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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 2014 Dec 4;95(6):763–770. doi: 10.1016/j.ajhg.2014.11.004

Homozygous and Compound-Heterozygous Mutations in TGDS Cause Catel-Manzke Syndrome

Nadja Ehmke 1,2,18,, Almuth Caliebe 3,18, Rainer Koenig 4, Sarina G Kant 5, Zornitza Stark 6, Valérie Cormier-Daire 7, Dagmar Wieczorek 8, Gabriele Gillessen-Kaesbach 9, Kirstin Hoff 3,10,11, Amit Kawalia 12, Holger Thiele 12, Janine Altmüller 12,13, Björn Fischer-Zirnsak 1,14, Alexej Knaus 1,14, Na Zhu 1, Verena Heinrich 1, Celine Huber 7, Izabela Harabula 14, Malte Spielmann 1,14, Denise Horn 1, Uwe Kornak 1,2,14, Jochen Hecht 1,2,14, Peter M Krawitz 1,2,14, Peter Nürnberg 12,15,16, Reiner Siebert 3, Hermann Manzke 17, Stefan Mundlos 1,2,14,∗∗
PMCID: PMC4259972  PMID: 25480037

Abstract

Catel-Manzke syndrome is characterized by Pierre Robin sequence and a unique form of bilateral hyperphalangy causing a clinodactyly of the index finger. We describe the identification of homozygous and compound heterozygous mutations in TGDS in seven unrelated individuals with typical Catel-Manzke syndrome by exome sequencing. Six different TGDS mutations were detected: c.892A>G (p.Asn298Asp), c.270_271del (p.Lys91Asnfs22), c.298G>T (p.Ala100Ser), c.294T>G (p.Phe98Leu), c.269A>G (p.Glu90Gly), and c.700T>C (p.Tyr234His), all predicted to be disease causing. By using haplotype reconstruction we showed that the mutation c.298G>T is probably a founder mutation. Due to the spectrum of the amino acid changes, we suggest that loss of function in TGDS is the underlying mechanism of Catel-Manzke syndrome. TGDS (dTDP-D-glucose 4,6-dehydrogenase) is a conserved protein belonging to the SDR family and probably plays a role in nucleotide sugar metabolism.

Main Text

Catel-Manzke syndrome (MIM 302380) is characterized by Pierre Robin sequence (MIM 261800; HP:0000201)1 and a unique form of bilateral hyperphalangy causing clinodactyly of the index finger (HP:0009467). The condition was first described by Catel2 in 1961 and Manzke3 in 1966. Pierre Robin sequence is defined by micrognathia, obstruction of the airways due to a backward displacement of the tongue base, and, often but not always, cleft palate.4 The bilateral clinodactyly is caused by an accessory bone between the second metacarpal and its corresponding proximal phalanx, resulting in radial deviation of the index finger.5 This is sometimes referred to as Manzke dysostosis. Because not all reported cases have a cleft palate, Manzke suggested replacing the term palatodigital syndrome by the term micrognathia-digital syndrome.5

Previously, 26 individuals from 24 families with typical Catel-Manzke syndrome have been reported2,3,6–23 (reviewed by Manzke et al.5). Ten cases of an atypical form of Catel-Manzke syndrome have been described, including individuals with an extended phenotype20,24–28 and case subjects with unilateral hyperphalangism.15,29,30 Additionally, two cases of Manzke dysostosis without Pierre Robin sequence have been reported.17,31 In one family two affected girls and in a second family two affected boys were observed.12,14 The latter observations and parental consanguinity in another family20 indicate autosomal-recessive inheritance.

We identified homozygous and compound heterozygous mutations in TGDS in seven unrelated individuals with typical Catel-Manzke syndrome by using exome sequencing. Clinical data and mutations are summarized in Table 1.

Table 1.

