miRNA Entry for MI0000063

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The Let-7 microRNA precursor was identified from a study of developmental timing in C. elegans, and was later shown to be part of a much larger class of non-coding RNAs termed microRNAs. miR-98 microRNA precursor from human is a let-7 family member. Let-7 miRNAs have now been predicted or experimentally confirmed in a wide range of species (MIPF000002). miRNAs are initially transcribed in long transcripts (up to several hundred nucleotides) called primary miRNAs (pri-miRNAs), which are processed in the nucleus by Drosha and Pasha to hairpin structures of about ~70 nucleotide. These precursors (pre-miRNAs) are exported to the cytoplasm by exportin5, where they are subsequently processed by the enzyme Dicer to a ~22 nucleotide mature miRNA. The involvement of Dicer in miRNA processing demonstrates a relationship with the phenomenon of RNA interference.

let-7 microRNA precursor

Predicted secondary structure and sequence conservation of let-7
Identifiers
Symbol	let-7
Rfam	RF00027
miRBase	MI0000001
miRBase family	MIPF0000002
Other data
RNA type	Gene; miRNA
Domain(s)	Eukaryota
GO	0035195 0035068
SO	0001244

The Let-7 microRNA precursor was identified from a study of developmental timing in C. elegans,^[1] and was later shown to be part of a much larger class of non-coding RNAs termed microRNAs.^[2] miR-98 microRNA precursor from human is a let-7 family member. Let-7 miRNAs have now been predicted or experimentally confirmed in a wide range of species (MIPF000002). miRNAs are initially transcribed in long transcripts (up to several hundred nucleotides) called primary miRNAs (pri-miRNAs), which are processed in the nucleus by Drosha and Pasha to hairpin structures of about ~70 nucleotide. These precursors (pre-miRNAs) are exported to the cytoplasm by exportin5, where they are subsequently processed by the enzyme Dicer to a ~22 nucleotide mature miRNA. The involvement of Dicer in miRNA processing demonstrates a relationship with the phenomenon of RNA interference.

1 Genomic Locations
2 The let-7 family
3 Regulation of expression
- 3.1 By pluripotency promoting factor LIN28
- 3.2 In autoregulatory loop with MYC
4 Targets of let-7
5 Potential clinical use in cancer
- 5.1 Diagnosis
- 5.2 Therapy
6 References
7 Further reading
8 External links

[edit] Genomic Locations

In human genome, the cluster let-7a-1/let-7f-1/let-7d is inside the region B at 9q22.3, with the defining marker D9S280-D9S1809. One minimal LOH (loss of heterozygosity) region, between loci D11S1345-D11S1316, contains the cluster miR-125b1/let-7a-2/miR-100. The cluster miR-99a/let-7c/miR-125b-2 is in a 21p11.1 region of HD (homozygous deletions). The cluster let-7g/miR-135-1 is in region 3 at 3p21.1-p21.2.^[3]

[edit] The let-7 family

The lethal-7 (let-7) gene was first discovered in the nematode as a key developmental regulator and became one of the first two known microRNAs (the other one is lin-4).^[4] Soon, let-7 was found in fruit fly, and identified as the first known human miRNA by a BLAST (basic local alignment search tool) research.^[5] The mature form of let-7 family members is highly conserved across species.

[edit] In C.elegans

In C.elegans, the let-7 family consists of genes encoding nine miRNAs sharing the same seed sequence.^[6] Among them, let-7, mir-84, mir-48 and mir-241 are involved in C.elegans heterochronic pathway, sequentially controlling developmental timing of larva transitions.^[7] Most animals with loss-of-function let-7 mutation burst through their vulvas and die, and therefore the mutant is lethal (let).^[4] The mutants of other let-7 family members have a radio-resistant phenotype in vulval cells, which may be related to their ability to repress RAS.^[8]

[edit] In Drosophila

There is only one single let-7 gene in the Drosophila genome, which has the identical mature sequence to the one in C.elegans.^[9] The role of let-7 has been demonstrated in regulating the timing of neuromuscular junction formation in the abdomen and cell-cycle in the wing.^[10] Furthermore, the expression of pri-, pre- and mature let-7 have the same rhythmic pattern with the hormone pulse before each cuticular molt in Drosophila.^[11]

