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Results for “noncoding RNA”

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PubMed2025

TPX2 promotes papillary renal cell carcinoma progression by forming a ceRNA with LINC00894.

PURPOSE: Papillary renal cell carcinoma (pRCC), particularly type 2, is associated with a poor prognosis. This study aimed to identify molecular mechanisms underlying pRCC progression and explore potential therapeutic targets to improve patient outcomes. METHODS: TPX2 expression was analyzed in tumor samples from patients with type 2 pRCC. In vitro experiments were conducted to assess the effects of TPX2 and LINC00894 knockdown and overexpression on the proliferation and migration of Caki-2 and ACHN cells. Immunohistochemical analysis of tissue microarrays was performed to evaluate the associations between TPX2 expression and clinicopathological characteristics in type 2 pRCC patients. RESULTS: Elevated TPX2 expression was significantly associated with a worse prognosis in type 2 pRCC patients and served as an independent risk factor for overall survival. Knockdown of TPX2 in Caki-2 and ACHN cells significantly reduced cell proliferation and migration. Additionally, LINC00894 was highly expressed in type 2 pRCC and correlated with poor prognosis. Mechanistically, miR-660-5p targeted the TPX2 3' UTR, promoting TPX2 degradation, while LINC00894 competitively bound to miR-660-5p, protecting TPX2 from miRNA-mediated degradation and exerting a pro-oncogenic effect. Immunohistochemical analysis revealed significant correlations between TPX2 expression and clinicopathological features, including tumor thrombus volume, tumor diameter, pathological TNM stage, and Fuhrman grade. CONCLUSION: This study underscores the critical role of TPX2 in type 2 pRCC progression and highlights its potential as a prognostic biomarker and therapeutic target. The TPX2/LINC00894/miR-660-5p regulatory axis provides novel insights into the molecular mechanisms driving pRCC and offers a promising avenue for improving patient prognosis.

Humans↗

PubMed2002

Poliovirus internal ribosome entry segment structure alterations that specifically affect function in neuronal cells: molecular genetic analysis.

Translation of poliovirus RNA is driven by an internal ribosome entry segment (IRES) present in the 5' noncoding region of the genomic RNA. This IRES is structured into several domains, including domain V, which contains a large lateral bulge-loop whose predicted secondary structure is unclear. The primary sequence of this bulge-loop is strongly conserved within enteroviruses and rhinoviruses: it encompasses two GNAA motifs which could participate in intrabulge base pairing or (in one case) could be presented as a GNRA tetraloop. We have begun to address the question of the significance of the sequence conservation observed among enterovirus reference strains and field isolates by using a comprehensive site-directed mutagenesis program targeted to these two GNAA motifs. Mutants were analyzed functionally in terms of (i) viability and growth kinetics in both HeLa and neuronal cell lines, (ii) structural analyses by biochemical probing of the RNA, and (iii) translation initiation efficiencies in vitro in rabbit reticulocyte lysates supplemented with HeLa or neuronal cell extracts. Phenotypic analyses showed that only viruses with both GNAA motifs destroyed were significantly affected in their growth capacities, which correlated with in vitro translation defects. The phenotypic defects were strongly exacerbated in neuronal cells, where a temperature-sensitive phenotype could be revealed at between 37 and 39.5 degrees C. Biochemical probing of mutated domain V, compared to the wild type, demonstrated that such mutations lead to significant structural perturbations. Interestingly, revertant viruses possessed compensatory mutations which were distant from the primary mutations in terms of sequence and secondary structure, suggesting that intradomain tertiary interactions could exist within domain V of the IRES.

Amino Acid Motifs↗

PubMed2000

Mov34 protein from mouse brain interacts with the 3' noncoding region of Japanese encephalitis virus.