TGDS Mutations and Clinical Presentation of the Seven Analyzed Individuals with Typical Catel-Manzke Syndrome

Individual 1 Individual 2 Individual 35 Individual 45 Individual 52,3,5 Individual 618 Individual 720
Sex male female female female male female female
Consanguinity none none none none none none none
Ethnicity Cameroon British/ South American German German German Dutch French
Age at last exam 18 months 3.5 years 16 months 19 years 52 years 17 years 28 years

Mutation

1st mutation c.892A>G (p.Asn298Asp) c.298G>T (p.Ala100Ser) c.298G>T (p.Ala100Ser) c.298G>T (p.Ala100Ser) c.298G>T (p.Ala100Ser) c.298G>T (p.Ala100Ser) c.298G>T (p.Ala100Ser)
2nd mutation c.270_271del (p.Lys91Asnfs22) c.294T>G (p.Phe98Leu) c.700T>C (p.Tyr234His) c.269A>G (p.Glu90Gly)
Type compound heterozygous compound heterozygous homozygous homozygous homozygous compound heterozygous compound heterozygous

Clinical Manifestations

Pierre Robin sequence + + + + + + +
Cleft palate +, V-shaped +, U-shaped +, U-shaped + +, U-shaped high arched palate, bifid uvula +, U-shaped
Manzke dysostosis + + + + + + +
Joint hypermobility nr nr nr nr nr + +
Congenital heart defect VSD, spontaneous closure VSD
Facial dysmorphism (additional to micrognathia) low-set ears, prominent anthelices hypertelorism, upslanted palpebral fissures, thin eyebrows narrow nostrils, thin arched eyebrows, full cheeks, hypertelorism mild hypertelorism, narrow nose nr thin eyebrows, mild proptosis, long columella, low-set ears, dysplastic helices, small mouth nr
Other skeletal anomalies short toes, short humeri, short femora nr nr clinodactyly V, genua valga clinodactyly V, pectus deformity clinodactyly V, bilateral M. Perthes brachymetacarpia,
scoliosis
Other features adducted thumbs, feet edema, short neck, wide fontanelle nr postnatal growth retardation obstruction of nasolacrimal duct nr bronchial hyperreactivity in early childhood postnatal growth retardation, hearing loss

Abbreviations are as follows: nr, not reported; VSD, ventricular septal defect.

Individual 1 is a male infant with healthy, unrelated parents from Cameroon with an unremarkable family history. He was delivered in the 39th week of pregnancy with a birth weight of 2,770 g (−1.5 SD), length of 45.5 cm (−2 SD), and head circumference of 33 cm (−1.6 SD). The diagnosis of Catel-Manzke syndrome was made at the age of 6 days. Intubation and ventilation were required due to a Pierre Robin sequence with severe retrognathia and cleft palate (Figures 1A and 1B). He had bilateral radial deviation and clinodactyly of the second digit and a mild ulnar deviation of the third and fourth finger. Radiographs showed the typical Manzke dysostosis (Figures 1C and 1D). Additionally, he had a wide anterior fontanelle, low set ears with prominent anthelices, a short neck, short humeri and femora, adducted thumbs, edema of the feet and eyelids, and short toes. Radiographs of humeri, femora, and pelvis were normal. When last examined at the age of 18 months, he still had retrognathia and a tracheostomy. However, he had developed well, was able to walk, and had started speaking. His height was 77 cm (−2.7 SD), his head circumference 48.5 cm (+0.2 SD), and his weight 10.2 kg (−0.3 SD).

Figure 1.

Figure 1

Clinical Features of Individuals 1 and 7

(A and B) Clinical photographs of individual 1 performed at the age of 6 days showing severe micrognathia, a short neck, and low set and dysplastic ears.

(C and D) Hand radiographs of individual 1 at the age of 6 days showing the Manzke dysostosis.

(E and F) Hand radiographs of individual 7 performed at the age of 28 years showing bilateral radial deviation and clinodactyly of the second digit. On the right hand a triangular-shaped bone is inserted between the second metacarpal and its proximal phalanx, and on the left hand the accessory bone and proximal phalanx fused.

