LRPPRC基因复合杂合突变致French-Canadian型Leigh综合征一例

2020-01-17 刘晓鸣 岳璇 陈娇 中华神经科杂志 神经科病例撷英拾粹

法国-加拿大型Leigh综合征(Leigh syndrome,French-Canadian type,LSFC)是一种罕见的常染色体隐性遗传性严重神经系统疾病,于婴儿期起病。其特点是皮质下脑区存在双侧对称性坏死病灶,通常与全身性细胞色素C氧化酶(COX)缺乏有关。患者通常表现为发育迟缓、张力减退、轻度面部畸形、慢性良性代偿性代谢酸中毒,严重酸中毒发作和昏迷是导致其高病死率的主要原因。2003年,

法国-加拿大型Leigh综合征(Leigh syndrome,French-Canadian type,LSFC)是一种罕见的常染色体隐性遗传性严重神经系统疾病,于婴儿期起病。其特点是皮质下脑区存在双侧对称性坏死病灶,通常与全身性细胞色素C氧化酶(COX)缺乏有关。患者通常表现为发育迟缓、张力减退、轻度面部畸形、慢性良性代偿性代谢酸中毒,严重酸中毒发作和昏迷是导致其高病死率的主要原因。2003年,Mootha等鉴定出LRPPRC基因突变是导致法裔加拿大人发生Leigh综合征的病因。近年来,国外陆续有关于LRPPRC基因突变导致LSFC的研究报道,但是国内的相关报道较少见。现将我们收治的1例经LRPPRC基因检测确诊的LSFC患者报道如下,并分析其临床和基因突变特点。本研究经本院医学伦理委员会批准(伦理批件号:2016-2-15),征得患儿监护人知情同意。

临床资料

患儿,男性,8个月,足月顺产,其母怀孕2次顺产2次,否认患儿异常出生史。其姐6岁,体健。母体健,否认异常孕产史及其他特殊疾病史。否认异常家族史。出生后2个月发现四肢软,5个月始竖头,至今竖头不稳,注视短暂,追视差,目前尚不认人,翻身及独坐不能。于5月龄时在当地康复治疗,主要为高压氧疗、中医按摩及运动疗法,家属自述当地医院头颅CT示“缺氧表现”。2016年9月18日因癫痫发作(发愣伴肢体抖动,数十秒缓解)就诊于我院神经内科。
 
入院体检:体温36.6℃,呼吸30次/min,脉搏112次/min,收缩压/舒张压85/55mmHg(1mmHg=0.133kPa),体重7kg,意识清楚,反应一般,发育落后。头围40cm,额头稍小,毛发正常,前囟平软,皮肤(-),眼外肌麻痹,双眼内斜,心肺未及异常,四肢肌力Ⅳ级,肌张力低,腱反射存在。辅助检查:血常规、肝肾功能、血糖、电解质、血氨、血乳酸(治疗前检测,复查1次仍正常,未行脑脊液乳酸检测)、肌酶及血气均正常,血尿代谢筛查免疫球蛋白及细胞免疫CD系列未见异常。头颅MRI显示:基底节区尾状核头及壳核对称性长T1、长T2异常信号(图1)。动态视频脑电图:未及临床发作,醒睡各期可及多灶性棘慢波散发。脑电诱发电位:在80dB刺激下,双侧各波分化可,双侧III、Ⅴ波潜伏期延长,左右听阈30dB。
 
致病基因筛查:采用安捷伦外显子捕获试剂盒(Agilent Technologies Inc.,美国),结合Illumina Hiseq高通量测序平台(Illumina,美国)共筛查了4000多种致病基因。测序结果发现患儿LRPPRC基因28号外显子区域存在c.2989G>A(rs566932178,Chr2:44145445,GRCh37)突变,37号外显子区域存在c.4078G>A(rs147302249,Chr2:44116923,GRCh37)突变,两个错义突变导致相同的氨基酸改变,即p.Ala997Thr和p.Ala1360Thr。Han等2017年已报道,c.4078G>A错义突变可导致LSFC的发生。c.2989G>A错义突变在Clinvar数据库中未见报道,1000 Genome数据库中正常人群携带率<0.01、ExAC数据库中东亚正常人群携带率低(0.000116),SIFT、Polyphen2、Provean软件预测该突变位点的致病性分别为:致病、可能致病、致病。经Sanger测序家系验证,这两个突变分别来自其父母(图2),构成复合杂合突变,符合常染色体隐性遗传致病的规律。根据美国医学遗传学和基因组学学会(ACMG)遗传变异分类标准与指南,c.2989G>A突变评为可能致病(PM2+PM3+PP3+PP4)。家系验证显示,其姐姐两个位点均未发现突变,为野生型。家系图显示了LRPPRC基因突变在该家系中的突变遗传方式(图3)。