[edit] In vertebrates

The let-7 family has a lot more members in vertebrates than in C.elegans and Drosophila.^[9] And the sequences, expression timing, as well as genomic clustering of these miRNAs members are all conserved across species.^[12] The direct role of let-7 family in vertebrate development has not been clearly shown as in less complex organisms, yet the expression pattern of let-7 family is indeed temporal during developmental processes.^[13] Given that the expression levels of let-7 members are significantly low in human cancers and cancer stem cells,^[14] the major function of let-7 genes may be to promote terminal differentiation in development and tumor suppression.

[edit] Regulation of expression

Although the levels of mature let-7 members are undetectable in undifferentiated cells, the primary transcripts and the hairpin precursors of let-7 are present in these cells.^[15] It indicates that the mature let-7 miRNAs may be regulated in a post-transcriptional manner.

[edit] By pluripotency promoting factor LIN28

As one of the four genes involved in induced pluripotent stem (iPS) cells reprogramming,^[16] LIN28 expression is reciprocal to that of mature let-7.^[17] LIN28 selectively binds the primary and precursor forms of let-7, and inhibits the processing of pri-let-7 to form the hairpin precursor.^[18] This binding is facilitated by the conserved loop sequence of primary let-7 family members and RNA-binding domains of LIN28 proteins.^[19] On the other hand, let-7 miRNAs in mammals have been shown to regulate LIN28,^[20] which implies that let-7 might enhance its own level by repressing LIN28, its negative regulator.

[edit] In autoregulatory loop with MYC

Expression of let-7 members is controlled by MYC binding to their promoters. The levels of let-7 have been reported to decrease in models of MYC-mediated tumorigenesis, and to increase when MYC is inhibited by chemicals.^[21] In a twist, there are let-7-binding sites in MYC 3' untranslated region(UTR) according to bioinformatic analysis, and let-7 overexpression in cell culture decreased MYC mRNA levels.^[22] Therefore, there is a double-negative feedback loop between MYC and let-7. Furthermore, let-7 could lead to IMP1(/insulin-like growth factor II mRNA-binding protein) depletion, which destabilizes MYC mRNA, thus forming an indirect regulatory pathway.^[23]

[edit] Targets of let-7

[edit] Oncogenes: RAS, HMGA2

Let-7 has been demonstrated to be a direct regulator of RAS expression in human cells^[24] All the three RAS genes in human, K-, N-, and H-, have the predicted let-7 binding sequences in their 3'UTRs. In lung cancer patient samples, expression of RAS and let-7 showed reciprocal pattern, which has low let-7 and high RAS in cancerous cells, and high let-7 and low RAS in normal cells. Another oncogene, high mobility group A2 (HMGA2), has also been identified as a target of let-7. Let-7 directly inhibits HMGA2 by binding to its 3'UTR.^[25] Removal of let-7 binding site by 3'UTR deletion cause overexpression of HMGA2 and formation of tumor. MYC is also considered as a oncogenic target of let-7.

[edit] Cell cycle, proliferation, and apoptosis regulators

Microarray analyses revealed many genes regulating cell cycle and cell proliferation that are responsive to alteration of let-7 levels, including cyclin A2, CDC34, Aurora A and B kinases (STK6 and STK12), E2F5, and CDK8, among others.^[26] Subsequent experiments confirmed the direct effects of some of these genes, such as CDC25A and CDK6.^[27] Let-7 also inhibits several components of DNA replication machinery, transcription factors, even some tumor suppressor genes and checkpoint regulators.^[26] Apoptosis is regulated by let-7 as well, through Casp3, Bcl2, Map3k1 and Cdk5 modulation.^[28]

