Genetic Variant PITX1:p.Ser305Leu (chr5-135028810-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_002653.5(PITX1):c.914C>T(p.Ser305Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,458,200 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. S305S) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

PITX1
NM_002653.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.79

Publications

0 publications found

Variant links:

Genes affected

PITX1 (HGNC:9004): (paired like homeodomain 1) This gene encodes a member of the RIEG/PITX homeobox family, which is in the bicoid class of homeodomain proteins. Members of this family are involved in organ development and left-right asymmetry. This protein acts as a transcriptional regulator involved in basal and hormone-regulated activity of prolactin. [provided by RefSeq, Jul 2008]

PITX1 Gene-Disease associations (from GenCC):

clubfoot
Inheritance: AD Classification: STRONG, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae)
brachydactyly-elbow wrist dysplasia syndrome
Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

PITX1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 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
PITX1	NM_002653.5 link	c.914C>T	p.Ser305Leu	missense_variant	Exon 3 of 3	ENST00000265340.12	NP_002644.4	P78337X5D9A5
PITX1	XM_047417318.1 link	c.1016C>T	p.Ser339Leu	missense_variant	Exon 4 of 4		XP_047273274.1
PITX1	XM_047417319.1 link	c.569C>T	p.Ser190Leu	missense_variant	Exon 3 of 3		XP_047273275.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PITX1	ENST00000265340.12 link	c.914C>T	p.Ser305Leu	missense_variant	Exon 3 of 3	1	NM_002653.5	ENSP00000265340.6		P78337
PITX1	ENST00000506438.5 link	c.914C>T	p.Ser305Leu	missense_variant	Exon 4 of 4	1		ENSP00000427542.1		P78337

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1458200

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

725330

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33408

American (AMR)

AF:

0.00

AC:

AN:

44620

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26074

East Asian (EAS)

AF:

0.00

AC:

AN:

39624

South Asian (SAS)

AF:

0.00

AC:

AN:

86104

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51906

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5304

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111016

Other (OTH)

AF:

0.00

AC:

AN:

60144

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 28, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.914C>T (p.S305L) alteration is located in exon 3 (coding exon 3) of the PITX1 gene. This alteration results from a C to T substitution at nucleotide position 914, causing the serine (S) at amino acid position 305 to be replaced by a leucine (L). 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

Benign

0.21

BayesDel_addAF

Uncertain

0.082

BayesDel_noAF

Benign

-0.12

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.66

D;D

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

.;D

M_CAP

Pathogenic

0.61

MetaRNN

Uncertain

0.48

T;T

MetaSVM

Uncertain

0.38

MutationAssessor

Benign

1.7

L;L

PhyloP100

7.8

PrimateAI

Uncertain

0.70

PROVEAN

Uncertain

-2.4

N;N

REVEL

Uncertain

0.50

Sift

Uncertain

0.0030

D;D

Sift4G

Uncertain

0.0060

D;D

Polyphen

0.67

P;P

Vest4

0.37

MutPred

0.29

Loss of glycosylation at S305 (P = 0.0047);Loss of glycosylation at S305 (P = 0.0047);

MVP

0.86

MPC

1.4

ClinPred

0.95

GERP RS

4.3

Varity_R

0.27

gMVP

0.43

Mutation Taster

=70/30

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over