CN117551760A - Biomarkers for predicting advanced tuberculosis and non-advanced tuberculosis and uses thereof - Google Patents
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Abstract
The application belongs to the technical field of biomedicine, and particularly relates to a biomarker for predicting advanced tuberculosis and non-advanced tuberculosis and application thereof. The biomarker provided herein includes: KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2. The biomarker can be used for specifically predicting progressive tuberculosis and non-progressive tuberculosis in a latent tuberculosis infection queue, so that progressive tuberculosis patients can be found more quickly and accurately in clinical diagnosis, and the biomarker is expected to be used for screening diagnosis of progressive tuberculosis, physical examination of healthy people, prediction and evaluation of tuberculosis treatment effect and the like, and provides powerful technical support for epidemic situation control of tuberculosis.
Description
Technical Field
The application belongs to the technical field of biomedicine, and particularly relates to a biomarker for predicting advanced tuberculosis and non-advanced tuberculosis and application thereof.
Background
Tuberculosis (Tuberculosis) is a chronic infectious disease caused by tubercle bacillus, which can invade various organs of human body and is commonly seen as pulmonary Tuberculosis. Latent tuberculosis infection (Latent Tuberculosis Infection, LTBI) refers to the presence of tubercle bacillus in an individual, but without the appearance of obvious symptoms, and without the development of active tuberculosis.
Advanced tuberculosis generally refers to a state in which pulmonary tuberculosis lesions continue to develop and spread in the body, and this form of tuberculosis is usually manifested by gradual increase of pulmonary lesions, and patients may develop symptoms such as cough, expectoration, fever, etc. Treatment of advanced tuberculosis often requires the use of antitubercular drugs to prevent further exacerbation of the condition. In contrast, non-progressive tuberculosis generally refers to a relatively stable state, without significant spread or progression, and the patient may not exhibit significant symptoms, or symptoms may be lighter. Antitubercular agents are still needed for the treatment of non-progressive tuberculosis, but the course of treatment may be generally shorter. Tuberculosis is so challenging to control and manage, in part because of its latency and potential activation mechanisms. Some patients may be in a latent state of tubercle bacillus for a long period of time, and at some point, tubercle bacillus is activated, resulting in an active tuberculosis outbreak. Thus, early identification of those people who may develop active tuberculosis becomes critical. In this context, it is of great strategic importance to establish a marker that can identify advanced tuberculosis.
Genes have attracted considerable attention in recent years as markers for tuberculosis diagnostic models. This emerging approach provides potential opportunities for early diagnosis of tuberculosis and epidemic monitoring. In the traditional tuberculosis diagnosis, methods such as bacterial culture, acid fast staining and the like are often used, and the methods require a long time and are complicated to operate, so that the early diagnosis capability is limited. And the gene-based diagnostic method has the characteristics of rapidness, sensitivity and specificity. By detecting the gene expression level in host cells related to tubercle bacillus infection, the immune response of a patient can be found in advance, and early diagnosis is expected to be realized, but no progressive tuberculosis related marker in a latent tuberculosis infection queue can be predicted at present.
Disclosure of Invention
The purpose of the application is to provide a biomarker for predicting progressive tuberculosis and non-progressive tuberculosis and application thereof, and aims to solve the technical problem of how to rapidly and accurately predict progressive tuberculosis and non-progressive tuberculosis in a latent tuberculosis infection queue.
In order to achieve the purposes of the application, the technical scheme adopted by the application is as follows:
the first aspect of the present application provides a biomarker for predicting advanced tuberculosis, the biomarker comprising the following genes: KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2.
In a second aspect, the application provides an application of a reagent for detecting the biomarker in preparation of products for predicting progressive tuberculosis groups and non-progressive tuberculosis groups in a latent tuberculosis infection queue.
The embodiment of the application obtains a group of biomarkers comprising 15 genes based on prospective queue research, machine learning elastic network algorithm and random forest tree modeling, and the marker combination can specifically predict progressive tuberculosis and non-progressive tuberculosis in a latent tuberculosis infection queue. Therefore, the biomarker provided by the embodiment of the application is beneficial to finding progressive tuberculosis patients more quickly and accurately in clinical diagnosis, is hopeful to be used for screening diagnosis of progressive tuberculosis, physical examination of healthy people, prediction and evaluation of tuberculosis treatment efficacy and the like, and provides powerful technical support for epidemic situation control of tuberculosis.
