An inv ins(7;2)(q21.2;q3105q24.2) was found to segregate through four generations of a family. Adjacent-1 segregation aneusomies were ascertained in five patients: three monosomics and two trisomics; and the corresponding syndromes were delineated. The comparative analysis between these and other previously described 2q aneusomic individuals led to the conclusion that a large cleft between first and second toes is a constant feature in monosomy 2q24----q31. No other trait could plausibly be mapped. Risks of 7.9 to 31.6% for aneusomic children and of 26.3% for abortion were estimated in the present family.
A 2‐month‐old boy with delayed growth and development, brachycephaly, large anterior fontanelle, low‐set folded ears, micrognathia, aortic coarctation, floppy abdominal muscles, and pes varus, was found to have a 46, XY, del(16)(q2100q2300) de novo karyotype. This observation corroborates both the distinctness of the 16q monosomy syndrome and the pathogenetic role of the band 16q21.
An inv(1) (p3500q21.3) was found in an azoospermic man, his mother and two other maternal relatives. Although the mechanisms involved are still unclear, it is stressed that pericentric inversions of chromosome 1 in which the inverted chromosome becomes submetacentric (centromeric index less than or equal to 0.324) apparently impair spermatogenesis.
A t(X;3) (q26;q13.2) was found in three generations of a family. Female carriers exhibited normal reproductive function, whereas all three postpuberal male carriers showed spermatogenesis arrest at meiosis I. Additionally, a 2 3/12-year-old girl had duplication 3qter resulting from an adjacent-1 segregation.
A 7 7/12‐year‐old girl with a de novo deletion 4p15.32→ pter without the typical Wolf‐Hirschhorn syndrome (WHS) is presented. This observation and others from medical literature suggest that monosomy 4p15.31→ 4p15.32, rather than 4p16, is the cause of the typical WHS.
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