Increased need for medical interventions in infants with velocardiofacial (deletion 22q11) syndrome

Ten of 12 patients diagnosed with deletion 22q11.2 in infancy required a total of 26 hospitalizations during their first year of life. After heart disease, feeding and respiratory problems were the most frequent reasons for intervention.

Diagnostic analysis of the Rubinstein-Taybi syndrome: five cosmids should be used for microdeletion detection and low number of protein truncating mutations

Rubinstein-Taybi syndrome (RTS) is a malformation syndrome characterised by facial abnormalities, broad thumbs, broad big toes, and mental retardation. In a subset of RTS patients, microdeletions, translocations, and inversions involving chromosome band 16p13.3 can be detected. We have previously shown that disruption of the human CREB binding protein (CREBBP or CBP) gene, either by these gross chromosomal rearrangements or by point mutations, leads to RTS. CBP is a large nuclear protein involved in transcription regulation, chromatin remodelling, and the integration of several different signal transduction pathways. Here we report diagnostic analysis of CBP in 194 RTS patients, divided into several subsets. In one case the mother is also suspect of having RTS. Analyses of the entire CBP gene by the protein truncation test showed 4/37 truncating mutations. Two point mutations, one 11 bp deletion, and one mutation affecting the splicing of the second exon were detected by subsequent sequencing. Screening the CBP gene for larger deletions, by using different cosmid probes in FISH, showed 14/171 microdeletions. Using five cosmid probes that contain the entire gene, we found 8/89 microdeletions of which 4/8 were 5' or interstitial. This last subset of microdeletions would not have been detected using the commonly used 3' probe RT1, showing the necessity of using all five probes.

Variation in microdeletions of the cyclic AMP-responsive element-binding protein gene at chromosome band 16p13.3 in the Rubinstein-Taybi syndrome

Most reported microdeletions of the CREB-binding protein (CBP) gene in the Rubinstein-Taybi syndrome (RTS) were detected by fluorescence in situ hybridization (FISH) with a single cosmid probe specific to the 3' region of the gene. In order to test the hypothesis that the rate of microdeletion-positive cases would be greater if the entire gene was evaluated, we performed FISH on 66 patients with an established diagnosis of RTS, using a panel of five cosmids that span the CBP gene. Five of 66 patients had deletions by FISH (9%), consistent with those rates reported in various series that ranged between 3-25%. Among our cases, different deletions were observed; one was deleted for the 5' but not the 3' region of the CBP gene (case 055). Other deletions included a total CBP deletion extending from the 5' through the 3' region (case 017), a deletion of all but the 5' region (cases 006 and 060), and an interstitial deletion in the 3' region (case 028). Fine breakpoint mapping with additional cosmid and yeast artificial chromosome (YAC) constructs was performed on these patients. The findings of a partial 5' deletion and of interstitial deletions of the CBP gene add to the known spectrum of mutations of this gene in RTS and demonstrate the need for evaluation of the entire CBP gene region for deletions rather than only the 3' region in RTS patients. These results further suggest that the true rate of microdeletion across the CBP gene detectable by FISH has yet to be established firmly. No phenotypic differences between partial deletion, complete deletion, and nondeletion patients were observed, supporting a haploinsufficiency model for RSTS.

Popliteal pterygium syndrome: a clinical study of three families and report of linkage to the Van der Woude syndrome locus on 1q32

Popliteal pterygium syndrome (PPS) is a rare autosomal dominant disorder, thought to occur with an incidence of approximately 1 in 300 000 live births. The main clinical manifestations are popliteal webbing, cleft lip, cleft palate, lower lip pits, syndactyly, and genital and nail anomalies. This report describes the clinical features in two families with PPS and one isolated case, showing the range of anomalies found both within and between the families. PPS has some features in common with Van der Woude syndrome (VWS), also inherited as an autosomal dominant condition, with cleft lip/palate and, more distinctively, lower lip pits. Although the gene for VWS has not yet been identified, it has been localised to within 1.6 cM in the region 1q32-41. To determine whether PPS and VWS represent allelic forms of the same gene, three families were genotyped for markers flanking and within the critical region. A multipoint lod score of 2.7 was obtained, with no evidence of recombination, supporting the hypothesis that these two disorders are allelic.

