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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ppharm</journal-id><journal-title-group><journal-title xml:lang="ru">Педиатрическая фармакология</journal-title><trans-title-group xml:lang="en"><trans-title>Pediatric pharmacology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1727-5776</issn><issn pub-type="epub">2500-3089</issn><publisher><publisher-name>Издательство «ПедиатрЪ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.15690/pf.v22i1.2858</article-id><article-id custom-type="elpub" pub-id-type="custom">ppharm-2576</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЙ СЛУЧАЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORT</subject></subj-group></article-categories><title-group><article-title>Гипофосфатемический рахит у пациентов из бихориальной биамниотической двойни: клинический случай</article-title><trans-title-group xml:lang="en"><trans-title>Hypophosphatemic Rickets in Patients from Bichoric Biamniotic Twins: A Case Report</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-7966-9590</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нечаева</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Nechaeva</surname><given-names>Anna S.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Нечаева Анна Сергеевна, ординатор </p><p>117997, Москва, ул. Островитянова, д. 1, стр. 7</p><p>тел.: +7 (963) 676-30-86 </p></bio><bio xml:lang="en"><p>MD</p><p>1, Ostrovityanova Str., building 7, Moscow, 117997 </p></bio><email xlink:type="simple">nechaevolk2099@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-4028-3584</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Григорян</surname><given-names>Э. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Grigoryan</surname><given-names>Emma S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Григорян Эмма Степановна </p><p>Москва </p></bio><bio xml:lang="en"><p>MD</p><p>Moscow </p></bio><email xlink:type="simple">wordemilay@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4955-0121</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Турти</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Turti</surname><given-names>Tatyana V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Турти Татьяна Владимировна, д.м.н., профессор </p><p>Москва </p></bio><bio xml:lang="en"><p>MD, PhD, Professor </p><p>Moscow </p></bio><email xlink:type="simple">turtit@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4680-2925</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Привалова</surname><given-names>Т. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Privalova</surname><given-names>Tatiana E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Привалова Татьяна Евгеньевна, к.м.н.  </p><p>Москва </p></bio><bio xml:lang="en"><p>MD, PhD</p><p>Moscow </p></bio><email xlink:type="simple">privalova-tatyana@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8320-2027</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вашакмадзе</surname><given-names>Н. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Vashakmadze</surname><given-names>Nato D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вашакмадзе Нато Джумберовна, д.м.н., профессор </p><p>Москва </p></bio><bio xml:lang="en"><p>MD, PhD, Professor </p><p>Moscow </p></bio><email xlink:type="simple">nato-nato@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2255-6096</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Краснощекова</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Krasnoshchekova</surname><given-names>Nina A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Краснощекова Нина Александровна </p><p>Москва </p></bio><bio xml:lang="en"><p>MD </p><p>Moscow </p></bio><email xlink:type="simple">dardjin@yandex.ru</email><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>РНИМУ им. Н.И. Пирогова (Пироговский Университет)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pirogov Russian National Research Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>РНИМУ им. Н.И. Пирогова (Пироговский Университет); НИИ педиатрии и охраны здоровья детей НКЦ №2 ФГБНУ «РНЦХ им. акад. Б.В. Петровского»; НИИОЗММ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pirogov Russian National Research Medical University; Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery; Research Institute for Healthcare Organization and Medical Management</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>РНИМУ им. Н.И. Пирогова (Пироговский Университет); НИИ педиатрии и охраны здоровья детей НКЦ №2 ФГБНУ «РНЦХ им. акад. Б.В. Петровского»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pirogov Russian National Research Medical University; Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>МДГКБ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Morozov Children’s City Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>26</day><month>02</month><year>2025</year></pub-date><volume>22</volume><issue>1</issue><elocation-id>31–41</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Нечаева А.С., Григорян Э.С., Турти Т.В., Привалова Т.Е., Вашакмадзе Н.Д., Краснощекова Н.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Нечаева А.С., Григорян Э.С., Турти Т.В., Привалова Т.Е., Вашакмадзе Н.Д., Краснощекова Н.А.</copyright-holder><copyright-holder xml:lang="en">Nechaeva A.S., Grigoryan E.S., Turti T.V., Privalova T.E., Vashakmadze N.D., Krasnoshchekova N.