
==== Front
Ital J Pediatr
Ital J Pediatr
Italian Journal of Pediatrics
1824-7288
BioMed Central London

39294662
1756
10.1186/s13052-024-01756-0
Case Report
Neonatal Marfan syndrome: a case report of a novel fibrillin 1 mutation, with genotype-phenotype correlation and brief review of the literature
Pugnaloni Flaminia 12
http://orcid.org/0000-0002-9076-9838
De Rose Domenico Umberto derosedomenicoumberto@gmail.com

1
Digilio Maria Cristina 3
Magliozzi Monia 4
Braguglia Annabella 5
Valfrè Laura 6
Toscano Alessandra 7
Dotta Andrea 1
Di Pede Alessandra 1
1 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Neonatal Intensive Care Unit, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
2 https://ror.org/02be6w209 grid.7841.a Department of Pediatrics, Obstetrics and Gynecology, “Sapienza” University of Rome, Rome, 00161 Italy
3 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Medical Genetics Unit, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
4 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Translational Cytogenomics Research Unit, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
5 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Neonatal Sub-Intensive Care Unit and Follow-up, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
6 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Neonatal Surgery Unit, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
7 https://ror.org/02sy42d13 grid.414125.7 0000 0001 0727 6809 Perinatal Cardiology Unit, “Bambino Gesù” Children’s Hospital IRCCS, Rome, 00165 Italy
18 9 2024
18 9 2024
2024
50 18314 6 2023
3 9 2024
© The Author(s) 2024
2024
https://creativecommons.org/licenses/by/4.0/ Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
Background

Neonatal Marfan syndrome (nMFS) is a rare condition characterized by severe phenotype and poor prognosis. nMFS is caused by mutations in a specific region of the fibrillin 1 gene (FBN1). Prompt recognition of typical signs of neonatal presentation, such as characteristic facial anomalies with senile appearance, arthrogryposis, and campto-arachnodactyly, is fundamental for performing an early cardiological examination. This usually reveals rapidly progressive cardiovascular disease due to severe atrioventricular valve dysfunction.

Case presentation

Herein, we report the case of an early-onset cardiac failure in a neonate with Marfan syndrome, with a brief review of the literature of cases with cardiac involvement in neonatal age. Clinical exome sequencing identified the novel heterozygous de novo missense variant c.3152T > G in FBN1 gene (NM_000138.4), causing the aminoacidic change p.Phe1051Cys. Phenotype-genotype correlation led to a multidisciplinary diagnostic and management workflow.

Conclusion

The prompt recognition of a typical phenotype such as that of Marfan syndrome should lead to a detailed evaluation and close follow-up of cardiac morphology and function. Indeed, multi-disciplinary evaluation based on genotype-phenotype correlations of nMFS cases is essential to finding out the best medical and surgical approach, predicting the relevant impact on patient prognosis, and adequately counseling their families.

Keywords

Neonatal Marfan syndrome
Cardiac failure
Phenotype-genotype correlation
Clinical genetics
Case report
Italian Ministry of HealthCurrent Research funds issue-copyright-statement© Società Italiana di Pediatria 2024
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pmcBackground

Neonatal Marfan syndrome (nMFS) is a rare condition characterized by severe phenotype and poor prognosis, caused by mutations in the specific “neonatal region” of the fibrillin 1 gene (FBN1) [1]. Prompt recognition of typical signs of neonatal presentation, such as characteristic facial anomalies with senile appearance, arthrogryposis, and campto-arachnodactyly, is fundamental for performing an early cardiological examination. This usually reveals rapidly progressive cardiovascular disease due to severe atrioventricular valve dysfunction.

Herein, we report the case of an early-onset cardiac failure in a neonate with Marfan syndrome, with a brief review of the literature of cases with cardiac involvement in neonatal age. Clinical exome sequencing revealed a de novo missense variant of the FBN1 gene. Phenotype-genotype correlation led to a multidisciplinary diagnostic and management workflow.

