Are all phenotypically-normal Turner syndrome fetuses mosaics? 1996

A Amiel, and D Kidron, and I Kedar, and E Gaber, and O Reish, and M D Fejgin
Genetic Institute, Department of Pathology, Meir Hospital, Sapir Medical Center, Kfar-Saba, Israel.

Cytogenetic and fluorescent in situ hybridization (FISH) studies were performed on several formalin-fixed tissues obtained from four fetuses diagnosed at amniocentesis as 45,XO-Turner syndrome. Three of the four were phenotypically normal and one had malformations. The three phenotypically normal cases were found to have an additional normal cell line, which may explain their ability to survive, at least to the time of pregnancy termination well into the second trimester. The abnormal 45,XO fetus was not found to be mosaic in all of the tissues examined. In 45,XO cases in which no malformation is detected, the possibility of mosaicism should be raised and thus the counselling should be modified accordingly.

UI MeSH Term Description Entries
D009030 Mosaicism The occurrence in an individual of two or more cell populations of different chromosomal constitutions, derived from a single ZYGOTE, as opposed to CHIMERISM in which the different cell populations are derived from more than one zygote.
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D002452 Cell Count The number of CELLS of a specific kind, usually measured per unit volume or area of sample. Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D003582 Cytogenetics A subdiscipline of genetics which deals with the cytological and molecular analysis of the CHROMOSOMES, and location of the GENES on chromosomes, and the movements of chromosomes during the CELL CYCLE. Cytogenetic
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012729 Sex Chromosome Aberrations Abnormal number or structure of the SEX CHROMOSOMES. Some sex chromosome aberrations are associated with SEX CHROMOSOME DISORDERS and SEX CHROMOSOME DISORDERS OF SEX DEVELOPMENT. Sex Chromosome Abnormalities,Abnormalities, Sex Chromosome,Chromosome Abnormalities, Sex,Aberration, Sex Chromosome,Aberrations, Sex Chromosome,Abnormality, Sex Chromosome,Chromosome Aberration, Sex,Chromosome Aberrations, Sex,Chromosome Abnormality, Sex,Sex Chromosome Aberration,Sex Chromosome Abnormality
D014424 Turner Syndrome A syndrome of defective gonadal development in phenotypic females associated with the karyotype 45,X (or 45,XO). Patients generally are of short stature with undifferentiated GONADS (streak gonads), SEXUAL INFANTILISM, HYPOGONADISM, webbing of the neck, cubitus valgus, elevated GONADOTROPINS, decreased ESTRADIOL level in blood, and CONGENITAL HEART DEFECTS. NOONAN SYNDROME (also called Pseudo-Turner Syndrome and Male Turner Syndrome) resembles this disorder; however, it occurs in males and females with a normal karyotype and is inherited as an autosomal dominant. Bonnevie-Ullrich Syndrome,Gonadal Dysgenesis, 45,X,Gonadal Dysgenesis, XO,Monosomy X,Status Bonnevie-Ullrich,Turner's Syndrome,Ullrich-Turner Syndrome,Bonnevie Ullrich Syndrome,Status Bonnevie Ullrich,Syndrome, Ullrich-Turner,Turners Syndrome,Ullrich Turner Syndrome,XO Gonadal Dysgenesis
D014960 X Chromosome The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in human and other male-heterogametic species. Chromosome, X,Chromosomes, X,X Chromosomes

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