chr14-91234830-A-G

Variant names:

• chr14-91234830-A-G
• rs1057517672
• NM_001177676.2:c.221T>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_003485.3(GPR68):​c.221T>C​(p.Leu74Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GPR68 NM_003485.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.32
• Publications: 4 publications found

Genes affected

GPR68 (HGNC:4519): (G protein-coupled receptor 68) The protein encoded by this gene is a G protein-coupled receptor for sphingosylphosphorylcholine. The encoded protein is a proton-sensing receptor, inactive at pH 7.8 but active at pH 6.8. Mutations in this gene are a cause of amelogenesis imperfecta. [provided by RefSeq, Feb 2017]

GPR68 Gene-Disease associations (from GenCC):

• amelogenesis imperfecta, hypomaturation type, IIa6

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• amelogenesis imperfecta type 2

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.916
• PP5: Variant 14-91234830-A-G is Pathogenic according to our data. Variant chr14-91234830-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 268086.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003485.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GPR68	NM_001177676.2	MANE Select	c.221T>C	p.Leu74Pro	missense	Exon 2 of 2	NP_001171147.1
	GPR68	NM_001348437.1		c.221T>C	p.Leu74Pro	missense	Exon 3 of 3	NP_001335366.1
	GPR68	NM_003485.3		c.221T>C	p.Leu74Pro	missense	Exon 2 of 2	NP_003476.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GPR68	ENST00000650645.1	MANE Select	c.221T>C	p.Leu74Pro	missense	Exon 2 of 2	ENSP00000498702.1
	GPR68	ENST00000531499.2	TSL:1	c.221T>C	p.Leu74Pro	missense	Exon 2 of 2	ENSP00000434045.2
	GPR68	ENST00000535815.5	TSL:1	c.221T>C	p.Leu74Pro	missense	Exon 2 of 2	ENSP00000440797.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460894 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 726732

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44576

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39670

South Asian (SAS) AF: 0.00 AC: 0 AN: 86116

European-Finnish (FIN) AF: 0.0000188 AC: 1 AN: 53248

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111594

Other (OTH) AF: 0.00 AC: 0 AN: 60356

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Amelogenesis imperfecta (1)
1	-	-	Amelogenesis imperfecta, hypomaturation type, IIa6 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.46	T
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.85	D
M_CAP	Pathogenic	0.73	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.52	D
MutationAssessor	Pathogenic	3.8	H
PhyloP100		9.3
PrimateAI	Pathogenic	0.80	T
PROVEAN	Pathogenic	-6.5	D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.94
MutPred		0.73		Gain of catalytic residue at L74 (P = 0)
MVP		0.68
MPC		2.4
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.98
Mutation Taster		=1/99	disease causing (ClinVar)

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: rs1057517672; hg19: chr14-91701174;