The plus-sense RNA genome of Japanese encephalitis virus (JEV) contains noncoding regions (NCRs) of 95 and 585 bases at its 5' and 3' ends, respectively. The last 83 nucleotides of the 3'-NCR are predicted to form stable stem-loop (SL) structures. The shape of this 3'-SL structure is highly conserved among divergent flaviviruses even though only small stretches of nucleotide sequence contained within these structures are conserved. These SL structures have been predicted to function as cis-acting signals for RNA replication and as such may bind to viral and cellular proteins that may be involved in viral replication. We have studied the interaction of the JEV 3'-NCR RNA with host proteins using gel retardation assays. We show that the JEV 3'-SL structure RNA forms three complexes with proteins from the S100 cytoplasmic extract prepared from the neonatal mouse brain. These complexes could be obtained in the presence of 200 mM KCl, indicating that the RNA-protein interaction may be physiologically relevant. UV-induced cross-linking and Northwestern blotting analyses detected three proteins with apparent molecular masses of 32, 35, and 50 kDa that bound to the JEV 3'-SL structure RNA. Screening of the neonatal mouse brain cDNA library with the JEV 3'-SL structure RNA identified a 36-kDa Mov34 protein interacting with it. Competition experiments using the RNA extracted from JEV virions established that the 36-kDa Mov34 protein indeed bound to the JEV genome. Murine Mov34 belongs to a family of proteins whose members have been shown to be involved in RNA transcription and translation. It is, therefore, likely that the murine Mov34 interaction with JEV 3'-NCR has a role in RNA replication.

3' Untranslated Regions↗

PubMed1985

Nucleotide sequence of cucumber mosaic virus RNA. 1. Presence of a sequence complementary to part of the viral satellite RNA and homologies with other viral RNAs.

The nucleotide sequence of the 3389 residues of RNA 1 (Mr 1.15 X 10(6) of the Q strain of cucumber mosaic virus (CMV) was determined, completing the primary structure of the CMV genome (8617 nucleotides). CMV RNA 1 was sequenced by the dideoxy-chain-termination method using M13 clones carrying RNA 1 sequences as well as synthetic oligonucleotide primers on RNA 1 as a template. At the 5' end of the RNA there are 97 noncoding residues between the cap structure and the first AUG (98-100), which is the start of a single long open-reading frame. This reading frame encodes a translation product of 991 amino acid residues (Mr 110791) and stops 319 nucleotide residues from the 3' end of RNA 1. In addition to the conserved 3' region present in all CMV RNAs (307 residues in RNA 1), RNAs 1 and 2 have highly homologous 5' leader sequences, a 12-nucleotide segment of which is also conserved in the corresponding RNAs of brome mosaic virus (BMV). CMV satellite RNA can form stable base pairs with a region of CMV RNAs 1 and 2 including this 12-nucleotide sequence, implying a regulatory function. This conserved sequence is part of a hairpin structure in RNAs 1 and 2 of CMV and BMV and in CMV satellite RNA. The entire translation products of RNA 1 of CMV and BMV could be aligned with significant homology. Less prominent homologies were found with alfalfa mosaic virus RNA 1 translation product and with tobacco mosaic virus Mr-126000 protein.

Amino Acid Sequence↗

PubMed2024

lncRNA TUG1 transcript levels and psychological disorders: insights into interplay of glycemic index and glycemic load.

BACKGROUND: There is an association between obesity and psychological disorders such as depression, anxiety, and stress. Environmental factors and genetics play a crucial role in this regard. Several long non-coding RNAs (lncRNAs) are involved in the pathophysiology of the nervous system. Additionally, we intend to investigate how dietary glycemic index and load relate to psychological disorders in women with obesity and overweight by identifying the possible interaction with metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) and taurine upregulated gene 1 (TUG1). METHODS: 267 overweight or obese women between the ages of 18 and 48 were recruited for the current study. A reliable and validated food frequency questionnaire (FFQ) consisting of 147 items assessed food consumption, glycemic load (GL), and glycemic index (GI). Depression-Anxiety-Stress Scales (DASS-21) were used to assess mental well-being. A real-time polymerase chain reaction (PCR) was used to assess transcript levels for lncRNAs MALAT1 and TUG1. RESULTS: In obese and overweight women, a positive correlation was found between anxiety and MALAT1 mRNA levels (P = 0.007, CC = 0.178). Age, energy intake, physical activity, total fat, income, marriage, thyroid, and BMI were adjusted, and GI and TUG1 were positively correlated on DASS-21 (β = 0.006, CI = 0.001, 0.01, P = 0.031), depression (β = 0.002, CI = 0.001, 0.004, P = 0.019), Stress (β = 0.003, CI = 0.001, 0.005, P = 0.027). The interaction of GL and TUG1 on stress was also observed (β = 0.03, CI = 0.001, 0.07, P = 0.048). CONCLUSIONS: The lncRNA TUG1 appears to be associated with depression and stress through interaction with GI and correlated with stress by interaction with GL. To establish this concept, further research is required.

