Somatic and intellectual development in a patient with 47,XX,psu dic(X)(p11.2) chromosome constitution.
An unusual form of X chromosome aneuploidy, 47,XX,psu dic(X)(p11.2), was found during an evaluation for short stature of a prepubertal girl. Unlike 45,X, 47,XXX, 48,XXXX, and 49,XXXXX females, this patient is phenotypically normal except for her short stature, which appears to be unrelated to her chromosome abnormality. X chromosome inactivation studies disclosed inactivation (late replication) of one normal X and the abnormal X chromosome in all cells examined from this patient. Therefore, she is disomic for early-replicating distal Xp loci, found in inactivated X chromosomes, and thought to remain active after lyonization. These data suggest that the presence of three or more copies of the early-replicating, active Xp loci may be responsible for the cognitive deficits and other phenotypic abnormalities seen in and other phenotypic abnormalities seen in polysomy X females.
Department of Pediatrics, Stanford University Medical Center, California.
I
I
Ocrant
C D
CD
Bangs
K M
KM
Johnston
D M
DM
Wilson
R L
RL
Hintz
R G
RG
Rosenfeld
T A
TA
Donlon
D000782:Aneuploidy; D001827:Body Height; D002648:Child; D002871:Chromosome Banding; D004303:Dosage Compensation, Genetic; D005260:Female; D006130:Growth Disorders / Q000235:genetics* / Q000523:psychology; D006801:Humans; D007360:Intelligence; D005810:Multigene Family; D010641:Phenotype; D011296:Prenatal Diagnosis; D014960:X Chromosome