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Title: Expression of Genes Related to Carrageenan Synthesis during Carposporogenesis of the Red Seaweed Grateloupia imbricata
Authors: García Jiménez, M. Del Pilar 
Mantesa, Sara R.
Robaina Romero, Rafael Juan 
UNESCO Clasification: 241404 Bacteriología
Keywords: Carbohydrate sulfotransferase
Cytochrome P450
Galactose-6 sulfurylase
Red alga
Reproduction stages
WD 40
Issue Date: 2020
Journal: Marine Drugs 
Abstract: Carrageenan, the foremost constituent of extracellular matrix of some rhodophyta, is a galactan backbone with a di erent number of sulphate groups attached. Variations of degree of sulphation are associated with di erent types of carrageenans, which vary according to seaweed life cycles, and have consequences for the exploitation of this raw material. In this work, we used three well-recognised stages of development thalli and two stages of cystocarp maturation to analyse genes that encode addition and elimination of sulphate groups to cell-wall galactan of the red seaweed Grateloupia imbricata. Expressions of carbohydrate sulfotransferase and galactose-6 sulfurylase and genes encoding stress proteins such as cytochrome P450 and WD40, were examined. Results showed that transcript expression of carbohydrate sulfotransferase occurs at all stage of thalli development. Meanwhile galactose-6 sulfurylase expressions displayed di erent roles, which could be related to a temporal regulation of cystocarp maturation. Cytochrome P450 and WD40 are related to the disclosure and maturation of cystocarps of G. imbricata. Our conclusion is that di erential expression of genes encoding proteins involved in the sulphation and desulphation of galactan backbone is associated with alterations in thalli development and cystocarp maturation in the red seaweed Grateloupia imbricata. Exploitation of industry-valued carrageenan will depend on insight into gene mechanisms of red seaweeds.
ISSN: 1660-3397
DOI: 10.3390/md18090432
Source: Marine Drugs [1660-3397], 2020 Aug 19;18(9):E432
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