Table 3. Retrotransposons in the yeast genome

 

Chromosome 
 
Ty1 Ty2 Ty3 Ty4 Ty5 Total
I Aa (1)         1
II BLv, BRa (2) B (1)       3
III   Ca (1)     C (1) 2
IV DR1, DR2bv, DR3, DR4b, DR5, DR6 (6) DR1,DR2,DR3 (3)       9
V ER1, ER2b (2)         2
VI   F (1)       1
VII GR1, GR2, GR3a (3) GR1a,GR2 (2) Gv (1)     6
VIII Hi (1)     H (1)   2
IX     I (1)     1
X JR1, JR2 (2)     Ja (1)   3
XI           0
XII LR1, LR2, LR3, 
LR4a (4)
LR1,LR2ab (2)       6
XIII ML1b, ML2, MR1v, MR2b (4)         4
XIV NL1a, NL2v (2) N (1)       3
XV OL, OR (2) OR1, OR2 (2)       4
XVI PL; PR1, PR2a, PR3 (4)     Pa (1)   5
             
total found 33 13 2 3   52
in 'old'site 15 11 1 3   31
in 'new'site 18 2 1 0   21
subtypes two v) one two one    
solo elements or remnants           268

 
Nomenclature of the Ty elements is as in the sequence annotations by MIPS  (e.g., ML1 is the first element on the left arm of chromosome XIII); number of elements on a given chromosome in brackets.
a) Sequence ambiguities vs. consensus; probably sequencing error.
b) Non-intact element.
i) Insert of 114 bp corresponding to 38 amino acids (cloning artefact?).
v) Ty1_BL, Ty1_DR2, Ty1_MR1, and Ty1_NL2 belong to a second subtype of Ty1 elements having a variant TYA protein sequence.