Sat, May 10, 2008 - Page 2 News List

DNA barcoding project nears completion: COA

JUST A 'SIDE BENEFIT' The Barcode of Life Databank will use species-specific DNA sequences to identify samples within three days and for less than NT$1,000

By Meggie Lu  /  STAFF REPORTER

Merchants conspiring to pass oilfish for the more expensive cod may soon be unable to do so, as a Barcode of Life Databank (BOLD) capable of identifying fish samples within days is under way and would be completed as early as next year, the Council of Agriculture (COA) said yesterday.

The COA-funded BOLD project is part of the Consortium for the Barcode of Life (CBOL), an international collaboration project devoted to identifying global biological species using DNA barcodes, said project leader and research fellow at the Academia Sinica’s research center for biodiversity, Shao Kwang-tsao (邵廣昭).

“DNA barcoding is a taxonomic technique that uses short but species-specific DNA sequences in the genome for species identification,” Shao said.

The most common section of DNA used is cytochrome c oxidase subunit 1 (CO1), a gene in the mitochondria, because CO1 variation is very small within species but disparate in different species, he said.

Once a species’ CO1 sequence is filed into BOLD, the speedy and economical DNA barcode can analyze fish samples within 3 days for less than NT$1,000.

“For example, when a cargo of fish comes into the country via seaports, we can identify what type of fish they are even with their heads and tails cut off so that consumers can be sure of the type of fish they are purchasing,” he said.

Seaport patrols can similarly use the technique to prevent illegal fish smuggling, he said.

Among the 300-some fish commonly consumed by Taiwanese, 200 fish types have already been successfully identified, Shao said, adding that the databank would be completed by next year.

Though the project was commissioned by the COA, commercial fish identification was merely a “side benefit” of the BOLD project, center research assistant Chen Hsuan-wen (陳宣汶) said.

“Including fish species, CBOL has so far documented 38,762 species globally with 392,594 records in the bank,” he said. “Biodiversity is an invaluable resource we have. For people to know ways to conserve the ecosystem, we must first know what is out there.”

BOLD is a collaboration of international scholars to build a complete global biodiversity databank, aimed at fostering in people a better understanding and appreciation for the vastness of the variety of life on the planet, he said.

For example, he said, the databank can be useful when assessing the biodiversity impact and feasibility of development of a certain area.

“The current environmental impact assessment (EIA) process allows limited time for EIA committees to obtain information on the biodiversity of proposed construction sites,” he said. “If, say, a comprehensive BOLD system was in place, the Suhua Freeway EIA committee would be able to quickly understand the endemic ecosystem, from microorganisms to higher level animals, and make a better informed decision based on the information.”

BOLD further provides continuity in biodiversity taxonomy research, Chen said.

“Many species may not be observed easily, so to pass down valuable information effectively, a globally understandable identification system would be very important, and DNA barcodes fit the bill,” he said.

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