Baraitser-Winter syndrome

Qu'est-ce que Baraitser-Winter syndrome?

Baraitser-Winter est une maladie génétique caractérisée par un certain nombre de caractéristiques faciales uniques et d'autres maladies cardiaques. Il a été identifié pour la première fois dans 1988.

C'est une anomalie congénitale multiple syndrome, ce qui signifie qu'il est présent à la naissance et affecte plusieurs parties du corps.

le syndrome affecte le développement de la matière grise du cerveau, et la déficience intellectuelle est l'une des caractéristiques de la syndrome.

Cette syndrome est aussi connu comme :
Colobome de l'iris avec hypertélorisme ptosis et retard mental ; Ramer syndrome

Quelles sont les causes des changements génétiques Baraitser-Winter syndrome?

Les dommages aux gènes ACTB et ACTG1 sur les chromosomes 7 et 17 respectivement sont responsables de la maladie.

La majorité des cas sont des mutations de novo et la condition n'est pas héréditaire.

Dans certains cas, un syndrome génétique peut être le résultat d'une mutation de novo et le premier cas d'une famille. Dans ce cas, il s'agit d'une nouvelle mutation génique qui se produit pendant le processus de reproduction.

Quels sont les principaux symptômes de Baraitser-Winter syndrome?

Une déficience intellectuelle, un retard de développement et une élocution limitée à zéro sont quelques-uns des symptômes les plus graves du syndrome.

Le développement anormal de la matière grise du cerveau est également une condition majeure associée à ce syndrome particulier et ce développement anormal est en corrélation avec la gravité de la déficience intellectuelle.

Les caractéristiques faciales uniques du syndrome comprennent une petite tête, des yeux largement espacés, des paupières tombantes, un front étroit, une crête au milieu du front, une large bouche, des sourcils arqués, un nez court, un bout plat du nez, un long philtrum et une fente labiale ou palatine.

D'autres problèmes de santé possibles associés au syndrome comprennent la perte auditive, l'épilepsie, les malformations cardiaques et les hernies.

Comment quelqu'un se fait-il tester pour Baraitser-Winter syndrome?

Les premiers tests de Baraitser-Winter syndrome syndrome peut commencer par un dépistage par analyse faciale, en passant par le FDNA Telehealth plateforme de télégénétique, qui permet d'identifier les marqueurs clés de la syndrome et souligner la nécessité de tests supplémentaires. Une consultation avec un conseiller génétique puis un généticien suivra.

Sur la base de cette consultation clinique avec un généticien, les différentes options pour les tests génétiques seront partagées et le consentement sera recherché pour des tests supplémentaires.