RNA, Long Noncoding↗

PubMed2006

Host deadenylation-dependent mRNA decapping factors are required for a key step in brome mosaic virus RNA replication.

The genomes of positive-strand RNA [+RNA] viruses perform two mutually exclusive functions: they act as mRNAs for the translation of viral proteins and as templates for viral replication. A universal key step in the replication of +RNA viruses is the coordinated transition of the RNA genome from the cellular translation machinery to the viral replication complex. While host factors are involved in this step, their nature is largely unknown. By using the ability of the higher eukaryotic +RNA virus brome mosaic virus (BMV) to replicate in yeast, we previously showed that the host Lsm1p protein is required for efficient recruitment of BMV RNA from translation to replication. Here we show that in addition to Lsm1p, all tested components of the Lsm1p-7p/Pat1p/Dhh1p decapping activator complex, which functions in deadenylation-dependent decapping of cellular mRNAs, are required for BMV RNA recruitment for RNA replication. In contrast, other proteins of the decapping machinery, such as Edc1p and Edc2p from the deadenylation-dependent decapping pathway and Upf1p, Upf2p, and Upf3p from the deadenylation-independent decapping pathway, had no significant effects. The dependence of BMV RNA recruitment on the Lsm1p-7p/Pat1p/Dhh1p complex was linked exclusively to the 3' noncoding region of the BMV RNA. Collectively, our results suggest that the Lsm1p-7p/Pat1p/Dhh1p complex that transfers cellular mRNAs from translation to degradation might act as a key regulator in the switch from BMV RNA translation to replication.

Adenosine Monophosphate↗

PubMed1977

Sequence analysis of protamine mRNA from the rainbow trout. Depurination and nearest neighbor analysis of protamine cDNA.

Protamine cDNA, which was a full length copy of protamine mRNA was labeled during its synthesis by using deoxynucleoside [alpha-32P]triphosphates. Depurination analysis showed that there were 19 different pyrimidine oligonucleotides in protamine cDNA, some of which contained isomeric sequences. The stoichiometry of the pyrimidine oligonucleotides indicated that, while some sequences probably occur in each of the protamine mRNA components, other sequences are clearly absent from one or more of the components. Several of the pyrimidine oligonucleotides had sequences consistent with the amino acid sequences of the rainbow trout protamines. The longest oligopyrimidine tract, C7T4, had a complementary RNA sequence of AGGAGAGGAGG, a stoichiometry of close to 1, and fitted the amino acid sequence Arg-Arg-Gly-Gly which occurs near the COOH terminus of each of three major protamine components. Other pyrimidine oligonucleotides analyzed were complementary to RNA sequences from the noncoding region of protamine mRNA. There appears to be no preferential use of one particular arginine codon or set of codons. Of the 21 to 22 arginine codons in protamine mRNA no less than 7 and no more than 12 are of the CGX series. The other two codons, AGA and AGG, both occur but not in a series of more than two together. This indicates that the RNA sequences coding for the arginine tracts tend to contain a mixture of arginine codons. Nearest neighbor frequency analysis of protamine cDNA gives a low value for the frequency of the CpG doublet, despite its occurrence in four out of the six arginine codons. This is in accordance with the observation that the sequence CpG is surprisingly rare in vertebrate DNA and in the RNA transcribed from it.

Animals↗

PubMed2006

The X chromosome is organized into a gene-rich outer rim and an internal core containing silenced nongenic sequences.

