Many monogenic disorders cause a characteristic facial morphology. Artificial intelligence can support physicians in recognizing these patterns by associating facial phenotypes with the underlying syndrome through training on thousands of patient photographs. However, this ‘supervised’ approach means that diagnoses are only possible if the disorder was part of the training set. To improve recognition of ultra-rare disorders, we developed GestaltMatcher, an encoder for portraits that is based on a deep convolutional neural network. Photographs of 17,560 patients with 1,115 rare disorders were used to define a Clinical Face Phenotype Space, in which distances between cases define syndromic similarity. Here we show that patients can be matched to others with the same molecular diagnosis even when the disorder was not included in the training set. Together with mutation data, GestaltMatcher could not only accelerate the clinical diagnosis of patients with ultra-rare disorders and facial dysmorphism but also enable the delineation of new phenotypes.
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The data that support the findings of this study are divided into two groups, nonsharable data (F2G) and sharable data (OMIM, CASIA-WebFace, GMDB). F2G data are from Face2Gene users and cannot be shared to protect patient privacy. OMIM data can be downloaded at https://omim.org/downloads. CASIA-WebFace and GMDB are available for noncommercial, research and educational purposes, and subject to controlled access. For CASIA-WebFace, user conditions are available at http://www.cbsr.ia.ac.cn/english/casia-webFace/casia-webfAce_AgreEmeNtS.pdf, and requests should be sent to email@example.com. For GMDB, please contact firstname.lastname@example.org and specify which analyses you intend to perform. The board of GestaltMatcher will check and respond within 10 business days whether your request is compatible with the user conditions.
GestaltMatcher can be subdivided into its algorithmic part, data that are required to train the neural network and a service that can be used for matching patients. The project’s landing page, www.gestaltmatcher.org, redirects to separate pages for each category. The web service for matching patients is based on Enc-F2G and is accessible for health care professionals. Parts of this service are proprietary and cannot be shared. However, the architecture of the CNN, as well as the code for evaluation, is available under a creative commons license.
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This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through individual grants to P.M.K. (grant nos. KR 3985/7-3, KR 3985/6-1). M.M.N. and R.C.B. are supported by the DFG through grants under the auspices of the Germany Excellence Strategy (grant nos. EXC2151–390873048, ImmunoSensation2). A. Schmidt received additional support by the BONFOR program of the Medical Faculty of the University of Bonn (grant no. 2020-1A-15). We also acknowledge support from the TRANSLATE-NAMSE project. We are also grateful for the language editing provided by N. Ruff.
A.B.-H., N.F. and G.B. are employees of FDNA. T.K. is an employee of GeneTalk GmbH. M.A.M. is a participant in the BIH Charité Digital Clinician Scientist Program founded by the late Prof. Duska Dragun and funded by the Charité-Universitätsmedizin Berlin and the Berlin Institute of Health. M.M.N. reported receiving personal fees from the Lundbeck Foundation, Robert Bosch Stiftung, Shire GmbH, Life & Brain GmbH and HMG Systems Engineering GmbH outside the submitted work. The other authors declare no conflicts of interest.
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Extended Data Fig. 1 Performance improvement of double syndromes and double subjects when using different base sample sizes with Face2Gene models and the Face2Gene rare set.
Base sample size is calculated as the number of subjects multiplied by the number of syndromes. For example, the point of 40 subjects and 10 syndromes has sample size of 400, and it equals both the point of 10 subjects and 40 syndromes and the point of 20 subjects and 20 syndromes. ΔTop-10 accuracy is the difference of accuracy between the double syndromes or subjects and the base point, and is calculated based on Fig. 3. Take the two points annotated in the figure as two examples. The base point is 10 subjects and 40 syndromes with sample size 400. The upper indicated point is subtracting the point of 10 subjects and 40 syndromes from the point of 10 subjects and 80 syndromes in Fig. 3. The lower point is subtracting the point of 10 subjects and 40 syndromes from the point of 20 subjects and 40 syndromes in Fig. 3. In this graph, doubling the number of syndromes always improves top-10 accuracy more than doubling the number of subjects, particularly at larger base sample sizes. Thus, adding more syndromes is more effective than adding more subjects when enlarging the training set.
The x-axis is the number of syndromes used in model training. The left y-axis shows the average top-10 accuracy for five models, and the error bars show the standard deviation over five models. The right y-axis is the cumulative number of subjects in the training syndromes. Each point is the average of testing five different models with different data splits. The null accuracy is 1.23% (10/816).
Extended Data Fig. 3 Comparison of the pairwise distance distribution between subjects in the same family and subjects in different families with the same disease-causing gene.
The median distance between affected individuals from the same family is 0.522, and the median distance between individuals from different families is 0.823. In the box plots, the center line indicates the median values, and the bottom and top edge of the box are the first (25%) and the third (75%) quartiles. The whiskers extend the data points outside the 1st to the 3rd quartiles. The total number of data points (n) for the same family is 28, and n is 928 for the different families.
Extended Data Fig. 4 Hierarchical clustering of four phenotypic series using a t-SNE projection of the Facial Phenotype Descriptors.
The projection shows clustering of FPDs for Kabuki syndrome, Noonan syndrome, mucopolysaccharidosis, and Cornelia de Lange syndrome.
Extended Data Fig. 5 t-SNE visualization of Facial Phenotype Descriptors of syndromes with or without facial dysmorphism.
a, Ten syndromes with facial dysmorphism. b, Ten syndromes without facial dysmorphism.
Users can upload a patient photo to match against patients in the selected categories and can also visualize the clustering of patients by t-SNE. Access can be requested from www.gestaltmatcher.org. If the category DeepGestalt is selected, only cases with one of the frequent 299 diagnoses that DeepGestalt supports populate the gallery. If category Ultra-rare is chosen, the gallery is populated by cases with one of the 816 diagnoses not supported by DeepGestalt. The category of Undiagnosed Patients is suitable for a research setting if no match with a known disorder could be made (see, for example, PSMC3 in the online demo).
The data were first divided by the number of subjects in each syndrome. Syndromes with more than six subjects were denoted frequent syndromes, and those with six or fewer as rare syndromes. Frequent syndromes were also recognized by DeepGestalt. Each category was further divided into a gallery and a test set. For each frequent syndrome, 90% of subjects were assigned to the gallery and used for model training; the remaining 10% of subjects were kept for validating the model training and were sampled in the test set. We performed 10-fold cross-validation on rare syndromes. In each syndrome, 90% of subjects were assigned to the gallery and 10% of subjects were assigned to the test set.
Within each dataset, frequent syndromes are defined as those with seven or more subjects, and rare syndromes are defined as those with six or fewer subjects.
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Hsieh, TC., Bar-Haim, A., Moosa, S. et al. GestaltMatcher facilitates rare disease matching using facial phenotype descriptors. Nat Genet 54, 349–357 (2022). https://doi.org/10.1038/s41588-021-01010-x
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