[edit] Immunity

Let-7 has been implicated in post-transcriptional control of innate immune responses to pathogenic agents. Macrophages stimulated with live bacteria or purified microbial components down-regulate the expression of several members of the let-7 microRNA family to relieve repression of immune-modulatory cytokines IL-6 and IL-10.^[29]^[30] Let-7 has also been implicated in the negative regulation of TLR4, the major immune receptor of microbial lipopolysaccharide and down-regulation of let-7 both upon microbial and protozoan infection might elevate TLR4 signalling and expression.^[31]^[32] Let-7 has furthermore been reported to regulate the production of cytokine IL-13 by T lymphocytes during allergic airway inflammation thus linking this microRNA to adaptive immunity as well.^[33] Down-modulation of let-7 negative regulator Lin28b in human T lymphocytes is believed to accure during early neonate development to reprogramm the immune system towards defense.^[34]

[edit] Potential clinical use in cancer

Given the prominent phenotype of cell overproliferation and undifferentiation by let-7 loss-of-function in nematodes, and the role of its targets on cell destiny determination, let-7 is closely associated with human cancer and acts as a tumor suppressor.

[edit] Diagnosis

Numerous reports have shown that the expression levels of let-7 are frequently low and the chromosomal clusters of let-7 are often deleted in many cancers.^[3] Let-7 is expressed at higher levels in more differentiated tumors, which also have lower levels of activated oncogenes such as RAS and HMGA2. Therefore, expression levels of let-7 could be prognostic markers in several cancers associated with differentiation stages.^[35] In lung cancer, for example, reduced expression of let-7 is significantly correlated with reduced postoperative survival.^[36]

[edit] Therapy

Let-7 is also a very attractive potential therapeutic that can prevent tumorigenesis and angiogenesis, typically in cancers that underexpress let-7.^[37] Lung cancer, for instance, have several key oncogenic mutations including p53, RAS and MYC, part of which may directly correlates with the reduced expression of let-7, and may be repressed by introduction of let-7.^[36] Intranasal administration of let-7 has already be found effective in reducing tumor growth in a transgenic mouse model of lung cancer.^[38] Similar restoration of let-7 was also shown to inhibit cell proliferation in breast, colon and hepatic cancers, lymphoma, and uterine leiomyoma.^[39]