Case presentation

A female neonate spontaneously conceived was born in a 2nd-level hospital at 39 weeks of gestational age (GA), to a 32-year-old primigravida through spontaneous delivery. Oligohydramnios and multiple complex choroid cysts were noticed in the last two weeks of pregnancy. No invasive prenatal testing was performed. Family history revealed a first-degree cousin (from the paternal side) affected by de novo Baraitser-Winter syndrome, and a paternal aunt whose pregnancy was interrupted because of a not-specified chromosomal disorder.

Apgar score was 8 and 9 at the 1st and 5th minutes, respectively. Birth weight was 2750 gr (16th centile, z-score: -1,01 SDS according to INeS charts [2]), length 49 cm (47th centile, z-score: -0.07 SDS), and head circumference 35 cm (86th centile, z-score: 1.06 SDS). At birth, several dysmorphic features were noticed, including brachycephaly, triangular and asymmetric face with a typical “senile” appearance (Fig. 1.A) and hypertelorism, down-slanted palpebral fissures, blepharophimosis, blue sclerae, anteverted nares, narrow mouth, micrognathia, and low-set ear. A distal arthrogryposis of the upper (Fig. 1.B) and lower limbs and severe arachnodactyly of hands (Fig. 1.C) and feet were evident. In particular, the Steinberg sign (well-known as the “thumb” sign) was positive in both hands (Fig. 1.C).

Fig. 1 Dysmorphic features of our patient: A) senile facial appearance; B) distal arthrogryposis of upper limbs; C) severe arachnodactyly of hands and positive Steinberg sign (or thumb sign) of left hand

Cerebral ultrasound (CUS) performed within the first days of life confirmed multiple microcysts of the choroid plexus and increased echogenicity in the periventricular white matter. Brain magnetic resonance imaging (MRI) revealed a dysplastic appearance of cerebellar vermis and hemispheres, with a markedly thickened cerebellar cortex and loss of normal arborization of white matter. Hypoxic-ischemic lesions were noticed in the right frontal area. Chest computed tomography (CT), performed because of respiratory distress, showed a right posterolateral diaphragmatic relaxation with ipsilateral atelectasis of lung tissue. Skeletal X-ray showed no significant malformations. Echocardiography within the first 5 days of life yielded patent foramen ovale and patent ductus arteriosus (both with left-to-right shunt), mild tricuspid insufficiency, and moderate mitral insufficiency. A mild dilatation of the aortic bulb was also observed.

The neonate was admitted on the 15th day of life to our 3rd-level children’s hospital to perform a specialistic evaluation. Physical examination revealed fair general conditions with polypnea and mild dyspnea; a 3/6 systolic murmur was audible. Cardiomegaly and dilation of the left ventricle were detected by echocardiography, with a mild-to-moderate biventricular dysfunction. A severely dysplastic mitral valve showed severe multi-jet insufficiency (Fig. 2.A), and aortic valve showed mild insufficiency (Fig. 2.B) and moderate dilation of Valsalva sinuses. The right ventricle was mildly dilated, with mild-to-moderate insufficiency of the tricuspid valve, and a dysplastic pulmonary valve with moderate insufficiency was also observed. The ophthalmological examination did not reveal pathological signs. Multivalvular involvement required initial conservative medical treatment using intravenous furosemide (up to 3 mg/kg) associated with oral spironolactone and captopril. Medical treatment led to a gradual decreasing trend of brain natriuretic peptide (BNP) and troponin values. The baby was discharged in her 5th month of life.

