MILLER-DIEKER LISSENCEPHALY SYNDROME; MDLS
Alternative titles; symbolsMDSMILLER-DIEKER SYNDROME CHROMOSOME REGION, INCLUDED; MDCR, INCLUDEDGene map locus 17p13.3
A number sign (#) is used with this entry because the Miller-Dieker lissencephaly syndrome appears to be caused by deletion of several genes on 17p. Deletion of or mutation in the LIS1 gene (601545) appears to cause the lissencephaly because point mutations have been identified in the disorder isolated lissencephaly sequence (ILS; see 607432). On the other hand, facial dysmorphism and other anomalies in Miller-Dieker patients appear to be the consequence of deletion of additional genes distal to LIS1. Toyo-oka et al. (2003) presented evidence that the gene whose deletion is responsible for the greater severity of Miller-Dieker syndrome compared to isolated lissencephaly is the gene encoding 14-3-3-epsilon (YWHAE; 605066).
(The number 247200 was assigned to this entry when it was first created between the fourth (1975) and eighth (1978) editions of Mendelian Inheritance in Man, on the presumption that the disorder was autosomal recessive. It turns out that both isolated lissencephaly sequence and the Miller-Dieker syndrome are due to haploinsufficiency of one or more genes on 17p; they are autosomal dominant disorders.)
Miller-Dieker lissencephaly syndrome is a chromosomal microdeletion disorder characterized by microcephaly and a thickened cortex with 4 rather than 6 layers. Lissencephaly means 'smooth brain,' i.e., brain without convolutions or gyri.
Miller (1963) described this condition in a brother and sister who were the fifth and sixth children of unrelated parents. The features were microcephaly, small mandible, bizarre facies, failure to thrive, retarded motor development, dysphagia, decorticate and decerebrate postures, and death at 3 and 4 months, respectively. Autopsy showed anomalies of the brain, kidney, heart, and gastrointestinal tract. The brains were smooth with large ventricles and a histologic architecture more like normal fetal brain of 3 to 4 months' gestation.
Dieker et al. (1969) described 2 affected brothers and an affected female maternal first cousin. They also emphasized that this should be termed the lissencephaly syndrome because malformations of the heart, kidneys, and other organs, as well as polydactyly and unusual facial appearance, are associated.
Reznik and Alberca-Serrano (1964) described 2 brothers with congenital hypertelorism, mental defect, intractable epilepsy, progressive spastic paraplegia, and death at ages 19 and 9 years. The mother showed hypertelorism and short-lived epileptiform attacks. Autopsy showed lissencephaly with massive neuronal heterotopia, and large ventricular cavities of embryonic type. (The findings in the mother made X-linked recessive inheritance a possibility.) The patients of Reznik and Alberca-Serrano (1964) may have suffered from a disorder distinct from that described by Miller (1963) and Dieker et al. (1969). All patients with the Miller-Dieker syndrome are severely retarded. None learned to speak. They may walk by 3 to 5 years but spastic diplegia with spastic gait is evident. As in other forms of stationary forebrain developmental anomalies, decerebrate posturing with head retraction emerges in the first year of life. In the case of Norman et al. (1976), 3 sibs were affected and the parents were third cousins.
Dobyns et al. (1983) stated that the most characteristic finding on computerized tomography is complete failure of opercularization of the frontal and temporal lobes, and that this most likely accounts for bitemporal hollowing. (Opercularization is formation of the parts of the lobes that cover part of the insula.) The form of lissencephaly in the Miller-Dieker syndrome was designated classical or type I lissencephaly by Dobyns et al. (1984). It is characterized by microcephaly and a thickened cortex with 4 rather than 6 layers. (Type II lissencephaly has associated obstructive hydrocephalus and severe brain malformations. It is a major manifestation of the HARD plus/minus-E syndrome (236670). The Walker-Warburg syndrome (236670) is the most frequent form of type II lissencephaly (Dobyns et al., 1988). A third form occurs in the Neu-Laxova syndrome (256520). Dobyns et al. (1984) suggested the designation Norman-Roberts syndrome (see 257320) for the disorder associated with type I lissencephaly but distinct from the Miller-Dieker syndrome. A low, sloped forehead and prominent nasal bridge are distinctive to this condition and chromosomes are normal.)
