README.md

INLAomics

Spatial generalized linear mixed models (GMMM) methods for multiomic analysis using Integrated Nested Laplace Approximations (INLA).

Models

All models are implemented using the R-package INLA using the inla.rgeneric.define() method. The relevant scripts are under ./INLA/

Single assay

Gaussian Markov Random Fields (GMRF) as defined in [1] are considered

$$ \psi \sim \mathcal{N}_{n}\Big(\mathbf{0}, \tau^{-1}\big(\pi\mathbf{I} + (1-\pi)(\mathbf{D}-\mathbf{W})\big)^{-1}\Big) $$

where $\pi \in [0,1)$ weights between independent and spatially structured noise.

Multiple assays

For the non-conditional multivariate CAR (MCAR) we can utilize parts of INLAMSM in implementation with a modified precision matrix following [1]. Thus for the joint modeling of RNAs we refer to Sections 2.3 and 2.4 of [2]. The relevant scripts ./INLA/MCAR.R and ./INLA/indepMCAR.R.

The conditional GMRF, i.e., protein | RNA, is based on the approach of [3]. For the case with a single RNA in the conditioning set the relevant scripts are implemented in ./INLA/CCAR.R and ./INLA/spotCCAR.R where the latter restricts the cross assay effect to be from spot to spot. Note that ./STAN/CCAR.stan is the corresponding implementatin of ./INLA/CCAR.R in stan using a Poisson likelihood. For the case with $G$ genes in the conditing set, the suggested extension of [3] is

$$ p(\psi^{(1)}, \psi^{(2)}_1, \ldots, \psi^{(2)}_G)= p(\psi^{(1)} | \psi^{(2)}_1, \ldots, \psi^{(2)}_G) p(\psi^{(2)}_1, \ldots, \psi^{(2)}_G), $$

where the protein GMRF is

$$ p(\psi^{(1)} | \psi^{(2)}_1, \ldots, \psi^{(2)}_G) = \mathcal{N}_n \bigg( \sum _{i=1}^G \big(\eta _{0,i}\mathbf{I} + \eta _{1,i}\mathbf{W}\big)\psi_i^{(2)}, \tau_1^{-1}\big(\pi_1\mathbf{I} + (1-\pi_1)(\mathbf{D}-\mathbf{W})\big)^{-1} \bigg). $$

The relevant scripts are implemented in ./INLA/MCCAR.R and ./INLA/spotMCCAR.R($\eta_{1,i} = 0\ \forall i$).

Analysing the SPOTS data

Spleen

The data generated in [4] is considered, where we have added cell annotations to two replicates of spleen tissue sections. The files needed to recreate the analysis are

.
├── GSE198353_spleen_rep_1.csv
├── GSE198353_spleen_rep_1_filtered_feature_bc_matrix.h5
├── GSE198353_spleen_rep_2.csv
├── GSE198353_spleen_rep_2_filtered_feature_bc_matrix.h5
├── GSE198353_spleen_replicate_1_spatial.tar.gz
├── GSE198353_spleen_replicate_2_spatial.tar.gz
├── spatial
│   ├── qc_aligned_fiducials_image.jpg
│   ├── qc_detected_tissue_image.jpg
│   ├── scalefactors_json.json
│   ├── tissue_hires_image.png
│   ├── tissue_lowres_image.png
│   └── tissue_positions_list.csv
├── spatial2
│   ├── qc_aligned_fiducials_image.jpg
│   ├── qc_detected_tissue_image.jpg
│   ├── scalefactors_json.json
│   ├── tissue_hires_image.png
│   ├── tissue_lowres_image.png
│   └── tissue_positions_list.csv

...1_spatial.tar.gz and ...2_spatial.tar.gz are our own annotations, the remaining files can be found using GSE198353.

The Figure below outlines estimation of $\eta_0$ (left) and $\eta_1$ (right) when restricting the candidate models to a set of proteins and their paired genes. Subsequentily, from the model with the relevant pair we add on genes in the conditing set based on a variable selection procedure. The set of RNAs that are conditioned on is then expanded until there is a drop in the Deviance Information Criterion (DIC). Solid dots represent significant effects, in the sense that their $95$% credible sets does not cover $0$. Code to recreate CD3 rows are found in ./scripts/SPOTS/ProtVsGenes.R

Breast cancer

The necessary files are

.
├── GSE198353_mmtv_pymt.csv
├── GSE198353_mmtv_pymt_ADT.csv.gz
├── GSE198353_mmtv_pymt_GEX_filtered_feature_bc_matrix.h5
├── GSE198353_mmtv_pymt_spatial.tar.gz
└── spatial
    ├── aligned_fiducials.jpg
    ├── detected_tissue_image.jpg
    ├── scalefactors_json.json
    ├── tissue_hires_image.png
    ├── tissue_lowres_image.png
    └── tissue_positions_list.csv

Example code can be found in ./scripts/SPOTS/BreastPrediction.R

Other datasets

Visium10x, tonsil

Visium10x datasets

.
├── raw_feature_bc_matrix
│   ├── barcodes.tsv.gz
│   ├── features.tsv.gz
│   └── matrix.mtx.gz
└── spatial
    ├── aligned_fiducials.jpg
    ├── aligned_tissue_image.jpg
    ├── cytassist_image.tiff
    ├── detected_tissue_image.jpg
    ├── scalefactors_json.json
    ├── spatial_enrichment.csv
    ├── tissue_hires_image.png
    ├── tissue_lowres_image.png
    └── tissue_positions.csv

Example code can be found in ./scripts/visium/tonsil.R

Highplex data

GSE213264

.
├── GSM6578059_mousecolon_RNA.tsv.gz
├── GSM6578061_mousekidney_RNA.tsv.gz
├── GSM6578062_humantonsil_RNA.tsv.gz
├── GSM6578064_humanthymus_RNA.tsv.gz
├── GSM6578065_humanskin_RNA.tsv.gz
├── GSM6578068_mousecolon_protein.tsv.gz
├── GSM6578070_mousekidney_protein.tsv.gz
├── GSM6578071_humantonsil_protein.tsv.gz
├── GSM6578073_humanthymus_protein.tsv.gz
└── GSM6578074_humanskin_protein.tsv.gz

Example code can be found in ./scripts/Highplex/highplex.R

References

[1] Leroux, B. G., Lei, X., and Breslow, N. "Estimation of disease rates in small areas: a new mixed model for spatial dependence". In Statistical models in epidemiology, the environment, and clinical trials, pages 179–191. Springer, 2000.

[2] Francisco, F., Gómez-Rubio, V., and Martinez-Beneito, M. A. "Bayesian multivariate spatial models for lattice data with INLA." arXiv preprint arXiv:1909.10804 (2019).

[3] Xiaoping, J., Carlin, B. P., and Banerjee, S. "Generalized hierarchical multivariate CAR models for areal data." Biometrics 61.4 (2005): 950-961.

[4] Ben-Chetrit, N., Niu, X., Swett, A. D., Sotelo, J., Jiao, M. S., Stewart, C. M., ... & Landau, D. A. (2023). Integration of whole transcriptome spatial profiling with protein markers. Nature biotechnology, 41(6), 788-793.