We investigated whether genes escape X chromosome inactivation by positioning outside of the territory defined by XIST RNA. Results reveal an unanticipated higher order organization of genes and noncoding sequences. All 15 X-linked genes, regardless of activity, position on the border of the XIST RNA territory, which resides outside of the DAPI-dense Barr body. Although more strictly delineated on the inactive X chromosome (Xi), all genes localized predominantly to the outer rim of the Xi and active X chromosome. This outer rim is decorated only by X chromosome DNA paints and is excluded from both the XIST RNA and dense DAPI staining. The only DNA found well within the Barr body and XIST RNA territory was centromeric and Cot-1 DNA; hence, the core of the X chromosome essentially excludes genes and is composed primarily of noncoding repeat-rich DNA. Moreover, we show that this core of repetitive sequences is expressed throughout the nucleus yet is silenced throughout Xi, providing direct evidence for chromosome-wide regulation of "junk" DNA transcription. Collective results suggest that the Barr body, long presumed to be the physical manifestation of silenced genes, is in fact composed of a core of silenced noncoding DNA. Instead of acting at a local gene level, XIST RNA appears to interact with and silence core architectural elements to effectively condense and shut down the Xi.

Chromatin↗

PubMed2026

Identification of a necroptosis-related lncRNA prognostic signature and the hub RBP HNRNPK in esophageal squamous cell carcinoma.

ObjectiveEsophageal squamous cell carcinoma (ESCC) is a malignant tumor with poor prognosis. Necroptosis is important for tumor immunity, but its role in ESCC remains unclear. This retrospective bioinformatics study aimed to investigate the prognostic value of necroptosis-related long non-coding RNAs (lncRNAs) and to identify key lncRNA-binding proteins (RBPs) in ESCC patients.MethodsRNA transcriptome and clinical data of ESCC patients were obtained from The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases. Necroptosis-related lncRNAs were identified through correlation analysis with necroptosis-related genes, subjected to consensus cluster analysis, and used to construct a prognostic risk model via least absolute shrinkage and selection operator (LASSO) regression. The hub RBP was experimentally validated by quantitative polymerase chain reaction (qPCR) using 30 pairs of ESCC and adjacent normal tissues from patients who underwent surgical resection.ResultsA total of 30 necroptosis-related lncRNAs were significantly correlated with overall survival (OS). The upregulated lncRNAs in the risk model were associated with high immune scores, innate immune cell infiltration, cluster 2 classification, and advanced T-stage disease (p < 0.05). Three hub RBPs (HNRNPA1, HNRNPC, and HNRNPK) were identified through protein-protein interaction network analysis. qPCR confirmed that HNRNPK was significantly overexpressed in ESCC tissues compared to adjacent normal tissues (p < 0.05).ConclusionsThe necroptosis-related lncRNA risk model is an independent prognostic factor for ESCC patients. HNRNPK was identified as a hub RBP significantly overexpressed in ESCC tissues. We hypothesize that HNRNPK may promote tumor progression through regulating proto-oncogene expression or modulating the immune microenvironment, though this requires further mechanistic validation.

Humans↗

PubMed2006

Translation initiation and the fate of bacterial mRNAs.

Studies in pro- and eukaryotes have revealed that translation can determine the stability of a given messenger RNA. In bacteria, intrinsic mRNA signals can confer efficient ribosome binding, whereas translational feedback inhibition or environmental cues can interfere with this process. Such regulatory mechanisms are often controlled by RNA-binding proteins, small noncoding RNAs and structural rearrangements within the 5' untranslated region. Here, we review molecular events occurring in the 5' untranslated region of primarily Escherichia coli mRNAs with regard to their effects on mRNA stability.

5' Untranslated Regions↗

PubMed2025

Genetic and chromatin regulation of Pvt1 monoallelic expression.

While most genes are equivalently expressed on both alleles, genes with random monoallelic expression (RME) stably maintain expression from only one allele, but the mechanisms and consequences of RME remain unclear. We performed allele-specific RNA sequencing (RNA-seq) on ∼100 F1 hybrid neural progenitor cell (NPC) clonal lines to reveal the extent of autosomal RME (aRME). Of the 287 aRME genes, Pvt1, an oncogenic long non-coding RNA, is an aRME with a genetic bias. In the absence of genetic differences, Pvt1 undergoes balanced aRME. Pvt1 monoallelic expression is maintained by allele-specific active and repressive histone modifications, opposed to DNA methylation. Additionally, we provide a two-step mechanism for the initiation of aRME and demonstrate that Pvt1 monoallelic expression results in a growth phenotype due to the interplay with Myc. These findings provide insight into how genetic differences can skew a stochastic process, resulting in monoallelic expression with a phenotypic consequence in early development.

