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Biomedical subjects

A S Teebi

Publications and source records attributed to A S Teebi.

At least 19 recordsLinked to original sources
PubMed2005

A family exhibiting arterial tortuosity syndrome displays homozygosity for markers in the arterial tortuosity locus at chromosome 20q13.

Arterial tortuosity associated with hyperextensible skin and hypermobility of joints, features that are characteristics of Ehlers-Danlos syndrome (EDS), has been described in several families. An arterial tortuosity locus has recently been mapped to chromosome 20q13. Here, we report a consanguineous Kurdish family in which an affected child manifested elongation and severe tortuosity of the aorta, carotid, and other arteries. Additional clinical symptoms include loose skin, hypermobile joints, hernias, and facial features that resemble EDS individuals. To examine whether the arterial tortuosity locus was involved in this child, homozygosity analysis was performed using microsatellite markers on 20q13. The affected child was found homozygous, whereas the unaffected parents and three siblings were heterozygous. Additional typing defined the genomic interval to a 37-cm region within which the arterial tortuosity locus is located. Three functional candidate genes (B4GALT5, KCNB1, and PTGIS) were sequenced. No mutations were discovered in the coding regions of these three genes and the promoter regions of B4GALT5 and KCNB1 genes. Moreover, the B4GALT5 mRNA expression was unaltered in patient-derived lymphoblastoid cells. In the PTGIS gene promoter, the affected child was homozygous for eight variable number of tandem repeats, while parents and unaffected siblings carried six repeats.

Angiography↗
PubMed2004

Decreased expression of lysyl hydroxylase 2 (LH2) in skin fibroblasts from three Ehlers-Danlos patients does not result from mutations in either the coding or proximal promoter region of the LH2 gene.

The Ehlers-Danlos syndromes (EDS) are a heterogeneous group of inherited connective tissue disorders characterized by tissue fragility, hyperelasticity of the skin and joint hypermobility. This phenotype, accompanied by kyphoscoliosis and/or ocular fragility, is present in patients with the autosomal recessive type VI form of EDS. These patients have significantly decreased levels of lysyl hydroxylase (LH) activity, due to mutations in the LH1 gene. LH hydroxylates specific lysine residues in the collagen molecule that are precursors for the formation of cross-links which provide collagen with its tensile strength. No disorder has been directly linked to decreased expression of LH2 and LH3, two other isoforms of LH. This study describes 3 patients with mixed phenotypes of EDS, who have significantly decreased mRNAs for LH2, but normal levels of LH1 and LH3 mRNAs, in their skin fibroblasts. In contrast to the effect of LH1 deficiency in EDS VI patients, the decreased expression of LH2 does not affect LH activity, bifunctional collagen cross-links (measured after reduction as dihydroxylysinonorleucine (DHLNL) and hydroxylysinonorleucine (HLNL)), or helical lysine hydroxylation in these cell lines. Sequence analysis of full length LH2 cDNAs and 1kb of the promoter region of LH2 does not show mutations that could explain the decreased expression of LH2. These results suggest that the deficiency of LH2 in these fibroblasts may be caused by changes in other factors required for the expression of LH2.

Cell Line↗
PubMed2004

The locus responsible for horizontal gaze palsy/progressive scoliosis and brainstem hypoplasia is refined to a 9-cM region on chromosome 11q23.

Horizontal gaze palsy associated with progressive scoliosis (HGPS) is a rare autosomal recessive condition that has been recently mapped to a 30-cM region on chromosome 11q23-25. In this report, we describe a consanguineous family in which three of five sibs are affected with HGPS. In two of the affected sibs, there was significant cognitive delay in addition to congenital horizontal gaze palsy and childhood onset scoliosis. In all three affected sibs, magnetic resonance imaging (MRI) scans revealed brainstem hypoplasia, a finding that has recently been associated with HGPS. Clinical examination of the family showed no significant dysmorphic features, while karyotyping, EMG, nerve conduction, and muscle biopsies were unrevealing. Homozygosity mapping was performed to narrow the disease locus on 11q23-25. A recombination event was observed in one affected sib between markers D11S1345 and D11S4464, which further refined the region to a 9-cM interval. Since the MRI results provide support for the theory that maldevelopment of neurons in the abducens nuclei and caudal longitudinal fascicle is the cause for HGPS, we speculate on the existence of a gene in this 9-cM interval on chromosome 11q23, which is critical for brainstem development.

