Genetic Variant MESP2:p.Pro166Pro (chr15-89776855-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001039958.2(MESP2):c.498C>T(p.Pro166Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000765 in 1,307,078 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P166P) has been classified as Benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.7e-7 ( 0 hom. )

Consequence

MESP2
NM_001039958.2 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.524

Publications

0 publications found

Variant links:

Genes affected

MESP2 (HGNC:29659): (mesoderm posterior bHLH transcription factor 2) This gene encodes a member of the bHLH family of transcription factors and plays a key role in defining the rostrocaudal patterning of somites via interactions with multiple Notch signaling pathways. This gene is expressed in the anterior presomitic mesoderm and is downregulated immediately after the formation of segmented somites. This gene also plays a role in the formation of epithelial somitic mesoderm and cardiac mesoderm. Mutations in the MESP2 gene cause autosomal recessive spondylocostal dystosis 2 (SCD02). [provided by RefSeq, Oct 2008]

MESP2 Gene-Disease associations (from GenCC):

spondylocostal dysostosis 2, autosomal recessive
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
autosomal recessive spondylocostal dysostosis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

MESP2 links:

LOC124903550 (HGNC:):

LOC124903550 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.42).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MESP2	NM_001039958.2 link	c.498C>T	p.Pro166Pro	synonymous_variant	Exon 1 of 2	ENST00000341735.5	NP_001035047.1	Q0VG99
LOC124903550	XR_007064751.1 link	n.-246G>A		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MESP2	ENST00000341735.5 link	c.498C>T	p.Pro166Pro	synonymous_variant	Exon 1 of 2	1	NM_001039958.2	ENSP00000342392.3	Q0VG99
MESP2	ENST00000560219.2 link	c.31-1210C>T		intron_variant	Intron 2 of 2	1		ENSP00000452998.1	H0YKZ5
MESP2	ENST00000558723.1 link	n.39-1210C>T		intron_variant	Intron 1 of 1	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.65e-7

AC:

AN:

1307078

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

638070

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

26846

American (AMR)

AF:

0.00

AC:

AN:

22372

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

18848

East Asian (EAS)

AF:

0.00

AC:

AN:

34266

South Asian (SAS)

AF:

0.00

AC:

AN:

64796

European-Finnish (FIN)

AF:

0.0000274

AC:

AN:

36550

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4284

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1044984

Other (OTH)

AF:

0.00

AC:

AN:

54132

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.42

CADD

Benign

7.1

(source)

DANN

Benign

0.84

PhyloP100

-0.52

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

Computational scores

Splicing

Publications

Other links and lift over