Bordarier et al. (1986) pointed out that agyria was considered a rare malformation until the recent progress in neuroradiology.
Selypes and Laszlo (1988) described the Miller-Dieker syndrome in a 12-year-old boy with a de novo terminal deletion of 17p13. He had growth retardation, microcephaly, ptosis of the left eyelid, low-set ears, prominent philtrum, thin upper lip, clinodactyly of the fifth fingers, and atrial septal defect. Lissencephaly was demonstrated by computerized tomography. MDS is a severe neuronal migration abnormality.
Dobyns et al. (1988) found the most consistent features of the facies in MDLS to be bitemporal hollowing, prominent forehead, short nose with upturned nares, prominent upper lip, thin vermilion border of the upper lip, and small jaw. Agenesis of the corpus callosum was demonstrated by computerized tomography in about 90% of cases. The cerebellum was normal in all. Striking midline calcifications were found in most patients with visible chromosomal change.
Allanson et al. (1998) reported pattern profiles on 5 children with MDLS and 25 children and adolescents with isolated lissencephaly sequence. The patients with ILS at all ages showed reduced head circumference and a wide and flat face with a broad nose and widely spaced eyes. In the age group of 6 months to 4 years of age, there was similarity between the pattern profiles of ILS and MDLS, with a correlation coefficient of 0.812 (p less than 0.001). In MDLS there are a few distinguishing features, including brachycephaly, a slightly wider face, and a considerably shorter nose. Allanson et al. (1998) concluded that given the striking similarity of the pattern profiles, the principal diagnostic discriminators are qualitative features, specifically the tall, furrowed forehead and the long, broad thickened upper lip in MDLS. They also concluded that their observations were consistent with the concept of additional gene(s) telomeric to LIS1 contributing to the facial phenotype of MDLS.
Dobyns et al. (1983) found a ring chromosome 17 in 1 patient and were prompted to study 2 other cases. They found partial monosomy of 17p13 in one of these. A review of the literature uncovered abnormality of 17p in 5 other patients in 3 families. Sharief et al. (1991) reported a case of MDS associated with ring chromosome 17.
Ledbetter (1983) studied the parents of the patients reported by Miller (1963), Dieker et al. (1969), and Norman et al. (1976). The father of Miller's sibs had a 15q;17p translocation; the father of Dieker's patients 1 and 3 had a 12q;17p translocation and both parents of Norman's patient had normal karyotypes. An autosomal recessive form of lissencephaly is suggested also by the parental consanguinity in Norman's case.
Stratton et al. (1984) further narrowed the monosomy to 17p13.3. They also reported prenatal diagnosis. In a patient with MDS and no cytogenetically detectable deletion, vanTuinen and Ledbetter (1987) found evidence of deletion by use of a DNA marker located at 17p13.3. Greenberg et al. (1986) described a family in which the mother had a pericentric inversion of chromosome 17 and 2 of her children had MDS. One of them was shown to carry a recombinant 17 consisting of dup(17q) and del(17p). The patient described by Selypes and Laszlo (1988) had a de novo terminal deletion of 17p13.
Bordarier et al. (1986) reported anatomoclinical observations on a case of partial deletion of 17p. Golgi stains showed many inverted pyramidal cells in the superficial part of the cortex.
Dhellemmes et al. (1988) found a microdeletion of 17p in 1 of 12 cases with lissencephaly. They subscribed to the 4-way classification of lissencephalies proposed by Dobyns et al. (1984): the Miller-Dieker syndrome with abnormality of chromosome 17; the Miller-Dieker syndrome without evident abnormality of chromosome 17; a disorder with manifestations unlike those of the Miller-Dieker syndrome but with familial occurrence and normal chromosomes (Norman-Roberts syndrome); and a form without characteristic facial dysmorphism and without familial occurrence. In the study of Dhellemmes et al. (1988), 1 patient was in category 1 and the other 11 were in category 4.