[edit] References

^ Rougvie, AE (2001). "Control of developmental timing in animals". Nat Rev Genet 2 (9): 690–701. doi:10.1038/35088566. PMID 11533718.
^ Ambros, V (2001). "microRNAs: tiny regulators with great potential". Cell 107 (7): 823–826. doi:10.1016/S0092-8674(01)00616-X. PMID 11779458.
^ ^a ^b Calin; Sevignani, C; Dumitru, CD; Hyslop, T; Noch, E; Yendamuri, S; Shimizu, M; Rattan, S et al. (2003). "Human microRNA genes are frequently located at fragile sites and genomic regions involved in cancers". PNAS 101 (9): 2999–3004. Bibcode:2004PNAS..101.2999C. doi:10.1073/pnas.0307323101. PMC 365734. PMID 14973191.
^ ^a ^b Reinhart B.J. et al. (2000). "The 21-nucleotide let-7 RNA regulates developmental timing in Caenorhabditis elegans". Nature 403 (6772): 901–906. Bibcode:2000Natur.403..901R. doi:10.1038/35002607. PMID 10706289.
^ Pasquinelli A.E. et al. (2000). "Conservation of the sequence and temporal expression of let-7 heterochronic regulatory RNA". Nature 408 (6808): 86–89. doi:10.1038/35040556. PMID 11081512.
^ Lim L.P. et al. (2003). "The microRNAs of Caenorhabditis elegans". Genes Dev 17: 991–1008.
^ Moss, E.G. (2007) Heterochronic genes and the nature of developmental time" Curr. Biol 17: R425–R434.
^ Weidhaas J.B. et al. (2007). "MicroRNAs as potential agents to alter resistance to cytotoxic anticancer therapy". Cancer Res. 67 (23): 11111–11116. doi:10.1158/0008-5472.CAN-07-2858. PMID 18056433.
^ ^a ^b Lagos-Quintana M. et al. (2001). "Identification of novel genes coding for small expressed RNAs". Science 294 (5543): 853–858. Bibcode:2001Sci...294..853L. doi:10.1126/science.1064921. PMID 11679670.
^ Caygill E.E., Johnston L.A. (2008). "Temporal Regulation of Metamorphic Processes in Drosophila by the let-7 and miR-125 Heterochronic MicroRNAs". Curr. Biol. 18 (13): 943–950. doi:10.1016/j.cub.2008.06.020. PMC 2736146. PMID 18571409.
^ Thummel C.S. (2001). "Molecular mechanisms of developmental timing in C. elegans and Drosophila". Dev. Cell 1 (4): 453–465. doi:10.1016/S1534-5807(01)00060-0. PMID 11703937.
^ Rodriguez A. et al. (2004). "Identification of Mammalian microRNA Host Genes and Transcription Units". Genome Res. 14 (10A): 1902–1910. doi:10.1101/gr.2722704. PMC 524413. PMID 15364901.
^ Kloosterman W.P., Plasterk R.H. (2006). "The diverse functions of microRNAs in animal development and disease". Dev. Cell 11 (4): 441–450. doi:10.1016/j.devcel.2006.09.009. PMID 17011485.
^ Esquela-Kerscher A., Slack F.J. (2006). "Oncomirs - microRNAs with a role in cancer". Nat. Rev. Cancer 6 (4): 259–269. doi:10.1038/nrc1840. PMID 16557279.
^ Thomson J.M. et al. (2006). "Extensive post-transcriptional regulation of microRNAs and its implications for cancer". Genes Dev. 20 (16): 2202–2207. doi:10.1101/gad.1444406. PMC 1553203. PMID 16882971.
^ Yu J. et al. (2007). "Induced pluripotent stem cell lines derived from human somatic cells". Science 318 (5858): 1917–1920. Bibcode:2007Sci...318.1917Y. doi:10.1126/science.1151526. PMID 18029452.
^ Viswanathan S.R. et al. (2008). "Selective blockade of microRNA processing by Lin-28". Science 320 (5872): 97–100. Bibcode:2008Sci...320...97V. doi:10.1126/science.1154040. PMID 18292307.
^ Newman, M.A. et al. (2008) Lin-28 interaction with the let-7 precursor loop mediates regulated microRNA processing. RNA, doi:10.1261/rna.1155108.
^ Piskounova, E. et al. (2008) Determinants of microRNA processing inhibition by the developmentally regulated RNA-binding protein Lin28. J. Biol. Chem., doi:10.1074/jbc.C800108200.
^ Moss E.G., Tang L. (2003). "Conservation of the heterochronic regulator Lin-28, its developmental expression and microRNA complementary sites". Dev. Biol. 258 (2): 432–442. doi:10.1016/S0012-1606(03)00126-X. PMID 12798299.
