PT - JOURNAL ARTICLE AU - R H Thomas AU - C J G Drew AU - S E Wood AU - C L Hammond AU - S K Chung AU - M I Rees TI - Ethnicity can predict <em>GLRA1</em> genotypes in hyperekplexia AID - 10.1136/jnnp-2014-307903 DP - 2015 Mar 01 TA - Journal of Neurology, Neurosurgery &amp; Psychiatry PG - 341--343 VI - 86 IP - 3 4099 - http://jnnp.bmj.com/content/86/3/341.short 4100 - http://jnnp.bmj.com/content/86/3/341.full SO - J Neurol Neurosurg Psychiatry2015 Mar 01; 86 AB - Objectives Hyperekplexia is predominantly caused by mutations in the α-1 subunit of the inhibitory glycine receptor (GLRA1). Three quarters of cases show autosomal-recessive inheritance. Methods We carefully ascertained reports of ethnicity from our hyperekplexia research cohort. These were compared with all published cases of hyperekplexia with an identified genetic cause. Ethnicities were subgrouped as Caucasian, Asian, Arabic, Turkish, Jewish or Afro-American. Results We report the ethnicity of 90 cases: 56 cases from our service augmented by 34 cases from the literature. Homozygous deletions of exons 1 to 7 are predominantly seen in people with Turkish backgrounds (n=16/17, p&lt;0.001). In contrast, the dominant point mutation R271 is seen in people of Asian, Caucasian and African-American heritage (n=19) but not in people with Arab or Turkish ethnicities (p&lt;0.001). Conclusions Self-declared ethnicity can predict gene-screening outcomes. Cultural practices influence the inheritance patterns and a Caucasian founder is postulated for R271 mutations.