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. 1996 Jan;58(1):182–190.

Familial recurrence-pattern analysis of nonsyndromic isolated cleft palate--a Danish Registry study.

K Christensen 1, L E Mitchell 1
PMCID: PMC1914943  PMID: 8554055

Abstract

The finding of an association between genetic variation at the transforming growth-factor alpha (TGFA) locus and nonsyndromic isolated cleft palate (CP) represents a potentially important breakthrough in our understanding of this condition. The present study was undertaken to assess the feasibility of detecting linkage to putative CP-susceptibility loci, such as TGFA. To this end, the familial recurrence pattern for CP was evaluated to determine the most likely mode of inheritance for this condition. The study took advantage of the high ascertainment and uniform registration of CP in Denmark. In addition, the study utilized estimates of familial recurrence that were obtained by register linkage and, hence, were not subject to either recall bias or the potentially biasing influence of nonresponders. The recurrence risks for first-, second-, and third-degree relatives of 1,364 nonsyndromic CP probands were estimated to be 2.74% (72/2,628), 0.28% (3/1,068), and 0.00% (0/360), respectively. These estimates are close to published estimates based on questionnaire and interview data. The population prevalence for nonsyndromic CP was, however, found to be considerable higher than usually reported (0.058% [1,456/2,523,023]). Analyses of these and previously published data, using the method presented by Risch, indicated that major-locus or additive multilocus inheritance of CP is unlikely. The familial recurrence pattern was, however, consistent with CP being determined by several interacting loci. Under such a model, a single locus accounting for more than a sixfold increase in the risk to first-degree relatives of CP probands is unlikely, whereas a single locus accounting for a threefold increase provided a good fit to the data. Such a locus could be detected in a realistic sample of affected sib pairs.

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Selected References

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