2-26401994-A-T

Variant names:

• chr2-26401994-A-T
• NM_145038.5:c.5A>T

Variant summary

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

The NM_145038.5(DRC1):​c.5A>T​(p.Asn2Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DRC1 NM_145038.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.55

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, 0.755

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DRC1	NM_145038.5	c.5A>T	p.Asn2Ile	missense_variant	Exon 1 of 17	ENST00000288710.7	NP_659475.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DRC1	ENST00000288710.7	c.5A>T	p.Asn2Ile	missense_variant	Exon 1 of 17	2	NM_145038.5	ENSP00000288710.2
DRC1	ENST00000421869.5	n.5A>T		non_coding_transcript_exon_variant	Exon 1 of 8	1		ENSP00000414375.1
DRC1	ENST00000649059.1	n.-11A>T		upstream_gene_variant				ENSP00000497543.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Jun 25, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 2171531). This variant has not been reported in the literature in individuals affected with DRC1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 2 of the DRC1 protein (p.Asn2Ile). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.095	T
BayesDel_noAF	Benign	-0.37
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.029	T
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Benign	0.58	T
M_CAP	Benign	0.018	T
MetaRNN	Pathogenic	0.76	D
MetaSVM	Benign	-0.97	T
MutationAssessor	Uncertain	2.3	M
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-2.7	D
REVEL	Benign	0.12
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.99	D
Vest4		0.79
MutPred		0.13		Gain of catalytic residue at L7 (P = 0.0645);
MVP		0.27
MPC		0.38
ClinPred		0.98	D
GERP RS		4.0
Varity_R		0.39
gMVP		0.60

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-26624862;