{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,13]],"date-time":"2026-09-13T11:13:37Z","timestamp":1789298017902,"version":"build-2803163510"},"reference-count":28,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T00:00:00Z","timestamp":1626393600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["American J of Med Genetics Pt C"],"published-print":{"date-parts":[[2021,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Several Mendelian disorders follow an autosomal recessive inheritance pattern. Epidemiological information on many inherited disorders may be useful to guide health policies for rare diseases, but it is often inadequate, particularly in developing countries. We aimed to calculate the carrier frequencies of rare autosomal recessive Mendelian diseases in a cohort of Brazilian patients using whole exome sequencing (WES). We reviewed the molecular findings of WES from 320 symptomatic patients who had carrier status for recessive diseases. Using the Hardy\u2013Weinberg equation, we estimated recessive disease frequencies (<jats:italic>q<\/jats:italic><jats:sup>2<\/jats:sup>) considering the respective carrier frequencies (2pq) observed in our study. We calculated the sensitivity of carrier screening tests based on lists of genes from five different clinical laboratories that offer them in Brazil. A total of 425 occurrences of 351 rare variants were reported in 278 different genes from 230 patients (71.9%). Almost half (48.8%) were carriers of at least one heterozygous pathogenic\/likely pathogenic variant for rare metabolic disorders, while 25.9% of epilepsy, 18.1% of intellectual disabilities, 15.6% of skeletal disorders, 10.9% immune disorders, and 9.1% of hearing loss. We estimated that an average of 67% of the variants would not have been detected by carrier screening panels. The combined frequencies of autosomal recessive diseases were estimated to be 26.39\/10,000 (or ~0.26%). This study shows the potential research utility of WES to determine carrier status, which may be a possible strategy to evaluate the clinical and social burden of recessive diseases at the population level and guide the optimization of carrier screening panels.<\/jats:p>","DOI":"10.1002\/ajmg.c.31932","type":"journal-article","created":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T10:48:37Z","timestamp":1626432517000},"page":"364-372","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Frequency of carriers for rare recessive Mendelian diseases in a Brazilian cohort of 320 patients"],"prefix":"10.1002","volume":"187","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2873-2820","authenticated-orcid":false,"given":"Caio Robledo D'Angioli Costa","family":"Quaio","sequence":"first","affiliation":[{"name":"Instituto da Crianca (Children's Hospital), Hospital das Clinicas HCFMUSP Faculdade de Medicina da Universidade 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