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Both genetic and environmental factors account for individual differences in reading and spelling abilities (Little et al. in Behav Genet 47:52\u201376, 2017. 10.1007\/s10519-016-9810-6), but there is some evidence that genetic factors can be moderated by environmental factors, many of which relate to differences in socio-economic status (SES). Studies in the US indicate that the heritability of reading and spelling abilities is higher in higher SES environments (Hart et al. in J Child Psychol Psychiatry 54(10):1047\u20131055, 2013. 10.1111\/jcpp.12083; Friend et al. in Psychol Sci 19(11), 2008. 10.1111\/j.1467-9280.2008.02213.x). Because countries differ in terms of factors such as education access and social mobility, the genetics (or simply gene) x SES interaction may or may not be present in other populations. Here, we utilise summary statistics from a well-powered genome-wide association study on dyslexia (Doust et al. in Nat Genet 54:1621\u20131629, 2022. 10.1038\/s41588-022-01192-y) to construct polygenic indices in two cohorts of children\/adolescents in Australia (N\u2009=\u20091315) and the United Kingdom (N\u2009=\u20095461 at age 7; N\u2009=\u20094306 at age 16), and test whether the effect of measured genes on variation in reading ability is moderated by family SES. While polygenic indices and SES both showed statistically significant effects on reading and spelling performance, no interaction effect was found. These results are contrary to results of some twin studies in the United States that have found an interaction effect. Yet, these findings support the broader literature on gene x SES interaction that mostly report no such interaction in other cognitive traits outside the United States suggesting country differences in how strongly SES relates to education quality.<\/jats:p>","DOI":"10.1007\/s10519-025-10230-4","type":"journal-article","created":{"date-parts":[[2025,9,24]],"date-time":"2025-09-24T07:34:43Z","timestamp":1758699283000},"page":"395-406","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Dyslexia Polygenic Index and Socio-Economic Status Interaction Effects on Reading Skills in Australia and the United 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