Individual 2 is the second child of British and South American nonconsanguineous parents and has a healthy older sister. She was delivered at term after an uncomplicated pregnancy, with birth weight of 3,534 g (+0.3 SD) and head circumference of 35 cm (+0.25 SD). She was noted to have a cleft palate, micrognathia, bilateral hand abnormalities, mild hypertelorism, upslanting palpebral fissures, and thin eyebrows (Figures 2A–2D and 2F). Echocardiogram revealed a ventricular septal defect (VSD), and hand radiographs performed at the age of 3 months showed a triangular-shaped bone inserted between the second metacarpal and its proximal phalanx bilaterally causing radial deviation of the index fingers. On the left hand an additional pin-shaped ossification center was visible (Figures 2E and 2G). She underwent cleft palate repair and jaw distraction procedures. The VSD closed spontaneously, and her development progressed normally. When last seen at the age of 3.5 years, her height was 90 cm (−2.7 SD), head circumference was 49.3 cm (−0.4 SD), and weight was 13.36 kg (+0.2 SD).

Figure 2.

Figure 2

Clinical Features of Individual 2

(A–C) Clinical photographs of individual 2 performed at the age of 5 months showing micrognathia, upslanting palpebral fissures, short nose with anteverted nares, thin eyebrows, and cleft palate.

(D and F) Clinical photographs of both hands of individual 2 showing the clinodactyly of the index fingers, which is more pronounced on the left side.

(E and G) Hand radiographs of individual 2 performed at the age of 3 months showing a triangular-shaped bone inserted between the second metacarpal and its proximal phalanx bilaterally causing radial deviation of the index finger. On the left hand an additional pin-shaped ossification center is visible.

Individuals 3, 4, and 5 correspond to individuals 1, 2, and 3 reported by Manzke and coworkers in 2008 and are of German descent.5 Individual 5 is the individual first described by Catel and Manzke. No DNA samples of the parents of individual 3 were available. Individual 4 was last examined at the age of almost 20 years. She underwent bilateral osteotomy due to genua valga but is otherwise healthy. The mother of individual 4 was included in our study; the father, however, was unavailable for segregation analysis. Individual 5 has two unaffected children from a nonconsanguineous marriage who were included in our study. His unaffected parents were not available for analysis.

Individual 6 is the second child of healthy, unrelated Dutch parents and is now a 17-year-old adolescent who was already reported by Kant and coworkers in 1998.18 Growth and development were normal. She now has thin eyebrows, mild proptosis, low-set ears with dysplastic helices, a long columella, and a small mouth with high palate and slightly bifid uvula. She developed Perthes disease affecting the right hip at the age of 9 years and the left hip at the age of about 13 years. Her right leg is longer because of incomplete recovery of the left hip. She has subluxation of both knees, hypermobile elbow joints, and broad feet. Her older brother is unaffected.

Individual 7 is a woman who was reported as individual 3 by Nizon and coworkers in 2012 (Figures 1E and 1F).20 She has healthy, unrelated Northern French parents, who were not available for segregation analysis.

Individuals of family 1 (proband and parents), family 2 (proband and parents), family 4 (proband and mother), family 5 (proband and children), and the affected individual of family 7 were subjected to exome sequencing after approval of the ethical boards of the Charité, the Christian-Albrecht-University, and the University of Paris Decartes. The probands and/or parents gave their written consent for genetic testing and publication of images. High-throughput sequencing and data processing were performed in NGS-core facilities of the respective universities or collaborating service providers.

Eight exomes from individuals 2, 4, 5, and their relatives were captured with SeqCap EZ Human Exome Library version 2.0 kit (Roche NimbleGen). The finished libraries were sequenced on an Illumina HiSeq 2000 sequencing instrument (Illumina) with a paired-end 2 × 100 bp protocol. On average, this resulted in 6.7 Gb of mapped unique sequences with a mean coverage of 80×, i.e., 20× coverage for 91% of target sequences and 80× coverage for 85% of target sequences. The CCG VARBANK pipeline v.2.1 was used for data analysis and filtering with bwa-aln plus hg19 for mapping of reads in combination with the GATK toolkit for base quality score recalibration (BQSR), local realignment, and variant quality score recalibration (VQSR). GATK and samtools mpileup were used to call SNVs and short indels. Software developed in-house was used to annotate variants on a functional level (see Web Resources). Four DNA samples, including individual 1, his parents, and individual 7, were subjected to exome analysis with SureSelect All Exon Kit V2 (Agilent) for targeted enrichment followed by sequencing with Illumina’s HiSeq system (paired-end 2 × 100 bp). Sequence reads were mapped to the haploid human reference genome (hg19) using Novoalign (Novocraft Technologies). Single-nucleotide variants (SNVs) and short insertions and deletions (indels) were called with GATK toolkit according to the best practice guidelines and resulted in a high-quality exome variant set.32–34 The variant annotation on a functional level was performed with Jannovar and GeneTalk was used for filtering and further data analysis.35,36

