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SGOL1 (shugoshin-like 1 (S. pombe))

Written2013-04Tomoaki Kahyo, Haruhiko Sugimura
Department of Tumor Pathology, Hamamatsu University School of Medicine, Hamamatsu, Japan

(Note : for Links provided by Atlas : click)


Other namesNY-BR-85
LocusID (NCBI) 151648
Atlas_Id 50710
Location 3p24.3  [Link to chromosome band 3p24]
Location_base_pair Starts at and ends at bp from pter
Local_order Telomeric to ZNF385D (zinc finger protein 385D); centromeric to KAT2B (lysine acetyltransferase 2B).
Fusion genes
(updated 2016)
SGOL1 (3p24.3) / CERK (22q13.31)
Note The Sgo1 gene was identified in fission yeast as a factor protecting centromeric Rec8 from degradation during meiosis I, and human Sgo1 homolog, SGOL1, was identified as a homologue of yeast Sgo1 on databases (Kitajima et al., 2004).


  Figure 1. Scheme of SGOL1 transcript variants. Exon numbers are shown at the top. Red and yellow boxes indicate exons of CDS and UTR, respectively.
Description The SGOL1 gene is composed of 9 exons and spans 25698 bases.
Transcription Transcript variant A2 (NM_001012410) has the longest coding sequence and encodes a protein comprised of 561 aa. Transcript variant A1 (NM_001012409) lacks exon 9 and encodes a protein comprised of 527 aa. Typically, "SGOL1" corresponds to type A1 or A2. Transcript variant B2 (NM_001012412) lacks a large proportion of exon 6 and encodes a protein comprised of 309 aa. Transcript B1 (NM_001012411) lacks exon 9 in addition to a large proportion of exon 6 and encodes a protein comprised of 275 aa. Transcript C2 (NM_138484) skips exon 6 and encodes a protein comprised of 292 aa. Transcript C1 (NM_001012413) lacks exon 9 in addition to exon 6 and encodes a protein comprised of 258 aa. Transcript D1 (NM_001199257) lacks exon 7 and exon 8 in addition to a large proportion of exon 6 and encodes a protein comprised of 215 aa. Transcript P1 (AB567656) lacks exon 3, resulting in leading to a stop codon within exon 4, and encodes a protein comprised of 59 aa. Furthermore, several transcript variants that have an alternate 5' UTR exon are also stored in databases (NM_001199251, NM_001199253, NM_001199255, NM_001199252, NM_001199254 and NM_001199256).
Pseudogene There are two pseudogenes on chromosome 1 (PGOHUM00000244068) and chromosome 7 (PGOHUM00000232695).


  Figure 2. Green, black and red boxes represent an N-terminal conserved coiled-coil region, a P-V-I motif and a C-terminal conserved basic region, respectively. Indicated numbers mean the exon numbers shown at Fig.1. SGOL1-interacting proteins are shown at the bottom.
Description SGOL1 protein (type A2) is a 64.2 kDa protein and has an N-terminal coiled-coil region, a P-V-I motif and a C-terminal conserved basic region. The N-terminal coiled-coil regions are required for the interaction with PP2A (Yamagishi et al., 2008) and the chromosomal passenger complex (CPC) (Tsukahara et al., 2010) at centromere. The P-V-I motif and the C-terminal basic region of SGOL1 are required for the interaction with HP1 (heterochromatin protein 1) and phosphorylated histone H2A at centromere, respectively (Yamagishi et al., 2008; Kawashima et al., 2010).
Expression Serum antibodies against NY-BR-85, which encodes SGOL1, are detected in breast cancer patients, and the expression of NY-BR-85 mRNA was detected in several tissues, including thymus and testis (Scanlan et al., 2001). Expression of SGOL1 was also detected in the extraction of HeLa cells (Salic et al., 2004; Kitajima et al., 2005) and various human leukemia cell lines (Yang et al., 2013), while the expression of SGOL1 was downregulated in the colorectal cancers (Iwaizumi et al., 2009).
Localisation Nucleus. During prophase and metaphase, SGOL1 localizes to the inner centromere (Salic et al., 2004; Kitajima et al., 2005).
Function SGOL1 is a crucial factor to protect centromeric cohesin during mitosis and to maintain genomic stability in human cells. SGOL1-knockdown caused severe mitotic arrest and precocious separation of centromeric cohesion in HeLa cells (Salic et al., 2004; Kitajima et al., 2006) and HCT116 cells, resulting in chromosomal instability (Iwaizumi et al., 2009; Kahyo et al., 2011). In addition, SGOL1 was needed for the kinetochore localization of PLK1 and CENP-F in HeLa cells (Salic et al., 2004; Pouwels et al., 2007). Several short isoforms of SGOL1 showed aberrant cell phenotypes including unstable chromatid cohesion (Suzuki et al., 2006; Kahyo et al., 2011). These results suggest that the short isoforms of SGOL1 function as a negative factor to native SGOL1, and that abundant expression of the SGOL1 short isoforms can be responsible for chromosomal instability.
Homology The coiled-coil and basic regions of shugoshin or shugoshin-like proteins are highly conserved between different species (Kitajima et al., 2004). SGOL2, a paralogue of SGOL1, was required for the PP2A-mediated protection of cohesin and the MCAK-mediated chromosome congression in HeLa cells (Tanno et al., 2010).


