rs104893859

chr4-110618669-C-Gchr4-110618669-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000325.6(PITX2):c.431G>C(p.Arg144Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/20 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R144G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PITX2 NM_000325.6 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.57

Genes affected

PITX2 (HGNC:9005): (paired like homeodomain 2) This gene encodes a member of the RIEG/PITX homeobox family, which is in the bicoid class of homeodomain proteins. The encoded protein acts as a transcription factor and regulates procollagen lysyl hydroxylase gene expression. This protein plays a role in the terminal differentiation of somatotroph and lactotroph cell phenotypes, is involved in the development of the eye, tooth and abdominal organs, and acts as a transcriptional regulator involved in basal and hormone-regulated activity of prolactin. Mutations in this gene are associated with Axenfeld-Rieger syndrome, iridogoniodysgenesis syndrome, and sporadic cases of Peters anomaly. A similar protein in other vertebrates is involved in the determination of left-right asymmetry during development. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_000325.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr4-110618670-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1068355.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.985
• PP5: Variant 4-110618669-C-G is Pathogenic according to our data. Variant chr4-110618669-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 8087.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PITX2	NM_000325.6	c.431G>C	p.Arg144Pro	missense_variant	3/3	ENST00000644743.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PITX2	ENST00000644743.1	c.431G>C	p.Arg144Pro	missense_variant	3/3		NM_000325.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Axenfeld-Rieger syndrome type 1 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Dec 01, 1996	- -
Pathogenic, criteria provided, single submitter	research	Human Developmental Genetics Laboratory, Medical College of Wisconsin	Jun 23, 2022	- -

Inborn genetic diseases Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 13, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
Cadd	Pathogenic	35
Dann	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.97
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Pathogenic	0.66	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.90	D
MutationTaster	Benign	1.0	A;A;A;A;A
PrimateAI	Pathogenic	0.94	D
Polyphen		1.0	D;D;D;D;D;D;D;D;D;.;.
Vest4		0.97, 0.97, 0.95, 0.96, 0.95
MutPred		0.90		.;.;Gain of methylation at K134 (P = 0.0707);Gain of methylation at K134 (P = 0.0707);.;Gain of methylation at K134 (P = 0.0707);Gain of methylation at K134 (P = 0.0707);Gain of methylation at K134 (P = 0.0707);.;Gain of methylation at K134 (P = 0.0707);.;
MVP		0.98
MPC		2.4
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.99
gMVP		1.0

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: rs104893859; hg19: chr4-111539825;