The embodiment of the application can specifically predict the progressive tuberculosis and the non-progressive tuberculosis in the latent tuberculosis infection queue based on the biomarker comprising 15 genes, so that the product for predicting the progressive tuberculosis group and the non-progressive tuberculosis group in the latent tuberculosis infection queue can be prepared by using the reagent for detecting the biomarker.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of predictive results of analysis of progressive and non-progressive tuberculosis populations in a latent tuberculosis infection cohort using a GSE79362 prospective study cohort data set;
FIG. 2 is a diagram of screening characteristic genes by a machine learning elastic network algorithm, wherein A is the difference analysis of sequencing results of a progressive tuberculosis crowd and a non-progressive tuberculosis crowd to obtain 108 difference genes, and B is the screening of 15 characteristic genes by the machine learning elastic network algorithm based on the 108 difference genes;
FIG. 3 is a random forest model of 15 gene combinations for predicting progressive tuberculosis and non-progressive tuberculosis, where A and B are predictive power of 15 gene combination markers in the training dataset and C and D are predictive power of 15 gene combination markers in the test dataset;
FIG. 4 is a validation graph of 15 gene combination markers predictive of advanced tuberculosis in GSE79362 dataset, selecting all prospective queues prior to tuberculosis diagnosis, and dividing the prospective queues into a set of data at 180 days each interval;
FIG. 5 is a validation graph of 15 gene combination markers predictive of advanced tuberculosis in GSE79362 dataset, selecting all prospective queues prior to tuberculosis diagnosis, and dividing the prospective queues into a set of data at 360 days each interval;
FIG. 6 is a validation graph of 15 gene combination markers predicting progressive tuberculosis in GSE112104 and GSE94438 independent dataset; wherein, A is the accuracy of 15 gene combination markers in GSE112104 data set for predicting progressive tuberculosis, and B-D is the accuracy of 15 gene combination markers in GSE94438 data set for predicting progressive tuberculosis.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In the present application, "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s).
It should be understood that, in various embodiments of the present application, the sequence number of each process does not mean that the sequence of execution is sequential, and some or all of the steps may be executed in parallel or sequentially, where the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The markers capable of efficiently identifying progressive tuberculosis have important strategic significance, and can help clinicians to identify tuberculosis patients more accurately so as to intervene and treat early, thereby reducing the severity of diseases and improving the success rate of treatment. The method is beneficial to the health of patients, helps to reduce the transmission of tuberculosis in communities, and finally helps to realize the prevention and control of tuberculosis worldwide. Therefore, establishing markers capable of identifying advanced tuberculosis is one of the important problems to be solved in the current public health field.
Gene-based diagnostic methods are characterized by being faster, more sensitive and more specific. By detecting the gene expression level associated with tuberculosis infection in the host cell, the immune response of the patient can be found in advance, and an earlier diagnosis is expected to be realized. By analyzing large-scale gene data analysis, the transmission condition of tubercle bacillus infection in different areas and people can be tracked, and timely preventive control measures can be taken. However, while this approach is fully potential, it also faces challenges such as standardization, data analysis, and cost issues. Therefore, further research and development are required for gene as a tuberculosis diagnosis model marker to ensure its effectiveness and feasibility in clinical practice.
Machine learning algorithms play an increasingly important role in tuberculosis diagnosis. These algorithms can analyze large-scale medical data, including clinical information, imaging data, and molecular biomarkers, to help doctors diagnose tuberculosis more accurately. The machine learning model can identify specific tuberculosis modes and trends, assist medical decision making and improve early diagnosis accuracy. In addition, they can also be personalized based on data from different patients, selecting the optimal treatment regimen. Among them, random forests occupy an important place in machine learning algorithms. It is an integrated model consisting of a number of decision trees, each of which is a very complex nonlinear model. After constructing a plurality of decision trees, predictions of random forests are obtained by training and voting on these trees. The random forest model introduces randomness in the construction and prediction of each decision tree, which helps to increase the diversity of the model and reduce the risk of overfitting. For regression problems, the embodiment of the application adopts an average or weighted average mode to combine the predicted value of each tree into a final regression result. Thus, there is no single mathematical formula to represent the entire random forest model.
