Exposome-wide patterns predict brain health in aging.
The 9 matches
- [1] § Methods › Grey matter health prediction model ↔ 2_BAGCharacterization/2_1_BAG_Characterization.py, lines 184–209 · score 0.80 · T1 head image, volumetric scaling, standard space, height, sex, confounds
- [2] § Methods › Grey matter health prediction model ↔ 2_BAGCharacterization/2_2_BAG_Visualisation.py, lines 185–210 · score 0.80 · T1 head image, volumetric scaling, standard space, height, sex, confounds
- [3] § Methods › Grey matter health prediction model ↔ 1_BrainAgePrediction/1_1_BrainAgePrediction.py, lines 179–229 · score 0.76 · squared error, cross validation, absolute error, metrics, root, shuffling
- [4] § Methods › Participants ↔ 1_BrainAgePrediction/1_0_DataFiltering.py, lines 219–272 · score 0.74 · long standing illness, healthy participants, stroke, ICD, diagnosis, field
- [5] § Methods › Brain age prediction model ↔ 1_BrainAgePrediction/1_1_BrainAgePrediction.py, lines 141–177 · score 0.73 · Linear Regression, Random Forest, Brain Age Prediction, tuning, RF, hyperparameter
- [6] § Methods › Grey matter health prediction model ↔ 2_BAGCharacterization/2_1_BAG_Characterization.py, lines 243–292 · score 0.71 · squared error, cross validation, absolute error, root, shuffling, fold
- [7] § Methods › Brain age prediction model ↔ 1_BrainAgePrediction/1_2_visualisation.py, lines 305–339 · score 0.59 · brain age prediction, bias correction, chronological age, slope, intercept, correlation
- [8] § Methods › Exposome variables ↔ 2_BAGCharacterization/2_3_BAG_to_SHAP.ipynb, lines 110–139 · score 0.57 · body morphology, socio affective, mental health, bone, composition
- [9] § Results › Brain age gap indicator of grey matter health ↔ 1_BrainAgePrediction/1_2_visualisation.py, lines 305–339 · score 0.53 · Brain Age prediction, Absolute Error, chronological age, MAE, correlation, healthy
Paper
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The authors' code
Python · 386 lines · 13 KB · MIT · 2 matches
- #!/usr/bin/env python3
- # -*- coding: utf-8 -*-
- """
- @author:
- Mostafa Mahdipour [email hidden]
- """
- """
- # Brian Age Gap (BAG) prediction
- In this code, we try to change the features into continuous and categorical
- then using uptona for hyperparameter tuning.
- """
- # %% 1 importing libraries
- import sys
- import os
- import ast # convert string model_params to dictionary
- from click import command
- import numpy as np
- # import wget
- import pandas as pd # to use dataframe
- import glob
- import pickle
- # import psutil
- from pprint import pprint # To print in a pretty way
- # import missingno as msno
- import nest_asyncio
- nest_asyncio.apply()
- import matplotlib.pyplot as plt # to make plots
- import seaborn as sns # to make plots
- import scipy # to calculate correlation
- import optuna
- from optuna.distributions import IntDistribution
- from optuna.distributions import FloatDistribution
- from sklearn.metrics import mean_absolute_error # to calculate MAE
- from sklearn.metrics import mean_squared_error # to calculate MSE
- from sklearn import linear_model
- from sklearn.model_selection import KFold
- # from sklearn.model_selection import train_test_split, RepeatedStratifiedKFold
- from julearn import run_cross_validation
- from julearn.utils import configure_logging
- from julearn.pipeline import PipelineCreator
- from julearn.model_selection import RepeatedContinuousStratifiedKFold
- # from julearn.model_selection import ContinuousStratifiedKFold
- import tqdm
- tqdm.tqdm
- import shap
- # %% 2 Color print in terminal
