chr2-43675887-A-T

Position:

• chr2-43675887-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001101330.3(C1GALT1C1L):​c.436T>A​(p.Phe146Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: C1GALT1C1L NM_001101330.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.33

Genes affected

C1GALT1C1L (HGNC:51617): (C1GALT1 specific chaperone 1 like) Predicted to enable glycoprotein-N-acetylgalactosamine 3-beta-galactosyltransferase activity. Predicted to be involved in O-glycan processing, core 1. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

PLEKHH2 (HGNC:30506): (pleckstrin homology, MyTH4 and FERM domain containing H2) Predicted to enable actin binding activity. Predicted to be involved in negative regulation of actin filament depolymerization. Located in several cellular components, including cytosol; lamellipodium; and nuclear body. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.816

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
C1GALT1C1L	NM_001101330.3	c.436T>A	p.Phe146Ile	missense_variant	1/1	ENST00000475092.4
PLEKHH2	NM_172069.4	c.124-2976A>T		intron_variant		ENST00000282406.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
C1GALT1C1L	ENST00000475092.4	c.436T>A	p.Phe146Ile	missense_variant	1/1		NM_001101330.3	P1
PLEKHH2	ENST00000282406.9	c.124-2976A>T		intron_variant		1	NM_172069.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461804 Hom.: 0 Cov.: 41 AF XY: 0.00 AC XY: 0 AN XY: 727186

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

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.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 14, 2021

The c.436T>A (p.F146I) alteration is located in exon 1 (coding exon 1) of the C1GALT1C1L gene. This alteration results from a T to A substitution at nucleotide position 436, causing the phenylalanine (F) at amino acid position 146 to be replaced by an isoleucine (I). 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	Uncertain	0.54
BayesDel_noAF	Benign	-0.62
CADD	Benign	22
DANN	Benign	0.58
DEOGEN2	Benign	0.26	T
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.86	D
MetaRNN	Pathogenic	0.82	D
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.39	T
Sift4G	Pathogenic	0.0	D
Vest4		0.78
GERP RS		0.27
Varity_R		0.15
gMVP		0.77

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: rs1667739219; hg19: chr2-43903026;