It is noted that the specific course of tuberculosis may vary from individual to individual, and that the definition of progressive tuberculosis and non-progressive tuberculosis may vary from medical literature to medical literature. In the examples of the present application, however, advanced tuberculosis (TB progress) refers to patients who are transformed into active tuberculosis by latent tuberculosis during the follow-up period, and non-advanced tuberculosis (TB non-progress) refers to patients who are not transformed into active tuberculosis by latent tuberculosis patients during the whole follow-up period, through prospective cohort studies. Based on the fact that no progressive tuberculosis related markers in the latent tuberculosis infection queue can be predicted at present, the application provides the following scheme.
In a first aspect, embodiments of the present application provide a biomarker for predicting advanced tuberculosis, the biomarker comprising the following genes: KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2. The 15 genes are all provided by the NCBI (National Center for Biotechnology Information (nih. Gov)) platform as follows:
KREMEN1: kringle containing transmembrane protein 1
DYSF: dysferlin
ALPK1: alpha kinase 1
ZNF438: zinc finger protein 438
ANKRD22: ankyrin repeat domain 22
C1QB: complement C1q B chain
WDFY3: WD repeat and FYVE domain containing 3
HIST1H3D: H3 clustered histone 4
BST1: bone marrow stromal cell antigen 1
SORT1: sortilin 1
GBP6: guanylate binding protein family member 6
OAS1: 2'-5'-oligoadenylate synthetase 1
TRIM25: tripartite motif containing 25
FBXO6: F-box protein 6
BATF2: basic leucine zipper ATF-like transcription factor 2。
the biomarkers provided in the embodiments of the present application are a set of gene combinations including the above-described KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and BATF2 genes. The 15 gene combinations are obtained based on prospective queue research, machine learning elastic network algorithm and random forest tree modeling. The 15 gene combinations can specifically predict progressive tuberculosis and non-progressive tuberculosis in the latent tuberculosis infection queue. In the aspect of clinical diagnosis, 15 gene combinations are favorable for finding progressive tuberculosis patients faster and more accurately, are expected to be used for screening diagnosis of progressive tuberculosis, physical examination of healthy people, prediction and evaluation of tuberculosis treatment effect and the like, and provide powerful technical support for epidemic situation control of tuberculosis.
In a second aspect, embodiments of the present application provide the use of an agent for detecting the biomarkers described above for the preparation of a product for predicting a population of progressive tuberculosis and a population of non-progressive tuberculosis in a latent tuberculosis infection queue.
Specifically, the reagent includes a substance that detects any one of the following detection objects (1) to (3):
(1) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2 genes;
(2) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and the mRNA encoded by the bat 2 gene;
(3) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 genes.
In some embodiments, the product for predicting the population of progressive tuberculosis and the population of non-progressive tuberculosis in the latent tuberculosis infection queue comprises a kit for predicting the population of progressive tuberculosis and the population of non-progressive tuberculosis in the latent tuberculosis infection queue. Accordingly, the kit comprises fluorescent quantitative PCR detection reagents.
In some embodiments, the product for predicting the population of progressive tuberculosis and the population of non-progressive tuberculosis in the latent tuberculosis infection queue comprises a system for predicting the population of progressive tuberculosis and the population of non-progressive tuberculosis in the latent tuberculosis infection queue. In particular, reagents and/or instrumentation required to detect the above-described biomarkers may be included, or any reagent and/or instrumentation capable of effecting quantitative detection of the above-described biomarkers may be used.
In some embodiments, a system includes:
a data acquisition unit: the method comprises the steps of carrying out gene detection on a sample of a latent tuberculosis infection queue to obtain expression level data of biomarkers in the sample;
a data analysis unit: obtaining disease risk scores of the samples by combining expression level data of the biomarkers by using a random forest integration model;
data prediction unit: and predicting whether the sample is a progressive tuberculosis group or a non-progressive tuberculosis group according to the disease risk score.
