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  1. Article ; Online: Chromosomal rearrangement in the 22q11.2 region: a critical locus for sociability and attentional skills.

    Babinet, Marie-Noëlle / Thomas, Nadine / Pons, Linda / Schluth-Bolard, Caroline / Sanlaville, Damien / Demily, Caroline

    Psychiatric genetics

    2023  Volume 33, Issue 5, Page(s) 202–205

    Abstract: Rearrangements of 22q11.2 region, most often deletions and duplications, are responsible for multiple congenital disorders. These rearrangements are involved in syndromes that share some phenotypic similarities. To date, 22q11.2 triplication remains very ...

    Abstract Rearrangements of 22q11.2 region, most often deletions and duplications, are responsible for multiple congenital disorders. These rearrangements are involved in syndromes that share some phenotypic similarities. To date, 22q11.2 triplication remains very rare, with few cases described in the literature. Here, we report for the first time the clinical, neurocognitive, social cognition and psychiatric properties of a 6-year-old child with 22q11.2 triplication, in comparison with a patient with 22q11.2 duplication and 16 cases of patients with 22q11.2 deletion. Chromosomal region 22q11.2 seems to be a critical locus for sociability and attentional skills and rearrangements could be interpreted as a predisposing factor for the development of psychotic symptoms (22q11.2 deletion), a protective factor (22q11.2 duplication) or a tendency factor for hypersociability (22q11.2 triplication).
    MeSH term(s) Child ; Humans ; DiGeorge Syndrome/genetics ; Abnormalities, Multiple ; Syndrome
    Language English
    Publishing date 2023-07-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 1067837-2
    ISSN 1473-5873 ; 0955-8829
    ISSN (online) 1473-5873
    ISSN 0955-8829
    DOI 10.1097/YPG.0000000000000351
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Creatinine levels in French children with Down syndrome up to ten years old.

    Pautonnier, Joanna / Goutte, Sylvie / Dubourg, Laurence Derain / Bacchetta, Justine / Ranchin, Bruno / Rabilloud, Muriel / Sanlaville, Damien

    European journal of pediatrics

    2024  Volume 183, Issue 4, Page(s) 1953–1957

    Abstract: Assess creatinine levels in French children with Down syndrome (DS) on the basis of the relationship between creatinine levels and age. The study included 279 children with DS aged 0 to 10 years who had been regularly monitored between 2004 and 2021 in a ...

    Abstract Assess creatinine levels in French children with Down syndrome (DS) on the basis of the relationship between creatinine levels and age. The study included 279 children with DS aged 0 to 10 years who had been regularly monitored between 2004 and 2021 in a single genetics department and who had had at least one creatinine measurement. The creatinine level curves were established by estimating the median and the quantiles of order 2.5 and 97.5% according to age. A Generalized Additive Model for Location, Scale, and Shape was used. The results showed higher creatinine levels in children with DS than in children from the general population.   Conclusion: The present results allow to propose an original chart of creatinine levels according to age in French children with DS, which should help optimize their medical management and improve the early detection of renal diseases. What is Known: • Creatinine is a product of muscle breakdown and depends on muscle mass and children with Down syndrome have muscle and growth characteristics that differ from those of the general paediatric population. • Serum creatinine values in Japanese children with DS are higher than those of children from the general Japanese population. What is New: • Creatinine values in French children with DS are higher than those of children from the general French population. • The proposed original chart for creatinine values according to age, specifically designed for individuals up to 10 years old, should serve for further investigation, prevention, and follow-up of children with DS.
    MeSH term(s) Child ; Humans ; Down Syndrome/diagnosis ; Down Syndrome/epidemiology ; Creatinine
    Chemical Substances Creatinine (AYI8EX34EU)
    Language English
    Publishing date 2024-02-06
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 194196-3
    ISSN 1432-1076 ; 0340-6199 ; 0943-9676
    ISSN (online) 1432-1076
    ISSN 0340-6199 ; 0943-9676
    DOI 10.1007/s00431-024-05460-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Kidney and urological involvement in Down syndrome: frequent, underestimated, but associated with impaired quality of life and risk of kidney failure.

