SMIM1 underlies the Vel blood group and influences red blood cell traits.

SMIM1 underlies the Vel blood group and influences red blood cell traits.
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DOI:
10.1038/ng.2603
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发表时间:
2013-05
期刊:
影响因子:
30.8
通讯作者:
Albers, Cornelis A.
Albers, Cornelis A.
中科院分区:
生物学1区
文献类型:
--
作者:
Cvejic, Ana;Haer-Wigman, Lonneke;Stephens, Jonathan C.;Kostadima, Myrto;Smethurst, Peter A.;Frontini, Mattia;van den Akker, Emile;Bertone, Paul;Bielczyk-Maczynska, Ewa;Farrow, Samantha;Fehrmann, Rudolf S. N.;Gray, Alan;de Haas, Masja;Haver, Vincent G.;Jordan, Gregory;Karjalainen, Juha;Kerstens, Hindrik H. D.;Kiddle, Graham;Lloyd-Jones, Heather;Needs, Malcolm;Poole, Joyce;Soussan, Aicha Ait;Rendon, Augusto;Rieneck, Klaus;Sambrook, Jennifer G.;Schepers, Hein;Sillje, Herman H. W.;Sipos, Botond;Swinkels, Dorine;Tamuri, Asif U.;Verweij, Niek;Watkins, Nicholas A.;Westra, Harm-Jan;Stemple, Derek;Franke, Lude;Soranzo, Nicole;Stunnenberg, Hendrik G.;Goldman, Nick;van der Harst, Pim;van der Schoot, C. Ellen;Ouwehand, Willem H.;Albers, Cornelis A.

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Vel血型在60年前被发现,但其潜在的基因尚不清楚。Vel抗原阴性的个体很少见,需要为具有Vel抗体的患者安全输血。为了确定负责的基因,我们对Vel抗原阴性的5个个体的外显子组进行了测序,发现4个是纯合的,1个是杂合的,用于编码78个氨基酸的跨膜蛋白SMIM 1的基因中的低频17个核苷酸移码缺失。一项后续研究显示,64个Vel阴性个体中有59个是纯合子,在SMIM 1转染细胞上Vel抗原的相同缺失和表达证实SMIM 1是Vel血型的基础基因。作为一个表达数量性状基因座(eQTL),常见的SNP rs 1175550有助于Vel抗原的可变表达(P= 0.003),并影响红细胞(RBC;P= 8.6 × 10−15)的平均血红蛋白浓度。在体内,smim 1敲低的斑马鱼显示出RBC数量的轻度减少,将SMIM 1鉴定为RBC形成的新调节因子。我们的研究结果是直接相关的,因为纯合的缺失允许明确识别Vel阴性献血者。
The blood group Vel was discovered 60 years ago, but the underlying gene is unknown. Individuals negative for the Vel antigen are rare and are required for the safe transfusion of patients with antibodies to Vel. To identify the responsible gene, we sequenced the exomes of five individuals negative for the Vel antigen and found that four were homozygous and one was heterozygous for a low-frequency 17-nucleotide frameshift deletion in the gene encoding the 78-amino-acid transmembrane protein SMIM1. A follow-up study showing that 59 of 64 Vel-negative individuals were homozygous for the same deletion and expression of the Vel antigen onSMIM1-transfected cells confirmSMIM1as the gene underlying the Vel blood group. An expression quantitative trait locus (eQTL), the common SNP rs1175550 contributes to variable expression of the Vel antigen (P= 0.003) and influences the mean hemoglobin concentration of red blood cells (RBCs;P= 8.6 × 10−15).In vivo, zebrafish withsmim1knockdown showed a mild reduction in the number of RBCs, identifying SMIM1 as a new regulator of RBC formation. Our findings are of immediate relevance, as the homozygous presence of the deletion allows the unequivocal identification of Vel-negative blood donors.
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