ClinVar Miner

Submissions for variant NM_000209.4(PDX1):c.725C>T (p.Pro242Leu) (rs193922358)

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Total submissions: 6
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV000455258 SCV000052738 likely benign not specified 2019-02-05 criteria provided, single submitter clinical testing Variant summary: The variant, PDX1 (legacy gene name IPF1) c.725C>T (p.Pro242Leu) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0013 in 134384 control chromosomes, predominantly at a frequency of 0.0022 within the Non-Finnish European subpopulation in the gnomAD database, including 1 homozygote. The observed variant frequency within Non-Finnish European control individuals in the gnomAD database is approximately 1760 fold of the estimated maximal expected allele frequency for a pathogenic variant in PDX1 causing Familial Monogenic Diabetes (Maturity Onset Diabetes of the Young 4)/Neonatal Diabetes Mellitus phenotype, 1.3e-06), strongly suggesting that the variant is a benign polymorphism found primarily in populations of Non-Finnish European origin. Mohan et al (Mohan_2018) state that the variant was found in similar frequencies in MODY cases and in general population in South India and suggests that the variant most likely have little to no effect on risk of developing MODY. The variant c.725C>T has been reported in the literature in individuals affected with MODY (Ang_2016, Chambers_2016). However, these reports do not provide unequivocal conclusions about association of the variant with the disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as likely benign.
Laboratory for Molecular Medicine,Partners HealthCare Personalized Medicine RCV000455258 SCV000540009 uncertain significance not specified 2016-03-28 criteria provided, single submitter clinical testing Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: LP by Labcorp (2011). Low reads. Could not find any publications.
GeneDx RCV000840733 SCV000982671 likely benign not provided 2018-03-22 criteria provided, single submitter clinical testing This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.
Invitae RCV000840733 SCV001121499 likely benign not provided 2019-12-31 criteria provided, single submitter clinical testing
Athena Diagnostics Inc RCV000455258 SCV001476620 benign not specified 2019-11-01 criteria provided, single submitter clinical testing
Broad Institute Rare Disease Group, Broad Institute RCV001249016 SCV001422872 benign Maturity-onset diabetes of the young type 4 2020-01-22 no assertion criteria provided curation The p.Pro242Leu variant in PDX1 has been reported in at least 1 Asian individual with maturity-onset diabetes of the young type 4 (PMID: 27420379), and has been identified in 0.2% (124/58140) of European (non-Finnish) chromosomes and multiple other populations at lower frequencies by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs193922358). This variant has been seen in the general population at a frequency high enough to rule out a pathogenic role. This variant has also been reported in ClinVar as having conflicting interpretations of pathogenicity (Variation ID: 36411). Computational prediction tools, including splice predictors, and conservation analyses suggest that this variant may not impact the protein, though this information is not predictive enough to rule out pathogenicity. In summary, this variant meets criteria to be classified as benign for MODY type 4 in an autosomal dominant manner based on computational tool predictions and the frequency of this variant in multiple populations. ACMG/AMP Criteria applied: BP4, BA1 (Richards 2015).

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