^ Chang T.C. et al. (2007). "Widespread microRNA repression by Myc contributes to tumorigenesis". Nat. Genet 40 (1): 43–50. doi:10.1038/ng.2007.30. PMC 2628762. PMID 18066065.
^ Koscianska E. et al. (2007). "Prediction and preliminary validation of oncogene regulation by miRNAs". BMC Mol. Biol. 8: 79. doi:10.1186/1471-2199-8-79. PMC 2096627. PMID 17877811.
^ Ioannidis P. et al. (2005). "CRD-BP/IMP1 expression characterizes cord blood CD34+ stem cells and affects c-myc and IGF-II expression in MCF-7 cancer cells". J. Biol. Chem. 280 (20): 20086–20093. doi:10.1074/jbc.M410036200. PMID 15769738.
^ Johnson S.M. et al. (2005). "RAS is regulated by the let-7 microRNA family". Cell 120 (5): 635–647. doi:10.1016/j.cell.2005.01.014. PMID 15766527.
^ Mayr C. et al. (2007). "Disrupting the Pairing Between let-7 and Hmga2 Enhances Oncogenic Transformation". Science 315 (5818): 1576–1579. Bibcode:2007Sci...315.1576M. doi:10.1126/science.1137999. PMC 2556962. PMID 17322030.
^ ^a ^b Johnson SM, Grosshans H, Shingara J et al. (2005). "Ras is regulated by the let-7 microrna family". Cell 120 (5): 635–47. doi:10.1016/j.cell.2005.01.014. PMID 15766527.
^ Johnson C.D. et al. (2007). "The let-7 microRNA represses cell proliferation pathways in human cells". Cancer Res. 67 (16): 7713–7722. doi:10.1158/0008-5472.CAN-07-1083. PMID 17699775.
^ He YJ, Guo L, D ZH. (2009) Let-7 and mir-24 in uvb-induced apoptosis [Chinese]. Zhonghua Fang She Yi Xue Yu Fang Hu Za Zhi. 29, 234–6.
^ Schulte LN et al. (2011). "Analysis of the host miRNA response to Salmonella uncovers the control of major cytokines by the let-7 family". The Embo Journal 30 (10): 1977–1989. doi:10.1038/emboj.2011.94.
^ Liu Y et al. (2011). "MicroRNA-98 negatively regulates IL-10 production and endotoxin tolerance in macrophages after LPS stimulation". FEBS Letters 585 (12): 1963–1968. doi:10.1016/j.febslet.2011.05.029.
^ Hu G et al. (2009). "MicroRNA-98 and let-7 Confer Cholangiocyte Expression of Cytokine-Inducible Src Homology 2-Containing Protein in Response to Microbial Challenge". The Journal of Immunology 183 (3): 1617–1624. doi:10.4049/jimmunol.0804362. PMC 2906382. PMID 19592657.
^ Androulidaki A et al. (2009). "Akt1 controls macrophage response to LPS by regulating microRNAs". Immunity 31 (2): 220–231. doi:10.1016/j.immuni.2009.06.024.
^ Kumar M et al. (2011). "Let-7 microRNA-mediated regulation of IL-13 and allergic airway inflammation". Journal of Allergy and Clinical Immunology 128 (5): 1077–1085. doi:10.1016/j.jaci.2011.04.034.
^ Yuan J et al. (2012). "Lin28b Reprograms Adult Bone Marrow Hematopoietic Progenitors to Mediate Fetal-Like Lymphopoiesis". Science 335 (6073): 1195–12000. Bibcode:2012Sci...335.1195Y. doi:10.1126/science.1216557.
^ Shell S, Park SM, Radjabi AR et al. (2007). "Let-7 expression defines two differentiation stages of cancer". Proc Natl Acad Sci U S A 104 (27): 11400–5. Bibcode:2007PNAS..10411400S. doi:10.1073/pnas.0704372104. PMC 2040910. PMID 17600087.
^ ^a ^b Takamizawa J, Konishi H, Yanagisawa K et al. (2004). "Reduced expression of the let-7 micrornas in human lung cancers in association with shortened postoperative survival". Cancer Res. 64 (11): 3753–6. doi:10.1158/0008-5472.CAN-04-0637. PMID 15172979.
^ Kuehbacher A, Urbich C, Zeiher AM, Dimmeler S (2007). "Role of Dicer and Drosha for endothelial microrna expression and angiogenesis". Circ Res 101 (1): 59–68. doi:10.1161/CIRCRESAHA.107.153916. PMID 17540974.
^ Esquela , Kerscher A, Trang P, Wiggins JF et al. (2008). "The let-7 microrna reduces tumor growth in mouse models of lung cancer". Cell Cycle 7 (6): 759–64. doi:10.4161/cc.7.6.5834. PMID 18344688.
^ Barh D., Malhotra R., Ravi B., and Sindhurani P. (2010). MicroRNA let-7: an emerging next-generation cancer therapeutic. CURRENT ONCOLOGY. 17, 70-80.

