Control of cell division by a retinoblastoma protein homolog in Chlamydomonas.

Abstract:

:A key pathway that controls both cell division and differentiation in animal cells is mediated by the retinoblastoma (RB) family of tumor suppressors, which gate the passage of cells from G(1) to S and through S phase. The role(s) of the RB pathway in plants are not yet clearly defined, nor has there been any evidence for its presence in unicellular organisms. Here we have identified an RB homolog encoded by the mat3 gene in Chlamydomonas reinhardtii, a unicellular green alga in the land plant lineage. Chlamydomonas cells normally grow to many times their original size during a prolonged G(1) and then undergo multiple alternating rounds of S phase and mitosis to produce daughter cells of uniform size. mat3 mutants produce small daughter cells and show defects in two size-dependent cell cycle controls: They initiate the cell cycle at a below-normal size, and they undergo extra rounds of S phase/mitosis. Unlike mammalian RB mutants, mat3 mutants do not have a shortened G(1), do not enter S phase prematurely, and can exit the cell cycle and differentiate normally, indicating that the RB pathway in Chlamydomonas has a different role than in animals.

journal_name

Genes Dev

journal_title

Genes & development

authors

Umen JG,Goodenough UW

doi

10.1101/gad.892101

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

1652-61

issue

13

eissn

0890-9369

issn

1549-5477

journal_volume

15

pub_type

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