Dobyns et al. (1991) reviewed the results of their clinical, cytogenetic, and molecular studies in 27 patients with MDS from 25 families. All had severe type I lissencephaly with grossly normal cerebellum and a distinctive facial appearance consisting of prominent forehead, bitemporal hollowing, short nose with upturned nares, protuberant upper lip, thin vermilion border, and small jaw. Chromosome analysis showed deletion of band 17p13 in 14 of 25 MDS probands. Studies using probes from the 17p13.3 region detected deletions in 19 of 25 probands tested, including 7 in whom chromosome analysis was normal. When the cytogenetic and molecular data were combined, deletions were detected in 21 of 25 probands. Of the 11 patients in whom parental origin of the de novo deletion was determined, paternal origin was demonstrated in 7 and maternal origin in 4.
De Rijk-van Andel et al. (1991) identified a submicroscopic deletion of 2 DNA markers located at 17p13 in a patient with isolated grade 3 lissencepha
ly. The findings suggested that MDS and isolated lissencephaly have a common etiology.
About 90% of MDS patients have visible or submicroscopic deletions of 17p13.3; Ledbetter et al. (1992) investigated the possibility that some patients with 'isolated lissencephaly sequence' (ILS) had smaller deletions in that chromosomal region. Their studies uncovered 6 submicroscopic deletions in 45 ILS patients with gyral abnormalities ranging from complete agyria to mixed agyria/pachygyria and complete pachygyria. In situ hybridization proved to be the most rapid and sensitive method of deletion detection. The centromeric boundary of these deletions overlapped that of MDS patients, while the telomeric boundary for 4 of them was proximal to that of MDS.
Oostra et al. (1991) studied 5 patients with MDS, 17 patients with isolated lissencephaly sequence, 1 patient with an unclassified form of lissencephaly, and 9 patients with an atypical cortical dysplasia. All patients had normal chromosomes except for a deletion of 17p13.3 in 1 of the 5 MDS patients. The 5 MDS patients showed deletion of markers YNZ22.1 and YNH37.3. Dobyns et al. (1993) reviewed the clinical phenotype, pathologic changes, and results of cytogenetic and molecular genetic studies in 90 probands with lissencephaly, with emphasis on patients with the classic form (type I).
A cryptic translocation in one of the parents of MDS patients had been found using fluorescence in situ hybridization (FISH) (Kuwano et al., 1991). Masuno et al. (1995) described a patient with MDS and a maternal cryptic translocation. Kingston et al. (1996) described a boy who, in addition to lissencephaly and facial features of MDS, had rhizomelic shortening of the limbs, cleft palate, hypospadias, and sacral tail. Banded chromosome analysis did not reveal any abnormality of chromosome 17. FISH studies with the alpha satellite probe D17Z1 and 3 overlapping cosmids from the MDS critical region showed that his mother and grandmother carried a balanced inv(17)(p13.3q25.1). The proband's karyotype was 46,XY,rec(17),dup q,inv(17)(p13.3q25.1)mat. Additional manifestations in the proband were due to distal 17q trisomy. Masuno et al. (1995) and Kingston et al. (1996) stated that FISH analysis is crucial to exclude subtle rearrangements in affected children and their parents.
VanTuinen et al. (1988) found that the genes for myosin heavy chain-2 (160740), tumor antigen p53, and RNA polymerase II (180660), previously mapped to 17p, are not included in the MDS deletion region and therefore are unlikely to play a role in its pathogenesis.
Ledbetter et al. (1988) described 2 variable number tandem repeat (VNTR) probes that revealed a 15-kb region containing HTF islands that are likely to be markers of expressed sequences. Use of these probes showed homology to chromosome 11 in the mouse. Because of the close location of MDCR to tumor antigen p53 (TP53; 191170) and MYHSA1 (160730) in man, the homologous locus in the mouse is probably close to the corresponding loci in that species. Several neurologic mutants in the mouse map to that region.