Fig. 2 Cardiac involvement in our patient: A) severe mitral insufficiency from a 4-chamber view; B) aortic valve insufficiency from long axis view

Blood karyotype and Chromosomal Microarray Analysis using platform Illumina® CytoSNP 850k showed no pathogenic results. After these negative results, at 2 months of life, clinical exome analysis of trios was performed on DNA extracted from circulating leukocytes using kit Twist Custom Panel (Twist Bioscience) on the Illumina sequencing platform (NovaSeq6000, San Diego, CA). Next Generation Sequencing (NGS) analysis identified the novel heterozygous de novo missense variant c.3152T > G in FBN1 gene (NM_000138.4), causing the aminoacidic change p.Phe1051Cys. The variant was never described in the literature; it was not on the Genome Aggregation Database (gnomAD) and was classified as probably pathogenetic (class 4) according to guidelines of the American College of Medical Genetics and Genomics (ACMG) [3].

Subsequently, severe feeding intolerance and gastroesophageal reflux led to progressive malnutrition and a significant impact on children’s physical growth; at the 6th month of life, the infant was admitted again to our hospital and required nutrition support through the placement of a percutaneous endoscopic gastrostomy (PEG) tube. Despite maximal medical treatment and PEG placement, the infant progressively developed symptoms of congestive heart failure resulting from severe multivalvular insufficiency. At about 7 months of life, she underwent cardiosurgical intervention with mitral valvuloplasty and the use of annuloplasty, tricuspid, and pulmonary valvuloplasty.

Unfortunately, at 9 months and 19 days, the infant died of complications related to cardiac failure and severe malnutrition status (weight at death time 5070 gr, z-score: -3.04 according to WHO charts [4]).

Methods

In order to review the literature about cardiac involvement in neonatal Marfan syndrome and compare other cases to ours, an extensive literature search in the MEDLINE database (via PubMed) has been performed up to December 31st, 2022. The following keywords, “neonatal,” “Marfan,” and “syndrome,” were searched as entree terms as well. All 239 retrieved articles of the last 20 years were screened, and then full texts of records deemed eligible for inclusion were assessed. References in the relevant papers were also reviewed. Papers written in languages other than English were excluded. Papers reporting a full description of the cases were included.

We systemically collected and summarized information on patients’ characteristics, cardiac involvement and procedures, and molecular findings.

Results

A brief review of the literature on nMFS cases with cardiac involvement in the last 20 years is displayed in Table 1 [1, 5–28]. Beyond our case, we included other 27 cases, of whom three were born preterm. All 28 cases except one (reported by Postma et al.) had a birthweight greater than 2500 g. The mitral valve was involved in all cases, whereas the tricuspid valve was in 20/28 patients (71.4%). Aortic structures were involved in 23/28 cases (82.1%). Fifteen patients (53.6%) underwent cardiac procedures. FBN1 was the involved gene in all patients where a genetic diagnosis was available (21/28: 75%). Thirteen patients (46.4%) died at the time of writing.