Social and emotional problems in children with neurofibromatosis type 1: evidence and proposed interventions

OBJECTIVE

To describe social and emotional problems in children and adolescents with neurofibromatosis type 1 (NF1) and propose interventions. Our hypothesis is that children with NF1 will have significantly more social and emotional problems, compared with their unaffected siblings and children in the general population.

STUDY DESIGN

Forty-three children with NF1 and 22 unaffected siblings (ages 5 to 18 years) were assessed with a standardized test completed by parents and teachers (the Child Behavior Checklist).

RESULTS

As with other aspects of NF1, there was variable expressivity. However, when rated by parents, children with NF1 had significantly more problems in comparison with test norms or unaffected siblings on 7 of 8 scales: Social Problems, Attention Problems, Anxiety/Depression, Withdrawal, Thought Problems, Somatic Complaints, and Aggressive Behavior. Children with NF1 also scored lower than unaffected siblings on measures assessing sports and other activities. Teachers reported fewer differences.

CONCLUSIONS

We propose interventions in the form of information for parents; early screening and treatment for speech, motor, and cognitive problems; and an increased level of intervention to prevent and treat psychologic problems, including systematic screening with standardized tests.

Progressive laryngotracheal stenosis with short stature and arthropathy

Laryngotracheal stenosis is rare in adults, especially in the absence of a malignancy. It is most commonly caused by fibrosis following endotracheal intubation or tracheal trauma. Other conditions causing progressive airway narrowing include the mucopolysaccharidoses and autoimmune disorders. With the exception of storage diseases, there are no well-defined genetic disorders with progressive airway narrowing as a common complication. We have evaluated three unrelated individuals with this potentially life-threatening finding, all of whom have a previously unrecognized condition. Each patient had short stature and joint stiffness with no evidence for infectious, inflammatory, or metabolic diseases as a cause of their condition. None of our patients had clinical findings indicative of known skeletal dysplasias or storage diseases. They had minor facial anomalies which included deeply set eyes, bushy eyebrows, and flat midface. Given the unique findings of our patients including adult onset critical tracheal stenosis, short stature, progressive joint limitation, and distinct facial anomalies, we conclude that they have a previously undescribed condition.

Partial trisomy 1q with growth hormone deficiency and normal intelligence

We present two sibs with partial trisomy 1 (q31.1-q32.1) due to a familial insertion. Patient 1 is a girl who presented at age 9 months with minor anomalies, short stature, and normal psychomotor development. Karyotype was 46,XX,der(4)ins(4;1) (p14;q31.1q32.1)pat. The father had a balanced inverted insertion of 1q into 4p, with karyotype 46,XY,ins(4;1)(p14;q31.1q32.1). At age 5 years, patient 1 was found to have short stature with documented growth hormone deficiency and ectopic pituitary. Her growth velocity responded well to treatment with growth hormone. Cognitive testing at 5 9/12 years showed normal intelligence with an IQ of 90. Patient 2, the brother of patient 1, presented with intrauterine growth retardation. He has the same chromosomal insertion as his sister, with partial trisomy 1q. We suggest that there is a recognizable phenotype of trisomy 1(q31.1-q32.1) which includes prenatal and postnatal growth retardation, narrow palpebral fissures, microphthalmia, microstomia, pituitary abnormalities, and normal intelligence in some individuals.

