A case of childhood acute myeloid leukemia associated with inversion (7)(p21q31)

Inheritance of pericentric inversion in chromosome 7 through the three progenies and a newborn with congenital hydronephrosis diagnosed prenatally by fetal urine sampling

OBJECTIVE

To report the inheritance of a pericentric inversion in chromosome 7 through the three progenies, congenital hydronephrosis, and recurrent miscarriages in an extended family.

DESIGN

Case report.

SETTING

Medical Faculty of Cukurova University in Turkey.

PATIENT(S)

Referred by obstetrics and gynecology clinic.

INTERVENTION(S)

Fetal urine and lymphocytic karyotype.

MAIN OUTCOME MEASURE(S)

Chromosomal analysis from fetal urine and peripheral blood lymphocytes were performed according to standard cytogenetic methods.

RESULT(S)

We assessed an extended family in which a large pericentric inversion in chromosome 7 is segregating; one of the three progenies with the karyotype 46,XY,inv(7)(p22;q22) was heterozygote for the inversion and presented with congenital hydronephrosis. His mother, mother's brother, grandfather, grandfather's brother, and his daughter were similar for the inversion.

CONCLUSION(S)

This case describes the further molecular characterization of these breakpoints on the short or long arm of chromosome 7(p22-q22). The inv(7) is also associated with fetal wastage and may be playing a role in the etiology of the family's miscarriages. These findings can be used in clinical genetics and may be an effective tool for reproductive guidance and genetic counseling.

Chromosomal abnormalities in T-cell large granular lymphocyte leukaemia: report of two cases and review of the literature

Cytogenetic information on T-cell large granular lymphocyte leukaemia (T-LGL; large granular lymphocytosis) is limited. We report two cases of T-LGL with unusual karyotypic aberrations. The first case showed a novel inv(7)(p15q22) as the sole chromosomal abnormality, while the second case showed an inv(14)(q11q32) with evidence of clonal evolution. The breakpoints 7p14-p15 and 14q11 coincide with the T-cell receptor (TCR)-gamma and TCR-alpha/TCR-delta gene loci respectively. This is the first report describing the possible involvement of T-cell receptor genes in karyotypic aberrations in T-LGL.