12-48914450-C-A

Variant names:

• chr12-48914450-C-A
• rs563337831
• NM_033124.5:c.347C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_033124.5(DRC2):​c.347C>A​(p.Ala116Asp) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,738 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A116V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DRC2 NM_033124.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.53
• Publications: 0 publications found

Genes affected

DRC2 (HGNC:29937): (coiled-coil domain containing 65) This gene encodes a sperm tail protein that is highly expressed in adult testis, spermatocytes and spermatids. The protein plays a critical role in the assembly of the nexin-dynein regulatory complex. Mutations in this gene result in primary ciliary dyskinesia. [provided by RefSeq, Nov 2013]

DRC2 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 27

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000272822 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033124.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DRC2	NM_033124.5	MANE Select	c.347C>A	p.Ala116Asp	missense	Exon 3 of 8	NP_149115.2	Q8IXS2-1
	DRC2	NM_001286957.2		c.-83C>A		5_prime_UTR	Exon 3 of 8	NP_001273886.1	B4DXQ7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCDC65	ENST00000320516.5	TSL:1 MANE Select	c.347C>A	p.Ala116Asp	missense	Exon 3 of 8	ENSP00000312706.4	Q8IXS2-1
	ENSG00000272822	ENST00000398092.4	TSL:3	c.385-10542G>T		intron	N/A	ENSP00000438507.1	F5H423
	CCDC65	ENST00000266984.9	TSL:5	c.347C>A	p.Ala116Asp	missense	Exon 3 of 9	ENSP00000266984.5	Q8IXS2-2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461738 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 727184

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86236

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53398

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5756

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111926

Other (OTH) AF: 0.00 AC: 0 AN: 60392

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.093	T
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.038	D
MetaRNN	Uncertain	0.65	D
MetaSVM	Benign	-0.83	T
PhyloP100		5.5
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-4.6	D
REVEL	Uncertain	0.32
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0080	D
Polyphen		0.99	D
Vest4		0.91
MutPred		0.33		Gain of catalytic residue at R118 (P = 0.0116)
MVP		0.072
MPC		0.36
ClinPred		0.99	D
GERP RS		4.5
Varity_R		0.84
gMVP		0.44
Mutation Taster		=65/35	polymorphism

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

Other links and lift over

dbSNP: rs563337831; hg19: chr12-49308233;