Thoracic tumors in children with neurofibromatosis-1

Thoracic tumors have been infrequently reported as a complication of neurofibromatosis-1 (NF1). To determine the prevalence and clinical features of thoracic tumors seen in children with NF1, we reviewed medical records and imaging studies for a group of 260 pediatric patients with NF1 followed in a multidisciplinary NF Center. Extrapleural thoracic tumors were seen in nine patients with NF1, corresponding to a prevalence of 3.5% in this hospital-based series of patients. Pathological studies of the tumors demonstrated plexiform neurofibroma in four cases and neurofibrosarcoma in one case. The remaining four cases were suspected to be plexiform neurofibroma based on clinical features but have not been confirmed histologically. Three patients presented with symptoms of chest pain, syncope, or wheezing; six patients were asymptomatic at the time of diagnosis of the tumors. Physical findings frequently found in patients with thoracic tumors were scoliosis (especially focal scoliosis) and visible plexiform neurofibromas of the neck. We conclude that NF1 patients presenting with any of these signs and symptoms should be screened for thoracic tumors with chest X-ray and magnetic resonance imaging as needed. It is unknown whether screening asymptomatic NF1 patients with chest X-rays on a regular basis will result in an improved outcome.

New insights into the phenotypes of 6q deletions

Deletions of chromosome 6q are rare. We report 3 new patients with 6q deletions. Case 1 is a male with an interstitial deletion [del(6)(q13q14.2)], hypotonia, speech delays, and minor anomalies. Case 2 is a male with an interstitial deletion [del(6)(q16.2q22.32)] and malformations, including truncus arteriosus and bilateral oligodactyly. Case 3 is a male with a terminal deletion [del(6)(q25.2)] with retinal pits, hydrocephalus, atrioventricular canal, and hydronephrosis. The findings in our patients and those from 57 previously reported cases demonstrated 3 phenotypic groups associated with 6q deletions. Group A [del(6)(q11-q16)] had a high incidence of hernias, upslanting palpebral fissures, and thin lips with lower frequency of microcephaly, micrognathia, and heart malformations. Group B [del(6)(q15-q25)] was associated with increased intrauterine growth retardation, abnormal respiration, hypertelorism, and upper limb malformations. Group C [del(6)(q25-qter)] was associated with retinal abnormalities, cleft palate, and genital hypoplasia. The only universal finding among all patients with 6q deletions was mental retardation. Other findings common to all 3 groups included ear anomalies (90%), hypotonia (82%), and postnatal growth retardation (68%).

Ullrich-Turner syndrome and neurofibromatosis-1

There is a well-known association between neurofibromatosis-1 (NF1) and Noonan syndrome-like manifestations, including short stature, short broad neck, and hypertelorism. These anomalies are thought to be due to variable expression of the NF1 gene. We report on two girls with NF1 who were found to have the Ullrich-Turner syndrome. Case 1, a 12-year-old white girl, was followed in a Neurofibromatosis Clinic because of multiple café-au-lait spots and a family history of NF1 in her mother and sister. On examination, she had short stature, hypertelorism, and short neck with low posterior hairline. Karyotype was 86% 46,XY/14% 45,X. Case 2, the first child of a woman with NF1, presented at birth with lymphedema of hands and feet and a short broad neck. Karyotype was 45,X. At age 23 months she was short, had epicanthic folds, hypertelorism, narrow palate, right simian crease, 19 café-au-lait spots, and axillary freckling. We conclude that chromosome studies should be performed in girls with NF1 who have short stature and Noonan- or Ullrich-Turner-like findings. Dilemmas raised by the dual diagnoses of NF1 and Ullrich-Turner syndrome include potential risks of growth hormone therapy and estrogen replacement therapy.

Loss of the N-myc oncogene in a patient with a small interstitial deletion of the short arm of chromosome 2

To our knowledge, only four previous cases of distal chromosome 2p deletions exist in the literature. We present a patient with minor facial anomalies who had a distal interstitial deletion of the short arm of chromosome 2, del(2)(p24.2p25.1). This patient had many features seen in other patients with distal 2p deletion including short stature, "rectangular" facies, microcephaly, hypotonia, and mental retardation. This patient also has sensorineural hearing loss which has been described in one other patient with a similar deletion. The N-myc oncogene has been mapped to 2p24. By fluorescence in situ hybridization using a cDNA probe for the N-myc oncogene, this patient was found to have a deletion of the N-myc oncogene. This confirms the previous map location for N-myc.

