Racing Pigeon DNA¶

DNA is the carrier of genetic information in racing pigeons. Understanding the basic structure of DNA and marker technology is the first step to reading a DNA test report.

Plain-language explanation (an analogy)¶

DNA is like the "master manual for 40 chromosomes" (the pigeon chromosome number is 2n=80, i.e. 40 pairs, referring here to a total of 40 pairs of chromosomes). Every pigeon is a unique "revised edition" of this manual, and the differences lie in subtle changes in the base sequence.

DNA basics¶

DNA is made up of four bases, A, T, C and G, and the sequence stores genetic information;
A gene is a DNA segment that encodes a protein or performs a regulatory function;
The pigeon genome is around 1.1 billion base pairs, and a reference genome has been assembled (Holt 2018, G3);
Sequence differences (variation) between individuals are the source of genetic diversity.

Common marker types¶

SNP (single nucleotide polymorphism): variation at a single base position, the most numerous type, suited to high-throughput typing;
Microsatellite (STR): differences in the number of repeats of a short sequence, mostly used for individual identification and parentage analysis;
Indel: small insertions or deletions.

How testing works¶

DNA testing amplifies target fragments by PCR and reads the genotype at a locus. qPCR is used for pathogen detection, while SNP/STR typing is used for gene and identity testing. The "genotype" in a report describes the combination of alleles an individual carries at a particular locus.

Three major applications of DNA testing¶

Gene testing: candidate performance gene genotyping, a breeding reference;
DNA identity card: unique markers for an individual, pedigree management;
Parentage verification: STR locus comparison to verify parent-offspring relationships.

Frequently asked questions¶

Does DNA testing hurt the pigeon?

No. Sampling uses feathers, blood cards or buccal swabs, which are minimally invasive procedures.

Can a DNA identity card prevent cheating?

DNA markers cannot be forged, so they can serve as a basis for verifying the identity of an individual.

Is pigeon DNA like human DNA?

It is the same DNA-based inheritance system, but the sequences and genome structures differ enormously.

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