    Ranchin, Bruno / Bidault, Valeska / Zekre, Franck / DeMul, Aurelie / Sanlaville, Damien / Bacchetta, Justine

    Pediatric nephrology (Berlin, Germany)

    2023  Volume 39, Issue 2, Page(s) 347–355

    Abstract: Patients with Down syndrome (DS) are at risk of multiorgan dysfunction; kidney and urological impairment are common. This is due to a likely increased risk of congenital kidney and urological malformations (odds ratio of 4.5 compared to the general ... ...

    Abstract Patients with Down syndrome (DS) are at risk of multiorgan dysfunction; kidney and urological impairment are common. This is due to a likely increased risk of congenital kidney and urological malformations (odds ratio of 4.5 compared to the general population in one study), more frequent associated comorbidities at risk of kidney dysfunction (such as prematurity in 9-24% of children, intrauterine growth retardation or low birth weight in 20%, and congenital heart disease in 44%), and more frequent lower urinary tract dysfunction (reported in 27-77% of children with DS). If present, malformations and comorbidities at risk of kidney dysfunction warrant regular kidney monitoring in addition to their treatment. Serum creatinine in children with DS has been shown to be higher than in the general population and asymptomatic hyperuricemia is reported in 12-33% of children or young adults with DS. Moreover cryptorchidism and testicular cancer are also more common and should be detected by clinical examination. Thus, persons with DS at risk of presenting kidney and urological impairment should be identified by prenatal ultrasonography, comorbidities at risk of kidney sequelae considered, and during regular medical follow-up, clinically examined and questioned to diagnose testicular anomalies and lower urinary tract dysfunction. This is of importance as such kidney and urological impairments are associated with impaired quality of life and mental health, and risk of kidney failure.
    MeSH term(s) Male ; Child ; Pregnancy ; Female ; Humans ; Down Syndrome/complications ; Down Syndrome/epidemiology ; Down Syndrome/diagnosis ; Testicular Neoplasms/complications ; Quality of Life ; Kidney/abnormalities ; Renal Insufficiency/complications
    Language English
    Publishing date 2023-06-29
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 631932-4
    ISSN 1432-198X ; 0931-041X
    ISSN (online) 1432-198X
    ISSN 0931-041X
    DOI 10.1007/s00467-023-05986-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Plan France Médecine génomique 2025 : la France entre dans l’ère de la médecine génomique.

    Sanlaville, Damien / Vidaud, Michel / Thauvin-Robinet, Christel / Nowak, Frédérique / Lethimonnier, Franck

    La Revue du praticien

    2022  Volume 71, Issue 10, Page(s) 1061–1064

    Title translation French Genomic Medicine Plan 2025 (PFMG2025): France enters the era of genomic medicine.
    MeSH term(s) France ; Genomic Medicine ; Genomics ; Humans
    Language French
    Publishing date 2022-02-11
    Publishing country France
    Document type Journal Article
    ZDB-ID 205365-2
    ISSN 2101-017X ; 0035-2640
    ISSN (online) 2101-017X
    ISSN 0035-2640
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Case report: 7p22.3 deletion and 8q24.3 duplication in a patient with epilepsy and psychomotor delay-Does both possibly act to modulate a candidate gene region for the patient's phenotype?

    Touhami, Rahma / Foddha, Hajer / Alix, Eudeline / Jalloul, Afef / Mougou-Zerelli, Soumaya / Saad, Ali / Sanlaville, Damien / Haj Khelil, Amel

    Frontiers in genetics

    2023  Volume 13, Page(s) 1061539

    Abstract: Background: ...

    Abstract Background:
    Language English
    Publishing date 2023-01-09
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2606823-0
    ISSN 1664-8021
    ISSN 1664-8021
    DOI 10.3389/fgene.2022.1061539
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Variations pathogènes de NDE1 et microlissencéphalie - De la pathologie au développement cérébral normal.