Prenatal diagnosis of ring chromosome 6 in a fetus with hydrocephalus

A patient with ring chromosome 6/monosomy 6 mosaicism is presented. At 25 weeks' gestation, ultrasound examination demonstrated fetal hydrocephalus. Amniocentesis was performed. The fetal karyotype was 45,XY,-6/ 45,XY,-6,+f/46,XY,r(6)(p25q27). Delivery of this male infant was by Caesarean section at 37 weeks' gestation. The karyotype in peripheral blood lymphocytes was 46,XY,r(6)(p25q27) with no indications of mosaicism. The infant had hydrocephalus which required treatment with a ventriculoperitoneal shunt at 22 days of age. He had no other obvious serious congenital anomalies. By 17 months he had developed microcephaly, seizures, severe bilateral hearing loss, and global development delay. This patient provides information regarding phenotypic variability of ring chromosome 6 and also reinforces the importance of offering amniocentesis if fetal hydrocephalus is detected as an isolated anomaly.

Neurodevelopmental profile of infants and toddlers with oculo-auriculo-vertebral spectrum and the correlation of prognosis with physical findings

We studied the neurodevelopmental profile of infants and toddlers with oculo-auriculo-vertebral spectrum (OAV) and determined if certain physical manifestations were indicative of a poor neurodevelopmental prognosis. Twenty-four patients with OAV, aged birth to 57 months, were seen in the Department of Medical Genetics at Children's National Medical Center for multidisciplinary evaluations, including neurodevelopmental assessments. Fifty-eight percent of these children scored more than 2 standard deviations below the mean in at least one domain of development. There was no difference in developmental outcome of boys versus girls, children affected unilaterally on the right side versus left side, and those with severe clinical manifestations versus those with a milder form. Children with OAV and abnormal muscle tone had lower cognitive, gross motor, and expressive language scores (P = 0.05, P = 0.002, and P = 0.02, respectively). Those affected bilaterally had lower cognitive, fine motor, receptive language, and expressive language scores (P = 0.06, P = 0.03, P = 0.03, P = 0.02, respectively). Children with cervical spine abnormalities had lower cognitive, fine motor, and expressive language scores (P = 0.02, P = 0.04, and P = 0.04, respectively). We conclude that infants and toddlers with OAV are at increased risk for neurodevelopmental delay, especially those with abnormal muscle tone, bilateral involvement, and cervical vertebral anomalies. The complexity of the neurodevelopmental problems is strongly suggestive of central nervous system disturbances. Patients with OAV need comprehensive evaluation by a multidisciplinary team to define potential neurodevelopmental delays, allow for early intervention services, and promote an optimal developmental outcome.

Neonatal intensive care as a locus for ethical decisions

Children born with congenital anomalies are usually cared for in the neonatal intensive care unit (NICU). Although most of these children will have conditions amenable to surgical correction, many will have serious underlying disorders that will alter the approach to management of the secondary birth defects and the child. The decision as to whether to treat or withhold treatment from a child with congenital anomalies lies with the parents or legal guardians with guidance and counseling from the health and medical care givers. The ability to make a rational decision about whether or not to offer treatment depends upon the ability to make a correct diagnosis, understand the implications of the diagnosis, and to be able to communicate this information to the patient's family. This responsibility, in many centers, falls upon the shoulders of the clinical geneticist. There is a critical need for clear communication among care givers who comprise the management team and between the management team and the family. Major obstacles that can arise include lack of communication among care givers and the reluctance of family members to make decisions regarding withholding treatment despite a diagnosis of a condition with a grave prognosis. As our technology improves, our ability to save the lives of the smallest and sickest infants will increase; the greatest dilemma, however, which we will face will not be whether we can treat, but rather, whether we should treat certain conditions and how these decisions will be made.

