12-27963406-C-T

Variant names:

• chr12-27963406-C-T
• NM_198965.2:c.466G>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_198965.2(PTHLH):​c.466G>A​(p.Gly156Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTHLH NM_198965.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.612

Genes affected

PTHLH (HGNC:9607): (parathyroid hormone like hormone) The protein encoded by this gene is a member of the parathyroid hormone family. This hormone, via its receptor, PTHR1, regulates endochondral bone development and epithelial-mesenchymal interactions during the formation of the mammary glands and teeth. It is responsible for most cases of humoral hypercalcemia of malignancy, and mutations in this gene are associated with brachydactyly type E2 (BDE2). Alternatively spliced transcript variants have been found for this gene. There is also evidence for alternative translation initiation from non-AUG (CUG and GUG) start sites, downstream of the initiator AUG codon, resulting in nuclear forms of this hormone. [provided by RefSeq, Nov 2013]

ENSG00000257042 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Parathyroid hormone-related protein (size 140) in uniprot entity PTHR_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_198965.2
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11483577).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTHLH	NM_198965.2	c.466G>A	p.Gly156Arg	missense_variant	Exon 5 of 6	ENST00000545234.6	NP_945316.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTHLH	ENST00000545234.6	c.466G>A	p.Gly156Arg	missense_variant	Exon 5 of 6	5	NM_198965.2	ENSP00000441765.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Dec 03, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 156 of the PTHLH protein (p.Gly156Arg). This variant is not present in population databases (gnomAD no frequency). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with PTHLH-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Benign	-0.051	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	17
DANN	Uncertain	0.99
DEOGEN2	Benign	0.37	T;T;T;.;.;.;.;.
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.47
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.72	T;.;.;T;T;.;.;T
M_CAP	Uncertain	0.088	D
MetaRNN	Benign	0.11	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.44	T
MutationAssessor	Uncertain	2.2	M;M;M;M;M;M;M;.
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-2.2	N;N;N;N;N;N;N;N
REVEL	Benign	0.16
Sift	Benign	0.048	D;D;D;D;D;D;D;T
Sift4G	Uncertain	0.0080	D;D;D;D;D;D;D;D
Polyphen		0.0030	B;B;B;.;.;.;.;.
Vest4		0.17
MutPred		0.29		Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);Gain of solvent accessibility (P = 0.019);
MVP		0.23
MPC		0.79
ClinPred		0.69	D
GERP RS		3.6
Varity_R		0.075
gMVP		0.35

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-28116339;