Adolescent↗
PubMed2003

A new type of Ehlers-Danlos syndrome associated with tortuous systemic arteries in a large kindred from Qatar.

AIM: To describe the clinical spectrum of anomalies of a new type of Ehlers-Danlos syndrome in 32 patients from a large inter-related extended family in Qatar. METHODS: Among the 32 patients (from 22 families), there were 6 affected pairs of siblings and 2 families with 3 affected siblings. The male to female ratio was 2:1, ages ranging from birth to 18 y (mean 7.4 y). RESULTS: Anomalies included a variable degree of skin hyperextensibility, hypermobility of small and large joints, and tortuous systemic arteries. Peculiar facial features included epicanthic folds, flat saggy cheeks, elongated faces and micrognathia. The combination of an elongated aortic arch and tortuous brachiocephalic arteries was seen in 30 patients (93.8%), aneurysm of the ascending aorta in 3 patients (9.4%), bifid pulmonary artery in 27 patients (84.4%) and multiple severe peripheral stenosis of the right and/or left pulmonary artery in 7 patients (21.9%). A prominent aortic knuckle was observed on the chest roentgenograms of 30 patients (93.8%); inguinal hernia in 11 patients (34%), diaphragmatic hernia and/or hiatus hernia in 7 patients (21.9%); and laryngo-tracheomalacia in 2 patients (6.3%). Generalized muscle hypotonia was found in 15 neonates (46.9%). Parental consanguinity involved in all the patients was traced to a common ancestor from a large Bedouin tribe in Qatar. These patients are at risk for potentially catastrophic arterial rupture. Linkage to the major loci involved in Ehlers-Danlos syndrome and other connective tissue disorders, such as Cutis Laxa, Familial Aneurysm, and Osteogenesis imperfecta, was excluded by using specific DNA markers, confirming the uniqueness of this disorder. CONCLUSION: The study describes a large cohort of patients from the same closely related family, sharing peculiar dysmorphisim and consistent radiological and echocardiographic features different from known types of Ehlers-Danlos syndrome. As known loci involved in Ehlers-Danlos syndrome and other connective tissue disorders were excluded by specific DNA markers, this appears to be a new type of Ehlers-Danlos syndrome or even a new syndrome.

Adolescent↗
PubMed2002

Mutation in the cartilage-derived morphogenetic protein-1 (CDMP1) gene in a kindred affected with fibular hypoplasia and complex brachydactyly (DuPan syndrome).

The present authors have previously described a consanguineous Pakistani family with fibular hypoplasia and complex brachydactyly (DuPan syndrome) inherited as an autosomal recessive trait. All affected individuals showed either reductions or absence of bones in the limbs, and appendicular bone dysmorphogenesis with unaffected axial bones. Obligate heterozygote parents were phenotypically normal. Mutations in the cartilage-derived morphogenetic protein 1 (CDMP1) gene have been reported in two acromesomelic chondrodysplasias (i.e. Hunter-Thompson type and Grebe type) which are phenotypically related to DuPan syndrome. CDMP1, a member of the transforming growth factor beta super-family of secreted signalling molecules, has been reported to regulate limb patterning and distal bone growth. Therefore, the present authors examined genomic DNA from the family with DuPan syndrome for mutations in the CDMP1 gene. Affected individuals were homozygous for a missense mutation, T1322C, in the coding region of the CDMP1 gene. This mutation was not found in 44 control subjects of Pakistani origin. The T1322C change predicts a leu441pro substitution in the mature domain of the CDMP1 protein. This is likely to cause a conformational change in the CDMP1 protein that influences the expression of genes which are required for normal bone development. This finding extends the spectrum of phenotypes produced by defects in the CDMP1 gene.

Bone Morphogenetic Proteins↗
PubMed2001

Trigonomicrocephaly, severe micrognathia, large ears, atrioventricular septal defect, symmetrical cutaneous syndactyly of hands and feet, and multiple café-au-lait spots: new acrocraniofacial dysostosis syndrome?

We report on a patient with a unique constellation of anomalies comprising trigonomicrocephaly, asymmetric severe micrognathia, large ears, atrioventricular septal defect, vertebral anomalies, bilateral cutaneous syndactyly of fingers and toes, unilateral cryptorchidism and multiple café-au-lait spots. The mother of the propositus has multiple café-au-lait spots. Search of POSSUM and the London Dysmorphology Database (LDDB) uncovered no similar case. We think that this patient represents a new acrocraniofacial dysostosis syndrome.

