chr12-27963373-T-C

Position:

• chr12-27963373-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_198965.2(PTHLH):​c.499A>G​(p.Thr167Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PTHLH NM_198965.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.199

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.018199325).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTHLH	NM_198965.2	c.499A>G	p.Thr167Ala	missense_variant	5/6	ENST00000545234.6	NP_945316.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTHLH	ENST00000545234.6	c.499A>G	p.Thr167Ala	missense_variant	5/6	5	NM_198965.2	ENSP00000441765.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000119 AC: 3 AN: 251462 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135912

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000163

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461894 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

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.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 25, 2022

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: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The alanine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 1392444). This variant has not been reported in the literature in individuals affected with PTHLH-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.02%). This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 167 of the PTHLH protein (p.Thr167Ala). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.054
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.54
CADD	Benign	0.56
DANN	Benign	0.74
DEOGEN2	Benign	0.19	T;T;T;.;.;.;.;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.0010	N
LIST_S2	Benign	0.30	T;.;.;T;T;.;.;T
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.018	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	0.035	N;N;N;N;N;N;N;.
PrimateAI	Benign	0.23	T
PROVEAN	Benign	-0.20	N;N;N;N;N;N;N;N
REVEL	Benign	0.20
Sift	Benign	1.0	T;T;T;T;T;T;T;T
Sift4G	Benign	0.96	T;T;T;T;T;T;T;T
Polyphen		0.0	B;B;B;.;.;.;.;.
Vest4		0.065
MutPred		0.11		Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);Loss of glycosylation at T167 (P = 0.0116);
MVP		0.26
MPC		0.64
ClinPred		0.011	T
GERP RS		-0.75
Varity_R		0.025
gMVP		0.13

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: rs1262380417; hg19: chr12-28116306;