Investigation of Genetic Causes in a Developmental Disorder: Oculoauriculovertebral Spectrum

A Brief Analysis on Clinical Severity of Mandibulofacial Dysostosis Guion-Almeida Type

OBJECTIVE

Genetic variants in EFTUD2 were proven to influence variable phenotypic expressivity in mandibulofacial dysostosis Guion-Almeida type (MFDGA) or mandibulofacial dysostosis with microcephaly (MFDM). Yet, the association between the severity of clinical findings with variants within the EFTUD2 gene has not been established. Thus, we aim to elucidate a possible genotype-phenotype correlation in MFDM.

METHODS

Forty articles comprising 156 patients were evaluated. The genotype-phenotype correlation was analyzed using a chi-square or Fisher's exact test.

RESULTS

The proportion of patients with MFDM was higher in Caucasian relative to Asian populations. Although, in general, there was no apparent genotype-phenotype correlation in patients with MFDM, Asians tended to have more severe clinical manifestations than Caucasians. In addition, cardiac abnormality presented in patients with intronic variants located in canonical splice sites was a predisposing factor in affecting MFDM severity.

CONCLUSION

Altogether, this article provides the pathogenic variants observed in EFTUD2 and possible genotype-phenotype relationships in this disease.

Expanding the Etiology of Oculo-Auriculo-Vertebral Spectrum: A Novel Interstitial Microdeletion at 1p36

The etiology of oculo-auriculo-vertebral spectrum (OAVS) is not well established. About half of patients show a positive family history. The etiology of familiar cases is unclear but appears genetically heterogeneous. This motivated us to report a case of OAVS with microtia, ptosis, facial microsomy, and fusion of vertebral bodies associated with a novel genetic etiology, including a deletion at 1p36.12-13. This case report expands on the genetic etiology of OAVS. Furthermore, it also expands the clinical manifestations of patients with interstitial deletions of the de 1p36.12-13 region.

Total Aplasia of Paranasal Sinus Associated With a Syndromic Condition

Total aplasia of paranasal sinus (TAPS) is extremely rare, although the fact that partial aplasia is very common. TAPS seems to be limited to only 5 case reports in the literature until now. We present the case of a 29-year-old patient who has a syndromic face appearance but whose TAPS was detected incidentally. The maxillary, sphenoid, ethmoid, and frontal sinuses were totally aplastic. Furthermore, clinodactyly and high-arched palate were observed. The patient's appearance was consistent with a syndromic face because of some findings on inspection such as hypertelorism, shortening of the palpebral fissure, protruded and wide nasal base, high arched palate and zygomatic hypoplasia. The patient's profile was more suitable for Teacher-Collins syndrome than other syndromes, however, a certain diagnosis was not made genetically. To the best of our knowledge, this is the first reported association between TAPS and a syndromic condition.