Specifically, in the data analysis unit, the random forest integration model is as follows:
input data set:D= {(x 1 , y 1 ), (x 2 , y 2 ), … , (x n , y n ) Wherein x is i Is a feature vector, y i Is the corresponding ending tag;
training data set for each decision tree:D sub whereinD sub Is composed ofDRandomly extracting to form;
prediction result of each decision tree:C(x) Representing a given input x-eigenvector atD sub Predictive results in training data;
disease risk score for random forests:wherein T is the number of decision trees;
the x feature vectors include KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and BATF2 genes; the outcome labels corresponding to y are progressive tuberculosis and non-progressive tuberculosis; the number of decision trees t=500;
in the data prediction unit: if the disease risk score is more than or equal to 0.5, the sample is a progressive tuberculosis crowd; if the disease risk score is less than 0.5, the sample is a non-progressive tuberculosis group.
Specifically, in the data acquisition unit, the gene detection includes detection using an Illumina HiSeq 2000 sequencing platform. Further, the expression level data is subjected to sample correction by variance stabilization transformation.
In the above application, the product comprises reagents and/or instruments required for detecting the detection object as described in any one of (1) to (3) below:
(1) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2 genes;
(2) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and the mRNA encoded by the bat 2 gene;
(3) KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 genes.
In particular, a system for identifying populations of progressive and non-progressive tuberculosis in a latent tuberculosis infection queue includes the above-described reagents and/or instruments.
Among the above systems are reagents and/or instrumentation required for quantitative PCR detection of KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 gene expression levels, or for detection of KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 gene expression levels using a gene chip.
The gene expression level is obtained by measuring a test sample by an Illumina HiSeq 2000 sequencing platform and correcting the sample by variance stabilizing transformation.
Further, the above products further include products for detecting or diagnosing tuberculosis, products for detecting occurrence and/or development of tuberculosis.
From data analysis, the expression differences of KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 genes are obvious in the advanced tuberculosis group (TB progress) and the non-advanced tuberculosis group (TB non-progress). The analysis is performed by using a GSE79362 prospective research queue, namely, the GSE79362 dataset is divided into a training dataset and a test dataset to construct a verification prediction model, and then the verified prediction model is reused for the GSE79362 dataset to analyze, and the result is that 15 gene combination markers are used for predicting the accuracy of progressive tuberculosis and non-progressive tuberculosis in a latent tuberculosis infection queue (LTBI (s)) as shown in figure 1, the Sensitivity (Sensitivity) is 89.1%, the Specificity (Specificity) is 92.2%, the positive prediction rate (positive predictive value, PPV) is 91.7%, and the negative prediction rate (negative predictive value, NPV) is 91.5%. Therefore, the 15 gene combinations can be used as markers for predicting the population with progressive tuberculosis and non-progressive tuberculosis in the latent tuberculosis infection queue, so as to monitor the occurrence and progress of tuberculosis.
The following description is made with reference to specific embodiments. Unless otherwise specified, the data analysis methods used in the following examples refer to conventional data analysis means.
Example 1
1. Screening of characteristic genes
1.1 data download
The embodiment of the application utilizes the GSE79362 data set for differential gene analysis, characteristic gene screening, model establishment and model verification. The present embodiments also utilize GSE94438 and GSE112104 independent datasets for model validation. The 3 data sets were obtained from the GEO (Home-GEO DataSets-NCBI (nih. Gov)) database.
1.2 differential Gene analysis
The embodiment of the application utilizes R software and limma function package to carry out statistical difference analysis on the progressive tuberculosis sample and the non-progressive tuberculosis sample in the GSE79362 data set. Wherein the threshold value log2 FC| is met>0.5,adjustedp-value<The gene of 0.05 was selected as the differential gene. For both progressive and non-progressive tuberculosis samples, the examples of the present application obtained a total of 108 differential genes.
1.3 screening of characteristic genes
For the 108 differential genes, 15 characteristic genes including KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6 and BATF2 characteristic genes are obtained by screening with an elastic network machine learning algorithm. These 15 characteristic genes have significant expression differences in the population with advanced tuberculosis and the population without advanced tuberculosis. As shown in fig. 2, a is a difference analysis of sequencing results of a population with advanced tuberculosis (TB progress) and a population with non-advanced tuberculosis (TB non-progress) in the examples of the present application, 108 differential genes were obtained, 68 up-regulated genes and 40 down-regulated genes; and B is that 15 characteristic genes are obtained by screening the differential genes through a machine learning elastic network algorithm, and the characteristic genes have obvious expression differences in a progressed tuberculosis group (TB progress) and a non-progressed tuberculosis group (TB non-progress).