- RED = "\033[1;31m"
- BLUE = "\033[1;34m"
- CYAN = "\033[1;36m"
- GREEN = "\033[0;32m"
- RESET = "\033[0;0m"
- BOLD = "\033[;1m"
- REVERSE = "\033[;7m"
- UNDERLINE = '\033[4m'
- CBLACKBG = '\33[40m'
- CREDBG = '\33[41m'
- CGREENBG = '\33[42m'
- CYELLOWBG = '\33[43m'
- CBLUEBG = '\33[44m'
- CVIOLETBG = '\33[45m'
- CBEIGEBG = '\33[46m'
- CWHITEBG = '\33[47m'
- # %% 3 Starting statement
- sys.stdout.write(RED)
- # sys.stdout.write(BOLD)
- print(
- "\n\n================================================="
- "\nprogram started\n"
- "=================================================\n\n"
- )
- sys.stdout.write(CYAN)
- print('Julearn info\n')
- sys.stdout.write(RESET)
- # To log information
- configure_logging(level='INFO')
- # Checking which conda env are we using
- sys.stdout.write(GREEN)
- # sys.stdout.write(BOLD)
- print(
- "\nvirtual conda env:\n"
- )
- print(sys.executable)
- sys.stdout.write(RESET)
- #%% 4 Pathes
- My_current_path=os.path.abspath(os.getcwd())
- path_2_data_NEW = My_current_path + 'Path/to/exposome/Subgroups' # path to the exposome subgroups
- # for exmple:
- # path_2_data_NEW = My_current_path + '/../../../../' + '1_DATA/4_BAG_Prediction/9_DATA_4_BAG_GMV_SHAP'
- result_folder_Name= 'name of the folder' # name of the folder to save the results
- # for exmple:
- # result_folder_Name= '3_BAG_CR_RF' # 3 ==> subset # 3 or main subset, BAG ==> brain age gap, CR ==> with Confound Removal, RF ==> Random Forest
- Path_to_Save_Results = My_current_path + '/path/to/results/'+ result_folder_Name
- if not os.path.exists(Path_to_Save_Results):
- # If it doesn't exist, create it
- os.makedirs(Path_to_Save_Results)
- sys.stdout.write(GREEN)
- print(f"Directory '{Path_to_Save_Results}' created successfully.")
- sys.stdout.write(RESET)
- else:
- sys.stdout.write(RED)
- print(f"Directory '{Path_to_Save_Results}' already exists.")
- sys.stdout.write(RESET)
- #%% 5 creating optuna study
- '''
- If we run the code for the first time, we will get an error because there is no study to delete
- We can ignore the error and create the study with the "try & except" approach.
- '''
- study_name = result_folder_Name
- storage_name = "sqlite:///"+result_folder_Name+".db"
- try:
- optuna.delete_study(study_name=study_name, storage=storage_name)
- print(f"Study '{study_name}' deleted successfully.")
- except KeyError:
- print(f"Warning: The study '{study_name}' does not exist. Continuing with the next steps...")
- # optuna.delete_study(study_name="12_6_226_BAG_all_CR_RF", storage="sqlite:///rf-test.db")
- study = optuna.create_study(
- direction = "maximize",
- storage = storage_name,
- study_name = result_folder_Name,
- load_if_exists=True,
- )
- sys.stdout.write(CGREENBG)
- sys.stdout.write(UNDERLINE)
- sys.stdout.write(BLUE)
- # sys.stdout.write(BOLD)
- print("\n\n=================================================")
- print(f"The study '{result_folder_Name}' has been created successfully.")
- print("=================================================\n\n")
- sys.stdout.write(RESET)
- #%% 6 loading Data
- # ls function : This is a function that can do ls in a directory
- def listdir_nohidden(path):
- return glob.glob(os.path.join(path, '*')) # to make a list of our folders' contents
- list_of_input_files=listdir_nohidden(path_2_data_NEW)
- print(np.sort(list_of_input_files))
- '''
- As mentioned in the README file, we have 3 different subgroups of exposome data:
- - subgroup1.csv
- - subgroup2.csv
- - subgroup3.csv
- And a list of categorical features:
- - listofcols2Cat.npy
- Therefore, we have first check the files in the directory and then load the them.
