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  • Title: Genetic analysis of cleft lip with or without cleft palate in Madras, India.
    Author: Nemana LJ, Marazita ML, Melnick M.
    Journal: Am J Med Genet; 1992 Jan 01; 42(1):5-9. PubMed ID: 1308365.
    Abstract:
    We performed a genetic analysis of 331 non-syndromic cleft lip with or without cleft palate (CL +/- P) proband families ascertained in Madras, India. Predictions of the multifactorial threshold (MF/T) model are tested; goodness-of-fit tests of the MF/T model and complex segregation analysis are also utilized to clarify the genetic etiology of CL +/- P in this study population. There was little evidence for the MF/T model. The most reasonable conclusion from mixed model analysis is that of a major locus with reduced transmission probability. This is not altogether surprising if manifestation of CL +/- P also depends on in utero exposure to harmful environmental agents during the critical period of facial development, as suggested by Melnick et al. [1980] and demonstrated in an animal model of CL +/- P [Melnick et al., 1981]. Further the results in the Madras population are quite similar to those in other populations of Europe and Asia.
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