8-143726115-G-C

Variant names:

• chr8-143726115-G-C
• rs781902109
• NM_198488.5:c.3346C>G

Variant summary

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

The NM_198488.5(FAM83H):​c.3346C>G​(p.Arg1116Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,458,782 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: FAM83H NM_198488.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.34

Genes affected

FAM83H (HGNC:24797): (family with sequence similarity 83 member H) The protein encoded by this gene plays an important role in the structural development and calcification of tooth enamel. Defects in this gene are a cause of amelogenesis imperfecta type 3 (AI3). [provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM83H	NM_198488.5	c.3346C>G	p.Arg1116Gly	missense_variant	Exon 5 of 5	ENST00000388913.4	NP_940890.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAM83H	ENST00000388913.4	c.3346C>G	p.Arg1116Gly	missense_variant	Exon 5 of 5	5	NM_198488.5	ENSP00000373565.3
FAM83H	ENST00000650760.1	c.3949C>G	p.Arg1317Gly	missense_variant	Exon 5 of 5			ENSP00000499217.1
FAM83H	ENST00000395103.2	n.2524C>G		non_coding_transcript_exon_variant	Exon 1 of 2	2		ENSP00000378535.2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1458782 Hom.: 0 Cov.: 83 AF XY: 0.00 AC XY: 0 AN XY: 725562

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000225

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: 0.00

GnomAD4 genome Cov.: 34

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Sep 30, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3346C>G (p.R1116G) alteration is located in exon 5 (coding exon 4) of the FAM83H gene. This alteration results from a C to G substitution at nucleotide position 3346, causing the arginine (R) at amino acid position 1116 to be replaced by a glycine (G). 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	Uncertain	0.55
BayesDel_addAF	Uncertain	0.029	T
BayesDel_noAF	Benign	-0.20
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.17	T
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.82	D
M_CAP	Benign	0.048	D
MetaRNN	Uncertain	0.67	D
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	1.0	L
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-4.5	D
REVEL	Benign	0.18
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.019	D
Polyphen		1.0	D
Vest4		0.57
MutPred		0.42		Loss of stability (P = 0.0406);
MVP		0.18
MPC		1.1
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.35
gMVP		0.73

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: rs781902109; hg19: chr8-144808285;