- '''
- # Here we load the subgroup3 and listofcols2Cat:
- # (we can change the index to load other datasets)
- # loading the data : np.sort(list_of_input_files)[2] ==> 'subgroup3.csv'
- All_Data=pd.read_csv(np.sort(list_of_input_files)[2],index_col=0).reset_index(drop=True)
- # loading the Categorical data labels : np.sort(list_of_input_files)[-1] ==> 'listofcols2Cat.npy'
- loaded_list = np.load(np.sort(list_of_input_files)[-1], allow_pickle=True)
- #%% 7 parentheses
- All_Data.columns = All_Data.columns.str.replace(')', '')
- All_Data.columns = All_Data.columns.str.replace('(', '')
- All_Data.columns = All_Data.columns.str.replace(',', '')
- All_Data.columns = All_Data.columns.str.replace('/', '')
- # Perform string replacements on each element in the list
- listofcols2Category = [col.replace(')', '').replace('(', '').replace(',', '').replace('/', '') for col in loaded_list]
- #%% 8 Features and data types
- """
- defining Features and data types
- # X_list
- - confounds
- - features
- -- categorical
- -- continuous
- """
- Data2Model= All_Data.drop(columns=['TIV','GM',
- 'BAG', 'Session',
- 'Predicted_Age', 'Corrected_Predicted_Age'])
- y = 'Corrected_BAG' # target
- X_list = list(set(Data2Model.columns) - set(['SubjectID',
- 'Corrected_BAG'])) # features & confounds
- Our_Confounds = ['Age','Age2', 'Height-2.0', 'Sex',
- 'Volumetric_scaling_from_T1_head_image_to_standard_space-2.0']
- Our_Features = list(set(X_list) - set(Our_Confounds))
- common_elements = np.intersect1d(Our_Features, listofcols2Category) # the categorical features in our dataset
- ContinuousVars = list(set(Our_Features) - set(common_elements))
- # define features and confounds
- # {'categorical' : listofcols2Category, 'continuous' : ContinuousVars})
- X_types = {'continuous': list(ContinuousVars), 'categorical' : list(common_elements), 'confounds': list(Our_Confounds)}
- #%% 9 Pipeline
- rand_seed = 94
- creator = PipelineCreator(problem_type="regression", apply_to=["continuous","categorical"])
- creator.add("zscore", apply_to="continuous")
- creator.add("confound_removal", confounds="confounds", apply_to="continuous")
- # here we add the model. Models We have used:
- # 'linreg' ==> 'linear_regression', there is no hyperparameter for it to be tuned
- # 'ridge' ==> 'ridge', we have tuned alpha as a hyperparameter (see below)
- # 'svr' ==> 'linear_svr', we have tuned C, kernel, and gamma as a hyperparameters (see Julearn documentation)
- # 'rf' ==> 'random_forest', we have tuned n_estimators, min_samples_split, min_samples_leaf,and max_depth hyperparameters (see Julearn documentation)
- # the example of RandomForest hyperparameters:
- creator.add("rf",
- n_estimators=(200,1000,"uniform"),
- min_samples_split=(1,10, "uniform"),
- min_samples_leaf=(1,40, "uniform"),
- max_depth = (20,180, "uniform")
- )
- sys.stdout.write(RED)
- sys.stdout.write(BOLD)
- sys.stdout.write(CGREENBG)
- print(creator)
- sys.stdout.write(RESET)
- #%% 10 Nested CV and scores
- cv_splitter = RepeatedContinuousStratifiedKFold(3,
- n_splits=5, n_repeats=5,
- random_state=rand_seed,
- method='quantile')
- scoring = ['neg_mean_absolute_error', 'neg_mean_squared_error',
- 'neg_root_mean_squared_error',
- 'r2','r2_corr',
- 'r_corr']
- search_params = {
- "kind": "optuna",
- "n_trials": 100,
- "study": study,
- "cv": KFold(n_splits=5, shuffle = True, random_state=rand_seed),
- "verbose" : 1
- }
- #%% 11 run_cross_validation :
- scores, model, inspector = run_cross_validation(
- X=X_list,
- y=y,
- data=Data2Model,
- X_types=X_types,
- model=creator,
- return_train_score=True,