    Cabet, Sara / Guibaud, Laurent / Sanlaville, Damien

    Medecine sciences : M/S

    2020  Volume 36, Issue 10, Page(s) 866–871

    Abstract: Pathogenic variants of the gene NDE1 (Nuclear Distribution Element 1) in humans lead to microlissencephaly which associates a reduced head circumference and a simplified gyration. Microlissencephaly is the most severe deficit of neurogenesis described to ...

    Title translation Microlissencephaly due to pathogenic variants of NDE1: from pathology to normal brain development.
    Abstract Pathogenic variants of the gene NDE1 (Nuclear Distribution Element 1) in humans lead to microlissencephaly which associates a reduced head circumference and a simplified gyration. Microlissencephaly is the most severe deficit of neurogenesis described to date but its precise physiopathological mechanism is not yet well known. The NDE1 gene encodes a phosphoprotein that is essential to neurogenesis and that is expressed in various cell compartments of neuroblasts. More than 60 interaction partners with NDE1 have been reported, notably various proteins involved in formation of the mitotic spindle, in ciliation, in genome protection of dividing neuroblasts or even in apoptosis (like LIS1, dynein or cohesin), which are all avenues that we explore in this review.
    MeSH term(s) Brain/embryology ; Brain/growth & development ; Humans ; Microcephaly/genetics ; Microcephaly/pathology ; Microtubule-Associated Proteins/genetics ; Mitosis/genetics ; Neural Stem Cells/physiology ; Neurogenesis/genetics
    Chemical Substances Microtubule-Associated Proteins ; Nde1 protein, human
    Language French
    Publishing date 2020-10-07
    Publishing country France
    Document type Journal Article ; Review
    ZDB-ID 632733-3
    ISSN 1958-5381 ; 0767-0974
    ISSN (online) 1958-5381
    ISSN 0767-0974
    DOI 10.1051/medsci/2020157
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Comprehensive analysis of F8 large deletions: Characterization of full breakpoint junctions and description of a possible DNA breakage hotspot in intron 6.

    Jourdy, Yohann / Chatron, Nicolas / Fretigny, Mathilde / Dericquebourg, Amy / Sanlaville, Damien / Vinciguerra, Christine

    Journal of thrombosis and haemostasis : JTH

    2022  Volume 20, Issue 10, Page(s) 2293–2305

    Abstract: Background: Large F8 deletions represent 3-5% of the variations found in severe hemophilia A patients, but only a few deletion breakpoints have been characterized precisely.: Objectives: Resolving at the nucleotide level 24 F8 large deletions to ... ...

    Abstract Background: Large F8 deletions represent 3-5% of the variations found in severe hemophilia A patients, but only a few deletion breakpoints have been characterized precisely.
    Objectives: Resolving at the nucleotide level 24 F8 large deletions to provide new data on the mechanisms involved in these rearrangements.
    Methods: Breakpoint junctions of 24 F8 large deletions were characterized using a combination of long-range polymerase chain reaction, whole F8 NGS sequencing, and Sanger sequencing. Repeat elements, non-B DNA, and secondary structures were analyzed around the breakpoints.
    Results: Deletions ranged from 1.667 kb to 0.5 Mb in size. Nine involved F8 neighboring genes. Simple blunt ends and 2-4 bp microhomologies were identified at the breakpoint junctions of 10 (42%) and 8 (33%) deletions, respectively. Five (21%) deletions resulted from homeologous recombination between two Alu elements. The remaining case corresponded to a more complex rearrangement with an insertion of a 19 bp-inverted sequence at the junction. Four different breakpoints were located in a 562-bp region in F8 intron 6. This finding suggested that this region, composed of two Alu elements, is a DNA breakage hotspot. Non-B DNA and secondary structures were identified in the junction regions and may contribute to DNA breakage.
    Conclusion: Molecular characterization of deletion breakpoints revealed that non-homologous non-replicative DNA repair mechanisms and replication-based mechanisms seemed to be the main causative mechanisms of F8 large deletions. Moreover, we identified a possible F8 DNA breakage hotspot involved in non-recurrent rearrangements.
    MeSH term(s) Base Sequence ; DNA/genetics ; Humans ; Introns ; Nucleotides ; Sequence Deletion
    Chemical Substances Nucleotides ; DNA (9007-49-2)
    Language English
    Publishing date 2022-08-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2112661-6
    ISSN 1538-7836 ; 1538-7933
    ISSN (online) 1538-7836
    ISSN 1538-7933
    DOI 10.1111/jth.15835
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  8. Article ; Online: Whole F8 gene sequencing identified pathogenic structural variants in the remaining unsolved patients with severe hemophilia A.

