6-112069548-G-T

Variant names:

• chr6-112069548-G-T
• rs121908900
• NM_198239.2:c.993G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_198239.2(CCN6):​c.993G>T​(p.Trp331Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,440 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CCN6 NM_198239.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.88
• Publications: 0 publications found

Genes affected

CCN6 (HGNC:12771): (cellular communication network factor 6) This gene encodes a member of the WNT1 inducible signaling pathway (WISP) protein subfamily, which belongs to the connective tissue growth factor (CTGF) family. WNT1 is a member of a family of cysteine-rich, glycosylated signaling proteins that mediate diverse developmental processes. The CTGF family members are characterized by four conserved cysteine-rich domains: insulin-like growth factor-binding domain, von Willebrand factor type C module, thrombospondin domain and C-terminal cystine knot-like domain. This gene is overexpressed in colon tumors. It may be downstream in the WNT1 signaling pathway that is relevant to malignant transformation. Mutations of this gene are associated with progressive pseudorheumatoid dysplasia, an autosomal recessive skeletal disorder, indicating that the gene is essential for normal postnatal skeletal growth and cartilage homeostasis. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

CCN6 Gene-Disease associations (from GenCC):

• progressive pseudorheumatoid arthropathy of childhood

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_198239.2
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.908

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198239.2. 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
	CCN6	NM_198239.2	MANE Select	c.993G>T	p.Trp331Cys	missense	Exon 5 of 5	NP_937882.2	A0A384NYW3
	CCN6	NM_003880.4		c.993G>T	p.Trp331Cys	missense	Exon 6 of 6	NP_003871.1	A0A384NYW3
	CCN6	NR_125353.2		n.1311G>T		non_coding_transcript_exon	Exon 6 of 6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCN6	ENST00000368666.7	TSL:1 MANE Select	c.993G>T	p.Trp331Cys	missense	Exon 5 of 5	ENSP00000357655.4	O95389-1
	CCN6	ENST00000613648.1	TSL:1	n.828G>T		non_coding_transcript_exon	Exon 5 of 5
	CCN6	ENST00000620524.3	TSL:1	n.924G>T		non_coding_transcript_exon	Exon 5 of 5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461440 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727040

African (AFR) AF: 0.00 AC: 0 AN: 33446

American (AMR) AF: 0.00 AC: 0 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39614

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111758

Other (OTH) AF: 0.00 AC: 0 AN: 60374

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.76	D
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Pathogenic	0.84	D
MutationAssessor	Pathogenic	3.1	M
PhyloP100		7.9
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-9.5	D
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.85
MutPred		0.62		Gain of catalytic residue at M329 (P = 9e-04)
MVP		0.99
MPC		0.46
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.99
gMVP		0.94
Mutation Taster		=13/87	disease causing

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: rs121908900; hg19: chr6-112390751;