verification and genetic research, letting us tell pigeons apart at the molecular level.

Plain-language explanation (an analogy)¶

If each pigeon's DNA were a unique "code book", then genetic markers are the typos or special marks in that book that differ from bird to bird. Scientists do not read the whole book; they compare only a few key markers and can then tell which genotype a pigeon carries and who it is related to - much as a few distinctive features are enough to recognise a person.

Common types of genetic markers¶

Two classes of markers are mainly used in racing pigeon genetic research:

SNP (single nucleotide polymorphism)¶

A SNP is a variation at a single base in the DNA - for example, a position that is normally A has become G. It is the most common and most widely distributed type of variation in the genome.

Use: candidate gene genotyping and performance association studies;
Examples: the study of LDHA gene polymorphism and racing survivability (Ramadan 2018) and the study of MSTN exon 3 polymorphism (Dybus 2013) analysed genotypes precisely by detecting these genetic differences.

STR (short tandem repeat)¶

An STR is a difference in how many times a short repeat sequence in the DNA (such as "ATATAT...") is repeated. Repeat numbers differ between individuals, so STRs are highly individual-specific, almost like a "barcode".

Use: DNA identity and parentage verification;
Advantage: strong ability to distinguish individuals; the core marker for building DNA fingerprints.

Other marker types such as VNTR and InDel also exist, but SNP and STR are the most widely used in the racing pigeon field.

Identifying and applying genetic markers¶

Genetic marker research usually has two steps:

Identification: discover and validate variant sites that can be used for genotyping, using techniques such as sequencing;
Application: establish genotyping methods for individual genotype testing, parentage determination or population genetic analysis.

The MSTN polymorphism study (Dybus et al., 2013) is a typical "identification" case - the researchers sequenced MSTN exon 3 in different domestic pigeon breeds, found SNP variant sites, and compared the differences in variant frequency between breeds.

Relevance to racing pigeons¶

Genetic markers are the technical base of racing pigeon genetic testing:

Performance gene testing: read the candidate genotypes an individual carries (such as LDHA, DRD4) through SNP genotyping;
DNA identity: build an individual-specific DNA fingerprint from STR markers;
Parentage verification: confirm relatedness scientifically by comparing STR markers.

Key points¶

Genetic markers are sites on the DNA where individual differences can be identified;
SNP is a single-base variant, used for candidate gene genotyping and performance association studies;
STR is a difference in the number of repeat sequences, used for DNA identity and parentage verification;
Marker research has two steps: "identification" and "application";
Genetic markers are the technical foundation of genetic testing and parentage verification.

Main site testing services¶

To learn more about racing pigeon genetic testing services, visit the Seno Genetic Testing Center main site -> Knowledge Center.