    Jourdy, Yohann / Chatron, Nicolas / Frétigny, Mathilde / Zawadzki, Christophe / Lienhart, Anne / Stieltjes, Natalie / Rohrlich, Pierre-Simon / Thauvin-Robinet, Christel / Volot, Fabienne / Hamida, Yasmine Ferhat / Hariti, Ghania / Leuci, Alexandre / Dargaud, Yesim / Sanlaville, Damien / Vinciguerra, Christine

    Journal of thrombosis and haemostasis : JTH

    2024  

    Abstract: Background: No F8 genetic abnormality is detected in approximately 1% to 2% of patients with severe hemophilia A (HA) using conventional genetic approaches. In these patients, deep intronic variation or F8 disrupting genomic rearrangement could be ... ...

    Abstract Background: No F8 genetic abnormality is detected in approximately 1% to 2% of patients with severe hemophilia A (HA) using conventional genetic approaches. In these patients, deep intronic variation or F8 disrupting genomic rearrangement could be causal.
    Objectives: The study aimed to identify the causal variation in families with a history of severe HA for whom genetic investigations failed.
    Methods: We performed whole F8 gene sequencing in 8 propositi. Genomic rearrangements were confirmed by Sanger sequencing of breakpoint junctions and/or quantitative polymerase chain reaction.
    Results: A structural variant disrupting F8 was found in each propositus, so that all the 815 families with a history of severe HA registered in our laboratory received a conclusive genetic diagnosis. These structural variants consisted of 3 balanced inversions, 3 large insertions of gained regions, and 1 retrotransposition of a mobile element. The 3 inversions were 105 Mb, 1.97 Mb, and 0.362 Mb in size. Among the insertions of gained regions, one corresponded to the insertion of a 34 kb gained region from chromosome 6q27 in F8 intron 6, another was the insertion of a 447 kb duplicated region from chromosome 9p22.1 in F8 intron 14, and the last one was the insertion of an Xq28 349 kb gained in F8 intron 5.
    Conclusion: All the genetically unsolved cases of severe HA in this cohort were due to structural variants disrupting F8. This study highlights the effectiveness of whole F8 sequencing to improve the molecular diagnosis of HA when the conventional approach fails.
    Language English
    Publishing date 2024-03-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 2112661-6
    ISSN 1538-7836 ; 1538-7933
    ISSN (online) 1538-7836
    ISSN 1538-7933
    DOI 10.1016/j.jtha.2024.03.002
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  9. Article ; Online: Clinical and molecular cytogenetic studies of five new patients with 20q11q12 deletion and review of the literature: Proposition of two critical regions.

    Bensaid, Souad / Bendahmane, Malika / Loddo, Sara / Poke, Gemma / Januel, Louis / Nicolle, Romain / Malan, Valérie / Chatron, Nicolas / Ottombrino, Silvia / Dentici, Maria Lisa / Novelli, Antonio / Digilio, Maria Cristina / Sanlaville, Damien

    American journal of medical genetics. Part A

    2024  , Page(s) e63580

    Abstract: Deletions of the long arm of chromosome 20 (20q) are rare, with only 16 reported patients displaying a proximal interstitial 20q deletion. A 1.62 Mb minimal critical region at 20q11.2, encompassing three genes GDF5, EPB41L1, and SAMHD1, is proposed to be ...