Somatic Losses of heterozygosity at several polymorphic markers in SGOL1 locus (c.416+39_42delGAAA, c.504A>T and c.1461C>T) were detected in 31.2 % of human colorectal cancers (Iwaizumi et al., 2009).

Implicated in

Entity Breast cancer
Note NY-BR-85 is a serologically defined breast cancer antigen (Scanlan et al., 2001). NY-BR-86 was overexpressed in 90% of breast cancers.
Entity Colorectal cancer
Note The expression of SGOL1 was significantly downregulated in the colorectal cancer tissue in comparison with the paired normal mucosa, and the tumors in the SGOL1-downregulated group tended to be located on the left side of the large bowel, especially in the rectum, rather than in the other regions of the large bowel (Iwaizumi et al., 2009). The mRNA of the shortest isoform SGOL1-P1, the overexpression of which caused unstable chromatid cohesion in HCT116 cells, was detected specifically in colorectal cancer tissues (Kahyo et al., 2011).
Oncogenesis While Sgo1 homozygous mutant mice (Sgo1-/-) showed embryonic lethality, Sgo1 heterozygous mice (Sgo1+/-) showed an increase in formation of colonic aberrant crypt foci and accelerated development of colon tumors after exposure to azoxymethane, a colon carcinogen (Yamada et al., 2012).
Entity Hematological malignancies
Note SGOL1 was aberrantly expressed in various human leukemia cell lines and freshly isolated leukemia cells. SGOL1-knockdown suppressed the cell proliferation in several leukemia cell lines (Yang et al., 2013).