Because a separate analysis of the families did not yield a single candidate gene, we combined all affected individuals into a case group and selected control subjects that matched the ethnicity and data quality of the cases for filtering. We assumed that the prevalence of the disorder is below 1 in 1,000,000 and has a high penetrance. We considered a recessive as well as a dominant mode of inheritance. Because none of the families had affected individuals in more than one generation, we filtered for potential de novo mutations when analyzing the dominant model of inheritance and could not identify a candidate gene. For the analysis of a recessive mode of inheritance, we first filtered the sequence variants in the samples based on genotype frequency data from large population genetics studies.37,38 We removed sequence variants that occurred in a homozygous state in more than one individual of the healthy controls. Alleles that had a heterozygous state in the affected individuals were removed if their allele frequency was above 0.01 in healthy controls.

The analysis of the autosomal-recessive model of inheritance yielded three candidate genes: MUC4 (MIM 158372), MUC6 (MIM 158374), and TGDS. Because mucin genes are known to be highly variable, we focused on TGDS as the most likely candidate gene. The following variants in TGDS (RefSeq accession number NM_014305.2) were identified: c.892A>G (p.Asn298Asp), c.270_271del (p.Lys91Asnfs22), c.298G>T (p.Ala100Ser), c.294T>G (p.Phe98Leu), and c.269A>G (p.Glu90Gly). We analyzed two additional individuals with Catel-Manzke syndrome by Sanger sequencing of all coding exons of TGDS and identified the homozygous variant c.298G>T in individual 3 and compound heterozygosity for the variants c.700T>C (p.Tyr234His); c.298G>T in individual 6. In total, six different variants (five missense and one nonsense) in TGDS were detected (Table 1). All candidate mutations were validated by ABI Sanger sequencing (sequencing primers are available upon request). Sanger sequencing demonstrated a biparental mode of inheritance of the compound heterozygous mutations in the parents except individual 7 whose parents were not available. We analyzed seven individuals with Catel-Manzke syndrome and all of them carried homozygous or compound heterozygous mutations in TGDS.

The function prediction algorithm MutationTaster39 classified all variants as disease causing. SIFT40 predicted only the amino acid change p.Phe98Leu and p.Tyr234His to be “tolerated,” and PolyPhen-241 predicted only the amino acid change p.Phe98Leu to be “benign.” All other alterations were also predicted to be “probably damaging” or “damaging.” The differences in prediction outputs are most likely due to different protein sequence alignments.42 The positions Ala100 and Tyr234 are completely conserved throughout evolution including E. coli (Figure 3B). The position Glu90 is conserved in zebrafish, the position Phe98 in C. elegans, and the position Asn298 in frog (not shown). Altogether we classify all substitutions to be disease causing. The amino acid change p.Lys91Asnfs22 is predicted to cause nonsense-mediated decay due to the truncation of the protein with the loss of 229 aa residues (out of a total of 350) at the C terminus.

Figure 3.

Figure 3

Segregation Analysis of the TGDS Variants and Predicted Effects on the Protein

(A) Pedigree structures and TGDS genotypes for the seven families.

(B) Schematic of human TGDS showing the predicted domains, the position of the amino acid changes, and the conservation. RefSeq accession numbers are as follows: human, NM_014305.2; mouse, NP_083854; zebrafish, AAH_66615; E. coli, WP_001710460; C. elegans, NP_508390. The predicted domains are based on the Conserved Domain Database. The triangles show conserved positions. The alignment was created with BoxShade and ClustalW. The colored background of the aa in the different species indicates the degree of conservation (black, conserved; gray, similarity in properties; white, not conserved, no similarity in properties).

