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Newborn screening and single nucleotide variation profiling of TSHR, TPO, TG and DUOX2 candidate genes for congenital hypothyroidism

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Abstract

High prevalence of congenital hypothyroidism (CH) among Indian newborns prompted us to establish population-specific reference ranges of TSH and to explore the contribution of the common genetic variants in TSHR, TPO, TG and DUOX2 genes towards CH. A total of 1144 newborns (593 males and 551 females) were screened for CH. SNV profiling (n = 22) spanning three candidate genes, i.e. TSHR, TPO and TG was carried out in confirmed CH cases (n = 45). In screen negative cases (n = 700), ten TSHR variants were explored to establish association with CH. No mutation found in DUOX2. The 2.5th to 97.5th percentiles of TSH in these newborns were 0.5 to 12.2 mU/L. In newborns with optimal birth weight, the cut-off was 10 mU/L. Lower or higher birth weight resulted in slightly higher TSH. Two TSHR variants, i.e. rs7144481 and rs17630128 were associated with agenesis, hypoplasia and goiter. The rs2268477 was associated with agenesis and hypoplasia. The rs1991517, rs2075176 and rs2241119 were associated with agenesis only. The rs7144481, rs17630128, rs1991517 and rs2268477 were associated with 2.17, 4.62, 2.91 and 2.29-fold increased risk for CH, respectively. Among the TPO variants, rs867983 and rs2175977 were associated with agenesis and goiter, respectively. Among the TG variants, rs2076740 showed association with agenesis and goiter. Two rare variants i.e. TPO g.IVS14-19 G>C and TG c.1262 C>T were observed in CH cases. No genetic variant identified in the two exons of DUOX2. To conclude, the current study established Indian population-specific normative values for TSH and demonstrates specific genotype–phenotype correlations among three candidate genes.

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Acknowledgements

Authors specially thank Dr. Pasumarthi NBS Srinivas, Anusha Puvvada, Uma Maheshwar P for their support during the investigation.

Funding

This work was partly supported by a grant from DST-SERB, Government of India (ECR/2016/00304).

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Contributions

VRD, RRDA and SMN designed the work. The work was primarily executed by YK under the supervision of VRD, RRDA and BRG. SMN, DB and MT performed the analysis and interpreted the data. SMN, SN, LL, RKP and BRG gave constructive comments during execution of the work. The manuscript was written by YK and SMN with extensive support of VRD and RRDA. All the authors have given important insights and approved the final version of manuscript.

Corresponding authors

Correspondence to G. Bhanuprakash Reddy or Vijaya R. Dirisala.

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The authors declare that they have no conflict of interest.

Ethical approval

The study was performed in accordance with the ethical standards of the Institutional Ethics committee of Rainbow Hospital Institutional Ethics Committee (RCHBH/066/02-2018), Hyderabad, India and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed written consents were obtained from parents and participants of all subjects included in the study.

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Kollati, Y., Akella, R.R.D., Naushad, S.M. et al. Newborn screening and single nucleotide variation profiling of TSHR, TPO, TG and DUOX2 candidate genes for congenital hypothyroidism. Mol Biol Rep 47, 7467–7475 (2020). https://doi.org/10.1007/s11033-020-05803-x

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