Browsing by Author "Beales, PL"
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- Gain-of-function mutations in the phosphatidylserine synthase 1 (PTDSS1) gene cause Lenz-Majewski syndromePublication . Sousa, SB; Jenkins, D; Chanudet, E; Tasseva, G; Ishida, M; Anderson, G; Docker, J; Ryten, M; Sá, J; Saraiva, JM; Barnicoat, A; Scott, R; Calder, A; Wattanasirichaigoon, D; Chrzanowska, K; Simandlová, M; Van Maldergem, L; Stanier, P; Beales, PL; Vance, JE; Moore, GELenz-Majewski syndrome (LMS) is a syndrome of intellectual disability and multiple congenital anomalies that features generalized craniotubular hyperostosis. By using whole-exome sequencing and selecting variants consistent with the predicted dominant de novo etiology of LMS, we identified causative heterozygous missense mutations in PTDSS1, which encodes phosphatidylserine synthase 1 (PSS1). PSS1 is one of two enzymes involved in the production of phosphatidylserine. Phosphatidylserine synthesis was increased in intact fibroblasts from affected individuals, and end-product inhibition of PSS1 by phosphatidylserine was markedly reduced. Therefore, these mutations cause a gain-of-function effect associated with regulatory dysfunction of PSS1. We have identified LMS as the first human disease, to our knowledge, caused by disrupted phosphatidylserine metabolism. Our results point to an unexplored link between phosphatidylserine synthesis and bone metabolism.
- Intellectual disability, coarse face, relative macrocephaly, and cerebellar hypotrophy in two sistersPublication . Sousa, SB; Ramos, F; Garcia, P; Pais, RP; Paiva, C; Beales, PL; Moore, GE; Saraiva, JM; Hennekam, RCWe report on two Portuguese sisters with a very similar phenotype characterized by severe intellectual disability, absent speech, relative macrocephaly, coarse face, cerebellar hypotrophy, and severe ataxia. Additional common features include increased thickness of the cranial vault, delayed dental eruption, talipes equino-varus, clinodactyly, and camptodactyly of the fifth finger. The older sister has retinal dystrophy and the younger sister has short stature. Their parents are consanguineous. We suggest this condition constitutes a previously unreported autosomal recessive entity.
- Intellectual disability, unusual facial morphology and hand anomalies in sibsPublication . Sousa, SB; Venâncio, M; Chanudet, E; Palmer, R; Ramos, L; Beales, PL; Moore, GE; Saraiva, JM; Hennekam, RCHere we report on a Portuguese family with three sisters who shared moderate intellectual disability, unusual facial morphology (short palpebral fissures; broad nasal tip; thin upper and lower vermillion; broad and pointed chin) and hand anomalies in two of them (short left third and fifth right metacarpals in one case; marked syndactyly between the third and fourth fingers in another). One of the sisters had microcephaly and short stature, and the other two were obese. Obesity and somewhat similar facial features were also present in the otherwise healthy mother. Despite the overlap with several known syndromes (Albright osteodystrophy; Filippi syndrome; Rubinstein-Taybi syndrome; microdeletion 2q37), we suggest this condition is previously unreported, and most likely displays an autosomal recessive pattern of inheritance.