Chromatin↗

PubMed2006

Polyadenylation of genomic RNA and initiation of antigenomic RNA in a positive-strand RNA virus are controlled by the same cis-element.

Genomes and antigenomes of many positive-strand RNA viruses contain 3'-poly(A) and 5'-poly(U) tracts, respectively, serving as mutual templates. Mechanism(s) controlling the length of these homopolymeric stretches are not well understood. Here, we show that in coxsackievirus B3 (CVB3) and three other enteroviruses the poly(A) tract is approximately 80-90 and the poly(U) tract is approximately 20 nt-long. Mutagenesis analysis indicate that the length of the CVB3 3'-poly(A) is determined by the oriR, a cis-element in the 3'-noncoding region of viral RNA. In contrast, while mutations of the oriR inhibit initiation of (-) RNA synthesis, they do not affect the 5'-poly(U) length. Poly(A)-lacking genomes are able to acquire genetically unstable AU-rich poly(A)-terminated 3'-tails, which may be generated by a mechanism distinct from the cognate viral RNA polyadenylation. The aberrant tails ensure only inefficient replication. The possibility of RNA replication independent of oriR and poly(A) demonstrate that highly debilitated viruses are able to survive by utilizing 'emergence', perhaps atavistic, mechanisms.

Animals↗

PubMed2025

Role of lncRNA PVT1 in the progression of urological cancers: Novel insights into signaling pathways and clinical opportunities.

Urologic malignancies, encompassing cancers of the kidney, bladder, and prostate, represent approximately 25 % of all cancer cases. Recent advances have enhanced our understanding of PVT1's crucial functions. Long noncoding RNAs influence both the onset and development of cancer, as well as epigenetic alterations. Recent findings have focused on PVT1's mechanism of action across several malignancies, particularly urologic cancers. Understanding the various functions of PVT1 linked to cancer is necessary for the development of cancer detection and treatment when PVT1 is dysregulated. Furthermore, recent advancements in genomic and epigenetic research have elucidated the complex regulatory networks that control PVT1 expression. Comprehending the intricate role of PVT1 Understanding the complex function of PVT1 in urologic cancers has substantial clinical implications. Here, we summarize some of the most recent findings about the carcinogenic effects of PVT1 signaling pathways and the possible treatment strategies for urological malignancies that target these pathways.

Humans↗

PubMed1984

Nature and origin of the RNA associated with simian virus 40 large tumor antigen.

Simian virus 40 (SV40) large tumor (T) antigen isolated from mammalian cells undergoing lytic or transforming infection is associated with small RNA fragments ("T-antigen RNA") that are protected from nuclease digestion. The rather high complexity of the ribonuclease T1 fingerprints of T-antigen RNA suggested that it is mainly derived from cellular heterogeneous nuclear RNAs. In the present study, 5'-32P-labeled T-antigen RNA was hybridized to monkey, mouse, and human Alu and SV40 DNA, and the nucleotide sequence of 37 T1 oligonucleotides was determined. The results suggest that the bulk of T-antigen RNA is derived from noncoding, double-stranded, ordered regions of cellular heterogeneous nuclear RNAs that exhibit sequence homologies with interspersed repetitive elements of the cellular genome. The possible biological implications of these results are discussed.

Animals↗

PubMed2026

Unraveling the c-Myc-CASC19/HDAC1-NPM1 epigenetic axis: A novel regulatory circuitry and therapeutic target in gastric carcinogenesis.

Mounting evidence implicates long non-coding RNA cancer susceptibility candidate 19 (CASC19) in the pathogenesis of diverse malignancies. However, its functional role and molecular mechanisms in gastric cancer (GC) remain elusive. Herein, we identified a novel 717-bp transcript isoform of CASC19 in GC cells. This study aimed to delineate the biological functions and underlying mechanisms of this novel CASC19 transcript in GC pathogenesis. CASC19 was significantly upregulated in GC tissues and cell lines, correlating with adverse clinicopathological features and poor prognosis in GC patients. Functional investigations demonstrated that CASC19 overexpression potentiated GC cell proliferation, metastasis, and epithelial-mesenchymal transition, whereas CASC19 knockdown attenuated these malignant phenotypes and suppressed tumorigenesis in xenograft models. Mechanistically, CASC19 functioned as a molecular scaffold by recruiting histone deacetylase 1 (HDAC1) to the nucleophosmin 1 (NPM1) promoter. This recruitment sustained H3K27 deacetylation, thereby transcriptionally repressing NPM1 promoter activity and accelerating gastric carcinogenesis. Crucially, Depletion of HDAC1 or NPM1 partial rescued CASC19-mediated oncogenic effects. Intriguingly, the transcription factor c-Myc was found to transcriptionally activate CASC19 through direct binding to its promoter region. Collectively, our findings indicate that the c-Myc-CASC19/HDAC1-NPM1 axis acts as a potential prognostic biomarker candidate for GC and may represent a therapeutic vulnerability worthy of future investigation.

