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[Clinical phenotype and genetic analysis of a Chinese pedigree affected with familial progressive hyperpigmentation
Zhongwei Xu1, Zhe Su, Rongfei Zheng
1Department of Endocrinology, Shenzhen Children's Hospital, Shenzhen, Guangdong 518038, China. Su_zhe@126.com.
Insights
Familial progressive hyperpigmentation and hypopigmentation (FPHH) in a Chinese family was linked to a novel KITLG gene variant. This discovery aids in diagnosing infants with progressive skin pigmentation changes.
Area of Science:
- Genetics
- Dermatology
- Molecular Biology
Objective:
To explore the clinical phenotype and genetic basis for a Chinese pedigree affected with familial progressive hyperpigmentation and hypopigmentation (FPHH).
Methods:
Clinical data and family history for a child with FPHH were collected. Peripheral blood samples were collected from the child, his parents and two sisters. Following the extraction of DNA, high-throughput sequencing was carried out to screen for genetic variant associated with the disease. Candidate variant was verified by Sanger sequencing of his family members.
Results:
The main clinical features of the proband have included progressive hyperpigmentation and hypopigmentation. High-throughput sequencing revealed that he has harbored a heterozygous c.105T>A (p.Asn35Lys) variant of the KITLG gene, which was unreported previously. Sanger sequencing confirmed that the variant has co-segregated with the disease phenotype in his pedigree.
Conclusion:
For infants with progressive skin pigmentation and hypopigmentation spots, FPHH should be suspected. The heterozygous c.105T>A (p.Asn35Lys) variant of the KITLG gene probably underlay the FPHH in this pedigree.
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