讨论

Leigh综合征病因复杂,既往临床多根据死后神经病理学检查结果确诊,但随着临床经验积累和诊断技术的提高,该综合征的诊断标准不断明确。临床诊断标准主要包含:(1)临床表现出进行性神经系统疾病伴有运动和(或)智力发育迟滞;(2)生化检查:多数病例血、尿、脑脊液中乳酸、丙酮酸明显增高,以脑脊液乳酸、丙酮酸的增高更为显著;(3)影像学检查:多数病例双基底节和(或)脑干对称性长T1、长T2病变;(4)特殊检查:基因检测发现致病突变位点,是疾病诊断的金标准。该综合征临床表现复杂多样,异质性强,需与相关疾病进行鉴别,如线粒体脂肪酸β氧化异常、生物素酶缺乏症、丙酸尿症等,可通过尿有机酸分析、血液酯酰肉碱谱测定、脂肪酸分析、生物素酶测定等区分。另需排除低血钾及Wilson病等其他神经系统疾病。
 
LSFC是Leigh综合征的一种,其患者临床症状取决于受损的中枢神经系统区域,主要临床特征有婴幼儿吸吮能力差、头部失去控制和运动技能丧失,可伴有食欲不振、呕吐、烦躁不安、持续哭闹、精神运动迟滞、发育不良、共济失调、癫痫发作等,脑电图多见棘慢波,随着疾病的发展,可出现全身无力、肌张力低、乳酸性酸中毒,直至导致呼吸和肾功能的损害。本例患儿表现为严重的运动困难(肌张力低、竖头不稳、不能独坐)、精神运动迟滞、认知功能障碍、眼外肌麻痹、面部异常(额头稍小、双眼内斜)、癫痫、脑病变等,与已报道的LSFC患者主要临床特征基本相符。基因检测发现患儿存在LRPPRC基因的c.2989G>A和c.4078G>A复合杂合突变,根据临床表现和文献报道资料,患儿确诊为LRPPRC基因突变导致的LSFC,继续行康复治疗。
 
LSFC首先是在加拿大魁北克省Saguenay-Lac-Saint-Jean地区的儿童患者中报道,近几年在英国白人、英国巴基斯坦人、英国印度人、土耳其人和伊拉克人中陆续有报道。大多数LSFC患者临床均表现出乳酸性酸中毒和脑病,表现出的代谢和(或)神经系统的危象多少,决定了患者的死亡。代谢危象的特点是血清高乳酸、高血糖、低张力、昏迷、肝功能障碍、休克、呼吸窘迫和多器官衰竭。神经系统的危象主要表现为张力减退、共济失调、昏迷、呼吸模式异常、癫痫发作和类中风发作。Han等2015年报道了1例新加坡地区的中国儿童患者(父母非血缘关系),临床表型较温和:7个月大时出现发育迟缓和全身性低张力,体重增加缓慢,有吞咽功能障碍和严重的反流疾病,需要造瘘术喂养;1.5岁时开始出现口面部和肢体运动障碍;3岁时出现难治性多灶性癫痫,脑电图显示局灶性和弥漫性减慢;直至5岁,没有经历过任何严重的代谢危象。基因检测显示,该患儿LRPPRC基因存在c.3130C>T(p.Arg1044Cys)、c.3430C>T(p.Arg1144Cys)和c.4078G>A(p.Ala1360Thr)错义突变。本研究中,患儿8月龄,表现出脑病(基底节区尾状核头及壳核对称性长T1、长T2异常信号),生化检测发现乳酸含量正常,无酸中毒表现,基因检测出1个已报道的LRPPRC基因错义突变c.4078G>A和1个未见报道的错义突变c.2989G>A,根据Leigh综合征的诊断及鉴别标准,该患儿最终确诊为LSFC。方方等2017年对儿童Leigh综合征基因确诊的临床诊断结果进行分析,发现32例行血乳酸测定,23例(72%)升高;11例行脑脊液乳酸测定,8例(73%)升高;头颅磁共振成像(MRI)均累及脑干和(或)基底节区,均经基因检测确诊。因此,婴幼儿表现出神经退行性疾病,LRPPRC基因存在突变,即使在乳酸正常、没有代谢危象的情况下,也应考虑LSFC的可能。
 
