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Table 1 Original and current gene catalogs for human chromosomes 21 and 22

From: After 'completion': the changing face of human chromosomes 21 and 22

Gene category

Chromosome 21

Chromosome 22

 

May 2000 [2]

February 2004 [16]

December 1999 [1]

January 2003 [13]

Known

127

241

247

393

Novel coding sequences

13

1

150

153

Novel transcripts

17

25

0

0

Putative

68

17

148

31

Total non-pseudogenes

225

284

545

577

Pseudogenes

59

98

134

234

Total

284

382

679

811

Immunoglobulin segments (all types)*

   

125

Grand total

   

936

  1. *Chromosome 22 contains the human immunoglobulin lambda gene locus, which is a very complex region consisting of active and inactive (pseudogene) immunoglobulin gene segments.