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Structural maintenance of chromosomes 3
External IDs OMIM606062 MGI1339795 HomoloGene3974 GeneCards: SMC3 Gene
RNA expression pattern
PBB GE SMC3 209259 s at tn.png
PBB GE SMC3 209257 s at tn.png
PBB GE SMC3 209258 s at tn.png
More reference expression data
Species Human Mouse
Entrez 9126 13006
Ensembl ENSG00000108055 ENSMUSG00000024974
UniProt Q9UQE7 Q9CW03
RefSeq (mRNA) NM_005445 NM_007790
RefSeq (protein) NP_005436 NP_031816
Location (UCSC) Chr 10:
110.57 – 110.6 Mb
Chr 19:
53.6 – 53.65 Mb
PubMed search [1] [2]

Structural maintenance of chromosomes 3, also known as SMC3, is a human gene.[1]


This gene belongs to the SMC3 subfamily of SMC proteins. The encoded protein occurs in certain cell types as either an intracellular, nuclear protein or a secreted protein. The nuclear form, known as structural maintenance of chromosomes 3, is a component of the multimeric cohesin complex that holds together sister chromatids during mitosis, enabling proper chromosome segregation. Post-translational modification of the encoded protein by the addition of chondroitin sulfate chains gives rise to the secreted proteoglycan bamacan, an abundant basement membrane protein.[1]

Model organisms[edit]

Model organisms have been used in the study of SMC3 function. A conditional knockout mouse line, called Smc3tm1a(EUCOMM)Wtsi[9][10] was generated as part of the International Knockout Mouse Consortium program — a high-throughput mutagenesis project to generate and distribute animal models of disease to interested scientists.[11][12][13]

Male and female animals underwent a standardized phenotypic screen to determine the effects of deletion.[7][14] Twenty two tests were carried out on mutant mice and six significant abnormalities were observed.[7] No homozygous mutant embryos were identified during gestation, and thus none survived until weaning. The remaining tests were carried out on heterozygous mutant adult mice. Females had a higher than normal incidence of pre-wean death in their offspring, and also had a decreased body weight. Males heterozygotes displayed a shortened, upturned snout.[7][14]


SMC3 (gene) has been shown to interact with:

See also[edit]


  1. ^ a b "Entrez Gene: SMC3 structural maintenance of chromosomes 3". 
  2. ^ "Body weight data for Smc3". Wellcome Trust Sanger Institute. 
  3. ^ "Dysmorphology data for Smc3". Wellcome Trust Sanger Institute. 
  4. ^ "DEXA data for Smc3". Wellcome Trust Sanger Institute. 
  5. ^ "Salmonella infection data for Smc3". Wellcome Trust Sanger Institute. 
  6. ^ "Citrobacter infection data for Smc3". Wellcome Trust Sanger Institute. 
  7. ^ a b c d Gerdin AK (2010). "The Sanger Mouse Genetics Programme: High throughput characterisation of knockout mice". Acta Ophthalmologica 88: 925–7. doi:10.1111/j.1755-3768.2010.4142.x. 
  8. ^ Mouse Resources Portal, Wellcome Trust Sanger Institute.
  9. ^ "International Knockout Mouse Consortium". 
  10. ^ "Mouse Genome Informatics". 
  11. ^ Skarnes WC, Rosen B, West AP, Koutsourakis M, Bushell W, Iyer V, Mujica AO, Thomas M, Harrow J, Cox T, Jackson D, Severin J, Biggs P, Fu J, Nefedov M, de Jong PJ, Stewart AF, Bradley A (2011). "A conditional knockout resource for the genome-wide study of mouse gene function". Nature 474 (7351): 337–42. doi:10.1038/nature10163. PMC 3572410. PMID 21677750. 
  12. ^ Dolgin E (2011). "Mouse library set to be knockout". Nature 474 (7351): 262–3. doi:10.1038/474262a. PMID 21677718. 
  13. ^ Collins FS, Rossant J, Wurst W (2007). "A mouse for all reasons". Cell 128 (1): 9–13. doi:10.1016/j.cell.2006.12.018. PMID 17218247. 
  14. ^ a b van der Weyden L, White JK, Adams DJ, Logan DW (2011). "The mouse genetics toolkit: revealing function and mechanism". Genome Biol. 12 (6): 224. doi:10.1186/gb-2011-12-6-224. PMC 3218837. PMID 21722353. 
  15. ^ Shimizu K, Shirataki H, Honda T, Minami S, Takai Y (March 1998). "Complex formation of SMAP/KAP3, a KIF3A/B ATPase motor-associated protein, with a human chromosome-associated polypeptide". J. Biol. Chem. 273 (12): 6591–4. doi:10.1074/jbc.273.12.6591. PMID 9506951. 
  16. ^ a b Gupta K, Anand G, Yin X, Grove L, Prochownik EV (March 1998). "Mmip1: a novel leucine zipper protein that reverses the suppressive effects of Mad family members on c-myc". Oncogene 16 (9): 1149–59. doi:10.1038/sj.onc.1201634. PMID 9528857. 
  17. ^ a b Lee J, Iwai T, Yokota T, Yamashita M (July 2003). "Temporally and spatially selective loss of Rec8 protein from meiotic chromosomes during mammalian meiosis". J. Cell. Sci. 116 (Pt 13): 2781–90. doi:10.1242/jcs.00495. PMID 12759374. 
  18. ^ Kim ST, Xu B, Kastan MB (March 2002). "Involvement of the cohesin protein, Smc1, in Atm-dependent and independent responses to DNA damage". Genes Dev. 16 (5): 560–70. doi:10.1101/gad.970602. PMC 155347. PMID 11877376. 
  19. ^ Schmiesing JA, Ball AR, Gregson HC, Alderton JM, Zhou S, Yokomori K (October 1998). "Identification of two distinct human SMC protein complexes involved in mitotic chromosome dynamics". Proc. Natl. Acad. Sci. U.S.A. 95 (22): 12906–11. doi:10.1073/pnas.95.22.12906. PMC 23650. PMID 9789013. 
  20. ^ Gregson HC, Schmiesing JA, Kim JS, Kobayashi T, Zhou S, Yokomori K (Dec 2001). "A potential role for human cohesin in mitotic spindle aster assembly". J. Biol. Chem. 276 (50): 47575–82. doi:10.1074/jbc.M103364200. PMID 11590136. 

Further reading[edit]

External links[edit]