[edit] Further reading

^ Dangi-Garimella S, Strouch MJ, Grippo PJ, Bentrem DJ, Munshi HG (2010). "Collagen regulation of let-7 in pancreatic cancer involves TGF-β1-mediated membrane type 1-matrix metalloproteinase expression". Oncogene 30 (8): 1002–1008. doi:10.1038/onc.2010.485. PMC 3172057. PMID 21057545.
^ Yang X, Lin X, Zhong X, Kaur S, Li N, Liang S, Lassus H, Wang L, Katsaros D, Montone K, Zhao X, Zhang Y, BÃ¼tzow R, Coukos G, Zhang L (2010). "Double negative feedback loop between reprogramming factor LIN28 and microRNA let-7 regulates aldehyde dehydrogenase 1-positive cancer stem cells". Cancer Res 70 (22): 9463–9472. doi:10.1158/0008-5472.CAN-10-2388. PMC 3057570. PMID 21045151.
^ Ohshima K, Inoue K, Fujiwara A, Hatakeyama K, Kanto K, Watanabe Y, Muramatsu K, Fukuda Y, Ogura S, Yamaguchi K, Mochizuki T (2010). "Let-7 MicroRNA Family Is Selectively Secreted into the Extracellular Environment via Exosomes in a Metastatic Gastric Cancer Cell Line". In Wölfl, Stefan. PLoS ONE 5 (10): e13247. doi:10.1371/journal.pone.0013247. PMC 2951912. PMID 20949044.
^ Ramachandran R, Fausett BV, Goldman D (2010). "Ascl1a regulates Müller glia dedifferentiation and retina regeneration via a Lin-28-dependent, let-7 miRNA signaling pathway". Nat Cell Biol 12 (11): 1101–7. doi:10.1038/ncb2115. PMC 2972404. PMID 20935637.
^ Ruzzo A, Canestrari E, Galluccio N, Santini D, Vincenzi B, Tonini G, Magnani M, Graziano F (2010). "Role of KRAS let-7 LCS6 SNP in metastatic colorectal cancer patients". Ann Oncol 22 (1): 234–5. doi:10.1093/annonc/mdq472. PMID 20926546.
^ Garbuzov A, Tatar M (2010). "Hormonal regulation of Drosophila microRNA let-7 and miR-125 that target innate immunity". Fly (Austin) 4 (4): 306–11. doi:10.4161/fly.4.4.13008. PMC 3174482. PMID 20798594.
^ Ji J, Wang XW (2010). "A Yin-Yang Balancing Act of the Lin28/Let-7 Link in Tumorigenesis". J Hepatol 53 (5): 974–5. doi:10.1016/j.jhep.2010.07.001. PMC 2949515. PMID 20739081.
^ Osada H, Takahashi T (2010). "Review Article: let-7 and miR-17-92: Small-sized major players in lung cancer development". Cancer Sci 102 (1): 9–17. doi:10.1111/j.1349-7006.2010.01707.x. PMID 20735434.
^ He Y, Yang C, Kirkmire CM, Wang ZJ (2010). "Regulation of opioid tolerance by let-7 family microRNA targeting the μ opioid receptor". J Neurosci 30 (30): 10251–8. doi:10.1523/JNEUROSCI.2419-10.2010. PMC 2943348. PMID 20668208.
^ Cevec M, Thibaudeau C, Plavec J (2010). "NMR structure of the let-7 miRNA interacting with the site LCS1 of lin-41 mRNA from Caenorhabditis elegans". Nucleic Acids Res 38 (21): 7814–21. doi:10.1093/nar/gkq640. PMC 2995062. PMID 20660479.
^ Nie K, Zhang T, Allawi H, Gomez M, Liu Y, Chadburn A, Wang YL, Knowles DM, Tam W (2010). "Epigenetic Down-Regulation of the Tumor Suppressor Gene PRDM1/Blimp-1 in Diffuse Large B Cell Lymphomas : A Potential Role of the MicroRNA Let-7". Am J Pathol 177 (3): 1470–9. doi:10.2353/ajpath.2010.091291. PMC 2928978. PMID 20651244.
^ Polikepahad S, Knight JM, Naghavi AO, Oplt T, Creighton CJ, Shaw C, Benham AL, Kim J, Soibam B, Harris RA, Coarfa C, Zariff A, Milosavljevic A, Batts LM, Kheradmand F, Gunaratne PH, Corry DB (2010). "Proinflammatory Role for let-7 MicroRNAS in Experimental Asthma". J Biol Chem 285 (39): 30139–49. doi:10.1074/jbc.M110.145698. PMC 2943272. PMID 20630862.