- return_estimator="all",
- return_inspector=True,
- seed=rand_seed,
- cv=cv_splitter,
- scoring=scoring,
- search_params=search_params,
- n_jobs=4, # as Fede sugested n_jobs should be set to 4
- )
- sys.stdout.write(BLUE)
- print('best para', model.best_params_)
- sys.stdout.write(RESET)
- sys.stdout.write(RED)
- print(
- "\n\n================================================="
- "\nModel Trained\n"
- "=================================================\n\n"
- )
- sys.stdout.write(RESET)
- # %% 12 saving
- # Save the model using pickle
- with open(Path_to_Save_Results+'/Model.pkl', 'wb') as file:
- pickle.dump(model, file)
- # Save the inspector using pickle
- with open(Path_to_Save_Results+'/inspector.pkl', 'wb') as file:
- pickle.dump(inspector, file)
- # Save scores using pickle
- with open(Path_to_Save_Results+'/scores.pkl', 'wb') as file:
- pickle.dump(scores, file)
- # %% 13 extra plots plot
- if not os.path.exists(Path_to_Save_Results+'/Outerfold_extra'):
- # If it doesn't exist, create it
- os.makedirs(Path_to_Save_Results+'/Outerfold_extra')
- sys.stdout.write(GREEN)
- print(f"Directory '{Path_to_Save_Results+'/Outerfold_extra'}' created successfully.")
- sys.stdout.write(RESET)
- else:
- sys.stdout.write(RED)
- print(f"Directory '{Path_to_Save_Results+'/Outerfold_extra'}' already exists.")
- sys.stdout.write(RESET)
- for i, (train_index, test_index) in enumerate(cv_splitter.split(Data2Model.loc[:,X_list], Data2Model.loc[:,y])):
- # sys.stdout.write(RED)
- # print("\n\n=================================================\n\n")
- # print(f"Fold {i}:")
- # sys.stdout.write(RESET)
- y_pred = scores['estimator'][i].predict(Data2Model.iloc[test_index,:].loc[:,X_list]).ravel()
- y_true=Data2Model.iloc[test_index,:].loc[:,y]
- mae=mean_absolute_error(y_true, y_pred)
- mse=mean_squared_error(y_true, y_pred)
- corr, p = scipy.stats.pearsonr(y_pred, y_true)
- # sys.stdout.write(CYAN)
- # print('Test MSE: ', mse ,'Test MAE: ', mae, 'Test Corr: ', corr)
- # sys.stdout.write(RESET)
- results_df_test = pd.DataFrame({'True BAG': y_true, 'Predicted BAG': y_pred})
- # Generate scatter plot
- fig100=plt.figure('scatter predicted BAG vs True BAG',figsize=(16,16))
- ax11=sns.jointplot(data=results_df_test, x="True BAG", y="Predicted BAG",
- kind="kde",fill=True, joint_kws={'alpha': 0.5} ,
- color='Darkorange') # peru
- ax11.ax_joint.set_xlim(-20,20)
- ax11.ax_joint.set_ylim(-20,20)
- ax11.ax_joint.plot([-20,20], [-20,20], 'r-', linewidth = 2)
- ax11.ax_joint.tick_params(axis='both', labelsize=20)
- sns.regplot(data=results_df_test, x='True BAG', y='Predicted BAG',
- scatter=False, color='black', line_kws={'linestyle':'--'}, ax=ax11.ax_joint)
- #calculate slope and intercept of regression equation
- slope_1, intercept_1, r_1, p_1, sterr_1 = scipy.stats.linregress( x=ax11.ax_joint.get_lines()[1].get_xdata(),
- y=ax11.ax_joint.get_lines()[1].get_ydata())
- # Add regression equation to the joint plot
- ax11.ax_joint.text(8, -10, 'y = ' + str(round(intercept_1, 3)) + ' + ' + str(round(slope_1, 3)) + 'x')
- plt.grid()
- # plt.show()
- # Save
- results_df_test.to_csv(Path_to_Save_Results+'/Outerfold_extra' + '/outer_CV_fold'+str(i)+'.csv')
- # # del results_df_test
- plt.savefig(Path_to_Save_Results+'/Outerfold_extra' + '/FOLD'+str(i)+'.png')
- plt.close(fig100)
- plt.close('all')
- del results_df_test
- del intercept_1
- del slope_1
- del y_pred
- del y_true
- del fig100
- del ax11
- # save scores
- scores.to_csv(Path_to_Save_Results+'/Outerfold_extra'+'/scores.csv')
- # %% 14 ending statement
- sys.stdout.write(RED)
- print(