Patient with craniosynostosis and marfanoid phenotype (Shprintzen-Goldberg syndrome) and cloverleaf skull

Marfanoid phenotype with craniosynostosis (Shprintzen-Goldberg syndrome) is a rare disorder previously described in only 5 patients. We report on the sixth known patient with this condition. The findings which distinguish our patient from others reported previously are that she was ascertained prenatally as having a cloverleaf skull; this is the first female patient described with this condition. Postnatally, she presented with arachnodactyly, camptodactyly, and clover-leaf skull. Imaging studies of the brain documented microcephaly with malformed brain, hydrocephaly, and hypoplasia of the corpus callosum. She also had choanal atresia and stenosis, a clinical finding previously reported only once, in this disorder.

Ectrodactyly, diaphragmatic hernia, congenital heart defect, and agenesis of the corpus callosum

A unique case of a female born with four major malformations, ectrodactyly, diaphragmatic hernia, ventricular septal defect, and agenesis of the corpus callosum is reported. The patient had a normal birth weight, normal head circumference and a normal karyotype. There was no significant facial dysmorphism. The family history was unremarkable for birth defects, recurrent pregnancy loss, limb anomalies or consanguinity. We propose that this represents a new constellation of multiple malformations.

Airway obstruction in the Pierre Robin sequence

Airway obstruction and feeding difficulties vary among patients with Pierre Robin sequence (PRS). Treatment is challenging and the appropriate management may not be readily identified, leading to delay in securing the airway. A retrospective review of 90 children with PRS was done to identify subgroups at a higher risk of developing severe airway obstruction using oxygen and apnea monitoring, sleep studies, and response to treatment. Patients with isolated PRS (group I, 27 patients) and Stickler syndrome (group II, 32 patients) do not suffer from debilitating airway and feeding difficulties when compared to those with unique syndromes (group III, 16 patients) and recognized named syndromes (group IV, 15 patients). Feeding difficulties were universal with the severity proportional to airway obstruction. Aggressive intervention should be considered early in group III and IV patients.

Brachmann-de Lange syndrome with normal IQ

The Brachmann-de Lange syndrome is a disorder with a high degree of clinical variability, generally associated with moderate to severe mental retardation. To date, 7 previous cases of Brachmann-de Lange syndrome with normal intelligence (IQ > 70) have been described. We report the eighth case of Brachmann-de Lange syndrome with normal intelligence. In reviewing the literature, consistent clinical manifestations seen in these 8 patients that are of prognostic value are the absence of significant limb anomalies and birth weight > 2,500 g.

Velo-cardio-facial syndrome. Intrafamilial variability of the phenotype

We describe a mother and son with velo-cardio-facial syndrome (VCFS) in whom cytogenetic and DNA molecular studies demonstrate an interstitial deletion of the long arm of chromosome 22. Although these two individuals manifest the typical facial and cognitive features of VCFS, they are discordant for the cardiovascular and palatal anomalies, which are seminal manifestations of the disorder. Previously, this degree of phenotypic variability had not been well appreciated within a single family segregating the VCFS deletion. A review of other familial cases of VCFS suggests that the family described in this article is not atypical. Because a microdeletion would be expected to be inherited without alteration within individual families, the phenotypic variability observed in these families appears to be an intrinsic quality of the syndrome and not wholly due to genetic heterogeneity.

PHAVER syndrome: an autosomal recessive syndrome of limb pterygia, congenital heart anomalies, vertebral defects, ear anomalies, and radial defects

We have studied 2 sibs with vertebral, radial, congenital heart, and ear defects. The second patient also had limb pterygia and meningomyelocele. The abnormalities in these two sibs are seen in the VATER association; however, distinguishing these cases from the VATER association are the findings of pterygia, meningomyelocele, and probable autosomal recessive inheritance. We propose the acronym PHAVER syndrome for limb pterygia, heart defects, autosomal recessive inheritance, vertebral defects, ear anomalies and radial defects. This represents a new autosomal recessive disorder with phenotypic variability.