^ Newman MA, Hammond SM (2010). "Lin-28: an early embryonic sentinel that blocks Let-7 biogenesis". Int J Biochem Cell Biol 42 (8): 1330–3. doi:10.1016/j.biocel.2009.02.023. PMID 20619222.
^ Lee ST, Chu K, Oh HJ, Im WS, Lim JY, Kim SK, Park CK, Jung KH, Lee SK, Kim M, Roh JK (2010). "Let-7 microRNA inhibits the proliferation of human glioblastoma cells". J Neurooncol 102 (1): 19–24. doi:10.1007/s11060-010-0286-6. PMID 20607356.
^ Zhang W, Winder T, Ning Y, Pohl A, Yang D, Kahn M, Lurje G, Labonte MJ, Wilson PM, Gordon MA, Hu-Lieskovan S, Mauro DJ, Langer C, Rowinsky EK, Lenz HJ (2010). "A let-7 microRNA-binding site polymorphism in 3'-untranslated region of KRAS gene predicts response in wild-type KRAS patients with metastatic colorectal cancer treated with cetuximab monotherapy". Ann Oncol 22 (1): 104–9. doi:10.1093/annonc/mdq315. PMID 20603437.
^ Zhao Y, Deng C, Wang J, Xiao J, Gatalica Z, Recker RR, Xiao GG (2010). "Let-7 family miRNAs regulate estrogen receptor alpha signaling in estrogen receptor positive breast cancer". Breast Cancer Res Treat 127 (1): 69–80. doi:10.1007/s10549-010-0972-2. PMID 20535543.
^ Hu G, Zhou R, Liu J, Gong AY, Chen XM (2010). "MicroRNA-98 and let-7 Regulate Expression of Suppressor of Cytokine Signaling-4 in Biliary Epithelial Cells in Response to Cryptosporidium parvum Infection". J Infect Dis 202 (1): 125–35. doi:10.1086/653212. PMC 2880649. PMID 20486857.
^ Steinemann D, Tauscher M, Praulich I, Niemeyer CM, Flotho C, Schlegelberger B (2010). "Mutations in the let-7 binding site - a mechanism of RAS activation in juvenile myelomonocytic leukemia?". Haematologica 95 (9): 1616. doi:10.3324/haematol.2010.024984. PMC 2930968. PMID 20460640.
^ Wong TS, Man OY, Tsang CM, Tsao SW, Tsang RK, Chan JY, Ho WK, Wei WI, To VS (2010). "MicroRNA let-7 suppresses nasopharyngeal carcinoma cells proliferation through downregulating c-Myc expression". J Cancer Res Clin Oncol 137 (3): 415–422. doi:10.1007/s00432-010-0898-4. PMC 3036828. PMID 20440510.
^ Shimizu S, Takehara T, Hikita H, Kodama T, Miyagi T, Hosui A, Tatsumi T, Ishida H, Noda T, Nagano H, Doki Y, Mori M, Hayashi N (2010). "The let-7 family of microRNAs inhibits Bcl-xL expression and potentiates sorafenib-induced apoptosis in human hepatocellular carcinoma". J Hepatol 52 (5): 698–704. doi:10.1016/j.jhep.2009.12.024. PMID 20347499.
^ Jakymiw A, Patel RS, Deming N, Bhattacharyya I, Shah P, Lamont RJ, Stewart CM, Cohen DM, Chan EK (2010). "Overexpression of Dicer as a Result of Reduced let-7 microRNA Levels Contributes to Increased Cell Proliferation of Oral Cancer Cells". Genes Chromosomes Cancer 49 (6): 549–59. doi:10.1002/gcc.20765. PMC 2859695. PMID 20232482.
^ Koh W, Sheng CT, Tan B, Lee QY, Kuznetsov V, Kiang LS, Tanavde V (2010). "Analysis of deep sequencing microRNA expression profile from human embryonic stem cells derived mesenchymal stem cells reveals possible role of let-7 microRNA family in downstream targeting of Hepatic Nuclear Factor 4 Alpha". BMC Genomics. 11 Suppl 1: S6. doi:10.1186/1471-2164-11-S1-S6. PMC 2822534. PMID 20158877.
^ Barh D, Malhotra R, Ravi B, Sindhurani P (2010). "Microrna let-7: an emerging next-generation cancer therapeutic". Curr Oncol 17 (1): 70–80. PMC 2826782. PMID 20179807.
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[edit] External links

