Genetic analysis of non-syndromic peg lateralis using whole-exome sequencing

Area of Science:

• Genetics
• Dental Anomalies
• Human Physiology

Background:

• Peg-shaped lateral incisors (peg lateralis) are a common dental anomaly.
• The genetic underpinnings of non-syndromic peg lateralis are not well understood.
• Identifying causative genes is crucial for understanding developmental mechanisms.

Purpose of the Study:

• To identify candidate genes associated with non-syndromic peg lateralis using whole-exome sequencing (WES).
• To explore the genetic basis of this dental anomaly in individuals without other associated conditions.

Main Methods:

• Whole-exome sequencing (WES) was performed on 20 unrelated Korean individuals with non-syndromic peg lateralis.
• Variant filtering included statistical significance (p<0.05), false discovery rate (<10^-10), and odds ratio (>1).
• In-silico analyses predicted mutation impacts using multiple algorithms.

Main Results:

• A heterozygous allele for RP11-131H24.4 and OTOP1 was identified in all 20 participants.
• OTOP1 encodes the otopetrin-1 protein, a proton channel.
• Gene ontology analysis supported the association of these genes with peg lateralis, and familial segregation was confirmed in three families.

Conclusions:

• The study suggests RP11-131H24.4 and OTOP1 may play a role in the development of non-syndromic peg lateralis.
• These findings provide a foundation for further investigation into the genetic factors contributing to this dental anomaly.
• This research offers novel insights into the genetic etiology of peg lateralis.