genetics and genomics of craniosynostosis syndromes
TRANSCRIPT
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Maximilian Muenke, M.D. Chief, Medical Genetics Branch
Director, NIH Medical Genetics and Genomic Medicine Residency and Fellowship Program
National Human Genome Research Institute National Institutes of Health, Bethesda, Maryland
Genetics and Genomics of Craniosynostosis Syndromes
Suburban Hospital and Johns Hopkins University School of Medicine, March 7, 2014
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Holoprosencephaly
ADHD
Craniosynostosis Syndromes
Fatty Liver Congenital
Cardiac Anomalies
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Craniosynostosis
• Premature fusion of one or several sutures of the skull
• Prevalence: 1 in 2,100 to 1 in 3,000 at birth
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Figure Legend: FB: frontal bone; IFS: interfrontal suture, PB: parietal bone, SS: Sagittal suture, LS: lambdoid suture, SOB: supraorbital bone Benson and Opperman, in: Muenke M, Kress W, Collmann H, Solomon B (eds): Craniosynostoses: Molecular Genetics, Principles of Diagnosis and Treatment. Monogr Hum Genet. Basel, Karger, 2011, vol 19, pp 1–7
Anatomy of Cranial Bones and Bone Growth in Calvaria
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Unicoronal Synostosis Goldenhar Syndrome Lambdoid Synostosis
Abnormal Head Shapes
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Positional Deformity vs. Unilateral Lambdoid Synostosis
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Severe Proptosis in Patient with Pfeiffer Syndrome
OR: lateral orbital rim; C: cornea
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Isolated Nonsyndromic
Craniosynostosis
Sagittal synostosis: 50-60%
Coronal synostosis: 20-30%
Metopic and lambdoidal synostosis less common
Etiology: mostly sporadic, but familial instances are known
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*
Isolated Scaphocephaly
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Isolated Trigonencephaly
a b c d
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Left-sided Unicoronal Synostosis
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Isolated Brachycephaly
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Unilateral Lambdoid Synostosis
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Syndromic Craniosynostosis
Craniosynostosis with associated anomalies
(mostly limb defects)
Over 100 syndromes with craniosynostosis
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Sporadic Pfeiffer Syndrome
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Muenke Syndrome
• Defined by FGFR3 mutation: p.Pro250Arg
• Most common craniosynostosis syndrome
• Muenke syndrome comprises 25% of molecularly defined craniosynostosis
• An estimated 8% of craniosynostosis patients have Muenke syndrome
• Incidence: 1 in 30,000
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Syndromic Craniosynostosis
Apert Syndrome FRFR2
Pfeiffer Syndrome FGFR1 & FGFR2
Crouzon Syndrome FGFR2
Muenke Syndrome FGFR3
Saethre-Chotzen Syndrome TWIST1
Craniofrontonasal Syndrome EFNB1
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Apert Syndrome
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Muenke M, Kress W, Collmann H, Solomon B (eds): Craniosynostoses: Molecular Genetics, Principles of Diagnosis and Treatment. Monogr Hum Genet. Basel, Karger, 2011, vol 19, pp 1–7
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Pfeiffer Syndrome
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Crouzon Syndrome
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FGFR2 Mutations in Crouzon Syndrome
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Saethre-Chotzen Syndrome
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TWIST1 Mutations in Saethre-Chotzen
Syndrome
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Hand and Foot Findings in Patients with Craniosynostosis Syndromes
Pfeiffer Syndrome Saethre-Chotzen Syndrome Muenke Syndrome
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Craniofrontonasal Syndrome
(CFNS)
Craniofacial findings:
• Coronal synostosis (brachycephaly/plagiocephaly
• Facial asymmetry (with unicoronal synostosis)
• Hypertelorism with down-slanting palpebral
fissures & broad nasal root
• Grooved nasal tip
• Cleft lip+/- palate (occasionally)
Other findings:
• Various skeletal anomalies
Inheritance: X-Linked
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Feldman et al
(1997)
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Paternal
grandmother
of proband
Father of
proband Proband
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EFNB1 Mutations in Craniofrontonasal
Syndrome
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Johnson and Wilkie, 2011
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Optional
metopic Cs/
Trigonocephaly
Sagittal Cs/
Scaphocephaly
Unclassified coronal Cs/
Brachycephaly, anterior plagiocephaly
Clinical Genetics
FGFR1 exon 7(IIIa)
TWIST exon 1
Craniofacial MLPA
Array CGH +/-
karyotyping
Apert
FGFR2
exon 8(IIIa):
p.Ser252Trp
p.Pro253Arg
Cloverleaf skull
Pansynostosis
yes no
CFNS
EFNB1
incl. MLPA
FGFR3 exon 7(IIIa)+10, FGFR2 exon 8+10(IIIa+c)
FGFR2 exon 3, 5, 11, 14-17
Isolated, Muenke, Crouzon,
SCS, mild Pfeiffer, JWS
Positive family history
+/- extracranial malformations
+/- profound developmental delay
Early Crouzon,
Carpenter
e.g.