Humans↗

PubMed2026

Characterization and analysis of the full-length transcriptome of Frankliniella occidentalis (Thysanoptera: Thripidae).

BACKGROUND: Frankliniella occidentalis, an insect belonging to the order Thysanoptera, causes severe damage to agricultural and horticultural crops, resulting in significant economic losses worldwide. The development of molecular and sequencing technologies has helped elucidate the molecular mechanisms regulating its growth and development as well as its damaging activity. However, much remains to be explored. To further investigate the molecular complexity of this species, we sequenced the full-length transcriptome of mixed samples obtained from specimens at all developmental stages. RESULTS: Of all transcripts, 89.04% matched with the reference genome; additionally, 29,750 alternative splicing events, 2,342 genes with poly(A) sites, and 153 candidate fusion transcript events were identified, and 4,235 long noncoding RNAs were discovered. CONCLUSIONS: This is the first full-length transcriptome of F. occidentalis reported to date. This study greatly contributes to the understanding of the molecular complexity and diversity of this insect, providing a basis to develop specific molecular targets as well as resources for gene function studies in other insects.

Animals↗

PubMed1989

Cloning and synthesis of infectious cardiovirus RNAs containing short, discrete poly(C) tracts.

Mengovirus RNA transcripts with 5' noncoding poly(C) tracts of C8, C12, and C13UC10 have been synthesized in vitro from cDNA clones and shown to be infectious to HeLa cells. A chimeric clone has also been constructed which links the 5' end from one mengovirus clone (299 nucleotides, containing C13UC10) to a 7,424-base fragment derived from the 3' end of encephalomyocarditis (EMC) virus. Progeny virus isolated after transfection with the clone-derived RNAs had the same poly(C) tracts, mengovirus-specific sequences, or EMC virus-specific sequences as the transcript from which it was derived. Although the cloned poly(C) tracts were considerably shorter than those found in viral RNA from mengovirus (C50UC10) or EMC virus (C115UCUC3UC10), the growth characteristics of the progeny viruses in HeLa cells were indistinguishable from those of the parental viruses, indicating the length of this tract does not play a significant restrictive role for cardiovirus infectivity in tissue culture.

Cloning, Molecular↗

PubMed2005

Identification of a gene on chromosome 12q22 uniquely overexpressed in chronic lymphocytic leukemia.

The pathogenesis of chronic lymphocytic leukemia (CLL) is unknown but may involve aberrant activation of signaling pathways. Somatic hypermutations in rearranged immunoglobulin heavy-chain (IgVH) genes allow a division of CLL patients into 2 categories: mutated IgVH genes are associated with an indolent disease, whereas unmutated IgVH genes define an aggressive form. Using differential display to compare gene expression in CLL cells with and without IgVH hypermutations, we identified a novel gene, CLL up-regulated gene 1 (CLLU1), that was highly up-regulated in CLL cells without IgVH hypermutations. CLLU1 mapped to chromosome 12q22, within a cluster of genes that are active in germinal center B cells. However, appreciable levels of CLLU1 were detectable only in CLL cells and not in a panel of normal tissue extracts or in any other tested hematologic malignancy. High expression of CLLU1 in CLL samples occurred irrespective of trisomy 12 or large chromosomal rearrangements. CLLU1 encodes 6 mRNAs with no sequence homology to any known gene, and most transcripts appear to be noncoding. Two transcripts, however, potentially encode a peptide with remarkable structural similarity to human interleukin 4. These data, in particular the unique and restricted expression pattern, suggest that CLLU1 is the first disease-specific gene identified in CLL.

Chromosome Mapping↗