Abnormalities, Multiple↗
PubMed2001

Progressive erosive arthropathy with contractures, multicentric osteolysis-like changes, characteristic craniofacial appearance, and dermatological abnormalities: a new syndrome?

We report a 27-year-old man with an apparently new syndromic form of progressive erosive arthropathy and contractures of small and large joints associated with mild epiphyseal changes, normal vertebrae, and generalized osteopenia. The patient had a characteristic craniofacial appearance, dermatological abnormalities, and normal intelligence. The head was large with frontal bossing. The face was elongated with malar hypoplasia, thin upper lip, prominent lower jaw, high arched palate, dental malocclusion, and prominent ears with absent ear lobules. Dermatological abnormalities included malar erythema and facial telangiectasia together with multiple nevi and lentigenes all over the body. Pseudorheumatoid arthropathy, spondyloarthropathy, and Borrone dermatocardioskeletal syndrome were considered in the differential diagnosis and were excluded. Also, no similar cases have been found in POSSUM or the London Dysmorphology databases.

Abnormalities, Multiple↗
PubMed2001

Brachycephaly, cutis aplasia congenita, blue sclerae, hypertelorism, polydactyly, hypoplastic nipples, failure to thrive, and developmental delay: a distinct autosomal recessive syndrome?

We report a 6-year-old male of first cousin parents with the unique constellation of frontal bossing with brachycephaly, cutis aplasia congenita, blue sclerae, hypertelorism, hypoplastic nipples, rudimentary unilateral post-axial polydactyly of the hand, failure to thrive, mild to moderate developmental delay and sociable personality. Knoblock-Layer syndrome and Smith-Lemli-Opitz syndrome were considered in the differential diagnosis and were excluded. No similar cases were found in LDDB or other databases.

Abnormalities, Multiple↗
PubMed2000

Transverse limb defects associated with aorto-pulmonary vascular abnormalities: vascular disruption sequence or atypical presentation of Adams-Oliver syndrome?

We report a patient with terminal transverse limb defects associated with persistent primitive aorto-pulmonary vascular connections leading to supra-systemic pulmonary artery pressure. It is likely that this patient represents a vascular disruption sequence or as an alternative a form of Adams-Oliver syndrome. These assumptions are based only on the association of vascular abnormalities as an emerging and apparently important association with transverse limb defects despite the absence of aplasia cutis congenita commonly associated with Adams-Oliver syndrome.

Aorta↗
PubMed2000

New autosomal dominant syndrome reminiscent of Coffin-Siris syndrome and Brachymorphism-Onychodysplasia-Dysphalangism syndrome.

We report a man and his two daughters (one stillborn) with an apparently unique constellation of anomalies including fifth finger/toe terminal phalanx and nail hypoplasia. The craniofacial manifestations include large boxy head, round face, hypertelorism with downslanting palpebral fissures and wide mouth. Other manifestations include brachydactyly, fifth finger clinodactyly and ventricular septal defect. Intelligence is normal. The resemblance to Coffin-Siris, Brachymorphism-Onychodysplasia-Dysphalangism and DOOR syndromes is discussed and we concluded that this family probably represents a new autosomal dominant syndrome.

Abnormalities, Multiple↗
PubMed1999

Choanal and ileal atresia: a new syndrome or association?

Choanal atresia is a relatively common congenital malformation which is often associated with other anomalies. On the other hand, ileal atresia is very rare, mostly nonsyndromic and occasionally associated with other anomalies. The association of choanal and ileal atresia is unknown. Here we report the first instance of bilateral choanal atresia and ileal atresia in a full term male infant and describe the subsequent surgical treatment of both conditions. The association is unique and may represent a syndrome.

Abnormalities, Multiple↗
PubMed1999

Dyskeratosis congenita: an autosomal recessive variant.

We describe a woman with dyskeratosis congenita (DKC), microcephaly, and a purple discoloration of the tongue. The latter findings are not commonly described in males with DKC, have been reported in another female patient with this condition, and may represent the phenotype of an autosomal recessive entity of DKC. Results of X chromosome inactivation studies did not support X-linked DKC in our family. The additional findings of an affected brother and parental consanguinity support the hypothesis of autosomal recessive inheritance.

Adolescent↗