Deletions and microdeletions of 22q11.2 in velo-cardio-facial syndrome

Velo-cardio-facial syndrome (VCFS), an autosomal dominant disorder, is characterized by cleft palate, cardiac defects, learning disabilities and a typical facial appearance. Less frequently, VCFS patients have manifestations of the DiGeorge complex (DGC) including hypocalcemia, hypoplastic or absent lymphoid tissue and T-cell deficiency suggesting that these 2 conditions share a common pathogenesis. Here, we report the results of cytogenetic and molecular studies of 15 VCFS patients. High-resolution banding techniques detected an interstitial deletion of 22q11.21-q11.23 in 3 patients. The remaining 12 patients had apparently normal chromosomes. Molecular analysis with probes from the DiGeorge Chromosome Region (DGCR) within 22q11 detected DNA deletions in 14 of 15 patients. In 2 families, deletions were detected in the affected parent as well as the propositus suggesting that the autosomal dominant transmission of VCFS is due to segregation of a deletion. Deletions of the same loci previously shown to be deleted in patients with DGC explains the overlapping phenotype of VCFS and the DGC and supports the hypothesis that the cause of these two disorders is the same.

Cystic hygroma and congenital diaphragmatic hernia: early prenatal sonographic evaluation of Fryns' syndrome

We report a case of cystic hygroma and diffuse lymphangiectasia detected by sonogram at 12 weeks' gestation. Fetal karyotype was normal. At 20 weeks' gestation, herniation of the bowel into the chest was noted. At delivery, the infant was diagnosed as having Fryns' syndrome. This is the first reported case of Fryns' syndrome presenting with cystic hygroma.

Clinician activism and ethical restraints in providing treatment: preventive as opposed to reconstructive approaches

There is seldom controversy when faced with treatment decisions for a child born with a birth defect. Occasionally, the situation arises in which a decision to withhold treatment must be made. Under most circumstances the responsibility for making such decisions rests with the child's parents or guardians, since it is generally felt that these individuals are the best advocates for the child's best interests. In order to make such difficult decisions, the parents are dependent upon the guidance and counseling of health professionals, especially the physicians most closely involved in each case. The ultimate decisions made by parents are dependent upon open and unambiguous communication with their children's clinicians as well as open communications among the caregivers themselves. The role of the clinician as an advocate for treatment and nontreatment of children is dependent upon clear unbiased communication and the desire to do what is in the best interest for each patient.

New autosomal recessive syndrome of sparse hair, osteopenia, and mental retardation in Mennonite sisters

We report on 2 Mennonite sisters with a syndrome of sparse hair, osteopenia, mental retardation, minor facial abnormalities, joint laxity, and hypotonia. Their asymptomatic consanguineous parents (inbreeding coefficient F = 1/64) have 6 other offspring, 3 of whom died in infancy of type II osteogenesis imperfecta (OI), and 3 of whom are normal. We analyzed collagens synthesized by cultured fibroblasts from these 2 sisters and their parents and detected no major abnormalities. Results of chromosomal and metabolic evaluations including amino acid analysis of plasma, urine, and hair were unremarkable. A literature search and survey of a computerized syndrome identification database did not disclose an identical phenotype. The sisters bear superficial resemblance to several known syndromes which we excluded on clinical and/or biochemical grounds. We conclude that they represent a new autosomal recessive syndrome, distinct from type II OI and perhaps unique to the Mennonite population or to this particular family.

Dominant syndrome with isolated cryptophthalmos and ocular anomalies

We report on a mother and daughter with nonsyndromal cryptophthalmos. Both patients have additional ocular anomalies, including microphthalmia, retinal dysplasia, and Peters anomaly. The periocular and lid changes seen in these individuals are distinct from those seen in typical cryptophthalmos. The apparent dominant mode of inheritance in this family distinguishes this condition from autosomal recessive isolated cryptophthalmos and from the Fraser or cryptophthalmos syndrome.