2. Model building
2.1 modeling
The embodiment of the application utilizes a random forest model to construct a combined marker containing the 15 characteristic genes, and calculates disease risk scores of the 15 genes of the testee according to the following formula:
input data set:D= {(x 1 , y 1 ), (x 2 , y 2 ), … , (x n , y n ) Wherein x is i Is a feature vector, y i Is the corresponding ending tag;
training data set for each decision tree:D sub whereinD sub Is composed ofDRandomly extracting to form;
prediction result of each decision tree:C(x) Representing a given input x-eigenvector atD sub Predictive results in training data;
disease risk score for random forests:where T is the number of decision trees.
In the data analysis process of the embodiment of the application, the x feature vector includes KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and BATF2 genes; y corresponds to the outcome labels as progressive tuberculosis and non-progressive tuberculosis; the number of decision trees t=500.
2.2 principal component analysis
The principal component analysis preliminarily proves that the 15 gene combination markers of the embodiment of the application can obviously identify the progressive tuberculosis group and the non-progressive tuberculosis group in the latent tuberculosis infection queue.
2.3 subject working characteristics (receiver operating characteristic curve, ROC curves)
ROC curves further confirm the reliability of the markers: as shown in fig. 3, in the Training dataset (Training organs), the accuracy of marker-predicted advanced tuberculosis was 95.2%, sensitivity (Sensitivity) was 88.5%, specificity was 93.8%, positive predictive rate (PPV) was 91.2%, and negative predictive rate (NPV) was 91.4%; in the Test dataset (Test probes), the accuracy was 97.2%, the Sensitivity (Sensitivity) was 87.5%, the Specificity (Specificity) was 97.1%, the positive predictive rate (PPV) was 92.9%, and the negative predictive rate (NPV) was 91.7%. The training dataset accounted for 70% of the integrated dataset and the test dataset accounted for 30%.
3. Model verification
3.1 Verification of model accuracy using GSE79362 dataset 180 days apart before tuberculosis diagnosis
The present examples utilized a latent tuberculosis infection cohort 180 days apart prior to tuberculosis diagnosis to verify 15 gene combination markers. As shown in fig. 4, the disease risk score calculated by combining 15 gene expression levels with a random forest model is used for predicting the advanced tuberculosis group and the non-advanced tuberculosis group, and the obtained ROC curve confirms the reliability of the marker in predicting the advanced tuberculosis group in the latent tuberculosis infection queue, and the specific values are as follows: 1-180 days before tuberculosis diagnosis, the model accuracy is 93.8%, the sensitivity is 84.0%, the specificity is 94.3%, the positive prediction rate is 94.1%, and the negative prediction rate is 79.1%; 181-360 days before diagnosis, the model accuracy is 99.2%, the sensitivity is 100.0%, the specificity is 94.1%, the positive prediction rate is 83.3%, and the negative prediction rate is 97.0%; 361-540 days before diagnosis, the model accuracy is 98.1%, the sensitivity is 94.4%, the specificity is 94.8%, the positive prediction rate is 96.9%, and the negative prediction rate is 93.8%; 541-720 days before diagnosis, the model accuracy is 90.9%, the sensitivity is 83.3%, the specificity is 92.4%, the positive prediction rate is 76.5%, and the negative prediction rate is 92.5%;
3.2 verification of model accuracy using GSE79362 dataset at 360 day intervals prior to tuberculosis diagnosis
The present examples utilized a latent tuberculosis infection queue of 360 days apart prior to tuberculosis diagnosis to verify 15 gene combination markers. As shown in fig. 5, the disease risk score calculated by combining 15 gene expression levels with a random forest model predicts the advanced tuberculosis population and the non-advanced tuberculosis population, and the obtained ROC curve confirms the reliability of the marker in predicting the advanced tuberculosis population in the latent tuberculosis infection queue, and the specific values are as follows: 1-360 days before diagnosis, the model accuracy is 94.7%, the sensitivity is 80.6%, the specificity is 92.8%, the positive prediction rate is 89.7%, and the negative prediction rate is 86.8%; the model accuracy is 95.2%, sensitivity is 85.2%, specificity is 95.8%, positive predictive rate is 89.8% and negative predictive rate is 93.2% after 361-720 days before diagnosis.
