BICD2 (BICD Cargo Adaptor 2, MIM*609797) mutations are associated with severe prenatal-onset forms of spinal muscular atrophy, lower extremity-predominant 2B (SMALED2B MIM 618291) or milder forms with childhood-onset (SMALED2A MIM 615290). Etiopathogenesis is not fully clarified and a wide spectrum of phenotypic presentations is reported, ranging from extreme prenatal forms with adverse outcome, to slow progressive late-onset forms. We report a fetus at 22 gestational weeks with evidence of Arthrogryposis Multiplex Congenita on ultrasound, presenting with fixed extended lower limbs and flexed upper limbs, bilateral clubfoot and absent fetal movements. A trio-based prenatal Exome Sequencing was performed, disclosing a de novo heterozygous pathogenic in frame deletion (NM_015250.3: c.1636_1638delAAT; p.Asn546del) in BICD2. After pregnancy termination, quantitative analysis on NeuN immunostained spinal cord sections of the ventral horns, revealed that neuronal density was markedly reduced compared to the one of an age-matched normal fetus and an age-matched type-I Spinal Muscular Atrophy sample, used as a comparative model. The present case, the first prenatally diagnosed and neuropathologically characterized, showed an early motor neuron loss in SMALED2B, providing further insight into the pathological basis of BICD2-opathies.

Fetal early motor neuron disruption and prenatal molecular diagnosis in a severe BICD2-opathy / Marchionni, Enrica; Agolini, Emanuele; Mastromoro, Gioia; Guadagnolo, Daniele; Coppola, Giulia; Roggini, Mario; Riminucci, Mara; Novelli, Antonio; Giancotti, Antonella; Corsi, Alessandro; Pizzuti, Antonio. - In: AMERICAN JOURNAL OF MEDICAL GENETICS. PART A. - ISSN 1552-4825. - 185:5(2021), pp. 1509-1514. [10.1002/ajmg.a.62111]

Fetal early motor neuron disruption and prenatal molecular diagnosis in a severe BICD2-opathy

Marchionni, Enrica
Primo
;
Mastromoro, Gioia;Guadagnolo, Daniele;Coppola, Giulia;Roggini, Mario;Riminucci, Mara;Giancotti, Antonella;Corsi, Alessandro
Penultimo
;
Pizzuti, Antonio
Ultimo
2021

Abstract

BICD2 (BICD Cargo Adaptor 2, MIM*609797) mutations are associated with severe prenatal-onset forms of spinal muscular atrophy, lower extremity-predominant 2B (SMALED2B MIM 618291) or milder forms with childhood-onset (SMALED2A MIM 615290). Etiopathogenesis is not fully clarified and a wide spectrum of phenotypic presentations is reported, ranging from extreme prenatal forms with adverse outcome, to slow progressive late-onset forms. We report a fetus at 22 gestational weeks with evidence of Arthrogryposis Multiplex Congenita on ultrasound, presenting with fixed extended lower limbs and flexed upper limbs, bilateral clubfoot and absent fetal movements. A trio-based prenatal Exome Sequencing was performed, disclosing a de novo heterozygous pathogenic in frame deletion (NM_015250.3: c.1636_1638delAAT; p.Asn546del) in BICD2. After pregnancy termination, quantitative analysis on NeuN immunostained spinal cord sections of the ventral horns, revealed that neuronal density was markedly reduced compared to the one of an age-matched normal fetus and an age-matched type-I Spinal Muscular Atrophy sample, used as a comparative model. The present case, the first prenatally diagnosed and neuropathologically characterized, showed an early motor neuron loss in SMALED2B, providing further insight into the pathological basis of BICD2-opathies.
BICD2; SMALED2B; exome sequencing; motor neurons; prenatal diagnosis
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Fetal early motor neuron disruption and prenatal molecular diagnosis in a severe BICD2-opathy / Marchionni, Enrica; Agolini, Emanuele; Mastromoro, Gioia; Guadagnolo, Daniele; Coppola, Giulia; Roggini, Mario; Riminucci, Mara; Novelli, Antonio; Giancotti, Antonella; Corsi, Alessandro; Pizzuti, Antonio. - In: AMERICAN JOURNAL OF MEDICAL GENETICS. PART A. - ISSN 1552-4825. - 185:5(2021), pp. 1509-1514. [10.1002/ajmg.a.62111]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1496110
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