19-13913547-G-T

Variant names:

• chr19-13913547-G-T
• NM_017721.5:c.657G>T
• CC2D1A p.Ala219Ala

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_017721.5(CC2D1A):​c.657G>T​(p.Ala219Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. A219A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CC2D1A NM_017721.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.14
• Publications: 0 publications found

Genes affected

CC2D1A (HGNC:30237): (coiled-coil and C2 domain containing 1A) This gene encodes a transcriptional repressor that binds to a conserved 14-bp 5'-repressor element and regulates expression of the 5-hydroxytryptamine (serotonin) receptor 1A gene in neuronal cells. The DNA binding and transcriptional repressor activities of the protein are inhibited by calcium. A mutation in this gene results in a nonsyndromic form of cognitive disability (MRT3). [provided by RefSeq, Jul 2017]

CC2D1A Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• intellectual disability, autosomal recessive 3

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BP7: Synonymous conserved (PhyloP=-2.14 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017721.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CC2D1A	NM_017721.5	MANE Select	c.657G>T	p.Ala219Ala	synonymous	Exon 6 of 29	NP_060191.3
	CC2D1A	NM_001411138.1		c.657G>T	p.Ala219Ala	synonymous	Exon 6 of 29	NP_001398067.1	Q6P1N0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CC2D1A	ENST00000318003.11	TSL:1 MANE Select	c.657G>T	p.Ala219Ala	synonymous	Exon 6 of 29	ENSP00000313601.6	Q6P1N0-1
	CC2D1A	ENST00000589606.5	TSL:1	c.657G>T	p.Ala219Ala	synonymous	Exon 6 of 29	ENSP00000467526.1	Q6P1N0-2
	CC2D1A	ENST00000586955.5	TSL:1	n.192G>T		non_coding_transcript_exon	Exon 2 of 24	ENSP00000465376.1	K7EJY5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	0.037
DANN	Benign	0.51
PhyloP100		-2.1

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr19-14024360;