ArticleAmerican journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics2011
Familial 6p22.2 duplication associates with mild developmental delay and increased SSADH activity.
Article in American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 5 citations in OpenAlex.
- Succinic semialdehyde dehydrogenase deficiency: exploring the relationship between ALDH5A1 variants and molecular effect on SSADH.Orphanet journal of rare diseases · 2026Article
- De novo Pure Partial Trisomy 6p Associated with Facial Dysmorphism, Developmental Delay, Brain Anomalies, and Primary Congenital Hypothyroidism.Molecular syndromology · 2023Article
- Succinic semialdehyde dehydrogenase deficiency (SSADHD): Pathophysiological complexity and multifactorial trait associations in a rare monogenic disorder of GABA metabolism.Neurochemistry international · 2016Review
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9 authors at 7 institutions in 3 countries.
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Abstract
We present a family with mild developmental delay and a duplication (6)(p22.2). Array CGH analyses revealed this 0.7 Mb duplication in all three patients, spanning candidate genes ALDH5A1, DCDC2, and KIAA0319. Results were confirmed by MLPA analysis of the dyslexia genes DCDC2 and KIAA0319. Of interest, ALDH5A1 encodes succinate semialdehyde dehydrogenase (SSADH), an enzyme responsible for γ-amino-butyric acid (GABA) degradation. Inherited deficiency of SSADH results in accumulation of the neuromodulator γ-hydroxybutyrate (GHB), which likely contributes to some aspects of the neurological phenotype of SSADH deficiency (MIM #271980). Based on autosomal-recessive inheritance, we sequenced ALDH5A1 in all patients, which revealed no pathogenic mutations. SSADH enzyme studies in cultured white cells confirmed elevated SSADH activity, consistent with the duplication, whereas concentrations of SSA were slightly elevated in urine, suggesting oxidant stress. We speculate that the duplication (6)(p22.2) and corresponding hyperactive level of SSADH activity may have negative consequences for GABA metabolism and the role of SSADH in other metabolic sequences.
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