- "\n\n================================================="
- "\nProgramm ended\n"
- "=================================================\n\n"
- )
- sys.stdout.write(RESET)
- # %%
2_1_BAG_Characterization.py at commit 0da13fa, under MIT · at the source
Overview
- Institute of Neuroscience and Medicine (INM-7: Brain and Behaviour), Research Centre Jülich, Jülich, Germany
- Institute of Systems Neuroscience, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Department of Bioinformatics, Fraunhofer Institute for Algorithms and Scientific Computing (SCAI), Sankt Augustin, Germany
- Mathematical Institute, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Department of Nuclear Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- GIGA-CRC-Human Imaging, University of Liège, Liège, Belgium
Abstract
Promoting brain health is vital for well-being and reducing healthcare burdens. Brain health as measured with the Brain Age Gap (BAG) - the difference between chronological and predicted brain age- relates to many factors. However, a holistic view, integrating the range of factors an individual brain is exposed to, is missing for understanding how the exposome shapes brain health. After computing BAG as an indicator of grey matter (GM) health, we predicted it using machine learning based on 261 exposome variables (spanning biomedical, environmental, lifestyle, socio-affective, and early life domains) in UK Biobank participants. Exposome data can predict GM health with factors pertaining to cardiovascular and bone health, along with alcohol and smoking, nutrition and diabetes showing greater contribution to the prediction. In such domains, life period and duration of exposure appeared crucial. These findings call for early prevention in cardiovascular and metabolic health to promote life-long brain health.
Reproduced under the paper's license (CC BY), from the paper cited above.
Repositories
Its files are read in the Code ↔ Paper reader above, with 9 matches between paragraphs and lines of code.
MostafaMahdipour/Predicting_Brain_Age_Gap_BAG_using_UKB_exposome
0da13fa337a761161f9a78559c86c85cda4ec93f, 13 April 2026Availability: 1 check, the latest on 29 September 2026: the link answers
- 29 September 2026: the link answers
8 files
- 1_BrainAgePrediction/
1_0_DataFiltering.py , Python, 425 lines, 1 match - 1_BrainAgePrediction/
1_1_BrainAgePrediction.p , Python, 277 lines, 2 matchesy - 1_BrainAgePrediction/
1_2_visualisation.py , Python, 632 lines, 2 matches - 2_BAGCharacterization/
2_1_BAG_Characterization , Python, 386 lines, 2 matches.py - 2_BAGCharacterization/
2_2_BAG_Visualisation.py , Python, 401 lines, 1 match - 2_BAGCharacterization/
2_3_BAG_to_SHAP.ipynb , Jupyter, 380 lines, 1 match - LICENSE, License, 7 lines
- README.md, Text, 94 lines
Zenodo 18606659
Availability: 1 check, the latest on 29 September 2026: the link answers (HTTP 200)
- 29 September 2026: the link answers (HTTP 200)
8 files
- 1_BrainAgePrediction/
1_0_DataFiltering.py , Python, 425 lines - 1_BrainAgePrediction/
1_1_BrainAgePrediction.p , Python, 277 linesy - 1_BrainAgePrediction/
1_2_visualisation.py , Python, 632 lines - 2_BAGCharacterization/
2_1_BAG_Characterization , Python, 386 lines.py - 2_BAGCharacterization/
2_2_BAG_Visualisation.py , Python, 401 lines - 2_BAGCharacterization/
2_3_BAG_to_SHAP.ipynb , Jupyter, 380 lines - LICENSE, License, 7 lines
- README.md, Text, 82 lines
Code availability
The analysis code used in this study is publicly available on GitHub at (https://
Reproduced under the paper's license (CC BY), from the paper cited above.
