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At least 469 records · Page 26Linked to original sources
PubMed1991

Abnormal scleral collagen in nanophthalmos. An ultrastructural study.

Ten patients with bilateral nanophthalmos underwent sclerectomies for uveal effusion. Ultrastructural examination of the sclera revealed abnormal collagen in seven patients. Four showed dramatic fraying of the collagen fibrils into fine filaments 2 to 3 nm in diameter. In three of these cases and three other cases without fraying, there were foci of 10- to 35-nm small collagen fibrils, some appearing to arise by splitting of otherwise normal collagen fibrils. In areas of fraying, elastic fibers were absent. All patients had a wider range of collagen diameters than did control subjects. The youngest patient with fraying also had Hallermann-Streiff syndrome. In three patients, no collagen abnormality was found. The clinical feature correlating best with the presence of abnormal collagen was an extremely small eye, since the three patients without collagen abnormality had the largest eyes (range of anteroposterior diameters, 19.2 to 20.3 mm). Nanophthalmos appears to result from several distinct defects.

Adult↗
PubMed1981

Microcephaly, microphthalmia, falciform retinal folds, and blindness. A new syndrome.

We have observed an apparently new, heritable syndrome consisting of severe microcephaly, microphthalmia, falciform retinal folds, and blindness. Two brothers were affected with these problems. The mother, while she has no ocular malformations, has severe microcephaly and mild mental retardation. The only other offspring of the parents, a boy, is normal. Laboratory evaluation of the affected sibs was uninformative. An environmental cause of this condition has been sought, but none has been identified. Possible modes of inheritance include autosomal dominant inheritance with variable expressivity, X-linked recessive inheritance with partial expression in the mother, or autosomal recessive inheritance that is etiologically unrelated to the mother's microcephaly.

Abnormalities, Multiple↗
PubMed1996

Familial arhinia, choanal atresia, and microphthalmia.

We describe two females (aunt and niece) with variable manifestations of arhinia, choanal atresia, microphthalmia, and hypertelorism. In the literature there is only one report on this syndrome in sibs. We hypothesize autosomal dominant inheritance with reduced penetrance.

Adolescent↗
PubMed1997

Microphthalmia, marked short stature, hearing loss, and developmental delay: extension of the phenotype of GOMBO syndrome?

An adult male with microphthalmia, severe developmental delay, conductive hearing loss, marked short stature of prenatal onset, and radiographic skeletal changes is described. A review of the literature, focusing on his major findings, suggests that his manifestations might be an extension of the phenotype of GOMBO (growth retardation, ocular abnormalities, microcephaly, brachydactyly, oligophrenia) syndrome.

Abnormalities, Multiple↗
PubMed1997

Anophthalmia-microphthalmia-oblique clefting syndrome: confirmation of the Fryns anophthalmia syndrome.

We describe a patient with bilateral extreme microphthalmia with bilateral congenital glaucoma, bilateral medial oblique facial cleft ending in lid colobomas, bilateral stenosis of the choanae, bifid uvula, frontal encephalocele, and premature craniosynostosis. The cause is unknown, but the phenotype resembles the Fryns anophthalmia-plus syndrome, which may be a recessive trait, although intrauterine environmental factors cannot be excluded.

Abnormalities, Multiple↗
PubMed1998

Second 46,XX male with MLS syndrome.

We report on a second 46,XX male with microphthalmia with linear skin defects (MLS) syndrome. In addition to microphthalmia and linear skin streaks, he had a secundum ASD, hypospadias with chordee, anal fistula, and agenesis of corpus callosum with colpocephaly. Biopsy of a linear streak showed smooth muscle hamartomata rather than the presumed dermal aplasia. Detailed ophthalmologic examination did not show retinal lacunae typical of Aicardi syndrome. DNA studies with distal Xp specific probes indicated a deletion in one X chromosome and fluorescence in situ hybridization (FISH) studies with X- and Y-specific probes demonstrated the presence of a derivative X chromosome from an X;Y translocation.

Agenesis of Corpus Callosum↗
PubMed1999

Ectopic expression of RET results in microphthalmia and tumors in the retinal pigment epithelium.

