Human Phenotype Ontology 
Grandparent Node:
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Seizure (HP:0001250)help
Parent Node:
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Generalized-onset seizure (HP:0002197)help
..Starting node
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Atonic seizure (HP:0010819)help
Term ID: 10819
Name: Atonic seizure
Synonym: Astatic seizure; Astatic seizures; Atonic seizures; Drop attacks; Drop seizures; Hypotonic seizure; Hypotonic seizures; Sudden loss of muscle tone
Definition: Atonic seizure is a type of motor seizure characterized by a sudden loss or diminution of muscle tone without apparent preceding myoclonic or tonic event lasting about 1 to 2 seconds, involving head, trunk, jaw, or limb musculature.
Comments:
Reference: HP:0010819
Genes and Diseases: SELECT DISTINCT 'HP:0010819' AS Input, t2.acc as HPO_ID, t2.name as HPO_term, g.Distance, t1.Entrez_gene AS Gene, t1.Entrez_gene_id AS Gene_id_entrez, t1.HGNC_ID, t1.DiseaseId, t1.DiseaseName, t1.Frequency, t1.Onset #, t1.ConceptID, Source, t1.Typical_association , h.Variants AS HGMD_variants, c.variants AS ClinVar_variants FROM hpo202212.graph_path AS g, hpo202212.term AS t, hpo202212.term AS t2 LEFT JOIN hpo202212.hpo_phenotype_to_genes as t1 ON (t1.HPO = t2.acc) LEFT JOIN gb_exome.clinvar_variation_latest_sum AS c ON ( c.Gene = t1.Entrez_Gene) LEFT JOIN gb_exome.hgmd_allmumt_sum_latest AS h ON (h.gene = t1.Entrez_Gene ) WHERE (t.acc ='HP:0010819' AND g.term1_id = t.id AND g.distance <=20 AND t2.id = g.term2_id) order by g.distance, gene, DiseaseName;