20-35287005-C-G

Position:

• chr20-35287005-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_178468.6(FAM83C):​c.1774G>C​(p.Gly592Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000048 in 1,457,236 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: FAM83C NM_178468.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0210

Genes affected

FAM83C (HGNC:16121): (family with sequence similarity 83 member C) This gene encodes a member of the family with sequence similarity 83 protein family. The encoded protein may be involved in regulating MAPK signaling in cancer cells. [provided by RefSeq, Mar 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07891163).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FAM83C	NM_178468.6	c.1774G>C	p.Gly592Arg	missense_variant	4/4	ENST00000374408.4	NP_848563.1
FAM83C	XM_047439892.1	c.1246G>C	p.Gly416Arg	missense_variant	4/4		XP_047295848.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FAM83C	ENST00000374408.4	c.1774G>C	p.Gly592Arg	missense_variant	4/4	1	NM_178468.6	ENSP00000363529.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000480 AC: 7 AN: 1457236 Hom.: 0 Cov.: 34 AF XY: 0.00000414 AC XY: 3 AN XY: 725210

Gnomad4 AFR exome AF: 0.000119

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 20, 2024

The c.1774G>C (p.G592R) alteration is located in exon 4 (coding exon 4) of the FAM83C gene. This alteration results from a G to C substitution at nucleotide position 1774, causing the glycine (G) at amino acid position 592 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	8.1
DANN	Benign	0.80
DEOGEN2	Benign	0.016	T
Eigen	Benign	-0.95
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.058	N
LIST_S2	Benign	0.56	T
M_CAP	Benign	0.0079	T
MetaRNN	Benign	0.079	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	M
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.47	N
REVEL	Benign	0.035
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.23	B
Vest4		0.21
MutPred		0.16		Gain of MoRF binding (P = 0.0303);
MVP		0.29
MPC		0.45
ClinPred		0.30	T
GERP RS		0.30
Varity_R		0.12
gMVP		0.16

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: rs2060829228; hg19: chr20-33874808;