In 2 MDS patients with normal chromosomes, a combination of somatic cell hybrid, RFLP, and densitometric studies demonstrated deletion of polymorphic anonymous probes in the paternally derived chromosome 17 (VanTuinen et al., 1988). This demonstration of submicroscopic deletion suggests that all MDS patients may have deletions at the molecular level. In an addendum, the authors stated that 3 additional MDS patients without cytogenetically detectable deletions had been found to have molecular deletions and that 'to date' 13 of 13 MDS patients had molecular deletions. Using anonymous probes, Schwartz et al. (1988) likewise found molecular deletions in 3 MDS patients, 2 of whom had no visible abnormalities of chromosome 17. None of the 3 RFLP loci studied was absent in a case of lissencephaly without MDS.
Ledbetter et al. (1989) found that in all of 7 patients 3 overlapping cosmids spanning more than 100 kb were completely deleted, thus providing a minimum estimate of the size of the MDS critical region. A hypomethylated island and evolutionarily conserved sequences were identified within this 100-kb region--indications of the presence of one or more expressed sequences potentially involved in the pathophysiology of this disorder.
Reiner et al. (1993) cloned a gene called LIS1 (lissencephaly-1) in 17p13.3 that is deleted in Miller-Dieker patients. Nonoverlapping deletions involving either the 5-prime or the 3-prime end of the gene were found in 2 patients, identifying LIS1 as the disease gene. The deduced amino acid sequence showed significant homology to beta subunits of heterotrimeric G proteins, suggesting that it may be involved in a signal transduction pathway crucial for cerebral development. Since haploinsufficiency appears to lead to the syndrome, half the normal dosage of the gene product is apparently inadequate for normal development. It may be that improper proportions of beta and gamma subunits of a G protein disturb formation of the normal protein complex, as in hemoglobin H disease, which is caused by an imbalance in the ratio of alpha- to beta-globin. About 15% of patients with isolated lissencephaly and more than 90% of patients with Miller-Dieker syndrome have microdeletions in a critical 350-kb region of 17p13.3. Genotype/phenotype studies are necessary to explain the phenotypic differences. Neer et al. (1993) commented on the nature of the newly found gene and the usefulness of identifying families of genes and the proteins they encode.
Platelet-activating factor (PAF) is involved in a variety of biologic and pathologic processes (Hanahan, 1986). PAF acetylhydrolase, which inactivates PAF by removing the acetyl group at the sn-2 position, is widely distributed in plasma and tissue cytosols. One isoform of PAF acetylhydrolase present in bovine brain cortex is a heterotrimer comprising subunits with relative molecular masses of 45, 30, and 29 kD (Hattori et al., 1993). Hattori et al. (1994) isolated the cDNA for the 45-kD subunit. Sequence analysis revealed 99% identity with the LIS1 gene, indicating that the LIS1 gene product is a human homolog of the 45-kD subunit of intracellular PAF acetylhydrolase. The results raised the possibility that PAF and PAF acetylhydrolase are important in the formation of the brain cortex during differentiation and development.
Kohler et al. (1995) searched for microdeletions in 17p13.3 in 5 patients with lissencephaly-1, typical features of Miller-Dieker syndrome and apparently normal karyotypes. Analysis of loci D17S5 and D17S379 by PCR and FISH revealed a deletion in 3 of the 5 cases. No deletion was observed in the other 2. Given the almost identical clinical picture of the 5 patients, the great variation in the molecular findings argued against Miller-Dieker syndrome being a contiguous gene syndrome.
Chong et al. (1996) characterized the LIS1 gene (601545), demonstrating the presence of 11 exons. SSCP analysis of individual exons was performed on 18 patients with isolated lissencephaly sequence (ILS; see 607432) who showed no deletions detectable by FISH. In 3 of these patients, point mutations were identified: a missense mutation, a nonsense mutation, and a 22-bp deletion at the exon 9-intron 9 junction predicted to result in a splicing error. The findings confirmed the view that mutations of LIS1 are the cause of the lissencephaly phenotype in ILS and in the Miller-Dieker syndrome. Together with the results of deletion analysis for other ILS and Miller-Dieker syndrome patients, these data are also consistent with the previous suggestion that additional genes distal to LIS1 are responsible for the facial dysmorphism and other anomalies in MDS patients.