(C) Predicted position of the amino acid changes in the structure of TGDS in Pyrococcus horikoshii. The structure of TGDS is shown as a model created with PyMol. The substrate binding domain is shown in blue, and the NAD binding domain is in light green. The positions aligning with the amino acid changes in TGDS in our cohort are framed in magenta. Ala100 and Phe98 are localized in the NAD-binding domain, and Asn298 is in the substrate binding domain. Glu90 and Tyr234 are localized in two of the loops.

Except for c.298G>T and c.270_271del, all identified variants were not previously reported in the databases. The missense mutation c.298G>T is a known variant, rs140430952, and was observed in a heterozygous state in 9 out of 4,300 healthy individuals of European descent that were analyzed in the National Heart, Lung, and Blood Institute (NHLBI) Exome Sequencing Project (ESP) and in 40 out of 61,377 individuals that were analyzed by the Exome Aggregation Consortium (ExAC). The variant c.270_271del was observed in a heterozygous state in 2 out of 2,132 individuals of African descent in the ESP data and in 4 out of 61,447 individuals in the ExAC data. However, both sequence variants, c.298T and c.270_271, did not occur in a homozygous state in healthy control subjects, supporting our hypothesis that these alleles are pathogenic.

If we assume a carrier rate of 0.002 for c.298T in the general European population, we would expect a homozygous individual in 1 out of 1,000,000, which is in good agreement with the estimated prevalence for Catel-Manzke syndrome. The relatively high frequency of c.298T in the European population might be due to a founder effect. We extracted sequence variants around c.298 from the available exome data for all affected individuals and estimated the haplotypes with the statistical software package PHASE v.2.1.43 Based on ten informative markers, we could reconstruct a 50 kb haplotype that is shared by all individuals with the pathogenic allele c.298T, supporting our hypothesis of a founder mutation (Tables S1–S3 available online).

TGDS (dTDP-D-glucose 4,6-dehydratase/growth-inhibiting protein 21) is an evolutionarily conserved 350 aa protein belonging to the short-chain dehydrogenase/reductase (SDR) family. It shares a sequence identity of 35% with its E. coli ortholog,44 which catalyzes the synthesis of dTDP-4-oxo-6-deoxy-D-glucose from dTDP-glucose as part of the rhamnose pathway. Because rhamnose, a common component of the cell wall and the capsule of many pathogenic bacteria, does not exist in humans,45 the specific function of TGDS and dTDP-4-oxo-6-deoxy-D-glucose in humans is unknown.

SDRs are structured as a one-domain Rossman fold that typically consists of a central beta sheet flanked by three alpha helices on each side. The beta sheet and the alpha helices show high conservation, although there are differences at the loops that are involved in substrate binding.46 According to the NCBI Conserved Domain Database, human TGDS is predicted to contain an active site, a NADP binding site, a substrate binding site, and a homodimer interface (Figure 3B). The amino acid changes p.Ala100Ser and p.Phe98Leu are located in the NAD binding domain, the amino acid change p.Asn298Asp is in the substrate binding site (Figures 3B and 3C), and we presume that the substitutions impair the functions of the respective domains. The amino acid changes p.Glu90Gly and Tyr234His, which are predicted to be located in two of the loops, possibly change the substrate binding potential of TGDS (Figure 3C). This could be explained by the loss of the negatively charged, hydrophilic properties of glutamine by substitution with the hydrophobic amino acid glycine and the loss of the aromatic, hydrophobic properties of tyrosine by substitution with the positively charged, hydrophilic amino acid histidine. Because of its proximity, Tyr243His could also affect the catalytic site.

