Bosma arhinia microphthalmia syndrome
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Bosma arhinia microphthalmia syndrome (BAMS) is a rare condition characterised by abnormalities of the nose and eyes and problems with puberty.
Descrição
Bosma arhinia microphthalmia syndrome (BAMS) is a rare condition characterised by abnormalities of the nose and eyes and problems with puberty.
The key feature of BAMS is arhinia, which is the absence of an external nose. While most people with BAMS are born without a nose, some affected individuals have a severely underdeveloped (hypoplastic) nose. Affected individuals may also be missing the brain structure involved in the sense of smell (olfactory bulb). Because of these abnormalities, people with BAMS have an impaired ability to smell and, consequently, to taste.
In most people with BAMS, the eyeballs are abnormally small (microphthalmia) or absent (anophthalmia), which causes severe vision impairment or blindness. Additional eye abnormalities common in BAMS include a gap or hole in one of several structures of the eye (coloboma) and clouding of the lenses of the eyes (cataracts).
Additional head and face abnormalities that can occur in people with BAMS include a high arch or opening in the roof of the mouth (high-arched or cleft palate), absence of the sinuses behind the nose (paranasal sinuses), blockage of the nasal passages (choanal atresia), narrowing of the tear ducts (nasolacrimal duct stenosis), or a small upper jaw (hypoplastic maxilla). Many of these abnormalities contribute to difficulty breathing, particularly in affected babies. Some affected individuals have abnormal external ears.
Individuals with BAMS also have hypogonadotropic hypogonadism, which is a condition caused by reduced production of hormones that direct sexual development. Without treatment, these hormone problems often result in delayed puberty. Affected males may also have underdeveloped reproductive tissues and undescended testes (cryptorchidism).
Padrões de herança
The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.
Related genes
Other names
Arhinia choanal atresia microphthalmia
Arhinia, choanal atresia, and microphthalmia
Arhinia, choanal atresia, microphthalmia, and hypogonadotropic hypogonadism
BAM syndrome
BAMS
Bosma syndrome
Gifford-Bosma syndrome
Hyposmia-nasal and ocular hypoplasia-hypogonadotropic hypogonadism syndrome
Ruprecht Majewski syndrome
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Leitura adicional e referências
- Bosma arhinia microphthalmia syndrome; MedlinePlus, National Library of Medicine.
- Brasseur B, Martin CM, Cayci Z, Burmeister L, Schimmenti LA. Bosma arhinia microphthalmia syndrome: Clinical report and review of the literature. Am J Med Genet A. 2016 May;170A(5):1302-7. doi: 10.1002/ajmg.a.37572. Epub 2016 Feb 3.
- Gordon CT, Xue S, Yigit G, Filali H, Chen K, Rosin N, Yoshiura KI, Oufadem M, Beck TJ, McGowan R, Magee AC, Altmuller J, Dion C, Thiele H, Gurzau AD, Nurnberg P, Meschede D, Muhlbauer W, Okamoto N, Varghese V, Irving R, Sigaudy S, Williams D, Ahmed SF, Bonnard C, Kong MK, Ratbi I, Fejjal N, Fikri M, Elalaoui SC, Reigstad H, Bole-Feysot C, Nitschke P, Ragge N, Levy N, Tuncbilek G, Teo AS, Cunningham ML, Sefiani A, Kayserili H, Murphy JM, Chatdokmaiprai C, Hillmer AM, Wattanasirichaigoon D, Lyonnet S, Magdinier F, Javed A, Blewitt ME, Amiel J, Wollnik B, Reversade B. De novo mutations in SMCHD1 cause Bosma arhinia microphthalmia syndrome and abrogate nasal development. Nat Genet. 2017 Feb;49(2):249-255. doi: 10.1038/ng.3765. Epub 2017 Jan 9.
- Jansz N, Chen K, Murphy JM, Blewitt ME. The Epigenetic Regulator SMCHD1 in Development and Disease. Trends Genet. 2017 Apr;33(4):233-243. doi: 10.1016/j.tig.2017.01.007. Epub 2017 Feb 20.
- Shaw ND, Brand H, Kupchinsky ZA, Bengani H, Plummer L, Jones TI, Erdin S, Williamson KA, Rainger J, Stortchevoi A, Samocha K, Currall BB, Dunican DS, Collins RL, Willer JR, Lek A, Lek M, Nassan M, Pereira S, Kammin T, Lucente D, Silva A, Seabra CM, Chiang C, An Y, Ansari M, Rainger JK, Joss S, Smith JC, Lippincott MF, Singh SS, Patel N, Jing JW, Law JR, Ferraro N, Verloes A, Rauch A, Steindl K, Zweier M, Scheer I, Sato D, Okamoto N, Jacobsen C, Tryggestad J, Chernausek S, Schimmenti LA, Brasseur B, Cesaretti C, Garcia-Ortiz JE, Buitrago TP, Silva OP, Hoffman JD, Muhlbauer W, Ruprecht KW, Loeys BL, Shino M, Kaindl AM, Cho CH, Morton CC, Meehan RR, van Heyningen V, Liao EC, Balasubramanian R, Hall JE, Seminara SB, Macarthur D, Moore SA, Yoshiura KI, Gusella JF, Marsh JA, Graham JM Jr, Lin AE, Katsanis N, Jones PL, Crowley WF Jr, Davis EE, FitzPatrick DR, Talkowski ME. SMCHD1 mutations associated with a rare muscular dystrophy can also cause isolated arhinia and Bosma arhinia microphthalmia syndrome. Nat Genet. 2017 Feb;49(2):238-248. doi: 10.1038/ng.3743. Epub 2017 Jan 9.
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