Tracing map
Proposed by the machine: these links were found in the paper and verified at the source, without human review. The map will receive a Zenodo DOI once one of the paper's authors has validated it with their ORCID.
What the map holds:
- 2 repositories of the authors' code, each at its verified commit, with its license and how the link was found in the paper;
- 12 scripts, each with its path and the digest of its content;
- 9 matches between paragraphs of the paper and lines of the code (method lexical-v1);
- neither the text of the paper nor the code itself.
Its JSON (tracing-map.json) is deposited on Zenodo with its DOI once the map is validated.
Data
Datasets cited
- ukbiobank.ac.uk/
media/ , at UK Biobank; found in the text, “Participants”gnkeyh2q
Data availability
The brain imaging and exposome data used in this study are derived from the UK Biobank resource under application number 41655 (https://
Reproduced under the paper's license (CC BY), from the paper cited above.
Versions
The history of this record: each version stored by the harvester or made by a correction of its authors or of the maintainers of its code, and what changed in its facts. The texts of the paper (its abstract, its availability statements) are not part of it; versions that changed only those are not listed.
Version 1, 29 September 2026: the first record
Recorded: type, language, journal, volume, issue, pages, dates, 11 authors, 2 keywords, 12 MeSH terms, 1 funder, 63 references.
Cite
This paper
Mahdipour, M., Maleki Balajoo, S., Raimondo, F., Wu, J., Nicolaisen-Sobesky, E., More, S., Hoffstaedter, F., Schwender, H., Tahmasian, M., Eickhoff, S. B., & Genon, S. (2026). Exposome-wide patterns predict brain health in aging. Nature communications, 17(1), 3409. https://
BibTeX
@article{mahdipour2026ex
author = {Mahdipour, Mostafa and Maleki Balajoo, Somayeh and Raimondo, Federico and Wu, Jianxiao and Nicolaisen-Sobesky, Eliana and More, Shammi and Hoffstaedter, Felix and Schwender, Holger and Tahmasian, Masoud and Eickhoff, Simon B and Genon, Sarah},
title = {{Exposome-wide patterns predict brain health in aging}},
journal = {Nature communications},
year = {2026},
month = apr,
volume = {17},
number = {1},
pages = {3409},
publisher = {Nature Publishing Group},
issn = {2041-1723},
doi = {10.1038/
url = {https://
pmid = {41963296},
pmcid = {PMC13068930}
}
RIS
TY - JOUR
AU - Mahdipour, Mostafa
AU - Maleki Balajoo, Somayeh
AU - Raimondo, Federico
AU - Wu, Jianxiao
AU - Nicolaisen-Sobesky, Eliana
AU - More, Shammi
AU - Hoffstaedter, Felix
AU - Schwender, Holger
AU - Tahmasian, Masoud
AU - Eickhoff, Simon B
AU - Genon, Sarah
TI - Exposome-wide patterns predict brain health in aging
T2 - Nature communications
J2 - Nat Commun
PY - 2026
DA - 2026/
VL - 17
IS - 1
SP - 3409
SN - 2041-1723
PB - Nature Publishing Group
DO - 10.1038/
UR - https://
LA - en
ER -
CSL-JSON
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