The retinal pigment epithelium (RPE) is essential for eye development by interacting with the overlaying neuroepithelium. Regulatory sequences of the gene encoding for tyrosinase-related protein 1 (TRP-1), linked to the lacZ reporter gene, lead to strong and specific beta-galactosidase expression in the RPE. We asked how the oncogene ret would affect this epithelial cell type during mouse development. We used the TRP-1 promoter to express ret in the developing RPE, and obtained transgenic mouse lines, which showed mild to severe microphthalmia. During development, the RPE changed to a stratified epithelium with reduced or absent pigmentation from E10.5 onward. In addition, proliferation of RPE cells and tumor formation were observed from E12.5 onward. These early events prevent closure of choroid fissure and lead to microphthalmia and secondary malformations after birth. We conclude that ret transgene expression in the RPE prevents normal differentiation of this epithelial layer and induces proliferation and tumor formation. The appearance of the microphthalmic phenotype underlines the requirement of a normally developed RPE for eye development.

Animals↗
PubMed2000

Partial rescue of the ocular retardation phenotype by genetic modifiers.

The or(J) allele of the murine ocular retardation mutation is caused by a premature stop codon in the homeodomain of the Chx10 gene. When expressed on an inbred 129/Sv strain, the or(J) phenotype is characterized by microphthalmia and a thin, poorly differentiated retina in which the peripheral portion is affected to a greater extent than the central portion. Such mutant retinae lack differentiated bipolar cells and the optic nerve typically fails to form, leading to blindness. Here, we show that progeny from an outcrossed backcross between 129/Sv-or(J) /or(J) and Mus musculus castaneus produce animals that are homozygous for the or(J) mutation and exhibit a much ameliorated eye phenotype. Although not of normal size, such modified or(J) eyes are significantly larger than those in 129/Sv-or(J) /or(J) mice, and contain a better organized retina which includes bipolar cells. Furthermore, optic nerves are frequently present, and the eyes show a degree of function as reflected by electroretinogram and pupillary response. As in 129/Sv-or(J) /or(J) mice, however, modified or(J) eyes show incomplete growth and a lack of cell differentiation in the periphery of the retina. The selective, and apparently nonmodifiable, effect of the ocular retardation phenotype on the periphery of the retina indicates that Chx10 plays an important role in the central-to-peripheral gradient of retinal development. These findings demonstrate that the ocular retardation phenotype can be greatly modified by the genetic background, and help to define a role for Chx10 in ocular development.

Animals↗
PubMed1977

Pathogenesis of osteopetrosis in the microphthalmic mouse: reduced bone resorption.

Bone resorption, stimulated by injection of parathyroid extract, was measured in vivo in microphthalmic mice as the rate of release of 3H from bone after incorporation of 3H-proline. Bone resorption in these mice, which inherit osteopetrosis, was less than 10% of the in normal litermates. Autoradiography confirmed the reduction in removal of radioactive bone matrix and in bone growth in microphthalmic mice. The ability of these mice to raise the serum calcium concentration in response to PTE was also reduced. These results, that bone resorption is reduced in microphthalmic mice, are discussed in relation to the pathogenesis and cure of the disease.

Animals↗
PubMed1981

The hematogenous origin of osteoclasts: experimental evidence from osteopetrotic (microphthalmic) mice treated with spleen cells from beige mouse donors.

The excessive skeletal mass and reduced bone resorption characteristic of osteopetrosis in microphthalmic (mi) mice can be corrected by irradiation and transfer of spleen cells from a normal littermate. Osteoclasts in beige (bg) mice, a mutation without osteopetrosis, have giant lysosomal granules. These two facts were exploited to trace osteoclast lineage. Microphthalmic mice treated with whole-body irradiation and spleen cells from a beige donor resorbed the excessive skeletal mass and recovered from osteopetrosis. Furthermore, osteoclasts in treated mi mice had giant lysosomal granules and resembled those found in bg donors when examined by light and transmission electron microscopy. These data provide direct evidence for a hematogenous origin of osteoclasts in mammals.

Animals↗
PubMed2002

Combination of diaphragmatic eventration and microphthalmia/anophthalmia is probably nonrandom.

Two sporadic cases of eventration of the diaphragm are reported; one had bilateral colobomatous microphthalmia and the other had anophthalmia. Absence of polydactyly and presence of eventration rather than diaphragmatic hernia helped to exclude Fryns syndrome. These cases together with published cases with overlapping features support the thesis that this combination of defects is nonrandom and of heterogeneous cause. Some cases are due to a pleiotropic gene defect. In other cases, a polytypic developmental field involving an unknown developmental cascade common to the eye and diaphragm may provide a basis for the combination.

Abnormalities, Multiple↗