    Abstract Deletions of the long arm of chromosome 20 (20q) are rare, with only 16 reported patients displaying a proximal interstitial 20q deletion. A 1.62 Mb minimal critical region at 20q11.2, encompassing three genes GDF5, EPB41L1, and SAMHD1, is proposed to be responsible for this syndrome. The leading clinical features include growth retardation, intractable feeding difficulties with gastroesophageal reflux, hypotonia and psychomotor developmental delay. Common facial dysmorphisms including triangular face, hypertelorism, and hypoplastic alae nasi were additionally reported. Here, we present the clinical and molecular findings of five new patients with proximal interstitial 20q deletions. We analyzed the phenotype and molecular data of all previously reported patients with 20q11.2q12 microdeletions, along with our five new cases. Copy number variation analysis of patients in our cohort has enabled us to identify the second critical region in the 20q11.2q12 region and redefine the first region that is initially identified. The first critical region spans 359 kb at 20q11.2, containing six MIM genes, including two disease-causing genes, GDF5 and CEP250. The second critical region spans 706 kb at 20q12, encompassing four MIM genes, including two disease-causing genes, MAFB and TOP1. We propose GDF5 to be the primary candidate gene generating the phenotype of patients with 20q11.2 deletions. Moreover, we hypothesize TOP1 as a potential candidate gene for the second critical region at 20q12. Of note, we cannot exclude the possibility of a synergistic role of other genes involved in the deletion, including a contiguous gene deletion syndrome or position effect affecting both critical regions. Further studies focusing on patients with proximal 20q deletions are required to support our hypothesis.
    Language English
    Publishing date 2024-03-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2108614-X
    ISSN 1552-4833 ; 0148-7299 ; 1552-4825
    ISSN (online) 1552-4833
    ISSN 0148-7299 ; 1552-4825
    DOI 10.1002/ajmg.a.63580
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Idiopathic generalized epilepsy in a family with SCN4A-related myotonia.

    Talarico, Mariagrazia / Fortunato, Francesco / Labalme, Audrey / Januel, Louis / Chatron, Nicolas / Sanlaville, Damien / Sammarra, Ilaria / Gagliardi, Monica / Procopio, Radha / Valentino, Paola / Annesi, Grazia / Lesca, Gaetan / Gambardella, Antonio

    Epilepsia open

    2024  

    Abstract: Objectives: Myotonia is a clinical sign typical of a group of skeletal muscle channelopathies, the non-dystrophic myotonias. These disorders are electrophysiologically characterized by altered membrane excitability, due to specific genetic variants in ... ...

    Abstract Objectives: Myotonia is a clinical sign typical of a group of skeletal muscle channelopathies, the non-dystrophic myotonias. These disorders are electrophysiologically characterized by altered membrane excitability, due to specific genetic variants in known causative genes (CLCN1 and SCN4A). Juvenile Myoclonic Epilepsy (JME) is an epileptic syndrome identified as idiopathic generalized epilepsy, its genetics is complex and still unclarified. The co-occurrence of these two phenotypes is rare and the causes likely have a genetic background. In this study, we have genetically investigated an Italian family in which co-segregates myotonia, JME, or abnormal EEG without seizures was observed.
    Methods: All six individuals of the family, 4 affected and 2 unaffected, were clinically evaluated; EMG and EEG examinations were performed. For genetic testing, Exome Sequencing was performed for the six family members and Sanger sequencing was used to confirm the candidate variant.
    Results: Four family members, the mother and three siblings, were affected by myotonia. Moreover, EEG recordings revealed interictal generalized sharp-wave discharges in all affected individuals, and two siblings were affected by JME. All four affected members share the same identified variant, c.644 T > C, p.Ile215Thr, in SCN4A gene. Variants that could account for the epileptic phenotype alone, separately from the myotonic one, were not identified.
    Significance: These results provide supporting evidence that both myotonic and epileptic phenotypes could share a common genetic background, due to variants in SCN4A gene. SCN4A pathogenic variants, already known to be causative of myotonia, likely increase the susceptibility to epilepsy in our family.
    Plain language summary: This study analyzed all members of an Italian family, in which the mother and three siblings had myotonia and epilepsy. Genetic analysis allowed to identify a variant in the SCN4A gene, which appears to be the cause of both clinical signs in this family.
    Language English
    Publishing date 2024-03-27
    Publishing country United States
    Document type Journal Article
    ISSN 2470-9239
    ISSN (online) 2470-9239
    DOI 10.1002/epi4.12920
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