Clinical variability of type 1 neurofibromatosis: is there a neurofibromatosis-Noonan syndrome?

Detailed clinical, ophthalmological, and molecular studies were performed on a multigeneration family in which there were many subjects with type 1 neurofibromatosis, a common autosomal dominant disorder. Affected family members displayed a wide range of clinical findings including, in two subjects, features seen in Noonan syndrome (triangular facies, downward slanting palpebral fissures, micrognathia, short stature, and learning disability). Subjects have been described previously whose features have overlapped with neurofibromatosis and Noonan syndrome, and it has been suggested that these persons might represent a separate condition. DNA haplotype analysis showed linkage of the neurofibromatosis phenotype seen in this family to the proximal long arm of chromosome 17 in the region where the type 1 neurofibromatosis gene has been mapped. These results imply that the Noonan phenotype seen in some patients with type 1 neurofibromatosis might be the result of variable or variant expression of the neurofibromatosis gene on chromosome 17. The possible role of non-specific factors, such as fetal hypotonia, in producing the neurofibromatosis-Noonan phenotype needs further investigation. The availability of closely linked and intragenic molecular markers for neurofibromatosis could potentially be useful in the diagnosis and characterisation of patients and families with atypical forms of neurofibromatosis.

A chromosome 17q de novo paracentric inversion in a patient with campomelic dysplasia; case report and etiologic hypothesis

The campomelic syndrome is a skeletal dysplasia with a characteristic pattern of deformity involving the proximal and distal extremities, pelvic and shoulder girdles, thoracic cage and palate. Respiratory compromise often leads to death in early infancy. Etiology has not been determined although evidence suggests genetic heterogeneity in patients with campomelia. Cytogenetic analysis in the past have revealed an unexpectedly high incidence of a 46, XY karyotype in phenotypic females. We report here on a patient with a typical case of campomelic dysplasia in whom a de novo paracentric inversion of chromosome 17q was identified. Review of the genetic map of the inverted region identified potential "structural" genes including the Hox-2-homeobox gene and the collagen gene, COLIA1, which may be involved in the pathogenesis of campomelic syndrome.

Fryns syndrome: an autosomal recessive disorder associated with craniofacial anomalies, diaphragmatic hernia, and distal digital hypoplasia

Fryns syndrome is an autosomal recessive, genetically determined condition with variable expression, which includes abnormal facial features, diaphragmatic hernia, distal limb abnormalities, and malformations of the cardiovascular, gastrointestinal, genitourinary, and central nervous systems. Five cases of children with Fryns syndrome, including an example of familial recurrence and a case of long-term survival, are described. This report brings to 25 the number of cases reported in the literature and further serves to illustrate the clinical variability of this disorder.

Molecular analysis of 46,XY females and regional assignment of a new Y-chromosome-specific probe

The relationship between Y-chromosome abnormalities and gonadal differentiation was investigated in six phenotypic females with a 46,XY karyotype and one patient with ambiguous genitalia secondary to apparently nonmosaic 46,XY mixed gonadal dysgenesis. No alterations were found in the Y chromosomes of six of these individuals by the use of either cytogenetic or molecular techniques. Cytogenetic analysis with high-resolution G-banding and Q-banding revealed a small deletion in the short arm of the Y chromosome in one female patient with some features of Turner syndrome. Southern hybridization with Y-specific probes showed a loss of DNA within deletion intervals 1, 2, and 3 of the Y chromosome. A new Y-chromosome-specific DNA probe that hybridizes to deletion interval 3 is described.

Autosomal recessive Robinow-like syndrome with anterior chamber cleavage anomalies

We describe 2 sisters with short stature, mesomelic brachymelia, macrocephaly, hypoplastic genitalia, and anterior chamber cleavage anomalies. Many of their manifestations have been described in individuals with Robinow syndrome; however, the anterior chamber cleavage anomalies seen in both girls, hydrocephalus seen in the younger sister, and apparent autosomal recessive inheritance do not characterize the Robinow syndrome. The syndrome present in these sisters most likely represents a previously undescribed autosomal recessive syndrome.

