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Unexpected phenotype in a patient with two chromosomal deletions involving 6pter and 22q11.

The 6p terminal deletions are rare and usually early diagnosed because of their association with eye and cranio-facial anomalies, particularly as part of Axenfeld-Rieger syndrome in relation with the haploinsufficiency of FOXC1 gene. Deletions in the 22q11 region are frequent, highly correlated with DiGeorge syndrome also named CATCH22, and may be associated with many clinical features of various severities. We report a 31-year-old man with an unbalanced 45,XY,der(6)t(6;22)(p25;q11.2),-22 karyotype leading to monosomies in both 6p25 and 22q11 regions, confirmed by FISH and array-CGH. The length of the deletions was respectively 770 Kb for 6pter and 2.9 Mb for 22q11. This karyotype was discovered at adult age following problems of fertility. The chromosomal formula was unexpected, regarding the patient's medical history and clinical features. This case makes a great example of the difficulties to correlate genotype and phenotype, and furthermore demonstrates the complexity of genetic counselling even in a case with two different chromosomal unbalances.

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