RAB23,
FGFR2
Severe Crouzon
or Pfeiffer
Brachycephaly,
Plagiocephaly
Rubinstein-Taybi,
Optiz C, others
Involved cranial sutures/resulting head shape
Genetic Workup of Craniosynostosis
Hehr, 2011
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Muenke Syndrome
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Fibroblast Growth Factor Receptors
FGFR1 p.P252R FGFR2 p.P253R FGFR3 p.P250R
1. Ligand-dependent gain-of-
function mutations act by increasing ligand-binding affinity and by overriding ligand-binding specificity of affected receptors
2. Exclusive paternal origin, if de novo
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Fibroblast Growth Factor Receptors
FGFR1 p.P252R FGFR2 p.P253R FGFR3 p.P250R
1. Ligand-dependent gain-of-
function mutations act by increasing ligand-binding affinity and by overriding ligand-binding specificity of affected receptors
2. Exclusive paternal origin, if de novo
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Muenke Syndrome
• Defined by FGFR3 mutation: p.Pro250Arg
• Most common craniosynostosis syndrome
• Muenke syndrome comprises 25% of molecularly defined craniosynostosis
• An estimated 8% of craniosynostosis patients have Muenke syndrome
• Incidence: 1 in 30,000
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Muenke Syndrome
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a
c
b
d
e
a
f
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Phenotypic Features
Solomon BD, Muenke M: Muenke Syndrome in Craniosynostoses: Molecular Genetics, Principles of Diagnosis, and Treatment. Monographs in Human Genetics. Vol. 19, 2010
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Muenke Syndrome Projects in Progress
1. Behavioral phenotype characterization
2. Prevalence of non-syndromic FGFR3 p.P250R deafness
3. Gene modifiers and phenotypic variation
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http://muenkesyndrome.nhgri.nih.gov/
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Behavioral Phenotype
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+ + - + -
+
Craniosynostosis Hearing loss by report
FGFR3 p.P250R +
mutation positive
+ + + -
Muenke Syndrome Pedigree
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+ + - + -
+
Craniosynostosis Hearing loss (by report)
FGFR3 p.P250R +
mutation positive Behavioral Phenotype (by report)
+ + + -
“Behavioral” Phenotype
Muenke Syndrome
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Validated Behavioral Screening Tools
• Vineland Adaptive Behavior Scales-II: Structured Interview form or Parent response
• ABAS-ll
• Social Responsiveness Scale (SRS): parent response
• Social Communication Questionnaire (SCQ): parent response
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Non-syndromic FGFR3 p.P250R Deafness
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Hollway et al. THE LANCET 1998
Deafness as Single FGFR3 p.P250R Manifestation
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Does the FGFR3 p.Pro250Arg Contribute to Non-Syndromic Deafness?
FGFR testing in DNA samples from deaf or hearing impaired individuals
in collaboration with • Kathleen Arnos, Gallaudet University • Arti Pandya, Virgina Commonwealth University • Richard Smith, University of Iowa • Heidi Rehm, Harvard
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Gene Modifiers and Phenotypic Variation
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Phenotypic Variability of Muenke Syndrome in Monozygotic Twins
Escobar et al. Am J Med Genet 2009
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How can we exploit classical genetics or genomics to identify modifiers of human phenotypes for Muenke syndrome?
Classical genetics:
1) Selective breeding of the murine Fgfr3 mutant transgenic lines into new strain backgrounds to look for penetrance or phenotypic variability (labor intensive)
2) Sequence/Genotype known pathway components or targets of FGFR3 signaling (rational candidate approach)
3) Derive new candidate genes by over-expressing the mutant FGFR3 vs. the WT version in various animal models (presumed dominant mutation with novel signaling properties)
4) Then interrogate such genes for variants that correlate with phenotypes
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Muenke Syndrome: A Single Mutation Several Phenotypes
Environment Modifier Genes
De novo mutations (Parent Analysis)
Comprehensive Inventory Using Next Generation
Sequencing: Targeted FGFR3
Deep Sequencing, WES, or WGS.
Rare Variants (Not present in databases)
Compound Heterozygotes or
Homozygotes
Epigenomics and Functional Analysis
(PolyPhen, SIFT)
+ + - + -
+
+ + + -
Craniosynostosis Hearing loss by report
FGFR3 p.P250R +
mutation positive
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Identifying modifier genes for a specific trait will depend on
1) Availability of families segregating the FGFR3
Pro250Arg mutation 2) Number of mutation carriers in each family 3) Number of mutation carriers with and without the
trait (e.g. craniosynostosis, hearing, cognition, behavior)
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Thank you
NHGRI Amaka Agochukwu, now Univ. of Kentucky Paul Kruszka Don Hadley Maria Guillen Ben Solomon, now INOVA Erich Roessler Suzanne Hart Tyler Carney Colin Yarnell
Collaborators Edythe Wiggs, NIH Clinical Center Carmen Brewer, NIDCD, NIH Clinical Center Kathy Arnos, Gallaudet University Arti Pandya, Virginia Commonwealth University Heidi Rehm, Harvard Richard Smith, University of Iowa Hartmut Collmann, University of Würzburg Mauricio Arcos-Burgos, Australian National University
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Maximilian Muenke, M.D. Chief, Medical Genetics Branch
Director, NIH Medical Genetics and Genomic Medicine Residency and Fellowship Program
National Human Genome Research Institute National Institutes of Health, Bethesda, Maryland
Genetics and Genomics of Craniosynostosis Syndromes
Suburban Hospital and Johns Hopkins University School of Medicine, March 7, 2014