TEL05R-Yp, the long Y' (Y'-L) element on the right arm of chromosome V, contains an ARS consensus sequence, a region of 36-bp repeats, one verified ORF YRF1-2/YER190W, one uncharacterized ORF YER189W, and two dubious ORFs (YER190C-A, YER190C-B).

The Y' element is a repetitive sequence found in many but not all subtelomeric regions next to the telomeric repeats, or adjacent X element combinatorial repeats, either as a single copy or tandem repeat of two to four copies(3, 4). Two main types of Y' elements are known, Y'-L and Y'-S, and any particular array will consist of only one type, not a combination of both (5). Y' elements contain helicase-encoding ORFs which are expressed only during meiosis and in telomerase-deficient cells (5). Possible functions include rescue of telomeres when the telomeric repeats are no longer present and a role in telomere maintenance during meiosis (5).

Other features of TEL05R, the right telomeric region of chromosome V, include an X element core sequence TEL05R-XC, and a region of X element combinatorial repeats TEL05R-XR.

Click on the following figure for more details:

Further information can be found at the website of Dr. Ed Louis, Institute of Genetics, The University of Nottingham.

Last updated: 2003-11-18