Document Detail

The Y chromosome in the liverwort Marchantia polymorpha has accumulated unique repeat sequences harboring a male-specific gene.
MedLine Citation:
PMID:  11481501     Owner:  NLM     Status:  MEDLINE    
The haploid liverwort Marchantia polymorpha has heteromorphic sex chromosomes, an X chromosome in the female and a Y chromosome in the male. We here report on the repetitive structure of the liverwort Y chromosome through the analysis of male-specific P1-derived artificial chromosome (PAC) clones, pMM4G7 and pMM23-130F12. Several chromosome-specific sequence elements of approximately 70 to 400 nt are combined into larger arrangements, which in turn are assembled into extensive Y chromosome-specific stretches. These repeat sequences contribute 2-3 Mb to the Y chromosome based on the observations of three different approaches: fluorescence in situ hybridization, dot blot hybridization, and the frequency of clones containing the repeat sequences in the genomic library. A novel Y chromosome-specific gene family was found embedded among these repeat sequences. This gene family encodes a putative protein with a RING finger motif and is expressed specifically in male sexual organs. To our knowledge, there have been no other reports for an active Y chromosome-specific gene in plants. The chromosome-specific repeat sequences possibly contribute to determining the identity of the Y chromosome in M. polymorpha as well as to maintaining genes required for male functions, as in mammals such as human.
S Okada; T Sone; M Fujisawa; S Nakayama; M Takenaka; K Ishizaki; K Kono; Y Shimizu-Ueda; T Hanajiri; K T Yamato; H Fukuzawa; A Brennicke; K Ohyama
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  98     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2001 Jul 
Date Detail:
Created Date:  2001-08-01     Completed Date:  2001-08-30     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9454-9     Citation Subset:  IM    
Laboratory of Plant Molecular Biology, Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto 606-8502, Japan.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/AB062741;  AB062742;  AB062743
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MeSH Terms
Amino Acid Sequence
Angiosperms / genetics*
Base Sequence
Chromosome Mapping
Chromosomes, Artificial
DNA, Plant
In Situ Hybridization, Fluorescence
Molecular Sequence Data
Open Reading Frames
Polymerase Chain Reaction
Sequence Homology, Amino Acid
Y Chromosome*
Reg. No./Substance:
0/DNA, Plant

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