Table 1 Brief review of nMFS cases in the last 20 years. NA: not available

Author, year	Sex	GA (weeks)	Delivery mode	Birthweight (centile) / Length (centile) / Head circumference (centile)	Mitral valve insufficiency / prolapse	Tricuspid valve insufficiency / prolapse	Aortic root dilation / Aortic valve regurgitation	Cardiac procedures	Molecular findings	Inheritation pattern	Age at last follow-up visit, outcome	
Jacobs et al., 2002	F	At term	Vaginal delivery	2615 g (10th) / 52 cm (90th) / 32.5 cm (5th-10th)	Yes	Yes	Yes	Not performed	FBN1, T3276C, exon 24	NA	3.5 months, died	
Shinawi et al., 2005	M	At term	Cesarean section	2880 g (25th) / 56 cm (> 95th) / NA	Yes	Yes	No	Balloon dilatation of pulmonary valve (4 days)	FBN1, IVS31-2 A > G, intron 31	NA	4.5 months, died	
Ramaswamy et al., 2006	NA	At term	NA	3600 (75th) / 52 cm (75th)	Yes	Yes	Yes	Mitral valve repair (10 months)	NA	NA	15 months, alive	
Sutherell et al., 2007	M	At term	NA	3300 (25th) / 51.5 cm (75th) / 34.5 cm (25th)	Yes	Yes	Yes	Medical treatment	FBN1, novel missense mutation, c.3256T > C, exon 26	De novo	4 days, died	
Tekin et al., 2007	M	40	NA	3650 g (50th) / NA / NA	Yes	Yes	Yes	Medical treatment	NA	NA	3 months, died	
Kochilas et al., 2008	F	37	Cesarean section	2900 g / NA / NA	Yes	Yes	Yes	Palliative care	FBN1, heterozygous 3256T > C, exon 26	De novo	69 days, died	
Brito-Filho et al., 2013	M	At term	Cesarean section	3630 g / 51 cm / NA	Yes	Yes	Yes	Bentall-De Bono procedure (2 years), two mitral valve replacements (4 and 7 years)	NA	NA	7 years, alive	
Šípek Jr. et al., 2014	F	40	Vaginal delivery	3670 (75th) / 53 cm (97th) / 34,5 (50th)	Yes	Yes	No	Medical treatment	FBN1, novel intronic c.4211-32_-13 del mutation, exon 35	Maternally inherited (mosaicism)	7 months, died	
Elshershari & Harris, 2014	M	At term	NA	3200 g (25th) / 51 cm (50th) / NA	Yes	No	Yes	Medical treatment	FBN1, a heterozygous c.3959G. A, exon 31	Paternally inherited	3 months, alive	
Amado et al., 2014	F	38	Cesarean section	3130 g (25th) / 46.5 cm (5-10th) / 35.5 cm (50-75th)	Yes	Yes	Yes	Mitral valvuloplasty (6 months)	FBN1, c.3458 G > A, exon 26	De novo	2 years and 10 months, alive	
Ozyurt et al., 2015	F	39	Vaginal delivery	NA / NA / NA	Yes	Yes	Yes	Medical treatment	Not performed	NA	68 days, died	
Bhutia et al., 2016	NA	At term	Vaginal delivery	NA / NA / NA	Yes	Yes	Yes	Medical treatment	Not performed	NA	3 months, died	
Kitahara et al., 2016	M	38	Cesarean section	2295 g / 43.7 cm / NA	Yes	No	Yes	Mitral commissuroplasty (18 months), palliative procedure (3 years and 8 months)	NA	NA	11 years, alive	
Le Gloan et al., 2016	F	39	Cesarean section	2950 g (-0.5 SD) / 50 cm (0 SD) / 33.5 cm (-1 SD)	Yes	Yes	Yes	Mitral and tricuspid valve annuloplasty (2 months)	FBN1, intronic mutation c.6163 + 3_6163 + 6del, exon 49	Maternally inherited	4 months, died	
Maeda, 2016	M	40	NA	3768 g (90-97th) / 52.9 cm (> 97th) / NA	Yes	No	Yes	Medical treatment	FBN1, missense mutation (c. 3217 G > A), exon 26	NA	7 months, died	
Maeda, 2016	F	37	Cesarean section	2850 g (25-50th) / NA / NA	Yes	Yes	No	Mitral and tricuspid valve annuloplasty (5 months); mitral valve replacement(12 months)	FBN1, exon-skipping mutation (c.IVS29 + 1G > A), exon 29	NA	22 months, died	
Maeda, 2016	F	37	Cesarean section	2592 g (10-25th) / 50 cm (50-75th) / NA	Yes	Yes	No	Mitral and tricuspid valve annuloplasty (1 month)	FBN1, exon-skipping mutation (c.IVS30 + 1G > A), exon 30	NA	2 months, died	
Peng et al., 2016	F	At term	Vaginal delivery	2600 g / NA / NA	Yes	Yes	Yes	NA	FBN1 missense mutation c.3331 T > C (p.Cys1111Arg), exon 26	De novo	8 months, alive	
Heo et al., 2017	M	36	Vaginal delivery	3000 g (75-90th) / 54.5 cm (> 99th) / 35.5 cm (99th)	Yes	No	Yes	Surgical repair of rupture of mitral chordae (6 months)	FBN1, missense mutation (c. 3217 G > A), exon 26	NA	NA	
Solé-Ribalta et al., 2019	NA	36	NA	NA / NA / NA	Yes	Yes	Yes	Palliative care	FBN1, heterozygous mutation (NM_000138.4): c.[3208 + 5G > A)	De novo	1 month, died	
Tognato et al., 2019	M	At term	Cesarean section	3690 g (70th) / 56 cm (100th) / 36 cm (86th)	Yes	Yes	Yes	Mitral and tricuspidal valvuloplasty (11 months)	FBN1, heterozygous mutation c.3143 T > C (p.Ile1048Thr) w	NA	3 months, alive	
Wojcik et al., 2019	NA	40	Vaginal delivery	NA	Yes	No	Yes	Aortic root replacement (3 months); mitral and tricuspid annuloplasty (12 months)	FBN1, heterozygous 385 bp deletion[GRCh38, exon 33	De novo	3 years, died	
Veiga-Fernández et al., 2020	NA	37	Cesarean section	2530 g / NA / NA	Yes	No	No	Palliative care	NA	NA	3 months, died	
Postma et al., 2021	F	32	Cesarean section	1710 g / NA / NA	Yes	Yes	Yes	Mitral annuloplasty and tricuspid commisuroplast (7 months)	FBN1, heterozygous splice site variant, IVS21 + 2T > C, exon15	Paternally inherited	14months, died	
Yoon and Kong, 2021	M	40	Cesarean section	3560 g (75th) / 56.5 cm (90th) / 36 cm (90th)	Yes	No	No/Yes	Palliative care	FBN1, c.3964 + 1G > T, exon 32	NA	32 days, died	
Motonaga et al., 2022	F	40	Vaginal delivery	3008 g / NA / NA	Yes	No	Yes	Mitral valve replacement (6 months)	FBN1,heterozygous missense variant (c.3379G > T), exon27	De novo	16 years, alive	
Kawamura et al., 2022	M	38	Vaginal delivery	NA	Yes	Yes	No	Mitral and tricuspid valvuloplasty (6 months); mitral valve and tricuspid valve replacement (7 months)	FBN1, heterozygous missense variant of c.3706T > C (p. Cys1236Arg), exon 29	NA	13 months, alive	