v t e miRNA precursor families

1-100	1 2 6 7 8/141/200 9/79 10 15 16 17 19 21 22 24 26 29 30 31 33 34 46/47/281 92 96

101-200	101 103/107 122 124 126 127 129 130 132 133 134 135 137 138 143 144 145 146 148/152 150 155 156 160 166 172 181 184 191 192/215 194 196 199 200

201+	203 205 208 210 214 218 219 221 223 224 296 338 395 399 433 451

Other	BART1 BART2 BHRF1-1 BHRF1-2 BHRF1-3 Let-7 Lin-4 Lsy-6

Mature sequence hsa-let-7b-5p
Accession	MIMAT0000063
Previous IDs	hsa-let-7b
Sequence	6 - ugagguaguagguugugugguu - 27 Get sequence
Deep sequencing	3805738 reads, 37 experiments
Evidence	experimental; cloned [1,3-5], Northern [1]
Validated targets	TARBASE:hsa-let-7b-5p
Predicted targets	DIANA-MICROT:hsa-let-7b-5p MICRORNA.ORG:hsa-let-7b-5p MIRDB:hsa-let-7b-5p RNA22-HSA:hsa-let-7b-5p TARGETMINER:hsa-let-7b-5p TARGETSCAN-VERT:hsa-let-7b PICTAR-VERT:hsa-let-7b

Mature sequence hsa-let-7b-3p
Accession	MIMAT0004482
Previous IDs	hsa-let-7b*
Sequence	60 - cuauacaaccuacugccuuccc - 81 Get sequence
Deep sequencing	1267 reads, 24 experiments
Evidence	experimental; cloned [4-5]
Predicted targets	DIANA-MICROT:hsa-let-7b-3p MICRORNA.ORG:hsa-let-7b-3p MIRDB:hsa-let-7b-3p RNA22-HSA:hsa-let-7b-3p TARGETMINER:hsa-let-7b-3p PICTAR-VERT:hsa-let-7b

References
1	PMID:11679670 "Identification of novel genes coding for small expressed RNAs" Lagos-Quintana M, Rauhut R, Lendeckel W, Tuschl T Science. 294:853-858(2001).
2	PMID:14573789 "Reduced accumulation of specific microRNAs in colorectal neoplasia" Michael MZ, O' Connor SM, van Holst Pellekaan NG, Young GP, James RJ Mol Cancer Res. 1:882-891(2003).
3	PMID:15325244 "Altered expression profiles of microRNAs during TPA-induced differentiation of HL-60 cells" Kasashima K, Nakamura Y, Kozu T Biochem Biophys Res Commun. 322:403-410(2004).
4	PMID:17604727 "A mammalian microRNA expression atlas based on small RNA library sequencing" Landgraf P, Rusu M, Sheridan R, Sewer A, Iovino N, Aravin A, Pfeffer S, Rice A, Kamphorst AO, Landthaler M, Lin C, Socci ND, Hermida L, Fulci V, Chiaretti S, Foa R, Schliwka J, Fuchs U, Novosel A, Muller RU, Schermer B, Bissels U, Inman J, Phan Q, Chien M Cell. 129:1401-1414(2007).
5	PMID:17616659 "Patterns of known and novel small RNAs in human cervical cancer" Lui WO, Pourmand N, Patterson BK, Fire A Cancer Res. 67:6031-6043(2007).

miRBase

Stem-loop sequence hsa-let-7b

Contents