2-26402090-A-AGCGCATCCAGGCCCG

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_145038.5(DRC1):c.106_120dup(p.Ile36_Arg40dup) variant causes a inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DRC1 NM_145038.5 inframe_insertion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.08

Genes affected

DRC1 (HGNC:24245): (dynein regulatory complex subunit 1) This gene encodes a central component of the nexin-dynein complex (N-DRC), which regulates the assembly of ciliary dynein. Mutations in this gene can cause ciliary dyskinesia. [provided by RefSeq, Aug 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_145038.5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DRC1	NM_145038.5	c.106_120dup	p.Ile36_Arg40dup	inframe_insertion	1/17	ENST00000288710.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DRC1	ENST00000288710.7	c.106_120dup	p.Ile36_Arg40dup	inframe_insertion	1/17	2	NM_145038.5	P1
DRC1	ENST00000421869.5	c.106_120dup	p.Ile36_Arg40dup	inframe_insertion, NMD_transcript_variant	1/8	1
DRC1	ENST00000649059.1	c.92_106dup	p.Ile32_Arg36dup	inframe_insertion, NMD_transcript_variant	1/16

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 19, 2019

Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the affected amino acids is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. This variant has not been reported in the literature in individuals with DRC1-related conditions. This variant is not present in population databases (ExAC no frequency). This variant, c.106_120dup, results in the insertion of 5 amino acids to the DRC1 protein (p.Ile36_Arg40dup) but otherwise preserves the integrity of the reading frame. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1678261374; hg19: chr2-26624958;