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.pedpharma.ru/jour/article/view/2576">https://www.pedpharma.ru/jour/article/view/2576</self-uri><abstract><p>Обоснование. Х-сцепленный доминантный гипофосфатемический рахит (Х-сцепленная доминантная гипофосфатемия, X-linked hypophosphatemia; XLH) — это заболевание, вызванное мутациями в гене PHEX (расположен в локусе Xp22.1), который кодирует связанный с поверхностью клетки фермент, расщепляющий белок фосфатрегулирующую нейтральную эндопептидазу (PHEX), преимущественно экспрессируемый в остеобластах, остеоцитах и зубах. Это редкое генетическое заболевание, имеющее трудности ранней диагностики, при которой важен мультидисциплинарный подход. В настоящее время разработана новая таргетная терапия, показывающая первые результаты. В данной статье представлен случай семейной Х-сцепленной гипофосфатемии. Описание клинического случая. Девочки из двойни, недоношенные, с низкой массой тела при рождении, имеющие осложнения в периоде новорожденности. В анамнезе жизни отмечались низкая динамика роста, позднее прорезывание зубов, задержка речевого развития, варусная деформация нижних конечностей. В биохимическом анализе крови зарегистрированы повышение уровня щелочной фосфатазы, гипофосфатемия, снижение уровня тубулярной реабсорбции фосфора. На рентгеновских снимках были зафиксированы характерные признаки рахита. В лечении применялись препараты фосфорного буфера, активная форма витамина D. Методом высокопроизводительного параллельного секвенирования по таргетной панели «Наследственные заболевания скелета» проведен анализ 166 генов, ответственных за костную патологию, выявлена мутация в гене PHEX. В возрасте 4 лет 8 мес был установлен клинический диагноз: «Х-сцепленный доминантный гипофосфатемический рахит. Гетерозиготная мутация c.1568+1G&gt;A в гене PHEX. Соматическая низкорослость». Учитывая О-образную деформацию ног, девочкам была проведена корригирующая остеотомия на левую большеберцовую кость. В 6,5 лет — гемиэпифизиодез. С 8 лет начато патогенетическое лечение не зарегистрированным на территории Российской Федерации препаратом моноклональных антител к фактору роста фибробластов 23 — буросумабом. Динамика роста и лабораторных данных на фоне лечения положительная.Заключение. Для улучшения качества жизни пациентов важна своевременная диагностика редких форм рахитоподобных заболеваний.</p></abstract><trans-abstract xml:lang="en"><p>Background. X-linked dominant hypophosphatemic rickets (X-linked hypophosphatemia, XLH) is a disease caused by mutations in the PHEX gene (located at the Xp22.1 locus), which encodes an enzyme bound to the cell surface that cleaves the protein phosphate-regulating neutral endopeptidase PHEX, predominantly expressed in osteoblasts, osteocytes and teeth. This is a rare genetic disease that has difficulties in early diagnosis, in which a multidisciplinary approach is important. Currently, a new targeted therapy has been developed, showing the first results. This article presents a case of familial X-linked hypophosphatemia.Case Report. Twin girls, premature babies, with low birth weight, having complications during the newborn period. There was low growth, late teething, delayed speech development, and varus deformity of the lower extremities in past medical history. A biochemical blood test showed an increase in the level of alkaline phosphatase, hypophosphatemia, and a decrease in the level of tubular phosphorus reabsorption. The characteristic signs of rickets were recorded on the X-rays. Phosphorous buffer preparations, the active form of vitamin D, were used in the treatment. The analysis of 166 genes responsible for bone pathology was carried out using high-performance parallel sequencing using the target panel “Hereditary diseases of the skeleton”, and a mutation in the PHEX gene was identified. At the age of 4 years and 8 months, a clinical diagnosis was established: X-linked dominant hypophosphatemic rickets. Heterozygous mutation c.1568+1G&gt;A in the PHEX gene. Somatic stunting. Taking into account the O-shaped deformity of the legs, the girls underwent corrective osteotomy on the left tibia. At 6.5 years of age, haemiepiphysiodesis. At the age of 8, pathogenetic treatment with the preparation of monoclonal antibodies to fibroblast growth factor-23 — Burosumab, unregistered in the territory of the Russian Federation, was started. The dynamics of growth and laboratory data on the background of treatment is positive. Conclusion. Timely diagnosis of rare forms of rickets-like diseases is important to improve the quality of life of patients.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>клинический случай</kwd><kwd>гипофосфатемический рахит</kwd><kwd>деформации ног</kwd><kwd>фактор роста фибробластов 23</kwd><kwd>PHEX</kwd><kwd>гипофосфатемия</kwd><kwd>гиперфосфатурия</kwd><kwd>буросумаб</kwd></kwd-group><kwd-group xml:lang="en"><kwd>case report</kwd><kwd>hypophosphatemic rickets</kwd><kwd>deformities of the legs</kwd><kwd>fibroblast growth factor-23</kwd><kwd>PHEX</kwd><kwd>hypophosphatemia</kwd><kwd>hyperphosphaturia</kwd><kwd>Burosumab</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Выражаем признательность главному врачу МДГКБ ДЗМ к.м.н. В.В. Гореву, лечащему врачу Н.А. Краснощековой, а также всем специалистам, оказавшим помощь и поддержку в период лечения пациента.</funding-statement><funding-statement xml:lang="en">We express our gratitude to the head physician of the Morozov Children’s City Clinical Hospital Ph.D. of Medical Sciences Valleriy. V. Gorev, the attending physician Nina A. Krasnoshchekova and specialists who provided assistance and support during the patient’s treatment.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Kamenický P, Briot K, Munns CF, Linglart A. X-linked hypophosphataemia. Lancet. 2024;404(10455):887–901. doi: https://doi.org/10.1016/S0140-6736(24)01305-9</mixed-citation><mixed-citation xml:lang="en">Kamenický P, Briot K, Munns CF, Linglart A. X-linked hypophosphataemia. 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