Discussion and conclusion

We compared the severe cardiac involvement of a neonate with Marfan syndrome to the cases available in the literature. Cardiac involvement is the main determinant in the prognosis of neonates with Marfan syndrome, and it is usually life-threatening. Severe valvular disease affecting mostly mitral and tricuspid valves quickly progresses to congestive heart failure and premature death within the first 2 years of life [1, 21, 22, 29, 30]. Indeed, cardiac involvement in neonates is usually characterized by severe multivalvular insufficiency instead of aortic structures involvement, which is a typical feature in adults and older children [31, 32].

Congenital pulmonary emphysema is also often detected in nMFS [33]. Rarely, patients with nMFS may develop progressive but not fatal heart failure; some young adults have been described [34].

Molecular analysis shows that most nMFS mutations are sporadic and occur in the so-called “neonatal region” of FBN1 gene mapping between exons 24 and 32 [35, 36].

In our case, we identified a novel missense variant, p.Phe1051Cys, located in exon 26 of the FBN1 gene inside the “neonatal critical region” that was not previously reported in the literature.

Interesting genotype-phenotype associations for both cardiovascular and extra-cardiovascular manifestations were identified in the pediatric population [37]. Previous studies and case reports demonstrated that mutations located in FBN1 “neonatal region” are usually associated with a rapidly worsening cardiac disease, poor response to medications [36], and severe congestive heart failure, which represent the main cause of early death. In particular, patients carrying variants in a specific region (amino acids 1028–1088, corresponding to exon 25 and a few residues from exon 26) show a worse prognosis with heart failure-related death within the first year of life, irrespective of gender [38].

