CLASSIFIER OF DOMESTIC PIG (SUS SCROFA DOMESTICUS) AUTOMATIC
CHROMOSOME IDENTIFICATION
V.N. Stefanova,1,* M.N. Zenina 2
1 Institute of Cytology RAS and 2 Institute of Hematology and Transfusiology, St. Petersburg;;
* e-mail: vestefan@mail.ru
Automated chromosome classification is an essential task in cytogenetics of animals and plants. Until now
the automatic karyotyping systems were obtained only for human chromosomes. The main aim of this study
was to develop the automatic pig chromosome classifier using image processing software «VideoTest-Karyo
3.1». To solve this problem 1578 chromosomes from 47 metaphases were used. The constructed classifier was
checked with the use of additional sample of metaphases classified in fully automatic regime: error rate was
8.2 %, this corresponds to 3.12 ± 0.26 errors per metaphase plate (these values are within acceptable limits for
such kind of studies). In further studies the extra sample of pig acrocentric chromosomes was added to classifier
up to 1807 chromosomes. This addition reduced the error rate up to 6.1 %, which correspondes to 2.78 ± 0.18
errors per metaphase plate. It should be underlined that the revealed errors can immediately be corrected by an
operator on every stage of analysis. The classifier was also verified using the chromosomes of boar with
rcp(1p–; 11p+) in fully automatic regime and routine stained metaphases of Siberian minipigs with rob (16;17)
in semi automatic regime. In both cases the chromosomes were identified correctly. The area of application of
obtained pig automatic chromosome classifier is discussed.
Key words: pig chromosome, karyotyping, automatic classification, "VideoTest-Karyo 3.1" image processing
software
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