Diploid/tetraploid mosaicism in a liveborn infant demonstrable only in the bone marrow: case report and literature review

A case of a multiply malformed liveborn infant with mosaic tetraploidy on examination of bone marrow but not of peripheral lymphocytes or skin fibroblasts is presented. The literature is reviewed and the clinical features of our patient are compared with those of the nine previously reported cases. We suggest that when the clinical suspicion of polyploidy is strong, it may be prudent to expand the search for the abnormality to include cytogenetic studies of the bone marrow, despite a normal karyotype in peripheral blood.

Cytogenetic evaluation of fetal death: the role of amniocentesis

Fetal death can be associated with chromosomal abnormalities. Because of the degree of tissue maceration and autolysis seen in stillborn fetuses, it is often impossible to successfully culture these tissues for cytogenetic studies. We performed genetic amniocentesis in four cases of fetal death and were successful in obtaining cytogenetic results in all four, whereas the culture of fetal tissues for cytogenetics was successful in only one case. Chromosomal abnormalities were found in three of the four cases, including two fetuses with Down's syndrome and one fetus with Turner's syndrome. Because of the importance of cytogenetic studies in most cases of fetal death, we recommend amniocentesis at the time of diagnosis rather than waiting for delivery of fetal tissues, when postmortem changes may make it impossible to successfully culture fetal cells.

Screening for fetal Down's syndrome in pregnancy by measuring maternal serum alpha-fetoprotein levels

Although the risk of Down's syndrome increases with maternal age, women under 35 bear about 80 percent of the infants born with this condition. We prospectively investigated the utility of measuring maternal serum alpha-fetoprotein during the second trimester in women under 35 in order to identify pregnancies in which the fetus was affected with Down's syndrome. Over a two-year period, 34,354 women in this age group were screened. Amniocentesis was offered when the risk of Down's syndrome, calculated as a function of maternal age and maternal serum alpha-fetoprotein concentration adjusted for maternal weight and race, was 1:270 or higher, the risk for a 35-year-old woman. This threshold was exceeded in 1451 women in whom gestational age was confirmed by ultrasound; 9 women in this group had a fetus with the syndrome. In three women whose fetuses had trisomy 18 and one whose fetus had trisomy 13, the calculated risk of Down's syndrome was 1:270 or higher. Thus, among women in whom the risk exceeded our cutoff point, 1 in 161 were found to have a pregnancy in which the fetus was affected with Down's syndrome; the figure was 1 in 112 for all autosomal trisomies. Eighteen pregnancies involving Down's syndrome, three involving trisomy 18, and two involving trisomy 13 were not associated with a calculated risk above the cutoff point. The available data indicate that in our population, using a cutoff for risk at which 5 percent of women under 35 are offered amniocentesis, we will detect one quarter to one third of pregnancies in which the fetus has Down's syndrome.

Reevaluation of Russell-Silver syndrome

Russell-Silver syndrome was reevaluated 2.9 to 13.0 years after initial diagnosis in 15 patients. At follow-up, five of the 15 patients exhibited late catch-up growth and had normal height, six had developmental delays or mental retardation, and asymmetry was present in five. Given the great variability in the long-term prognosis for growth and development in patients with Russell-Silver syndrome, there is a need to reevaluate this syndrome and its clinical implications.

Yogurt. Contributory factor in development of nutritional rickets

Vitamin D deficient rickets occurred in a 15-month-old black girl for whom yogurt had been substituted for milk products. Investigation determined that commercially available yogurt contains no vitamin D, and that this fact is not generally recognized by lay persons and health professionals. Use of yogurt as a major source of nutritional intake in infants and young children may be a contributory factor in development of vitamin D deficiency rickets.