LRPPRC基因位于2p21,基因全长109782bp,共有38个外显子,cDNA全长4185bp,编码1395个氨基酸。ClinVar数据库中收录的关于LSFC的LRPPRC基因突变72个(截至2019年1月30日),致病突变6个,可能致病突变38,意义不明突变24个,致病性矛盾的突变4个,致病突变和可能致病突变主要涵盖片段缺失、微小重复、微小缺失、错义突变、剪切位点突变等变异类型。c.1061C>T(Ala354Val)纯合突变是LSFC患者中最常见的突变类型,但患者的存活率和严重程度存在显著差异,这可能与其他遗传和环境因素的影响有关。因此,LRPPRC基因突变对LRPPRC蛋白、不同组织中COX活性的影响,与临床特征的关系,即疾病的表型-基因型相关性还需要进一步研究。
 
目前,对于LSFC没有有效的治疗药物,只能对症治疗。本例患儿家长消极治疗,患儿身体严重不适时,于当地输液治疗,一直服用抗癫痫药物(左乙拉西坦及托吡酯),目前存活,但发育严重落后,仍有癫痫发作,每月数次。该病罕见,我们报道的中国地区婴幼儿患者临床表型和基因型特点,可进一步丰富LSFC的临床表型和LRPPRC基因突变谱。随着对LSFC疾病认识水平的逐渐提高,基因检测结果可有助于早期诊断和遗传咨询,帮助减轻患儿及家庭负担。

原始出处:

刘晓鸣,岳璇,陈娇, 等.LRPPRC基因复合杂合突变致French‐Canadian型Leigh综合征一例[J].中华神经科杂志,2019,52(11):941-944. DOI:10.3760/cma.j.issn.1006‐7876.2019.11.013.

