realDB: A Genome Database for Red Algae

Chondrus crispus

Overview
1. commonly called Irish moss or carrageen moss (Irish carraigín, "little rock")
2. grows abundantly along the rocky parts of the Atlantic coast of Europe and North America.
3. In its fresh condition this protist is soft and cartilaginous, varying in color from a greenish-yellow, through red, to a dark purple or purplish-brown.
4. The principal constituent is a mucilaginous body, made of the polysaccharide carrageenan, which constitutes 55% of its weight. The organism also consists of nearly 10% protein and about 15% mineral matter, and is rich in iodine and sulfur.
5. When softened in water it has a sea-like odour and because of the abundant cell wall polysaccharides it will form a jelly when boiled, containing from 20 to 100 times its weight of water.
6. Chondrus crispus undergoes an alternation of generation life cycle common in many species of algae. There are two distinct stages: the sexual haploid gametophyte stage and the asexual diploid sporophyte stage. In addition, there is a third stage- the carposporophyte, which is formed on the female gametophyte after fertilization.
7. It has been used as a model species to study photosynthesis, carrageenan biosynthesis, and stress responses. The nuclear genome was sequenced in 2013.


Data Source
From Jonas Collén, at Pierre-et-Marie-Curie University of Paris VI,Station Biologique, 29680 Roscoff, France;


Reference Publication(s)
Collén J, et al. Genome structure and metabolic features in the red seaweed Chondrus crispus shed light on evolution of the Archaeplastida. Proc Natl Acad Sci USA. 2013; 110 (13): 5247-52.


Statistics of genome

Genome size (Mb)

105

Protein-coding loci

9606

% coding

8

Introns per gene

0.32

Average intron length (bp)

123

Introns per gene

0.32

Total sequence length

104,980,420

Total assembly gap length

895,144

Gaps between scaffolds

0

Number of scaffolds

926

Scaffold N50

242,694

Scaffold L50

126

Number of contigs

3,242

Contig N50

77,748

Contig L50

392

Total number of chromosomes and plasmids

1