3.3 verification of accuracy of model Using GSE94438 independent dataset
The examples herein utilize GSE94438 independent data sets to validate 15 gene combination markers. As shown in a in fig. 6, the disease risk score calculated by combining 15 gene expression levels with a random forest model predicts the progressive tuberculosis population and the non-progressive tuberculosis population, and the obtained ROC curve confirms the reliability of the marker in predicting the progressive tuberculosis population in the latent tuberculosis infection queue, and the specific values are as follows: the model accuracy is 93.5%, the sensitivity is 93.8%, the specificity is 81.0%, the positive prediction rate is 78.9%, and the negative prediction rate is 94.4%;
3.4 verification of model accuracy Using GSE112104 independent datasets
The examples herein utilize GSE112104 independent data sets to validate 15 gene combination markers. As shown in B-D in fig. 6, the disease risk score calculated by combining 15 gene expression levels with a random forest model predicts the progressive tuberculosis population and the non-progressive tuberculosis population, and the obtained ROC curve confirms the reliability of the marker in predicting the progressive tuberculosis population in the latent tuberculosis infection queue, and the specific values are as follows: 1-360 days before diagnosis, the model accuracy is 84.6%, the sensitivity is 59.0%, the specificity is 93.8%, the positive prediction rate is 76.3%, and the negative prediction rate is 79.6%; 361-720 days before diagnosis, the model accuracy is 75.7%, the sensitivity is 48.6%, the specificity is 88.3%, the positive prediction rate is 100.0%, and the negative prediction rate is 88.7%.
The verification example proves that the 15 gene combination markers have firm reliability in identifying progressive tuberculosis groups and non-progressive tuberculosis groups in the latent tuberculosis infection queue.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. A biomarker for predicting advanced tuberculosis and non-advanced tuberculosis, the biomarker comprising the following genes: KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and bat 2.
2. Use of an agent that detects a biomarker of claim 1 in the preparation of a product for predicting a population of progressive tuberculosis and a population of non-progressive tuberculosis in a latent tuberculosis infection queue.
3. The use of claim 2, wherein the reagent comprises a reagent that detects the gene of the biomarker and at least one of its mRNA and expressed protein.
4. The use of claim 2, wherein the product comprises a kit for predicting a population of progressive tuberculosis and a population of non-progressive tuberculosis in a cohort of latent tuberculosis infections.
5. The use according to claim 4, wherein the kit comprises fluorescent quantitative PCR detection reagents.
6. The use of claim 2, wherein the product comprises a system for predicting a population of progressive tuberculosis and a population of non-progressive tuberculosis in a cohort of latent tuberculosis infections.
7. The use according to claim 6, wherein the system comprises:
a data acquisition unit: the method comprises the steps of carrying out gene detection on a sample of a latent tuberculosis infection queue, and obtaining expression level data of the biomarker in the sample;
a data analysis unit: obtaining a disease risk score for the sample using a random forest integration model in combination with the expression level data;
data prediction unit: and predicting whether the sample is a progressive tuberculosis group or a non-progressive tuberculosis group according to the disease risk score.
8. The use according to claim 7, wherein in the data analysis unit, the disease risk score of the random forest integrated model is as follows:
input data set:D = {(x 1 , y 1 ), (x 2 , y 2 ), … , (x n , y n ) Wherein x is i Is a feature vector, y i Is the corresponding ending tag;
training data set for each decision tree:D sub whereinD sub Is composed ofDRandomly extracting to form;
prediction result of each decision tree:C(x) Representing a given input x-eigenvector atD sub Predictive results in training data;
disease risk score for random forests:wherein T is the number of decision trees;
the x feature vectors include KREMEN1, DYSF, ALPK1, ZNF438, ANKRD22, C1QB, WDFY3, HIST1H3D, BST1, SORT1, GBP6, OAS1, TRIM25, FBXO6, and BATF2 genes; the outcome labels corresponding to y are progressive tuberculosis and non-progressive tuberculosis; the number of decision trees t=500;
the data prediction unit is: if the disease risk score is more than or equal to 0.5, the sample is a progressive tuberculosis group; if the disease risk score is less than 0.5, the sample is a non-progressive tuberculosis population.
9. The use of claim 7, wherein the gene detection in the data acquisition unit comprises detection using an Illumina HiSeq 2000 sequencing platform.
10. The use according to claim 7, wherein in the data acquisition unit, the expression level data is subjected to sample correction by variance stabilizing transformation.
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