2-26402104-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_145038.5(DRC1):c.115C>G(p.Arg39Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,459,836 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R39P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: DRC1 NM_145038.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.41

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.799

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DRC1	NM_145038.5	c.115C>G	p.Arg39Gly	missense_variant	1/17	ENST00000288710.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DRC1	ENST00000288710.7	c.115C>G	p.Arg39Gly	missense_variant	1/17	2	NM_145038.5	P1
DRC1	ENST00000421869.5	c.115C>G	p.Arg39Gly	missense_variant, NMD_transcript_variant	1/8	1
DRC1	ENST00000649059.1	c.103C>G	p.Arg35Gly	missense_variant, NMD_transcript_variant	1/16

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1459836 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 726264

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

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

Feb 18, 2020

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 missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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 sequence change replaces arginine with glycine at codon 39 of the DRC1 protein (p.Arg39Gly). The arginine residue is highly conserved and there is a moderate physicochemical difference between arginine and glycine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.090
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.24	T
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.046	D
MetaRNN	Pathogenic	0.80	D
MetaSVM	Benign	-0.61	T
MutationAssessor	Pathogenic	3.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-5.1	D
REVEL	Benign	0.28
Sift	Uncertain	0.0090	D
Sift4G	Uncertain	0.0060	D
Polyphen		1.0	D
Vest4		0.82
MutPred		0.45		Loss of MoRF binding (P = 0.032);
MVP		0.55
MPC		0.40
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.67
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs778388067; hg19: chr2-26624972;