Two novel mutations and a neutral polymorphism in EGF-like domains of the fibrillin gene (FBN1): SSCP screening of exons 15-21 in Marfan syndrome patients.
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Adult↗
Biomedical subjects
M E Porteous
Publications and source records attributed to M E Porteous.
Alpha thalassaemia mental retardation (ATR-X): an atypical family.
A novel form of severe, X linked mental retardation associated with alpha thalassaemia (ATR-X syndrome) has recently been described. Two affected cousins are described, one of whom has an unusually mild haematological phenotype. HbH inclusions, which are the hallmark of this disease, were only detected in the peripheral red blood cells after repeated observations.
Adolescent↗
Genetic heterogeneity in hereditary haemorrhagic telangiectasia.
A locus causing hereditary haemorrhagic telangiectasia (HHT) has recently been mapped to 9q34 in four families and designated HHT1. In this paper, the results of a linkage study showing genetic heterogeneity in four families in whom HHT is segregating are reported. All the previously reported 9q34 linked families contain at least one affected member with a symptomatic pulmonary arteriovenous malformation. We postulate that clinical heterogeneity may also be a feature of HHT with a significantly higher predisposition to symptomatic PAVMs associated with the HHT1 linked families.
Chromosome Mapping↗
An association between migrainous aura and hereditary haemorrhagic telangiectasia.
Hereditary haemorrhagic telangiectasia (HHT) is a rare autosomal dominant disorder characterized by a variety of abnormalities of the vasculature. This study investigated by questionnaire an unselected group of 58 patients suffering from HHT to identify and diagnose any headache history. These were compared with a control group comprising 40 patients with an unrelated autosomal dominant disorder, familial adenomatous polyposis. Fifty percent of the HHT patients reported attacks of headache which fulfilled current diagnostic criteria for migraine with aura. This was over four times the figure for the control group and at least 10 times the expected level for a normal population. The auras described by all the affected patients were classic visual disturbances preceding the headaches. Two patients also described typical visual auras unassociated with headache symptoms. The reason for such a clear association between migraine with aura and HHT is uncertain but cerebral arteriovenous malformations seem to be the likely link. A greater understanding of the reasons for the relationship may provide an insight into the pathophysiology of both conditions.
Adult↗
Agnathia-holoprosencephaly: a new recessive syndrome?
The association between agnathia and holoprosencephaly is well documented (Pauli et al., 1981). Pauli et al. described two female sibs with agnathia and holoprosencephaly who were subsequently shown to carry an unbalanced 46,XX, der 18,t(6;18)(pter p24.1) karyotype (Pauli et al., 1983; Krassikoff and Sekhon, 1989). All other cases have been sporadic (Cohen, 1989). We present a recurrence of agnathia-holoprosencephaly in an unrelated European couple and postulate that this association may represent an autosomal recessive syndrome.
Abnormalities, Multiple↗
VACTERL with hydrocephalus: one end of the Fanconi anemia spectrum of anomalies?
Two cases of Fanconi anemia presenting as hydrocephalus are discussed. Both infants had initially been considered to have features of VACTERL. Chromosomal breakage studies should be performed in all cases of VACTERL with hydrocephalus so that Fanconi anemia may be excluded.
Abnormalities, Multiple↗
The gene for Aarskog syndrome is located between DXS255 and DXS566 (Xp11.2-Xq13).
Aarskog syndrome has been mapped to Xq13 on the basis of a patient carrying an Xq13:8p21.2 translocation. We have identified a new microsatellite marker in a clone mapping to this region (HX60;DXS566). Using primers flanking this microsatellite along with primers detecting a microsatellite at PGK1P1 and DXS255, and DXS72, we have performed a multipoint analysis in a large kindred with Aarskog syndrome. Our results suggest that the Aarskog locus lies proximal to Xq13. This is supported by the recent redefining of the breakpoint of the original translocation as between DXS14 (Xp11.21-p11.1) and DXS146 (Xp11.23-p11.22).
Abnormalities, Multiple↗
Hereditary haemorrhagic telangiectasia: a clinical analysis.
Data from 98 patients with hereditary haemorrhagic telangiectasia (HHT) are presented. All were symptomatic by 40 years of age and 62% by 16 years. Nose bleeding was the first symptom of disease in 90% of cases with mucocutaneous telangiectases appearing 5 to 20 years later. Complications of HHT are discussed and an age of onset curve given.
Adolescent↗
Aarskog syndrome.
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Abnormalities, Multiple↗
The non-deletion type of alpha thalassaemia/mental retardation: a recognisable dysmorphic syndrome with X linked inheritance.
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Adult↗
Unknown syndrome. A possible new X linked retardation syndrome: dysmorphic facies, microcephaly, hypotonia, and small genitalia.
The proband, the first child of unrelated parents, was noted in infancy to have microcephaly, developmental delay, dysmorphic facies, hypotonia, a small penis with cryptorchidism, and a fixed flexion deformity of his left index finger. His maternal uncle is severely retarded and has similar dysmorphic facies.
Child, Preschool↗