Early genotype analysis and prompt phenotype recognition can potentially drive accurate genetic counseling. Indeed, the prompt recognition of a typical phenotype such as that of Marfan syndrome should lead to a detailed evaluation and close follow-up of cardiac morphology and function. Timely diagnosis is increasingly important in looking for genotype-phenotype characterization and improving early therapeutic strategies.

Despite their low quantity in skeletal matrices, MFS causes severe skeletal defects, highlighting the importance of fibrillin-1 and microfibrils in bone formation and function [39]. The extent of musculoskeletal disease is quite significant in older patients with Marfan syndrome: scoliosis, pectus deformity, and deformity of the foot. Many will need a specific follow-up, requiring corrective surgery during their life span [40].

Similarly, fibrillin-1-containing microfibrils are ubiquitous in the normal eye. Ectopia lentis in MFS patients is likely caused by an FBN1 mutation that prevents fibrillin-1 production. If they survive, MFS patients experience different ocular features depending on the mutation and severity of the illness. Patients with MFS typically acquire lenticular and/or axial myopia before the age of ten and should see an ophthalmologist to examine their near-sightedness [39].

Multi-disciplinary evaluation based on genotype-phenotype correlations of nMFS cases is essential to determine the best medical and surgical approach, predict the relevant impact on patient prognosis, and adequately counsel their families. MFS is an example of a syndrome where an early personalized approach to address a dynamic, genetically determined condition can make a difference in outcome [41].

In light of this, a careful evaluation of all clinical signs by neonatologists is mandatory: in particular, the Steinberg sign (also known as the thumb sign) presence should be considered a potential handle sign for diagnostic suspicion, and every neonatologist should rule out Marfan syndrome in cases like this. This can be useful to perform a correct differential diagnosis, like, for example, with distal arthrogryposis syndromes or other congenital defects with cardiac involvement, with the aim of timely reaching the correct diagnosis [42, 43].

The current databases should be updated with the genomic and phenotypic findings of the present patient in order to provide a better characterization of such a rare disease. Additional patients and the identification of new mutations will increase the knowledge of the molecular bases and the pathogenic mechanisms underlying Marfan syndrome with neonatal onset.

Finally, clinicians must be aware of the possibility that neonates may have a severely poor outcome, even in the absence of symptoms in the first weeks of life.

Acknowledgements

None.

Author contributions

FP took care of the patient, reviewed the literature, and drafted the first version of the manuscript. DUDR took care of the patient, reviewed the literature, collected the clinical data, and revised the manuscript. MCD and MM contributed to the acquisition of genetic data and revised the manuscript. AB and AD took care of the patient and revised the manuscript. LV performed a surgical assessment and follow-up. AT performed cardiological assessment and follow-up. ADP conceptualized the report, revised the manuscript, and gave final approval of the version to be submitted. All authors approved the final manuscript as submitted.

Funding

This work was supported by the Italian Ministry of Health with “Current Research funds”.

Data availability

All data generated or analysed during this study are included in this published article.

Declarations

Ethical approval and consent to participate

Clinical data were obtained in accordance with the ethical standards of our hospital and Helsinki Declaration. Personal data were restricted to essential information, and were treated in order to guarantee the respect of privacy of the involved patients, as specifically stated by Italian Law D.Lgs n.196 of 2003 about personal data protection. Therefore, the study did not require preliminary evaluation by the local Ethical Committee. Written informed consent was obtained from the parents for publication of this case report and accompanying images.

Consent for publication

Written informed consent was obtained from the parents for publication of this case report and accompanying images.

Competing interests

The authors declare that they have no competing interests.

Abbreviations

ACMG American College of Medical Genetics

CT Computed tomography

CUS Cerebral ultrasound

FBN1 Fibrillin 1

GA Gestational age

gnomAD Genome Aggregation Database

MRI Magnetic resonance imaging

NGS Next Generation Sequencing

nMFS Neonatal Marfan syndrome

PEG Percutaneous endoscopic gastrostomy

SDS Standard deviation

WHO World Health Organization

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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