More than 70 SDR genes exist in humans and have roles in steroid hormone, prostaglandin, and retinoid metabolisms, as well as extracellular matrix formation.47 The closest paralog of TGDS in the human genome is UXS1 (UGD; UDP-glucoronate decarboxylase 1), which shares an identity of 27% at the protein level (UXS1 isoform 1, RefSeq NP_ 001240804 [MIM 609749]). Mice homozygous for a null allele of UXS1 die prenatally.48 UXS1 encodes a 425 aa enzyme localized in the perinuclear Golgi compartment and catalyzes the synthesis of UDP-xylose of UDP-glucoronate, required in glycosaminoglycan (GAG) synthesis on proteoglycans. UXS1 does not have any dehydratase activity, emphasizing that UXS1 and TGDS are probably involved in different enzymatic processes.49

The features of Catel-Manzke syndrome demonstrate clinical overlap with Desbuquois dysplasia 1 (DBQD1 [MIM 251450]), caused by mutations in CANT150 (MIM 613165), Temtamy brachydactyly syndrome (TPBS [MIM 605282]), caused by mutations in CHSY151 (MIM 601883), and chondrodysplasia with joint dislocations, GPAPP type (GPAPP deficiency [MIM 614078]), caused by mutations in IMPAD152 (MIM 614010). Extra ossification centers distal to the second metacarpal50 and micrognathia have been described for several individuals with Desbuquois dysplasia 1. Hyperphalangism of digits 1–3 is a constant feature of Temtamy brachydactyly syndrome and some individuals have a cleft palate.53 IMPAD1 mutations were also identified in two individuals classified as Catel-Manzke-like with micrognathia and cleft palate, extra ossification centers, and additional features similar to GPAPP deficiency.20

Both CANT1 and CHSY1 are involved in proteoglycan synthesis.54,55 IMPAD1 is involved in proteoglycan sulfation.52 Based on the clinical overlap to these disorders and the homology to UXS1, it is plausible that TGDS could also be involved in either proteoglycan synthesis or sulfation. Additional features like congenital heart defects, joint hyperlaxity, pectus deformity, and scoliosis indicate that alterations in TGDS have a general effect on connective tissue, although milder than alterations in IMPAD1, CANT1, and CHSY1. Due to the spectrum of the amino acid substitutions, we suggest that loss of function in TGDS is the underlying mechanism of Catel-Manzke syndrome. Because none of the individuals carries two nonsense mutations, the missense mutations are probably hypofunctional alleles that do not cause complete loss of function.

In summary, we identified homozygous and compound heterozygous mutations in TGDS as disease causing in a cohort of individuals with Catel-Manzke syndrome. By using haplotype reconstruction, we showed that the mutation c.298G>T is probably a founder mutation. Because of the clinical overlap of Catel-Manzke syndrome with a spectrum of disorders caused by defects in proteoglycan synthesis or sulfation, we suppose that TGDS could also be involved in nucleotide sugar metabolism.

Acknowledgments

We would like to thank the families for their collaboration and contribution to this project, David Genevieve for his support, as well as Randi Kroll, Fabienne Pritsch, Gundula Leschik, Catrin Janetzki, Christian Becker, and Elisabeth Kirst for their technical assistance. We are indebted to Ammi Grahn and Emile Van Schaftingen for performing biochemical assays. U.K. received funding from the EU (EURO-CDG). Exome sequencing analysis for individual 7 has been supported by a GIS maladies rares funding A11144KS. The major part of exome data was analyzed on a high-performance computer cluster of the Regional Computing Centre of Cologne (RRZK), grant-aided by the Deutsche Forschungsgemeinschaft (DFG). P.N. is a founder, CEO, and shareholder of ATLAS Biolabs GmbH, which is a service provider for genomic analyses. P.M.K. is a founder, CEO, and shareholder of GeneTalk and received a grant from the DFG (KR3895/1-1). S.M. was supported by grants from the Deutsche Forschungsgemeinschaft and the Max Planck Foundation.

Contributor Information

Nadja Ehmke, Email: nadja.ehmke@charite.de.

Stefan Mundlos, Email: stefan.mundlos@charite.de.

Supplemental Data

Document S1. Tables S1–S3
mmc1.pdf (147.5KB, pdf)
Document S2. Article plus Supplemental Data
mmc2.pdf (1.1MB, pdf)

Web Resources

The URLs for data presented herein are as follows:

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Associated Data

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Supplementary Materials

Document S1. Tables S1–S3
mmc1.pdf (147.5KB, pdf)
Document S2. Article plus Supplemental Data
mmc2.pdf (1.1MB, pdf)

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