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  3. [GetPortalCommentsPageByObjectIdResponse(id=1639329, encodeId=089e1639329da, content=<a href='/topic/show?id=afda591646' target=_blank style='color:#2F92EE;'>#DIA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5916, encryptionId=afda591646, topicName=DIA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=987022654425, createdName=ms9608593228839890, createdTime=Sat Jul 25 14:06:00 CST 2020, time=2020-07-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1931371, encodeId=148b19313e169, content=<a href='/topic/show?id=e13210802b2' target=_blank style='color:#2F92EE;'>#Leigh综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10802, encryptionId=e13210802b2, topicName=Leigh综合征)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aea0290, createdName=lqvr, createdTime=Mon Jun 08 07:06:00 CST 2020, time=2020-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1633550, encodeId=85af1633550f8, content=<a href='/topic/show?id=377824e1c0' target=_blank style='color:#2F92EE;'>#ANA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2471, encryptionId=377824e1c0, topicName=ANA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=434d22047430, createdName=AspirantSuo, createdTime=Sat Sep 12 21:06:00 CST 2020, time=2020-09-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1431738, encodeId=2a441431e38f2, content=<a href='/topic/show?id=f9b9e9124a8' target=_blank style='color:#2F92EE;'>#综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79124, encryptionId=f9b9e9124a8, topicName=综合征)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1509631, encodeId=3146150963106, content=<a href='/topic/show?id=5b9b1105e07' target=_blank style='color:#2F92EE;'>#LRPPRC基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11057, encryptionId=5b9b1105e07, topicName=LRPPRC基因)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c5b110108407, createdName=ying_wu, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1598501, encodeId=6844159850199, content=<a href='/topic/show?id=829b124e643' target=_blank style='color:#2F92EE;'>#NAD#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12476, encryptionId=829b124e643, topicName=NAD)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=1b0018615070, createdName=pandamao2016, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=)]
    2020-09-12 AspirantSuo
  4. [GetPortalCommentsPageByObjectIdResponse(id=1639329, encodeId=089e1639329da, content=<a href='/topic/show?id=afda591646' target=_blank style='color:#2F92EE;'>#DIA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5916, encryptionId=afda591646, topicName=DIA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=987022654425, createdName=ms9608593228839890, createdTime=Sat Jul 25 14:06:00 CST 2020, time=2020-07-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1931371, encodeId=148b19313e169, content=<a href='/topic/show?id=e13210802b2' target=_blank style='color:#2F92EE;'>#Leigh综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10802, encryptionId=e13210802b2, topicName=Leigh综合征)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aea0290, createdName=lqvr, createdTime=Mon Jun 08 07:06:00 CST 2020, time=2020-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1633550, encodeId=85af1633550f8, content=<a href='/topic/show?id=377824e1c0' target=_blank style='color:#2F92EE;'>#ANA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2471, encryptionId=377824e1c0, topicName=ANA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=434d22047430, createdName=AspirantSuo, createdTime=Sat Sep 12 21:06:00 CST 2020, time=2020-09-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1431738, encodeId=2a441431e38f2, content=<a href='/topic/show?id=f9b9e9124a8' target=_blank style='color:#2F92EE;'>#综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79124, encryptionId=f9b9e9124a8, topicName=综合征)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1509631, encodeId=3146150963106, content=<a href='/topic/show?id=5b9b1105e07' target=_blank style='color:#2F92EE;'>#LRPPRC基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11057, encryptionId=5b9b1105e07, topicName=LRPPRC基因)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c5b110108407, createdName=ying_wu, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1598501, encodeId=6844159850199, content=<a href='/topic/show?id=829b124e643' target=_blank style='color:#2F92EE;'>#NAD#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12476, encryptionId=829b124e643, topicName=NAD)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=1b0018615070, createdName=pandamao2016, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=)]
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  6. [GetPortalCommentsPageByObjectIdResponse(id=1639329, encodeId=089e1639329da, content=<a href='/topic/show?id=afda591646' target=_blank style='color:#2F92EE;'>#DIA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5916, encryptionId=afda591646, topicName=DIA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=987022654425, createdName=ms9608593228839890, createdTime=Sat Jul 25 14:06:00 CST 2020, time=2020-07-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1931371, encodeId=148b19313e169, content=<a href='/topic/show?id=e13210802b2' target=_blank style='color:#2F92EE;'>#Leigh综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10802, encryptionId=e13210802b2, topicName=Leigh综合征)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aea0290, createdName=lqvr, createdTime=Mon Jun 08 07:06:00 CST 2020, time=2020-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1633550, encodeId=85af1633550f8, content=<a href='/topic/show?id=377824e1c0' target=_blank style='color:#2F92EE;'>#ANA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2471, encryptionId=377824e1c0, topicName=ANA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=434d22047430, createdName=AspirantSuo, createdTime=Sat Sep 12 21:06:00 CST 2020, time=2020-09-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1431738, encodeId=2a441431e38f2, content=<a href='/topic/show?id=f9b9e9124a8' target=_blank style='color:#2F92EE;'>#综合征#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79124, encryptionId=f9b9e9124a8, topicName=综合征)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1509631, encodeId=3146150963106, content=<a href='/topic/show?id=5b9b1105e07' target=_blank style='color:#2F92EE;'>#LRPPRC基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11057, encryptionId=5b9b1105e07, topicName=LRPPRC基因)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c5b110108407, createdName=ying_wu, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1598501, encodeId=6844159850199, content=<a href='/topic/show?id=829b124e643' target=_blank style='color:#2F92EE;'>#NAD#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12476, encryptionId=829b124e643, topicName=NAD)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=1b0018615070, createdName=pandamao2016, createdTime=Sun Jan 19 00:06:00 CST 2020, time=2020-01-19, status=1, ipAttribution=)]
    2020-01-19 pandamao2016