Practicable approaches to facilitate rapid and accurate molecular cytogenetic mapping in birds and mammals

Morris, W., Stephenson, J., Robertson, L., Turner, K., Brown, H., Ioannou, D., Tempest, H., Skinner, B. and Griffin, D. (2007) Practicable approaches to facilitate rapid and accurate molecular cytogenetic mapping in birds and mammals. Cytogenetics and Genome Research, 117 (1-4). pp. 36-42. ISSN 1424-8581.

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Molecular cytogenetic mapping by FISH is a common feature of most genome projects as it provides a global, low-resolution overview of the genome and facilitates comparative genomics.
An essential prerequisite for cytogenetic mapping is the ability to identify accurately the chromosome on which the clone (e.g. BAC) resides.
This is not usually a barrier to human mapping as knowledge of the human karyotype is commonplace. For other species however accurate assignment can be problematic either because, as in birds, the karyotype is too complex to analyze by standard means or because of the paucity of individuals skilled to perform the karyotyping. Using chicken as a model we have developed a reproducible approach for accurate cytogenetic mapping that involves: a single colour FISH, measurement of the ratio of the size of the signal bearing chromosome to that of chromosome 8, and final assignment through a small series of dual colour experiments.
Reference values for size ratios were established using base pair estimate information from the Ensembl browser. By this method cytogenetic mapping to highly complex karyotypes can be achieved in a small number of simple steps.
We have also developed and tested a karyotyping tutorial programme adapted from one previously reported in this journal. That is, we have used pig as an example of a model species with a relatively tractable karyotype and demonstrated that scientists and students, even after only one hour using our tutorial, can readily identify pig chromosomes and thus make appropriate assignments using FISH. Simple, practicable means often provide preferable solutions than complex alternatives (e.g. m-FISH) to the solution of scientific problems.
Such is the case for the approaches described here.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history > QH0301 Biology (General) > QH0426 Genetics
Divisions: Faculty of Social and Applied Sciences > School of Human and Life Sciences
Depositing User: Dr Kara Turner
Date Deposited: 29 Jun 2017 08:42
Last Modified: 30 Jun 2017 12:35

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Last edited: 29/06/2016 12:23:00