Cardoso et al. (2003) completed a physical and transcriptional map of the chromosome 17p13.3 region from LIS1 to the telomere. Using FISH, Cardoso et al. (2003) mapped the deletion size in 19 children with ILS (607432), 11 children with MDS, and 4 children with 17p13.3 deletions not involving LIS1. Cardoso et al. (2003) showed that the critical region that differentiates ILS from MDS at the molecular level can be reduced to 400 kb. Using somatic cell hybrids from selected patients, Cardoso et al. (2003) identified 8 genes that are consistently deleted in patients classified as having MDS. These genes include ABR (600365), 14-3-3-epsilon (605066), CRK (164762), MYO1C (606538), SKIP (603055), PITPNA (600174), SCARF1, RILP, PRP8 (607300), and SERPINF1 (172860). In addition, deletion of the genes CRK and 14-3-3-epsilon delineates patients with the most severe lissencephaly grade. On the basis of recent functional data and the creation of a mouse model suggesting a role for 14-3-3-epsilon in cortical development, Cardoso et al. (2003) suggested that deletion of 1 or both of these genes in combination with deletion of LIS1 may contribute to the more severe form of lissencephaly seen only in patients with Miller-Dieker syndrome.
For rapid diagnosis, Batanian et al. (1990) used PCR in connection with probe YNZ22 (D17S5), a highly polymorphic, variable number tandem repeat (VNTR) marker previously shown to be deleted in all patients with MDS, but not in patients with isolated lissencephaly sequence. Analysis of 118 normal persons revealed 12 alleles (differing in copy number of a 70-bp repeat unit) ranging in size from 168 to 938 bp.
Pollin et al. (1999) evaluated the risk of abnormal pregnancy outcome in carriers of balanced reciprocal translocations involving the MDS critical region in 17p13.3. Fourteen families were ascertained on the basis of an affected index case. In these 14 families, 38 balanced translocation carriers had 127 pregnancies, corrected for ascertainment bias by the exclusion of all index cases and carriers in the line of descent to the index cases. An abnormal phenotype, an unbalanced chromosome constitution, or both, were found in 33 of the 127 (26%) pregnancies: 15 of 127 (12%) had MDS and an unbalanced karyotype with del(17p); 9 of 127 (7%) had a less severe phenotype with dup(17p); and 9 were unstudied, although MDS with der(17) was usually suspected based on early death and multiple congenital anomalies. When unexplained pregnancy losses, including miscarriages and stillbirths, were excluded from the total, 33 of 99 (33%) pregnancies were phenotypically or genotypically abnormal. The overall risk of abnormal pregnancy outcome of 26% was in the upper range of the reported risk for unbalanced offspring of carrier parents ascertained through liveborn aneuploid offspring. The risk increased to 33% when unexplained pregnancy losses were excluded from the total.
The condition of so-called inverted pyramids is observed in the 'reeler' mutation in mice (Landrieu and Goffinet, 1981). The 'reeler' mutation (re) is located on mouse chromosome 5, a chromosome that carries no gene known thus far to be homologous to a gene on human chromosome 17. Thus, there is no support from homology of synteny for the notion that agyria in man is the same as 'reeler' in the mouse.
The conserved sequences identified by Ledbetter et al. (1989) were mapped to mouse chromosome 11 by using mouse-rat somatic cell hybrids, thus extending the remarkable homology between human chromosome 17 and mouse chromosome 11 by 30 cM, into the 17p telomere region.
Yingling et al. (2003) discussed the prospects of using the mouse to model Miller-Dieker syndrome. Null and conditional knockout alleles in the mouse had been generated for Lis1 and Mnt (603039), and null alleles had been produced for Hic1 (603825) and 14-3-3-epsilon. For Lis1 and Pitpn (600174), hypomorphic alleles also existed.
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Victor A. McKusick - updated : 10/13/2003Victor A. McKusick - updated : 6/9/2003Ada Hamosh - updated : 5/9/2003Victor A. McKusick - updated : 8/31/1999Michael J. Wright - updated : 2/12/1999Iosif W. Lurie - updated : 8/6/1996
Victor A. McKusick : 6/3/1986
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