Informations médicales sur Baraitser-Winter syndrome

Fryns and Aftimos (2000) reported two unrelated males with a similar pattern of malformations. Both were males and presented at birth with facial oedema. There was significant weight loss in the neonatal period. In the postnatal period the skin was loose and hyperextensible, most evident in the arms. There was neck webbing, ptosis of the eyelids, and a low posterior hairline with a broad thorax and widely spaced nipples which at first suggested a diagnosis of Noonan syndrome. At the age of 3-5 years seizures became apparent which were difficult to control. CT and MRI scans showed pachygyria, most pronounced in the frontal lobes. Before the seizures developed, psychomotor development was mild to moderately delayed, but after the onset of seizures there was deterioration. Both males were profoundly mentally retarded. There was an unusual body habitus, with some truncal obesity, tip-toe walking, and limited extension of the knees and elbows. Similar cases were reported by Guion-Almedia and Richieri-Costa (1992, 2001), Masuno et al., (2000) and Der Kaloustian et al., (2001). See also the comments by Winter (2001) about this group of syndromes. Additional features include craniosynostosis, cerebral atrophy, agenesis of the corpus callosum, short stature, and degrees of preaxial polydactyly. Please see ' Baraitser-Winter syndrome' - for something similar or the same. NOTE - in the paper (Riviere et al., 2012) patient 1 in the Fryns and Aftimos (2000) report has been found to have a ACTB mutation as found in the Baraitser-Winter syndrome.
Milunsky and Capin (2003) reported a 12 year old boy with features of the condition. They proposed the name cerebro-oculo-facial-lymphatic syndrome, in our view misleading as there are no ocular or lymphatic features. Forzano et al., (2004) reported a further convincing case. An MRI scan was not possible, but MR was severe. Additional features were the enlargement of liver and spleen, and a pulmonary stenosis. Another excellent example was reported by Valente et al., (2005). The pachygyria was diffuse, and the ventricles had large rounded horns, especially posteriorly. There was also a cavum septum pellucidum.
Hayes et al., (2009), reported a s0-called mild case (with pachygyria). As stated by the authors, ""whether all of these patients will be grouped together or split.......""
NB - Note the report by Eker et al., (2014) of a child with a ACTB mutation and features of Baraitser-Winter, but also of cerebro-fronto-facial III with which it overlaps. The Der Kaloustian et al., (2001) patients has now (Di Donato et al., (2014) been found to have a ACTB mutation. These latter authors argue that Fryns-Aftimos syndrome is but a severe form of Baraitser-Winter syndrome.
Two sibs and a single unrelated patient had a recognizable mental retardation syndrome, characterised by bilateral ptosis and colobomata of the iris. In addition, the eyes were widely spaced, and a broad epicanthus (especially inversus) increased the appearance of hypertelorism. The nasal bridge was flat. In all of the children, height was below the 3rd centile, whereas the head circumference was between the 10th and 25th. The Asian parents of the sibs were first cousins. One patient has subsequently been found to have pachygyria.
Pallotta (1991) reported a case with similar features and an inversion of chromosome 2 (p12q14). They noted that Ayme et al., (1979) reported a similar case with an identical chromosome rearrangement. The patient reported by Ramer et al., (1992) had many similarities. He also had pachygyria, a metopic ridge and a VSD.
Verloes (1993) reported a further possible case. In addition to the characteristic facies and a left iris coloboma, this male also had heterochromia of the iris. Seizures had occurred from 12 years but a CT scan was reported as normal.
Ramer et al., (1995) reported two new cases of the condition, and review previous cases. Fryns (1996) reported a possible case but there was no evidence of gyral malformations and intelligence was normal. This case had sensorineural deafness and chorioretinal colobomata.
Megarbane et al., (1997) reported 3 sibs with many features of the condition, but without iris colobomata. In addition, palpebral fissures slanted down quite significantly. MRI scan in one case showed ischaemic lesions in the occipital and temporal lobes and a thin corpus callosum.
Tsai et al., (2002) reported a family with dominant transmission of Teebi hypertelorism syndrome. However, one individual had an iris coloboma. Facially there are considerable similarities to Baraitser-Winter syndrome and this might cause confusion in an isolated case with mild developmental delay.
A further 2 cases were reported by Rossi et al., (2003) and the literature reviewed. The authors suggest that there is a specific pattern of brain malformation falling into the agyria-pachygyria-band spectrum.
A case including, heterotopia, was reported by Ganesh et al., (2005). Pachygyria, subcortical band heterotopia and periventricular nodular heterotopia were features in the Japanese patient reported by Shiihara et al., (2010). and frontal polymicrogyria occurred in the Egyptian case reported by Shawky et al., (2014). This latter case had iris, choroidal and optic nerve colobomata.
Riviere et al., (2012) studied a number of patients (18) and found 10 mutations in ACTB and 8 in ACTG1 in all. All were heterozygote de novo mutations. Note the report by Eker et al., (2014) of a child with an ACTB mutation and features of Baraitser-Winter, but also of cerebro-fronto-facial III with which it overlaps.
Di Donato et al., (2014) give good grounds for suggestiong that Fryns-Aftimos syndrome, is but the severe end of the spectrum of Baraitser-Winter syndrome. They add new features such as intestinal malrotation, a duplicated hallux and cleft lip and palate. LIFE IS STRANGE - in a suppliementary note (only available online) to the Riviere et al., (2012) paper it is stated that the sib -pair in the original paper (Baraitser and Winter, (1988) given the new findings of a heterozygous mutation probably did not have the Baraitser-Winter syndrome - there was no trigonocephaly and an MRI could not be performed. The single case in the same paper was followed up and a mutation has been found. On a personal note, Robin would have had a good laugh as I seem to think that he provided the single case and I the sibs - or was it the other way around!
Yates et al. (2016) reported on four new patients and provided an overview of the clinical characteristics of patients with this syndrome. Characteristic craniofacial features include trigonocephaly or metopic ridge, round face in infancy with progressive coarsening with age, hypertelorism, congenital ptosis, arched eyebrows, long and sometimes downslanting palpebral fissures and epicanthal folds. The nose is short with a broad nasal bridge, anteverted nares and depressed nasal tip. The patients have a long philtrum, thin vermillion border and macrostomia; cleft lip and palate are seen in some patients. The ears are often posteriorly rotated, small and dysplastic. Eye colobomas are present in about one -third of patients; microphthalmia is uncommon. Hearing loss is present in some cases, usually sensorineural, and can be progressive. Affected individuals have a mild to moderate short stature. Short webbed neck and pterygia may be present. Pectus deformities and wide set nipples are common. Many patients develop an unusual posture with anteverted shoulders, flexed elbows and knees; camptodactyly and clinodactyly may be present. The hallux may be broad or bifid. Cortical brain malformations are present in 60-70% of patients (frequently frontal or perisylvian pachygyria). The corpus callosum may be short, thick, hypoplastic or absent. Occasionally mild postnatal microcephaly may be present. Mild to moderate developmental delay is usually present in patients with no structural brain anomalies; pachygyria and other structural cerebral changes are associated with mild to profound intellectual disability. Epilepsy is usually associated with a structural brain anomaly. Congenital cardiac disease is present in one -third of patients. Genitourinary tract abnormalities include hydronephrosis, ectopic kidneys and undescended testes. Umbilical hernias are relatively common. Two previously reported patients have presented with haematological malignancies (acute lymphatic leukaemia and cutaneous lymphoma).
Climans et al. (2017) described a 27 year old female with Baraitser-Winter syndrome due to a heterozygous missense mutation in the ACTB gene. Clinical characteristics included developmental delay, seizures, behavioural issues (irritability, aggression, and defiance), and cochlear agenesis with hearing impairment. Seizures were generalized tonic and tonic-clonic or absence. Brain MRI showed diffuse pachygyria (predominantly frontal). The authors provided a detailed description of the seizure characteristics and electroencephalographic features of Baraitser-Winter syndrome.
Cuvertino et. al. (2017) described 33 patients with either deletions or loss of function mutations in the ACTB gene. Clinical characteristics included IUGR, feeding difficulties, hypotonia, postnatal growth retardation, microcephaly, and mild to severe intellectual disability. Dysmorphic features were wavy interrupted eyebrows, dense eyelashes, wide nose, wide mouth, prominent chin, overlapping toes, small nails, and sacral dimples.

* This information is courtesy of the L M D.
If you find a mistake or would like to contribute additional information, please email us at: [email protected]

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