Humoral immunity to human breast cancer: antigen definition and quantitative analysis of mRNA expression.
Scanlan MJ, Gout I, Gordon CM, Williamson B, Stockert E, Gure AO, Jager D, Chen YT, Mackay A, O'Hare MJ, Old LJ.
Cancer Immun. 2001 Mar 30;1:4.
PMID 12747765
The conserved kinetochore protein shugoshin protects centromeric cohesion during meiosis.
Kitajima TS, Kawashima SA, Watanabe Y.
Nature. 2004 Feb 5;427(6974):510-7. Epub 2004 Jan 18.
PMID 14730319
Vertebrate shugoshin links sister centromere cohesion and kinetochore microtubule stability in mitosis.
Salic A, Waters JC, Mitchison TJ.
Cell. 2004 Sep 3;118(5):567-78.
PMID 15339662
Human Bub1 defines the persistent cohesion site along the mitotic chromosome by affecting Shugoshin localization.
Kitajima TS, Hauf S, Ohsugi M, Yamamoto T, Watanabe Y.
Curr Biol. 2005 Feb 22;15(4):353-9.
PMID 15723797
Shugoshin collaborates with protein phosphatase 2A to protect cohesin.
Kitajima TS, Sakuno T, Ishiguro K, Iemura S, Natsume T, Kawashima SA, Watanabe Y.
Nature. 2006 May 4;441(7089):46-52. Epub 2006 Mar 15.
PMID 16541025
Human Shugoshin mediates kinetochore-driven formation of kinetochore microtubules.
Suzuki H, Akiyama N, Tsuji M, Ohashi T, Saito S, Eto Y.
Cell Cycle. 2006 May;5(10):1094-101. Epub 2006 May 15.
PMID 16687935
Shugoshin 1 plays a central role in kinetochore assembly and is required for kinetochore targeting of Plk1.
Pouwels J, Kukkonen AM, Lan W, Daum JR, Gorbsky GJ, Stukenberg T, Kallio MJ.
Cell Cycle. 2007 Jul 1;6(13):1579-85. Epub 2007 May 16.
PMID 17617734
Heterochromatin links to centromeric protection by recruiting shugoshin.
Yamagishi Y, Sakuno T, Shimura M, Watanabe Y.
Nature. 2008 Sep 11;455(7210):251-5. doi: 10.1038/nature07217.
PMID 18716626
Human Sgo1 downregulation leads to chromosomal instability in colorectal cancer.
Iwaizumi M, Shinmura K, Mori H, Yamada H, Suzuki M, Kitayama Y, Igarashi H, Nakamura T, Suzuki H, Watanabe Y, Hishida A, Ikuma M, Sugimura H.
Gut. 2009 Feb;58(2):249-60. doi: 10.1136/gut.2008.149468. Epub 2008 Jul 17.
PMID 18635744
Phosphorylation of H2A by Bub1 prevents chromosomal instability through localizing shugoshin.
Kawashima SA, Yamagishi Y, Honda T, Ishiguro K, Watanabe Y.
Science. 2010 Jan 8;327(5962):172-7. doi: 10.1126/science.1180189. Epub 2009 Nov 19.
PMID 19965387
Phosphorylation of mammalian Sgo2 by Aurora B recruits PP2A and MCAK to centromeres.
Tanno Y, Kitajima TS, Honda T, Ando Y, Ishiguro K, Watanabe Y.
Genes Dev. 2010 Oct 1;24(19):2169-79. doi: 10.1101/gad.1945310.
PMID 20889715
Phosphorylation of the CPC by Cdk1 promotes chromosome bi-orientation.
Tsukahara T, Tanno Y, Watanabe Y.
Nature. 2010 Oct 7;467(7316):719-23. doi: 10.1038/nature09390. Epub 2010 Aug 25.
PMID 20739936
A novel tumor-derived SGOL1 variant causes abnormal mitosis and unstable chromatid cohesion.
Kahyo T, Iwaizumi M, Shinmura K, Matsuura S, Nakamura T, Watanabe Y, Yamada H, Sugimura H.
Oncogene. 2011 Nov 3;30(44):4453-63. doi: 10.1038/onc.2011.152. Epub 2011 May 2.
PMID 21532624
Haploinsufficiency of SGO1 results in deregulated centrosome dynamics, enhanced chromosomal instability and colon tumorigenesis.
Yamada HY, Yao Y, Wang X, Zhang Y, Huang Y, Dai W, Rao CV.
Cell Cycle. 2012 Feb 1;11(3):479-88. doi: 10.4161/cc.11.3.18994. Epub 2012 Feb 1.
PMID 22262168
A novel treatment strategy targeting shugoshin 1 in hematological malignancies.
Yang J, Ikezoe T, Nishioka C, Yokoyama A.
Leuk Res. 2013 Jan;37(1):76-82. doi: 10.1016/j.leukres.2012.10.002. Epub 2012 Oct 24.
PMID 23102702


This paper should be referenced as such :
Kahyo, T ; Sugimura, H. SGOL1 (shugoshin-like 1 (S
Atlas Genet Cytogenet Oncol Haematol. 2013;17(11):746-748.
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External links

Genomic and cartography
Gene and transcription
RefSeq transcript (Entrez)
RefSeq genomic (Entrez)
SOURCE (Princeton)Expression in : [Datasets]   [Normal Tissue Atlas]  [carcinoma Classsification]  [NCI60]
BioGPS (Tissue expression)151648
Protein : pattern, domain, 3D structure
Domain families : Pfam (Sanger)
Domain families : Pfam (NCBI)
Protein Interaction databases
Ontologies - Pathways
Clinical trials, drugs, therapy
canSAR (ICR) (select the gene name)
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